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Messages - Stephan

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1
Arctic sea ice / Re: Global sea ice area and extent data
« on: April 21, 2019, 08:43:18 AM »
I compared the actual JAXA extent value (April 20) of Arctic and Antarctic with the decadal averages of the 10s, 00s, 90s, and 80s and calculated the cumulative difference of 2019 (example: in the Arctic we are 14 days ahead compared to the 10s, in the Antarctic we are 11 days behind the 10s average, which sums up to 25 days).
Compared to earlier decades this difference is even bigger:
April 20, 2019 vs. 00s: 35 days
April 20, 2019 vs. 90s: 44 days
April 20, 2019 vs. 80s: 50 days
The big difference means that there is less ice to melt in the Arctic this coming melting season (so less energy needed) and more ice to form in the Antarctic this coming freezing season (more freezing energy to be released). In addition you must also take the Albedo effect into account.
The values are slightly smaller than on April 9 as the slope of the averages increase in May (higher melting rates than in April). But the general trend is unchanged. Climate change is on its way!

2
Antarctica / Re: PIG has calved
« on: April 14, 2019, 08:39:10 PM »
Just for comparison:
This is the latest clear Sentinel image from Feb 20, 2019.
In my opinion the SW crack (the low left one in Sentinel, the right one in Wipneus' post) has grown, widened and lengthened since then. But for a "perfect" comparison the angles of sunlight should be as identical as possible.
With probably no more Sentinel pictures of that area in the coming Austral winter I hope that others will follow this crack, because: If it cracks completely (= calving) it will be the highest ever calving front of PIIS, also exposing the already broken-up western flank of PIIS to open waters with probably even more (minor) calving events to follow.

Big thank you to Wipneus for this wonderful and clear picture.

3
Science / Re: 2019 Mauna Loa CO2 levels
« on: April 12, 2019, 06:27:57 PM »
Week beginning on March 24, 2019:     411.32 ppm
Weekly value from 1 year ago:        409.90 ppm
Weekly value from 10 years ago:     389.31 ppm
At least this week has settled down (+ 1.42 ppm/y), due to some lower daily values (they are very scattered, compared to last years) in that week and a relatively high weekly value one year ago. The following week has been lower last year, so one should expect a higher yearly increase next week...
...and there it is:
Week beginning on March 31, 2019:      412.21 ppm
Weekly value from 1 year ago:        409.15 ppm
Weekly value from 10 years ago:     389.13 ppm

Return to > 3 ppm/year last week.
Last year the next week was around 409.5. The latest values are again more than 3 ppm higher.
How long will this be going on?

4
Antarctica / Re: Thwaites Glacier Discussion
« on: April 07, 2019, 10:21:08 PM »
Weeks of cloudiness in Thwaites area. With Sentinel and EOSDIS - no chance of evaluation what is going on there.
Today the western edge of iceberg B-22-A is visible and I calculated its WNW movement between Feb 4 and Apr 7. It has moved around 3-4 km since then which is in my opinion a sign that it has melted a little bit from below and has lost some of its pinning points.

5
Arctic sea ice / Re: When will the Arctic Go Ice Free?
« on: April 07, 2019, 10:10:41 PM »
It is time for the monthly update of my extrapolation when the extent [Extent], volume [Volumen] and thickness [Dicke] will reach zero. The extrapolation occured linearly and by a logarithmic function; the latter one almost constantly resulting in earlier times. March value now includes 2019.
As extent, volume and thickness in March 2019 lie all above the long-term linear trend lines it is clear that the BOE for March will take place a few years later than calculated last March. All slopes decreased slightly, and March has, together with April, the smallest slope.

Please note that this is not a forecast but a trend!
See attached table.

6
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: April 07, 2019, 09:59:33 PM »
I took the monthly extent value for March and added it into my long-term plot where I calculate the anomalies from 1979 up to now.
The average March extent is now 15,28 M km². March 2019 had an average extent of 14,55 M km², which is (like it was in February 2019) 0,73 M km² less.
In March 2019 the anomaly is 0,33 M km² above the long-term linear trend (it also was above in Nov 18, Dec 18, Jan 19 and Feb 19), which calculated this March should have been at 14,22 M km². With the strong losses in the last week I expect that April 2019 will lie slightly below this linear trend line.

See attached graph.

7
Arctic sea ice / Re: What's new in the Arctic ?
« on: April 07, 2019, 05:22:20 PM »
Another interesting video from the Just Have A Think (JHAT) series:

Main topic is the Blue Ocean Event and its main consequences.
Worth listening to.

8
Arctic sea ice / Re: Global sea ice area and extent data
« on: April 07, 2019, 08:52:21 AM »
I compared the actual JAXA extent value (April 6) of Arctic and Antarctic with the decadal averages of the 10s, 00s, 90s, and 80s and calculated the cumulative difference of 2019 (example: in the Arctic we are 20 days ahead compared to the 10s, in the Antarctic we are 11 days behind the 10s average, which sums up to 31 days, almost a month).
Compared to earlier decades this difference is even bigger:
April 6, 2019 vs. 00s: 42 days
April 6, 2019 vs. 90s: 50 days
April 6, 2019 vs. 80s: 59 days (almost two months)
So there is a big difference as there is less ice to melt in the Arctic this coming melting season (so less energy needed) and more ice to form in the Antarctic this coming freezing season (more freezing energy to be released). In addition you must also take the Albedo effect into account.

9
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: April 05, 2019, 09:06:19 AM »
The top losers of sea ice area (see gerontocrat's posting above) from March 20-April 3 are Okhotsk, Barents, Bering and Kara Seas. In relative numbers the decrease in sea ice area is highest in Bering, followed by St. Lawrence and Barents. Almost no change still in the central Arctic seas such as CAA, CAB and ESS.

10
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: April 03, 2019, 08:37:26 AM »
2019 is now six days ahead (8.4.2016 had the same extent as 2.4.2019) and further extent losses are likely.

11
Science / Re: 2019 Mauna Loa CO2 levels
« on: April 02, 2019, 10:21:36 PM »
Week beginning on March 24, 2019:     411.32 ppm
Weekly value from 1 year ago:       409.90 ppm
Weekly value from 10 years ago:     389.31 ppm
At least this week has settled down (+ 1.42 ppm/y), due to some lower daily values (they are very scattered, compared to last years) in that week and a relatively high weekly value one year ago. The following week has been lower last year, so one should expect a higher yearly increase next week...

12
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: April 01, 2019, 08:42:08 AM »
If there were no further drop in the next days (what I do not expect), 2019 will keep the record low position at least until April 5.

13
Antarctica / Re: PIG has calved
« on: March 19, 2019, 06:39:13 PM »
I can report about a little calving event (ca. 2 * 1 km) on the central front of PIIS, marked in brown.
Unfortunately the actual Sentinel picture (March 18) is so cloudy that I cannot use it for demonstration purposes. So I decided to take the last clear picture (March 2) of PIIS and marked the position of ice that was lost during the last days.
The gap south of the calving front has not widened the last weeks, so the speed of both parts must be roughly the same.
See attached picture.

14
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: March 17, 2019, 08:54:28 PM »
I think it is time to thank gerontocat and Juan for presenting up-to-date tables, statistics and information which were almost delivered daily (on some days Juan would have posted the data but he couldn't due to a JAXA timeout).
You two have contributed much valuable information. Please keep up your good work :-)

15
Arctic sea ice / Re: What's new in the Arctic ?
« on: March 16, 2019, 08:27:00 PM »
Just found this basic information about Arctic Sea Ice changes since 1980s on YouTube . The channel's name is "Just have a Think". The author will put more videos like this online over the next weeks. They are based on the latest Arctic Report Card subjects.

16
Antarctica / Re: PIG has calved
« on: March 10, 2019, 09:09:34 PM »
Finally a new Sentinel Picture from March 02 is available. Unfortunately it is not as clear as the 20 Feb or 01 Jan picture. Nevertheless I took the chance to compare it with previous ones.
Main findings:
1. The Pine Island Ice Shelf continues its WNW movement, the SW Tributary moves northward
2. The cracks are almost the same as on Feb 20 or Jan 21.
3. New little cracks are highlighted in yellow.
4. A minor calving has taken place at the merger of PIIS and the SW tributary. The area lost was about 0.3 x 0.1 km, not much of a deal (circled in red)
I took several features and measured their movement. The speed differs from place to place. I calculated them (March 2 minus Dec 28 to have a longer time distance) and wrote them into the picture. Unfortunately the central and eastern part does not present useful features which can be followed easily, therefore there is no data in that region.

See attached picture.

17
Arctic sea ice / Re: When will the Arctic Go Ice Free?
« on: March 05, 2019, 10:22:45 PM »
It is time for the monthly update of my extrapolation when the extent [Extent], volume [Volumen] and thickness [Dicke] will reach zero. The extrapolation occured linearly and by a logarithmic function; the latter one almost constantly resulting in earlier times. February value now includes 2019.
As extent, volume and thickness in February 2019 lie above the long-term trend lines it is clear that the BOE for February will take place a few years later than calculated last February. All slopes decreased slightly.

Please note that this is not a forecast but a trend!
See attached table.

18
Antarctica / Re: Thwaites Glacier Discussion
« on: March 03, 2019, 09:14:46 PM »
As for the Pine Island Bay (see my posting in that thread) also the Thwaites area was completely clear today which offered an analysis of the EOSDIS picture.
The limit between ice shelf and ice mélange is roughly indicated by the orange line. The distance to the calving front is now < 10 km. Its continuation to NNW (in blue) shows the same "crack" I reported about two weeks ago. It also seems to be the boundary between ice shelf/fast ice and the more moblie ice mélange NE of it.
Iceberg B-22-A has moved very slowly west-/northwestward (compared to its position on Feb. 04). And it has lost small pieces off its western shore (not on the picture). Many of the icebergs lost there stay in that area and seem to be grounded.
Another bigger grounded iceberg N of the tip of Thwaites Ice Tongue is circled in pale magenta. Imo these grounded bergs can cause floating sea ice to be stopped and help the formation of new sea ice/fast ice in the next freezing season around them.
The "outer ice field" has completely disintegrated, but the melting season is probably over, so that a melt-out of the sea ice between the icebergs will not take place anymore.
The green line differs between very slowly (or not moving at all) moving ice of the Thwaites Ice Tongue E of it and the area of faster movement of the many icebergs that Thwaites glacier endlessly produces (W of this line).
Comparing Thwaites and Pope the latter is much slower moving (a month difference almost does not show a change of position of individual features).

See attached picture

19
Antarctica / Re: PIG has calved
« on: March 03, 2019, 08:27:30 PM »
The clean-up of Pine Island Bay from fast sea ice continues. After about two weeks of cloudiness EOSDIS offered a very clear view on Pine Island Bay.
I marked the missing (comparison with Feb. 04, 2019) areas of fast sea ice in red.
Please also note the big "crack" at the eastern shore of Thwaites Ice tongue. It is no crack, it is just the gap between the ice tongue and the sea ice/iceberg mélange that was pushed towards the ice tongue the last days.
The "green" iceberg in the centre is the biggest remain of the last calving event (Oct 2018). It has moved slightly inland the last days and rotated by around 300° compared to a month ago.
I wonder whether "this will be it" for this melting season, we're approaching equinox in a few weeks.

See attached picture.

20
Antarctica / Re: Thwaites Glacier Discussion
« on: March 03, 2019, 09:10:25 AM »
Thank you very much for this linked video.
It is intersting to see that the ice in the upper left corner is so slowly moving compared to the Thwaites iteself.

21
Antarctica / Re: PIG has calved
« on: February 21, 2019, 07:11:58 PM »
I analysed the cracks on PIIS on Feb 20 and compared them with Feb 06, 2019.
Some cracks have relevantly widened (marked in dark red), one has grown longer (marked in orange) and a new very thin crack appeared very close to the calving front (marked in yellowish green). [Edit: I just discovered a new thin crack, also marked in yellowish green, which is roughly the continuation of the bigger crack in the centre of the image (marked in blue) and N of the four short parallel cracks mentioned two postings above (circled in pale magenta)]
See attached picture.

22
Antarctica / The Ross Ice Shelf Thread
« on: February 17, 2019, 09:04:01 PM »
I just wondered that the largest Antarctic Ice Shelf - the Ross Ice Shelf - does not have its own thread. You can see it constantly growing, almost no cracks at its northern edge, apart from two or three seemingly elder ones. And so it didn't show larger calving events for many years or even decades.
Yesterday the northeasternmost corner of it showed a minor calving, an area of around 10 x 2 km broke off, in an area already full of cracks, see attached picture.

23
Antarctica / Re: PIG has calved
« on: February 17, 2019, 12:02:11 PM »
A new Sentinel picture of PIIS is available. I checked the actual rifts and didn't find any relevant lengthening or widening. Only a very little calving must have taken place this week (500m x 150m of ice is missing) close to the junction of PIIS and the SW tributary glacier at the same place where another calving event took place two weeks earlier.
I looked at three different features of PIIS and compared their NW-ward drift between Jan 27 and Feb 16 (=20 days). The movement of the ice was 272m, 263m and 270m, respectively, which results in a speed of ~13-14 m/day, which is in the upper range of what has been calculated earlier.

The small rift in the SW tributary has moved north by about 36 m in the same time, which shows a much smaller speed (ca. 2 m/day).

25
Antarctica / Re: PIG has calved
« on: February 12, 2019, 08:13:03 PM »
The "clean up" of the fast ice in Pine Island Bay continues even faster. Today a ca. 350km² area in the northeastern part of the Bay was cleared from ice, in addition a lot of the northeastern coast. Also the SW side of the bay lost further fast sea ice. All these areas are marked in red. The big yellowish green marked feature in the center is the biggest remaining iceberg from the calving event in October 2018. Some of the freshly eroded fast ice was pushed against the eastern margin of the Thwaites Ice Tongue (marked in blue).
See attached picture.

26
Antarctica / Re: PIG has calved
« on: February 11, 2019, 08:54:49 PM »
"Clean Up" of fast sea ice in Pine Island Bay.
All red marked areas have lost fast sea ice in the last week/during the last weekend.
The areas are marked in red at the PIIS show minor calvings (see more details above in this thread). The blue marked iceberg is grounded and is located at the same place for quite a while now. I tried to indicate some names of islands and glaciers for a better orientation. The whole area contains ca. 320 x 175 km, so it is huge.
See attached graph

PS: In Sentinel some of the edges close to the slow, not really moving ice shelves show the first re-freezing.

27
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: February 11, 2019, 08:02:14 PM »
Stephan - can you show a graph with only the January averages for each year? I wonder if it will show a different trend.
Here it is, please note that the slope is only 60% of that of all calendar months:

28
Arctic sea ice / Re: When will the Arctic Go Ice Free?
« on: February 10, 2019, 10:14:10 PM »
It is time for the monthly update of my extrapolation when the extent [Extent], volume [Volumen] and thickness [Dicke] will reach zero. The extrapolation occured linearly and by a logarithmic function; the latter one almost constantly resulting in earlier times. Volume is the first to reach zero.
Due to long unavailable data for December I present Dec 1979-2018 and Jan 1979-2019 in one new post.
As both months lay above the long term linear trend (see my posting today on the sea ice area and extent data) the slopes have decreased very slightly, leading to slightly later values compared to the two months one year ago.
Please note that this is not a forecast but a trend!
See attached table.

29
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: February 10, 2019, 09:53:17 PM »
Another month - and this time also another 5-year period - has passed and I provide the actual January extent data in the bigger context.
Jan 2019 had an average extent of 13.56 M km², 0.6 M km² less than all Januarys since 1979. Nevertheless the loss does not follow the linear trend line, but remains 0.3 M km² above it (red line in the graph). It is the third consecutive month with that behaviour, and I guess at least the next two months will show the same deviation.
See attached graph (if you compare it with the Dec 2018 graph you see I had to lengthen the x axis by another five years).

30
Antarctica / Re: Thwaites Glacier Discussion
« on: February 09, 2019, 10:04:19 PM »
New development at the fast ice east of Bear Peninsula and South of Iceberg B-25 B-22-A.
In-between the coloured lines (I used the same colours as in Reply #49 earlier in this thread) there are hundreds of cracks. So one might expect a further degradation and dis-integration of the fast ice.
But summer is fading rapidly and some features already show a thin ice cover, for example parts of the pale magenta coloured crack, or the blue circled area close to the open ocean.
So the late austral summer may prevent the fast ice from a complete collapse.
See attached picture.

31
Antarctica / Re: Thwaites Glacier Discussion
« on: February 09, 2019, 09:40:59 PM »
I carefully compared Thwaites Glacier cracks Dec 15, 2018 with Feb 09, 2019. A new one, around 15 km long, has formed within the last 8 weeks.
See attached figure.
I indicated some of the features so you have a better orientation. Thanks Bernard for letting us know that we should give some additional information, where exactly all these things are going on...

32
Antarctica / Re: PIG has calved
« on: February 07, 2019, 06:42:23 PM »
A new crack has developed in the last two weeks on one of the icebergs at the western flank of PIIS. It has a length of roughly 1.2 km and almost reached the eastern side of this iceberg.
See attached figure, crack marked in yellowish green.
I wonder what happens when the calving front reaches this area of already broken-up ice at the western flank of PIIS. Will this accelerate the degradation in general and lead to more little calving events?

33
Antarctica / Re: PIG has calved
« on: February 07, 2019, 05:49:51 PM »
Please compare this picture with my reply #916. The cracks were already visible at that time. I checked their length and width on Sentinel on Feb 06 with mid-January photos and they didn't change. So for a sudden calving cracks do not necessarily need to widen and lengthen beforehand...

34
Antarctica / Re: PIG has calved
« on: February 06, 2019, 10:12:45 PM »
Minor break-up of fast sea ice on the NE shore of Pine Island bay. Total are is about 15 x 2-3 km². Mostly it is young thin ice, but two packs derived from the ice shelf (marked in blue) have also disintegrated. In addition new and older cracks in that shelf are marked in orange. Probably future breaks, possibly this austral summer?
See attached figure.

35
Antarctica / Re: PIG has calved
« on: February 06, 2019, 10:05:00 PM »
Minor calving at the SW end of the PIIS, an area already designed to calve because of many cracks with the approx. size of 3 x 0,5 km has calved this week.
See attached picture.

36
Antarctica / Re: PIG has calved
« on: February 01, 2019, 07:36:47 PM »
No problem, you're welcome   :)

37
Antarctica / Re: PIG has calved
« on: February 01, 2019, 06:27:31 PM »
This has been posted before in the Thwaites Glacier thread - Neven, could you remove this posting into the right thread? Thanks.

38
Antarctica / Re: Thwaites Glacier Discussion
« on: January 30, 2019, 07:00:20 PM »
New melting and breaking off at Thwaites Glacier. Today I analysed the outer ice field which continues Thwaites Ice tongue to the northwest. I compared the EOSDIS data from Jan 12 and Jan 30, 2019. I marked lost fast sea ice positions in pale magenta and newly formed cracks in orange. I wonder whether this outer ice field, which now has almost completely lost its connection to the Thwaites Ice tongue, will survive this fading austral summer.
See attached picture.

39
Antarctica / Re: Thwaites Glacier Discussion
« on: January 28, 2019, 06:37:41 PM »
In addition to the posting I have just made and in addition to my post from yesterday I have to report that a further new crack in the fast ice / ice mélange of Thwaites has developed yesterday.
See attached image.
Colour code: orange is the crack I have just mentioned, yellowish green is the crack I reported of yesterday and the new crack which connects both cracks is painted in pale magenta.
It seems that the whole thing is about to collapse.

40
Antarctica / Re: Thwaites Glacier Discussion
« on: January 28, 2019, 05:59:41 PM »
New big movement in the Thwaites fast ice / ice tongue / ice mélange (call it what you like). This time it goes further than any time this austral summer (orange line) and comes close to the calving front of Thwaites glacier (approx. 20-30 km). I also marked with a thin dotted yellowish green the position of the crack I posted yesterday (please note that Sentinel and EOSDIS use different orientations).
See attached image.

41
Antarctica / Re: Thwaites Glacier Discussion
« on: January 27, 2019, 09:14:32 PM »
There is a new big crack going through the fast ice of the Thwaites Ice Tongue that separates Thwaites glacier (to the south) and thicker ice originated from Thwaites Glacier (to the north). I checked Sentinel images from earlier January and late December and the crack was only very partially visible at that time. The crack goes through the thinner sea ice, not through any of the bergs.
I wonder whether the whole thong can separate due to currents and winds in the next days or weeks or whether the northern part will stay where it is because it is grounded in shallow waters. Any idea?
See attached figure, crack again indicated by yellowish green line (the thicker parts of it south of the crack so you can directly see it). The thicker the line, the wider the crack.

42
ASLR,

I just want to "join" Shared Humanity in saying that your contributions in this thread are very valuable and necessary. I thank you for your daily effort of informing us about the latest results of peer-reviewed science.

Stephan

43
Antarctica / Re: Thwaites Glacier Discussion
« on: January 25, 2019, 06:24:03 PM »
A new crack runs through the Thwaites Ice tongue (it can't be fast sea ice as it moves every day) and a big portion is about to break off (direction indicated by arrows).
From EOSDIS worldview Jan 25, 2019

44
Antarctica / Re: PIG has calved
« on: January 22, 2019, 08:01:39 PM »
A small part in the northeasternmost corner of the PIIS has calved these days. I circled the resulting iceberg and the corner where it broke off.
See attached picture.

45
Arctic sea ice / Re: "Stupid" Questions :o
« on: January 20, 2019, 10:26:49 PM »
If ppm of C02 are increasing in the atmosphere, that must mean ppm of something else is declining. What other atmospheric gas is declining as CO2 increases, and does this need for something else to decline at all effect the rate of growth of CO2 ppm in the atmosphere?

Carbon in fossil fuels are burned(oxidised) to create CO2, so it is O2 in atmosphere that is declining. The effect on O2 in the atmosphere is negligible:

CO2  280 ppm  -> 410ppm (46% change)
O2 209590ppm -> 209460ppm (0.06% change i.e. you experience more effect of less oxygen at top of small hill than at bottom)

Obviously this change in O2 hardly makes any difference to the ability to burn fossil fuels.

Edit ppm typos

If you take a typical hydrocarbon as a fossil fuel source you must also take the hydrogen atoms into account (octane taken as an example, the others look very similar):
C8H18 + 12.5 O2 → 8 CO2 + 9 H2O
This means that for every CO2 molecule you produce you lose a little more than 1.5 O2 molecules.
Of course some of the CO2 that is produced comes from black carbon (coal) where almost no hydrogen is present. So the ratio between CO2 gain and O2 loss may lie somewhere in-between 1.2 and 1.4. Nevertheless, the (slightly) increased O2 loss is negligible (as a fraction of existing oxygen in the atmosphere) compared to the relative strong increase of CO2.

47
Antarctica / Re: PIG has calved
« on: January 19, 2019, 08:56:22 PM »
Also at the NE edge of Pine Island Bay a massive disintegration of the fast ice occurred last week. See the new cracks (marked in red) and the little island (is that Pine Island?) at the bottom (marked in green), now freed from ice. Please be aware that these two pictures show the changes that happened last week (upper pic Jan 12, lower pic Jan 19)
Taken from EOSDIS worldview

48
Antarctica / Re: PIG has calved
« on: January 19, 2019, 08:38:22 PM »
A big change occured with the sea ice in front of PIIS within the last days. Please compare the two pictures from Jan 09 (above) and today (Jan 19, 2019), both taken from EOSDIS worldview.
It looks like a complete break-up and partial collapse of the sea ice, combined with a massive NW movement of the calved icebergs from Oct 2018 and the remains from the calving in 2017 (don't remember the month).
PIIS and the NW tributary fronts are now completely exposed to open water...

49
Antarctica / Re: What's new in Antarctica ?
« on: January 17, 2019, 07:52:09 PM »
"...But isn’t the big fear the Great Discontinuity, where a whole lot of ice areas begin similtaneous sudden collapse?  ..."

While it is of significant concern about how fast sea level might rise, the other big fear is that we start something that will continue for centuries and has a large net sea level increase.  Best estimates for Pliocene sea level, the last time CO2 was around 400 ppm,  are around 20 m higher than modern...
...which would cause probably one billion refugees who will look for another place to live and who can not be sent back to their original countries/areas because these will be then completely inundated.

50
Antarctica / Re: PIG has calved
« on: January 05, 2019, 07:42:36 PM »
I keep on watching the Amundsen Sector of Western Antarctica carefully. The last two days a large chunk of fast sea ice broke off in the Pine Island Bay. I have added a picture generated by the EOSDIS "Start Comparison" button. The right half was photographed on Nov 19, the left half is from today. Try this comparison option out by yourself!

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