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uniquorn

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Re: MOSAiC news
« Reply #650 on: February 25, 2020, 09:10:31 PM »
A quick look at overall buoy drift for feb1-24. Quite a lot of dropouts recently.
3 cryosphereinnovation simb buoy ice thickness and temperature/pressure data, feb25
« Last Edit: February 25, 2020, 11:22:17 PM by uniquorn »

uniquorn

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Re: MOSAiC news
« Reply #651 on: February 25, 2020, 11:05:40 PM »
KD doesn't appear to be stuck.

A-Team

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Re: MOSAiC news
« Reply #652 on: February 26, 2020, 12:50:44 PM »
Quote
unstuck
Indeed, the variable rate of KD closing on the Polarstern in this morning can be measured (in units of pxls/51 min in the 34 frames of uniq's #651), 72 km to go. Question is, does the KD have enough fuel to get back to Norway a week from now?

If the KD can maintain a speed of 1 knot above the ice pack drift, that would be two days for a rendezvous on Feb 28/Mar 01 to the south and west of the PS's current location at 88.50 41.2 at 07:42 this morning.

Winds are fairly strong right now at 12 m/s. That will complicate or even delay crane unloading for a few days though not personnel swapping. The Polarstern is currently a bit to the right and below the pole hole of Sic-Leads but is drifting into the currently active fracture zone.
« Last Edit: February 26, 2020, 02:41:36 PM by A-Team »

uniquorn

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Re: MOSAiC news
« Reply #653 on: February 26, 2020, 01:34:03 PM »
Drifted quickly past the 45deg line yesterday. Here showing the 3 buoys from oct4-feb26
P207, 2020-02-26T03:00:25,88.4991,40.4124
Deployment line at start
edit: For Tor below, Graticule lines are Lat=0.5deg, Lon=5deg. (otherwise there are too many lines at that resolution. Too lazy to annotate it. Still waiting for someone to post a PS temperature chart.)
« Last Edit: February 26, 2020, 05:12:01 PM by uniquorn »

Tor Bejnar

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Re: MOSAiC news
« Reply #654 on: February 26, 2020, 03:47:05 PM »
Earlier I noted the parallels of latitude in Uniquorn's GIFs had 0.1º spacing.  So is the PS at 98.7ºN or just 33 km from the NP?
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Re: MOSAiC news
« Reply #655 on: February 26, 2020, 04:52:04 PM »
Quote
Is the Polarstern close to the North Pole?
No. It was at 88.5044  41.20 this morning which is as close to the pole as it will ever get, 166.3 km away. To see what happens next, load grid-on nullschool with the lat lon for Polarstern from awiMet and draw radial latitudinal and tangential longitudinal components of wind stress as shown below. The PS will be moving south and west at 3:1 proportions, with longitude losing 0.2º per hour (1.450 km/hr).
Quote
A quick look at overall buoy drift for feb1-24. Quite a lot of dropouts recently.
Using the IABP buoy archive, there appear to be 79 working buoys (reporting on 25-27 Feb) and 31 that have failed (not reported in a  week or more).

The ones closest to the Polarstern can be found by first sorting the attached database for those closest to the ship in longitude, then sorting that subset by latitude which is more important to closeness.

300434063387850   SIMB3       Dart     MOSAiC   88.51   43.31   6.1 km
300234068225020   IT          OSU      MOSAiC   88.51   43.32   6.2 km
300234066081140   Snow_Buoy   AWI      MOSAiC   88.51   43.32   5.8 km
       -+-          -+-       -+-        PS     88.50   41.20
300234068705730   SIMBA       PRIC     MOSAiC   88.50   43.20   5.8 km
300234066081170   Snow_Buoy   AWI      MOSAiC   88.49   33.28  23.1 km
300234068917830   IT          OSU      MOSAiC   88.49   35.43  16.9 km
« Last Edit: February 26, 2020, 06:10:30 PM by A-Team »

uniquorn

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Re: MOSAiC news
« Reply #656 on: February 26, 2020, 05:28:13 PM »
Yes. It's quite a long list. Some report on the hour, some on the half hour, some on both, some every 6hours. One doesn't report for 2 random hours around lunchtime. I think it is French. Thermistor buoys have great temperature data but poor location data at the moment. Both whoi ITP buoy's profilers are dead, probably out of power, though itp102 still reporting location. The SIMB's had datetime ahead of all the others(when I last looked).
p201,p204 and p207 are the nearest, most reliable that report roughly every 30mins. My favourites. :)
Obviously I would prefer a regular accurate location for PS.

echoughton

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Re: MOSAiC news
« Reply #657 on: February 26, 2020, 05:47:07 PM »
Shopped the audiobook! Thanks, guys, for the recommendation!

YOU WILL LOVE IT!!!!

blumenkraft

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Re: MOSAiC news
« Reply #658 on: February 26, 2020, 06:10:11 PM »
I bet, Echoughton! :)
« Last Edit: February 26, 2020, 06:41:15 PM by blumenkraft »
“I’m an introvert. I’m just different that’s all. I’m so sorry. I don’t have a gun. I don’t do that stuff... All I was trying to do was to become better. I’ll do it... You all are phenomenal. You are beautiful. And I love you. Try to forgive me. I’m sorry.”

Elijah McClain

blumenkraft

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Re: MOSAiC news
« Reply #659 on: February 27, 2020, 06:18:52 PM »
From the MOSAIC web app:

Quote
Yesterday morning we had flight weather conditions and took the
chance to fly over to Kapitan Dranitsyn as she was less than 50
miles away. Our helicopter picked up the chief scientist of leg 3
Torsten Kanzow and nautical officer Igor Hering. They are replacing
our leg 2 co-chief scientist Benjamin Rabe and nautical officer Lutz
Peine now. Unfortunately, visibility decreased after that flight and
we had to cancel the exchange of additional people to allow them
to prepare their measurements. But in the meantime, Kapitan
Dranitsyn makes good progress towards the Polarstern and was
only twelve miles away this morning. We hope that they will arrive
at their designated mooring position one kilometer east of the
Polarstern by tomorrow and allow us to start the cargo operations
and handover.
“I’m an introvert. I’m just different that’s all. I’m so sorry. I don’t have a gun. I don’t do that stuff... All I was trying to do was to become better. I’ll do it... You all are phenomenal. You are beautiful. And I love you. Try to forgive me. I’m sorry.”

Elijah McClain

uniquorn

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Re: MOSAiC news
« Reply #660 on: February 28, 2020, 10:36:19 PM »
drift (edit:updated below), some Tbuoys and some dots approaching each other

https://journals.ametsoc.org/doi/pdf/10.1175/JTECH-D-13-00058.1       2013
Quote
This paper describes the development of a novel autonomous platform and sensor that replaces the traditional thermistor strings for monitoring temperature profiles in the ice and snow using a chain of inexpensive digital temperature chip sensors linked by a single-wire data bus. By incorporating a heating element into each sensor, the instrument is capable of resolving material
interfaces (e.g., air–snow and ice–ocean boundaries) even under isothermal conditions. The instrument is small,low cost, and easy to deploy. Field and laboratory tests of the sensor chain demonstrate that the technology can reliably resolve material boundaries to within a few centimeters. The discrimination between different media based on sensor thermal response is weak in some deployments and efforts to optimize the performance continue.
<>
One weakness of the SAMS IMB buoy is the deployment disturbs the snow–ice system. This is particularly true for the snow, which may have poor contact with the chain if the hole is not carefully drilled and refilled. If the ice has positive freeboard, then the top section will be air or snow filled.As the hole refreezes, this air gap will be left but may subsequently fill with snow or flood and refreeze. In summer, the presence of the chain through the snow may cause increased solar energy absorption and speed the melt of the snow. Further tests of the effect of the physical presence of the IMB buoy are warranted.
https://data.meereisportal.de/data/datenportal/bojen/doc/info_Thermistor.pdf
« Last Edit: March 01, 2020, 12:31:11 PM by uniquorn »

Jim Hunt

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Re: MOSAiC news
« Reply #661 on: February 29, 2020, 09:55:35 AM »
Via Stefanie Arndt on Twitter:

Quote
We did it! It is incredible but we finally arrived at RV Polarstern - only 100 nm away from the North Pole - in the middle of Arctic winter.

At 14:17 ships time, we reached our final parking position - with an euphoric applause on the bridge:

Reality is merely an illusion, albeit a very persistent one - Albert Einstein

uniquorn

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Re: MOSAiC news
« Reply #662 on: February 29, 2020, 02:32:17 PM »
drift speed slowing --updated below
« Last Edit: March 01, 2020, 01:10:36 PM by uniquorn »

psymmo7

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Re: MOSAiC news
« Reply #663 on: March 01, 2020, 12:25:07 PM »
Here is an English translation of a transcript of instalment 13 of the Arctic drift podcast posted on the MOSAiC website that is otherwise only available in German.

This time the podcast is almost up to date because it refers to events that happened on the 27th of February, one day before the Dranitsyn managed to reach the Polarstern.  It reveals the problems that have been encountered in  maintaining the emergency  landing strip because of ice movements and that the expedition has probably experienced its closest approach to the Pole. It also includes a contribution from the new expedition leader Torsten Kanzow, who tells listeners something about the mood of his team. 

Installment 13 – Delay of Provisioning Icebreaker, Airstrip kaput and a seal.

Introduction: The next leg of the MOSAiC Expedition is already coming to an end. However, the arrival of the Russian icebreaker Dranitsyn for provisioning and crew exchange has been considerably delayed.  Naturally, most  of the existing scientific projects continue, but there are others that, because the Arctic dawn (return of daylight) is beginning, should be begun as soon as possible. For the third leg of the expedition,  Torsten Kanzow will take over the position of expedition leader on the Polarstern from  Christian Haas.
Commentator: Arctic Drift,  the Audio Logbook.

Christian Haas: Our current position is 88 degrees, 30 minutes North and 39 degrees  48 minutes East. That‘s about 90 miles from the North Pole and the Dranitsyn, the ice breaker with our supplies and exchange crew that we are so eagerly awaiting, is located about 30 miles to the South.[Ed.: According to the data on the MOSAiC webpage, this makes the date of this recording the 27th February]

Commentator: The next leg of the MOSAiC Expedition is already coming to an end. By the half-light of the Arctic dawn (the return of daylight) the crew associated with Christian Haas, the leader of the expedition, is eagerly awaiting the Russian icebreaker Dranitsyn with supplies and exchange crew, whose arrival has be considerably delayed. The delay has consequences for various types of measurements that should already have started. As a result, it’s now important to coordinate the exchange of personnel and materials as quickly as possible to avoid losing any more time.   

Christian Haas: The communication with the Dranitsyn is very difficult, because it is only possible to speak with them via Satellite telephone, where there are big lags in the conversation and the connection is often interrupted, or by E-Mail, where it’s difficult to clarify complicated technical issues quickly and clearly. Anyway, as soon as the weather allows, we are planning to make additional flights to the Dranitsyn to bring more scientists here, in particular to allow them to start the measurements that should be made during the Arctic dawn, that’s just beginning.

Christian Haas: We haven’t just been sitting here doing nothing. Rather, we used the delay period, that‘s now lasted about 2 weeks, to continue and intensify our monitoring. The MOSAiC project is planned to continue for a whole year and therefore it’s important to continue weekly measurements. We’ve done that so the scientific projects are continuing routinely.   

Commentator: After the months-long persistent darkness of the polar night, the Arctic dawn is beginning. Even among experience researchers this natural spectacle evokes fascination and elation.

Christian Haas: We are still thrilled by the environment that surrounds us, and by the moving around and work on the ice. Naturally, that’s become even more fascinating because the sunrise is already beginning. Just today [Ed.: 27th February] for the first time, because the sky was clear, we could really see the ice we were standing on and orient ourselves without using our head lamps. Despite this, many of us on board are of course also still a little incredulous about the situation that our return home will be delayed by so many weeks, which will result in a  lot of organizational and private problems

Commentator: The current monitoring programme will hardly be affected by the delay in exchanging the crews. In fact, just the opposite has happened: in the last few weeks some continuous 24-hour measurements that required a lot of preparation could be carried out.

Christian Haas: In any case, among the recent scientific highlights is the fact that we were in a position to continuously monitor the turbulent flows under the ice for periods longer than 24 hours.  Turbulence measurements are very important for being able to estimate how heat from the ocean can be transferred to the ice and then to the air above the ice.    The strength of the turbulence is dependent on the speed of the current flow and the roughness of the ice. Normally we can only make these measurements during the day and when there is good weather. What does that mean? The wind should be relatively calm and there should be no drifting snow. But these are not conditions under which the current flow is particularly strong and the turbulence correspondingly large. For this reason, we made a special effort to make continuous 24-hour recordings out in the oceanography tent.  Naturally that meant that we also had to ensure safe working conditions 24 hours a day. People had to be on bear watch all the time and shifts had to be organised to make sure that the monitoring was continuous.

Christian Haas: Anyway, a further highlight was that we met the first seal on our ice floe. The first time it was seen was only for a few moments in the ROV tent (the ROV is our underwater robot), but for such a short time that nobody was able to photograph it, so half-jokingly we doubted if the observation was real. Then, just this week, the ROV’s dives took it for long distances under the ice and in its livestream all at once we saw a seal appear, a ringed seal, that we able to observe  catching Arctic cod directly under the ice.    This is a very nice example of how the ice provides a habitat for microorganisms and zooplankton, that are then eaten by fish, in this case arctic cod, of which we see large numbers in our underwater video footage, but have not been able to catch. The fish then serve as a food source for the seals.

Commentator: The specially constructed landing strip that, in emergencies, would allow crew members to be flown out and supplies to be air lifted in was damaged by strong ice movements. Temporarily a new area for it must be found, but for the handover between legs 3 and 4 in April a kilometre-long strip will be required.

Christian Haas: The airstrip was operational for five weeks and in really good condition. But unfortunately, a week ago it was damaged. A split that went the whole way through the floe also went through the middle of the landing strip and divided  it into two parts. However, the crack was less than a metre wide and on the next day we were already able to fill it with snow,  compacted snow, so that planes would have been able to land again.  Sadly, two days after that, because of continuing ice movements, the floe was disrupted again, but this time the crack was much bigger, at least a metre and a half wide, so that one couldn’t just jump over it. To make matters worse, one of our Pistenbullys, these are the vehicles that we use to remove snow, smooth the ice and remove pressure ridges, got stuck on the wrong side of the crack. After several days we were able to bring the Pistenbully back to the ship over the slowly closing crack. But then, there where the crack had been, the ice edges moved together further and the thin ice that had formed in the meanwhile was squeezed out and a pressure ridge formed where the crack had been.   Because the ice there was particularly unstable, we haven’t been able to level the pressure ridge and can’t use this part of the landing strip. But despite the storms of the last few days we are in the process of extending the other part to the North so we will have a new 500 metre long landing strip which, when the cracks to the South have been mended, can be quickly extended to provide one a kilometre long.

Commentator: Despite the demanding work on the ship, the scientists are still able to devote some time to sporting activities that bring them ever closer to the North Pole.

Christian Haas: A special kind of sport on arctic expeditions is that, for fun, one is always trying to get as far north as possible and establish new records. Therefore, we were particularly excited to see how far north we would come and whether we would possibly get to the North Pole. During the last two weeks the drift in a northerly direction was very strong and very  swift, so that we really did approach to within 80 miles of the North Pole. Since then we are now moving southwards and, because we are now in the downstream part of the Polar Drift, it is unlikely that we will reach such a high latitude again. Therefore, we are happy that, in all probability, we got to the northernmost point of the MOSAiC expedition.  Since we were only 80 miles away from the North Pole, we feel that it was justified for us to have called our skiing club the North Pole Skiing club, right from the beginning. And, until we leave the ship, we will continue to make our weekly ski tours and push even further North.

Commentator: Some scientists have already been flown from the Dranitsyn to the Polarstern. Among them is Torsten Kanzow, who will take over the leadership of the expedition from Christian Haas. During the long outward journey, the new personnel has had a chance to grow together as a team and prepare itself for the forthcoming tasks.
 
Torsten Kanzow: I’m Torsten Kanzow. I’m a physical Oceanographer, working at the Alfred Wegener Institute for Polar- and Marine Research and will be taking over the leadership for the third leg of the expedition.

Torsten Kanzow: We have tried very, very hard to come together as a team. Many scientists didn’t know each other before they joined the expedition and they have now got to know each other well and organised themselves to be able to work together. And we have worked an awful lot within the team. Apart from preparing themselves for their individual duties, the scientists have tried to work out different ways for ensuring  effective cooperation between individual groups within the team. In addition, we indulged in an awful lot of free time activities together. We met for communal film evenings, had a table tennis tournament, and quiz evenings. There was frequently a presentation of the best photographs of the day. There were many, many activities, some on deck as well. I believe we used the outward journey and the leg very well to become a team.

Torsten Kanzow:
But on the way here, when the progress through the ice wasn’t so great we went through a roller-coaster of emotions. During the last few days we have been progressing much faster and the mood depended very, very  strongly upon how high we rated the chances that we would be able to reach the Polarstern. From time to time we discussed other alternative possibilities of how we could accomplish our mission, if the Dranitsyn couldn’t get to the Polarstern. So naturally for a long time, and indeed still even today, because the Dranitsyn isn’t there yet, she is still 30 miles distant, we have been holding our breath. [Ed.: in the meantime, the leg3 people can breathe out. The Dranitsyn made it the next day 28. February] But with the good progress that we made during the final part of the trip, its only natural that there are many more happy and hopeful faces to be seen. 

Commentator:
The next thing that must be done is to coordinate the mooring of the two ships so that people and materials can be exchanged. The captain of the  Dranitsyn has received  a comprehensive plan for this.  Torsten Kanzow is very happy about the next leg but also has very high expectations for the next few months.

Torsten Kanzow: On the Dranitsyn we received the plans from Captain Stefan Schwarze, that the mooring of the two ships should be different from the last time.  The mooring position of the Dranitsyn should be about a kilometre away from the Polarstern, to the East. There, as I understand it, there are some sort of infrastructural measures being made to ensure that the transfer of goods from the Dranitsyn to the Polarstern can take place over the ice floe. Naturally we are very happy about this, because it will allow us to kick off with our activities on the ice floe. The third leg can begin or continue activities, because as I have been told it has  now officially started.  Our expectations are very, very  high, in the main because the team seems to me to very motivated and friendly. That’s… That gives me good reason to anticipate that we will be able to achieve a lot, both by carrying on with MOSAiC’s successful projects  and by complementing them through starting new ones. Naturally some of this expectancy is bound up with the fact that we will experience the transition from darkness to 100 percent daylight.  That makes our leg a really, really special one – although of course the other legs were too, in their own way – and that understandably gives this leg  its own powerful allure. Today, on the flight here, we could get our first impression of what we are about to experience: the ascending sun was already producing a red twilit sky and I have to say that it made the flight breath-taking. The helicopter trip today was quite an amazing experience.

Commentator: How successful the changeover from leg 2 to leg 3 will turn out to be and whether the expectations of the new expedition leader Torsten Kanzow will be fulfilled, you can find out by listening to the next instalment of Arctic Drift – the audio logbook.

 

uniquorn

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Re: MOSAiC news
« Reply #664 on: March 01, 2020, 01:32:15 PM »
https://journals.ametsoc.org/doi/pdf/10.1175/JTECH-D-13-00058.1       2013
Quote
5. Heated operation mode
Theory of operation
The novel feature of this new IMB buoy is the development of chains that can be operated in what can be described as either a ‘‘hot-wire anemometer’’ mode or a needle-probe thermal conductivity mode. Hot-wire anemometry is a standard technique in experimental fluid dynamics and has been widely described (e.g., Perry 1982;La Barbara and Vogel 1976). Essentially a temperature-sensing element in a moving fluid is heated to above ambient temperature, and the amount of heat required to maintain a constant sensor temperature is measured. The amount of heat required depends on both the thermal characteristics of the surrounding fluid and its flow velocity. In principle, the output of the Maxim DS28EA00sensor device can be refined for the estimation of both these quantities, thus allowing determination of the position of the ice–air–water interfaces and quantification of flow speeds. The sensitivity of the present design is not yet capable of the quantification of flow speeds
Here looking at T56 heat files in the hope they might offer an easy route to calculating and displaying ice thickness but although there is a 'heat' difference between air, snow, ice and water, it doesn't appear to offer an easy advantage over the standard temperature measurement at 30s. At 120s heating (shown below) the difference is clearer but still requires interpretation. Initial impressions are that HEAT120 indicates that the snow layer may be deeper than that indicated by the temperature gradient change. (Not much in it though)
edit:  t looks like the interfaces between air, snow, ice and water are shifted up the thermistor numbers after 120sec heat, perhaps because heat rises.(Noted that the two frames are not very well aligned)

T56 Last profiles are available here, colour version here
Meereis Tbuoy data here. There is no link to the 120s csv file, change the url from HEAT030 to HEAT120

click to run
« Last Edit: March 01, 2020, 10:28:38 PM by uniquorn »

blumenkraft

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Re: MOSAiC news
« Reply #665 on: March 01, 2020, 02:36:44 PM »
I'm just going ahead calling it.

Fram will spit them out.
“I’m an introvert. I’m just different that’s all. I’m so sorry. I don’t have a gun. I don’t do that stuff... All I was trying to do was to become better. I’ll do it... You all are phenomenal. You are beautiful. And I love you. Try to forgive me. I’m sorry.”

Elijah McClain

blumenkraft

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Re: MOSAiC news
« Reply #666 on: March 01, 2020, 05:37:53 PM »
From the Web App:

Quote
There is light! Together with the Kapitan Dranitsyn the twilight has come to our ice floe. Since two weeks we experienced so-called nautical twilight, and on today's Sunday, there is the onset of civil twilight, when the sun is less than six degrees below the horizon. In civil twilight, it is possible to read outside and to properly see the surface of the snow and ice. This light really makes a difference: We can now see the horizon, which appears surprisingly high. Previously our sights were limited to the Polarstern's searchlights and the spotlights we had installed on the ice, illuminating only a few hundred meters around the vessel. Now our world has become really big and our little MOSAiC floe seems to have shrunk to a small spot in the ice universe.

“I’m an introvert. I’m just different that’s all. I’m so sorry. I don’t have a gun. I don’t do that stuff... All I was trying to do was to become better. I’ll do it... You all are phenomenal. You are beautiful. And I love you. Try to forgive me. I’m sorry.”

Elijah McClain

Stephan

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Re: MOSAiC news
« Reply #667 on: March 01, 2020, 05:42:03 PM »
So, how many days does the crew have to wait for the first real sunrise at their actual position?
It is too late just to be concerned about Climate Change

blumenkraft

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Re: MOSAiC news
« Reply #668 on: March 01, 2020, 06:18:27 PM »
At the moment they are drifting towards the sunlight anyway.  :-\
“I’m an introvert. I’m just different that’s all. I’m so sorry. I don’t have a gun. I don’t do that stuff... All I was trying to do was to become better. I’ll do it... You all are phenomenal. You are beautiful. And I love you. Try to forgive me. I’m sorry.”

Elijah McClain

gerontocrat

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Re: MOSAiC news
« Reply #669 on: March 01, 2020, 07:17:56 PM »
So, how many days does the crew have to wait for the first real sunrise at their actual position?
Between now and the Equinox. Assuming the PolarStern continues to head south to 88 North by the 13th March, then the 13th March is it ( I think)

https://www.esrl.noaa.gov/gmd/grad/solcalc/sunrise.html
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Stephan

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Re: MOSAiC news
« Reply #670 on: March 01, 2020, 08:36:25 PM »
Thank you for your effort, gerontocrat. :)
It is too late just to be concerned about Climate Change

blumenkraft

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Re: MOSAiC news
« Reply #671 on: March 02, 2020, 06:06:35 PM »
From the MOSAIC Blog:

Two New Records at the North Pole

Quote
Despite adverse ice conditions, resupply icebreaker reaches the MOSAiC expedition
[02. March 2020]
For days, fast sea ice had slowed the progress of the resupply icebreaker Kapitan Dranitsyn; bound for the North Pole, her mission was to support the second exchange of researchers and crew in the MOSAiC expedition. Nevertheless, she steadily drew closer to her destination, and finally, at 12:20 pm (CET) on Friday, 28 February, dropped anchor 970 metres from Polarstern, moored to the same floe. While the handover is in full swing on the MOSAiC floe, in Russia another icebreaker will soon leave port in order to supply Kapitan Dranitsyn with additional fuel on her return trip

Read the whole thing here >> https://www.awi.de/en/about-us/service/press/single-view/presse/two-new-records-at-the-north-pole.html
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Niall Dollard

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Re: MOSAiC news
« Reply #672 on: March 02, 2020, 08:47:05 PM »
From the MOSAIC Blog:

For days, fast sea ice had slowed the progress of the resupply icebreaker Kapitan Dranitsyn; bound for the North Pole, her mission was to support the second exchange of researchers and crew in the MOSAiC expedition.


Perhaps it was something lost in translation but I'm wondering what is implied by "fast sea ice" in the above paragraph ?

From NSIDC definition. Fast Ice : "ice that is anchored to the shore or ocean bottom, typically over shallow ocean shelves at continental margins; fast ice is defined by the fact that it does not move with the winds or currents".

The ice is drifting, as illustrated so often in this thread.

Are they referring to the general "pack ice" ?
« Last Edit: March 02, 2020, 10:13:40 PM by Niall Dollard »

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Re: MOSAiC news
« Reply #673 on: March 02, 2020, 08:54:11 PM »
Fast-moving ice would make sense, no?

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Re: MOSAiC news
« Reply #674 on: March 02, 2020, 10:04:52 PM »
Fast-moving ice would make sense, no?

Maybe that is what is meant.  The english term for that would be "drift ice". Fast ice is the opposite ie not moving/drifting. It was probably just an unfortunate choice of words with fast sea ice referring to fast moving as opposed to fast ice ie static !

Fast ice is usually coloured grey on the colour ice charts. Here is a typical one from Norwegian Met.

Fast ice is evident sticking out from the islands of Svalbard and the red is the drift ice.

Reading more of the text, it sounds like it is the ice ridges and hummocks that were causing problems to the ice breaker. (some 20m high).

 
« Last Edit: March 02, 2020, 10:10:05 PM by Niall Dollard »

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Re: MOSAiC news
« Reply #675 on: March 02, 2020, 10:17:16 PM »
Perhaps it was something lost in translation but I'm wondering what is implied by "fast ice" in the above paragraph ?

The original German article says "festes Meereis".  I think what they mean in this context is compact sea ice.

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Re: MOSAiC news
« Reply #676 on: March 02, 2020, 10:20:34 PM »
Now, that makes sense. Thanks, Steven.

Where did you find the German text? Edit: Oh, stupid me! There is a button to change languages on the website!!
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Re: MOSAiC news
« Reply #677 on: March 02, 2020, 11:45:45 PM »
Thanks Steven and BL for clarifying.  :)

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Re: MOSAiC news
« Reply #678 on: March 03, 2020, 06:25:39 AM »
"Dropped anchor" ... how deep is the ocean at the Mosaic site? Four thousand meters?
because a thing is eloquently expressed it should not be taken to be as necessarily true
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Re: MOSAiC news
« Reply #679 on: March 05, 2020, 06:12:40 AM »
Welp, an immense crack developed in the near vicinity.
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Re: MOSAiC news
« Reply #680 on: March 05, 2020, 08:43:07 PM »
Less than 2km distance. PS at the bottom of the scale marker. KD is the white dot casting the radar shadow to the right.

A wider view, https://go.nasa.gov/2TJSpHR  cffr
« Last Edit: March 07, 2020, 07:15:49 PM by uniquorn »

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Re: MOSAiC news
« Reply #681 on: March 09, 2020, 01:37:23 PM »
MOSAiC LEG1 Impressions

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Re: MOSAiC news
« Reply #682 on: March 09, 2020, 01:39:08 PM »
MOSAiC Science lectures - Arctic Ocean Nutrean Biogeochemistry

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Re: MOSAiC news
« Reply #683 on: March 09, 2020, 09:50:31 PM »
Welp, an immense crack developed in the near vicinity.

Today they report on the event on the web app:

Quote
A large lead of more than 5 km length and 500 m width opened north east of Polarstern in a distance of about 1 nautical mile. Leads are very important for the winter Arctic energy balance and biogeochemistry. Hence, 6 scientists from team ATMOS and BGC, set out to scout the way for future instrument deployment and take some samples on the spot. Once we got near the location of the lead, we were stopped by high and rugged ridges. But luckily, a smaller lead had formed just there. In addition to taking snow and ice samples, we also discovered icicles under the blocks of sea ice that had been lifted (see picture). That was an unexpected sampling opportunity to understand the chemical budget of the wintertime Arctic that we could not let pass. A couple of hours later, we saw from the ship radar images that the formerly impressive lead is closing again.
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Re: MOSAiC news
« Reply #684 on: March 10, 2020, 12:49:37 PM »
data for meereis mosaic buoys currently stops at mar5
Maybe it's a handover problem.
https://www.sailwx.info/shiptrack/shipposition.phtml?call=DBLK

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Re: MOSAiC news
« Reply #685 on: March 11, 2020, 06:00:37 PM »
The good people at meereisportal.de have got the buoy updates working again. With the present wind forecast it would be informative to see how the mosaic project begins to approach land. So the buoy animations have to go back to 0°Longitude down to show the Plot Svalbard map. Svalbard/FJL gap bottom right. click to run
« Last Edit: March 11, 2020, 06:34:47 PM by uniquorn »

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Re: MOSAiC news
« Reply #686 on: March 11, 2020, 07:16:09 PM »
A somewhat interesting article about the resupply of the Polarstern (it's the second of two articles on this page):

https://www.nytimes.com/2020/03/11/climate/nyt-climate-newsletter-coronavirus.html

This is the intro from the article:

Here’s the good news: A Russian icebreaker on a voyage to resupply a climate change research expedition barely 100 miles from the North Pole finally reached its destination after struggling through heavy ice for weeks.

Here’s the bad: The ship, Kapitan Dranitsyn, burned so much fuel that now it, too, has to be resupplied. Another icebreaker is on its way to bring it more fuel.

Such are the logistical complexities of the expedition, known as Mosaic, in which a German research ship, Polarstern, has been drifting with the sea ice in the Arctic Ocean since October with a revolving complement of scientists. The ship is expected to come out of the ice east of Greenland in September after gathering a year’s worth of data on conditions in the remote Central Arctic.

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Re: MOSAiC news
« Reply #687 on: March 11, 2020, 07:24:27 PM »
Coronavirus crisis hits ice-locked Arctic research expedition

...

The mission, called MOSAiC, is operating from the German research vessel Polarstern, which has been intentionally frozen in Arctic sea ice since last October. From this ice-encrusted platform, a rotating cast of scientists and technicians are sampling the ice, atmosphere and ocean in an attempt to understand the intricacies of the rapidly changing Arctic climate.

The team member who contracted the virus works on the airborne component of the expedition — a key part that has now been delayed to protect those on board the ship. This part of the mission will use scientific aircraft to take measurements around Polarstern to provide context for those taken at the ship.

About 20 members of the aircraft team are now quarantined in their homes under direction of the German health agencies, says Markus Rex, an atmospheric scientist at the Alfred Wegener Institute for Polar and Marine Research in Bremerhaven, Germany. Rex is the chief scientist of the MOSAiC mission.

...

Close quarters
To minimize the risk of exposure to the coronavirus, all team members who are scheduled to join MOSAiC — which stands for Multidisciplinary Drifting Observatory for the Study of Arctic Climate — are tested for coronavirus before departing their homes for Svalbard, Norway, from where they leave for the ship. There, they are tested a second time before they are allowed to depart. The infected individual had been at a workshop in Bremerhaven on 5 March with other aircraft members; the first round of testing was done as part of this meeting.

https://www.nature.com/articles/d41586-020-00724-y

The headline is a bit misleading but this is another complication.
Þetta minnismerki er til vitnis um að við vitum hvað er að gerast og hvað þarf að gera. Aðeins þú veist hvort við gerðum eitthvað.

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Re: MOSAiC news
« Reply #688 on: March 11, 2020, 11:42:28 PM »
A somewhat interesting article about the resupply of the Polarstern (it's the second of two articles on this page):
.......
Such are the logistical complexities of the expedition, known as Mosaic, in which a German research ship, Polarstern, has been drifting with the sea ice in the Arctic Ocean since October with a revolving complement of scientists.
I'm surprised that this expedition did not plan to be able to go without significant resupply for longer than a few months.
Even the catastrophic final Franklin expedition planned to be able to live fairly well for 3 years and survive for 7 years.

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Re: MOSAiC news
« Reply #689 on: March 12, 2020, 06:05:45 PM »
A closer shear, probably still active. Drift speed from p207 at 0300 quite high at ~1km/hr
« Last Edit: March 12, 2020, 06:21:09 PM by uniquorn »

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Re: MOSAiC news
« Reply #690 on: March 13, 2020, 02:16:20 PM »
Quote
The start of the MOSAiC flight campaign, a scientific aircraft operation, is postponed due to a COVID-19 case. The positively-tested person was a participant of a preparation course in Bremerhaven.

All MOSAiC participants will be tested for corona before departure to minimize the risk of infections on board.

Our virus safety concept, which includes double testing of all participants before the start of any operation, proved to be effective. Other elements of MOSAiC are not affected, the virus has not reached the expedition.

We are closely working with the German Health Agency, which is in charge of defining the details of the quarantine for the affected persons. Also we are closely monitoring the global virus situation and will adapt our safety concept to the evolving situation if needed.

It is our highest priority to (1) prevent importing the virus into the expedition and also (2) to avoid spreading the virus around the globe. This is why we only allow tested people to travel for MOSAiC.

Contrary to misleading media reports, there is no infection onboard Polarstern.

Link >> https://mosaic-expedition.org/update-covid-19-safety-concept/
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Re: MOSAiC news
« Reply #691 on: March 13, 2020, 06:20:35 PM »
From the web app:

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On Wednesday we were once again reminded that we are surrounded by dynamic sea ice. Small cracks appeared around the ship in the morning and widened during the day. In the early evening, these small cracks had developed into leads reaching a width of up to 10 metres. We are extremely lucky that none of the cracks pass directly through any of our research cities. However, part of the floe is now inaccessible. To avoid further damage, the power and data connection for Met City (and also Remote Sensing City) were shut down promptly. With assistance from the helicopter it was possible to access the other side of the lead in order to save precarious scientific equipment from the lead's edge. Fortunately, it was possible to provide power to some of the instruments using external generators. Overnight, the leads stayed open and were filled with new ice and snow. On Thursday, the generators were refueled and the rescue operations of further instruments within Met City continued. Now, we cross our fingers for an improvement in the weather. The stationary low-pressure system above us is producing wind speeds up to 20 m/s - and therefore the movement within and around our ice floe is not yet over. Thus, we exercise further patience until we can return our instruments and continue our measurements on site.
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Re: MOSAiC news
« Reply #692 on: March 16, 2020, 03:18:16 PM »
Via the AWI blog:

MOSAiC aerial survey campaigns for the atmosphere and sea ice temporarily suspended

Quote
On Thursday 12 March, the Norwegian government announced comprehensive measures to combat the spread of the corona virus, effective immediately. As a result, all travellers to Norway from non-Nordic countries who do not have a residence permit will most likely have to immediately leave the country again or be placed in quarantine for 14 days. In response, and due to the highly dynamic development of the corona pandemic, on Friday 13 March the MOSAiC project management decided to temporarily suspend the aerial survey campaigns planned for this spring and based in the Svalbard archipelago, which is under Norwegian administration. There are currently three icebreakers underway in the Central Arctic for the MOSAiC expedition.

Read the whole thing here >> https://www.awi.de/en/about-us/service/press/press-release/mosaic-aerial-survey-campaigns-for-the-atmosphere-and-sea-ice-temporarily-suspended.html
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Re: MOSAiC news
« Reply #693 on: March 16, 2020, 03:26:20 PM »
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Re: MOSAiC news
« Reply #694 on: March 16, 2020, 04:08:37 PM »
As mentioned in the AWI blog post:

Quote
Icebreaker rendezvous in the Arctic ice: The Kapitan Dranitsyn fert the MOSAiC ice floe with the team of leg 2 on 4 March and met Admiral Makarov at 84°48' North and 42°35' East on Saturday, 14 March. This additional icebreaker from Russia had left to supply the Kapitan Dranitsyn with fuel after her long journey through the Arctic ice. Shortly after they had met, the two ships began docking maneuvers. Refuelling takes about 2 to 3 days after which Kapitan Dranitsyn can continue her journey towards Tromso. We expect the team of leg 2 back in Tromso in the second half of March depending On sea ice and weather conditions. The families and colleagues ashore are already looking forward to welcoming the researchers and crew members of leg 2 back home!
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Re: MOSAiC news
« Reply #695 on: March 17, 2020, 08:17:00 PM »
Very large lead opened up on bow radar this morning

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Re: MOSAiC news
« Reply #696 on: March 18, 2020, 08:27:26 AM »
MOSAiC Science lectures - Energy and Radiation Budget of Snow and Sea Ice

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Re: MOSAiC news
« Reply #697 on: March 18, 2020, 11:11:01 AM »
Why The Mosaic Expedition’s Research Is So Vital To Climate Change Research

Link >> https://www.smithsonianmag.com/science-nature/ship-ice-180974335/
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Re: MOSAiC news
« Reply #698 on: March 18, 2020, 12:23:25 PM »
The lead stays open

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Re: MOSAiC news
« Reply #699 on: March 20, 2020, 05:57:07 PM »
If you don't usually visit the MOSAIC web app, do it today.

They have a hi-res aerial image of the floe. You can zoom in.

The fortress is completely in scrambles. :'(

Link >> https://follow.mosaic-expedition.org
“I’m an introvert. I’m just different that’s all. I’m so sorry. I don’t have a gun. I don’t do that stuff... All I was trying to do was to become better. I’ll do it... You all are phenomenal. You are beautiful. And I love you. Try to forgive me. I’m sorry.”

Elijah McClain