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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #50 on: April 30, 2023, 06:34:57 PM »
The first ten days of April were in line with predictions, but then it has picked up. If the month ended today, the monthly average would be almost 3 standard deviations above the Met Office forecast for the "La Niña scenario". We have to see daily values consistently below 423 ppm for the rest of the month to change that.
The last day below 423 ppm was on April 21, 2023. Unfortunately the values reached unprecedentedly high levels, peaking at 425.01 ppm on April 28. Therefore the weekly average is also the highest ever measured:

Week beginning on April 23, 2023:     424.40 ppm
Weekly value from 1 year ago:           420.19 ppm
Weekly value from 10 years ago:        399.32 ppm
Last updated: April 30, 2023

The annual increase is at 4.21 ppm, the highest jump I can remember. No question, it is by far higher than the 10 y average of 2.51 ppm/a. I just can hope that this week will be the highest in 2023 and the start into the seasonal drop during Northern summer will begin earlier than usual.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #51 on: April 30, 2023, 10:08:31 PM »
The annual increase is at 4.21 ppm, the highest jump I can remember.

It is at #14. The highest weekly increases were (with dates giving the start of the week):

2016-07-31: 5.07 ppm (hence why the scale in my plot goes from 0 to 6 ppm/yr)
2016-06-12: 4.80 ppm
2016-04-10: 4.56 ppm
2016-05-22: 4.54 ppm
2019-04-28: 4.45 ppm
2012-05-06: 4.40 ppm
2014-04-13: 4.34 ppm
2016-01-31: 4.33 ppm
2020-03-22: 4.30 ppm
1998-07-19: 4.26 ppm
2016-04-17: 4.24 ppm
2010-04-18: 4.24 ppm
2023-04-23: 4.21 ppm
2016-03-20: 4.20 ppm

Note that 7 of the top 15 weeks are from 2016, during that year's record El Niño. An increase like we've seen last week is very unusual under ENSO-neutral conditions.

Same goes for most of April, actually. If we go by the Met Office forecast, April 2023 is on its way to becoming a 4-sigma event.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #52 on: April 30, 2023, 10:29:49 PM »
Thank you for the research on the increase rates.
How many weeks have passed since Prof Keeling started his long experiment? 65 years * 52 = 3,380. A # 14 of 3,380 is at the very upper end of this long data series.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #53 on: May 01, 2023, 06:23:07 PM »
Thank you for the research on the increase rates.
How many weeks have passed since Prof Keeling started his long experiment? 65 years * 52 = 3,380. A # 14 of 3,380 is at the very upper end of this long data series.

There are 2,467 weeks with useful data, the first in 1975. 35 of those weeks had a negative yearly increase; in 2,429 weeks it was positive. Being #14 in that list is indeed remarkable.
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trm1958

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Re: 2023 Mauna Loa CO2 levels
« Reply #54 on: May 02, 2023, 02:43:05 PM »
Quote
Note that 7 of the top 15 weeks are from 2016, during that year's record El Niño. An increase like we've seen last week is very unusual under ENSO-neutral conditions.

And now we are probably entering El Nino conditions, perhaps a new record...

Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #55 on: May 07, 2023, 10:08:51 PM »
Mauna Kea CO2 on a new record level.

Week beginning on April 30, 2023:     424.45 ppm
Weekly value from 1 year ago:           420.18 ppm
Weekly value from 10 years ago:        399.74 ppm
Last updated: May 07, 2023

Last week's maximum has been topped by another 0.05 ppm. The annual increase of 4.27 ppm is at #10 in Renerpho's ranking list, putting last week's increase down by one notch to #15. It is of course higher than the 10 y average (2.47 ppm/a). The intra-day variations were quite high, the inter-day variations were rather small. It may well be that we reached this season's maximum. The next two weeks should decide that.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #56 on: May 10, 2023, 07:13:59 PM »
A little later than usual NOAA has published its latest monthly CO2 average.

April 2023:       423.28 ppm
April 2022:       420.23 ppm
April 2013:       398.41 ppm
Last updated: May 09, 2023

It is the highest monthly CO2 average since ages.
The annual increase of 3.05 ppm is the highest since April 2020. It is well above the 10 y average of 2.49 ppm/a.

I set an index of 100 to the year 1980 [338.75 ppm]. April 2023 is at 125.0 compared to that index.
« Last Edit: May 10, 2023, 07:31:29 PM by Stephan »
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gerontocrat

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Re: 2023 Mauna Loa CO2 levels
« Reply #57 on: May 10, 2023, 07:41:26 PM »
& here is the graph + the graph for Global C02 to Feb '23

click images to enlarge
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #58 on: May 10, 2023, 08:09:04 PM »
Thank you - as always - for the graphs.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #59 on: May 14, 2023, 07:12:02 PM »
NOAA data
Scripps data
Met Office forecast for 2023

Although we're possibly past the yearly maximum, with the highest daily values recorded this year being 415.01 ppm (NOAA) and 424.22 ppm (Scripps), the first half of May has continued the trend set in April -- namely, large annual increases well above what was predicted by Met Office.

To get back on trend, annual increases have to come down to 2 ppm or below.

If we actually have seen the maximum for the year, it would be a very early one (April 26-28). I don't remember a maximum in April.



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gerontocrat

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Re: 2023 Mauna Loa CO2 levels
« Reply #60 on: May 14, 2023, 07:45:04 PM »
The UK Met Office Forecast has some sobering info.

To limit global warming to 1.5° with little or no overshoot (IPCC 2022) the decadal average  CO2 rises in the 2020's have to reduce to 1.33ppm per year from the 2010's average of 2.41ppm per year. i.e. a 45% drop. We are getting towards 3.5 years through the 2020's, with annual increases more likely increasing than decreasing.

It really is mission impossible. IMO if average annual increases drop below 2ppm this decade it would be a major miracle.

From the UK Met Office forecast   
Decade    Average CO2 rise
              (ppm per year)
1960s   0.86
1970s   1.22
1980s   1.58
1990s   1.55
2000s   1.91
2010s   2.41

Table 4. Decadal average CO2 rises in the C1-IMP-LD scenario for limiting global warming to 1.5° with little or no overshoot (IPCC 2022).

Decade    Average CO2 rise
              (ppm per year)
2020s      +1.33
2030s       -0.14
2040s       -0.53
2050s       -0.65
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #61 on: May 14, 2023, 09:18:27 PM »
Please find the latest weekly Mauna Kea CO2 average.

Week beginning on May 07, 2023:     424.29 ppm
Weekly value from 1 year ago:          420.75 ppm
Weekly value from 10 years ago:       399.74 ppm
Last updated: May 14, 2023

The value is slightly below the record level from last week. But still the annual increase of 3.54 ppm is way above the 10 y average of 2.45 ppm/a and much higher than "allowed" if I refer to gerontocrat's previous post.
If I look at the daily values we are still at the seasonal maximum, no trend change visible. Another record week is still in the cards...
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #62 on: May 21, 2023, 06:05:57 PM »
Sunday evening - an update on Mauna Kea CO2 weekly average.

Week beginning on May 14, 2023:     423.50 ppm
Weekly value from 1 year ago:          421.20 ppm
Weekly value from 10 years ago:       400.14 ppm
Last updated: May 21, 2023

The increase rate is seemingly back to normal. The annual increase of 2.30 ppm is close to the 10 year average of 2.34 ppm/a. But - a sudden drop on May 17, 18 and 19, followed by an increase back to higher level - may have obscured a still too high annual increase rate. Therefore this week shouldn't be taken too seriously.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #63 on: May 28, 2023, 08:20:23 PM »
Sunday evening, it is time for an update on Mauna Kea weekly CO2 average.

Week beginning on May 21, 2023:     423.91 ppm
Weekly value from 1 year ago:          421.31 ppm
Weekly value from 10 years ago:       400.25 ppm
Last updated: May 28, 2023

The annual increase is at 2.60 ppm, higher than the 10 year average of 2.36 ppm/a.
We are still at the seasonal maximum. May 27 had the third highest daily average (424.57 ppm). There is no sign that the decrease into the seasonal minimum (Sep/Oct) has started.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #64 on: June 04, 2023, 06:15:52 PM »
Sunday evening again, it is time for an update on Mauna Kea weekly CO2 average.
It is the highest weekly average since ages.

Week beginning on May 28, 2023:     424.64 ppm
Weekly value from 1 year ago:          421.71 ppm
Weekly value from 10 years ago:       399.94 ppm
Last updated: June 04, 2023

The annual increase of 2.93 ppm is again above the 10 year average of 2.47 ppm/a. Three daily averages (424.7 ppm) almost tie with the record high daily average of 425.01 ppm on April 28. All seven days were very stable with low intra-day fluctuations. So far no start of the seasonal decrease has been observed.
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kassy

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Re: 2023 Mauna Loa CO2 levels
« Reply #65 on: June 04, 2023, 06:58:51 PM »
Already looking forward to next week... 
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #66 on: June 06, 2023, 05:25:33 PM »
I have noticed that NOAA has published its latest monthly average. I am on a business trip today so I won't find the time to do an analysis today; very probably I'll do it tomorrow.
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kassy

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Re: 2023 Mauna Loa CO2 levels
« Reply #67 on: June 07, 2023, 11:06:53 AM »
Quote
ENSO could be masking bigger rise

Mark Howden, a climate scientist and IPCC contributing author at the Australian National University, said the increase in CO2 in the atmosphere was not a surprise, and could be masked by the El Niño Southern Oscillation (ENSO).

High rainfall during La Niña increases growth which leads to more carbon sequestration in vegetation, as well as bushfire suppression.

But if we move into El Niño, that sequestration is likely to be undone.

"[A potential] El Niño means that probably next year our CO2 will go up by more than 3 parts per million," said Professor Howden, who wasn't involved in the Mauna Loa observations.

"That's because El Niño tends to dry out continents like Australia, which means you actually lose more carbon through decomposition than you gain through plant growth."

https://www.abc.net.au/news/science/2023-06-06/science-atmospheric-co2-hits-record-high/102444412
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #68 on: June 07, 2023, 07:35:01 PM »
NOAA has published its latest monthly CO2 average.

May 2023:       424.00 ppm
May 2022:       420.99 ppm
May 2013:       399.78 ppm
Last updated: Jun 05, 2023

It is the highest monthly CO2 average since ages.
The annual increase of 3.05 ppm is the third highest since April 2020. It is well above the 10 y average of 2.42 ppm/a. The long-term (1959-2023) linear trend of the increase rate says that the annual increase should be at 2.50 ppm/a

I set an index of 100 to the year 1980 [338.75 ppm]. May 2023 is at 125.2 compared to that index.
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gerontocrat

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Re: 2023 Mauna Loa CO2 levels
« Reply #69 on: June 07, 2023, 08:34:17 PM »
Graphs attached - Mauna Loa, & Global (to March 2023)

Of note is that Mauna Loa CO2 ppm this month is greater than the linear trend for 2030.

click images to enlarge
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #70 on: June 11, 2023, 04:39:00 PM »
Sunday afternoon in Germany. A warm, sunny, dry and very windy day. Wildfires around Jüterbog (Brandenburg) add a further very tiny amount of GHG into the atmosphere...

Week beginning on June 04, 2023:     424.38 ppm
Weekly value from 1 year ago:           421.29 ppm
Weekly value from 10 years ago:       399.37 ppm
Last updated: June 11, 2023

The weekly average is the second highest in recorded history. The annual increase is at 3.09 ppm, higher than the 10 y average of 2.50 ppm/a. The last three days showed signs that the seasonal maximum has passed now. The intra-day variation was rather small, except for June 5 and 6.
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FishOutofWater

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Re: 2023 Mauna Loa CO2 levels
« Reply #71 on: June 12, 2023, 03:26:06 AM »
Yes, El Niño is beginning to dry out the continents starting with Canada and the extreme fires.

This jump to 424ppms CO2 for May is pretty shocking. Given that humans have also caused CH4 levels to elevate and we have added everything from Fluorocarbons to SF6 to further increase the greenhouse warming, we can kiss the 1.5C limit goodbye. And once 1.5 is overrun, feedbacks kick in to add more ghgs and warming. The last time CO2 alone was this high, sea levels were about 20m higher.

Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #72 on: June 13, 2023, 10:10:59 AM »
The last three days showed signs that the seasonal maximum has passed now.

June 11's value of 424.81 ppm is one of the highest ever. Maybe your hopes that we have passed the seasonal maximum were premature.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #73 on: June 18, 2023, 04:21:02 PM »
Please find the latest weekly average from Mauna Kea on CO2.

Week beginning on June 11, 2023:     424.13 ppm
Weekly value from 1 year ago:           421.05 ppm
Weekly value from 10 years ago:        398.78 ppm
Last updated: June 18, 2023

The annual increase stays above 3 ppm (3.08 ppm/a) which still is above the 10 year average of 2.535 ppm/a. Unlike the weeks before the intra-day fluctuations were very high, so there is no pattern detectable which would prove that the seasonal maximum now has passed.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #74 on: June 21, 2023, 04:45:20 PM »
NOAA data
Scripps data
Met Office forecast for 2023

I think we have passed the yearly maximum now. I say "I think" because the decline is unusually late, and we may end up with a monthly average for June that's not significantly different from that of the previous month (see the red line in the first image). Even under El Niño conditions, I don't think I have seen something like this before.

We need NOAA values near or below 422 ppm for the entire rest of June for this to end up as a somewhat "normal" month (close to the forecast). As things are going, I'm not sure we will see a single day below 423 ppm.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #75 on: June 21, 2023, 05:05:56 PM »
The UK Met Office Forecast has some sobering info.

To limit global warming to 1.5° with little or no overshoot (IPCC 2022) the decadal average  CO2 rises in the 2020's have to reduce to 1.33ppm per year from the 2010's average of 2.41ppm per year. i.e. a 45% drop. We are getting towards 3.5 years through the 2020's, with annual increases more likely increasing than decreasing.

Yes it does, and it is quite likely we'll step outside of the range that's necessary to reach the 1.5° scenario for the first time this year (green line). Making it back into/below the grey envelope will turn harder and harder with each year that passes.

The projection (the red star) is for an annual increase of +1.97 ppm in 2023. Looking at monthly averages and the growing El Niño that's on the horizon, we're on track for something like 2.5 ppm. The green star sits at +2.32 ppm.
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Re: 2023 Mauna Loa CO2 levels
« Reply #76 on: June 21, 2023, 06:06:29 PM »
I think we have passed the yearly maximum now. I say "I think" because the decline is unusually late, and we may end up with a monthly average for June that's not significantly different from that of the previous month (see the red line in the first image). Even under El Niño conditions, I don't think I have seen something like this before.

2022 May and June averages were identical at 420.99. May is usually higher, we have to go back to 2000 for June being higher than May:
2000    5   2000.3750      371.75   
2000    6   2000.4583      371.87

So that does occasionally happen but probably not this year judging by June average already being lower with several days to go.

Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #77 on: June 21, 2023, 06:38:51 PM »
2022 May and June averages were identical at 420.99.
The situation was a bit different, because May 2022 was unusually low, with June back "on track" (compare the chart here). But still, I should have mentioned that.

Quote
So that does occasionally happen but probably not this year judging by June average already being lower with several days to go.
The red line in my first chart is a projection. If we see average rates of decline for the rest of June 2023, we should land where it indicates, just below the value we had in May.
If you just take the average of the first 20 days of June 2023, that is 424.19 ppm, which is 0.19 ppm higher than the May average. Given that the rate of decline so far has been well below what we usually see in June, it's anybody's guess where we'll end up. In 2000, the June average was 0.12 ppm above that of May.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #78 on: June 25, 2023, 06:03:38 PM »
Sunday evening is the time for a Mauna Kea CO2 update.

Week beginning on June 18, 2023:     423.49 ppm
Weekly value from 1 year ago:           420.88 ppm
Weekly value from 10 years ago:       398.39 ppm
Last updated: June 25, 2023

The annual increase of 2.61 ppm is lower than in the last weeks, and closer to the 10 y average of 2.51 ppm/a compared to the last weeks. It also seems that finally and later than usual the seasonal maximum has now passed. The intra-day variations were smaller than last week but they are still quite high.
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kassy

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Re: 2023 Mauna Loa CO2 levels
« Reply #79 on: June 25, 2023, 07:02:33 PM »
Lets hope it has.

Week beginning on June 18, 2023: 73.49 ppm over the 350.org target and 143.49 over 280.
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Re: 2023 Mauna Loa CO2 levels
« Reply #80 on: July 02, 2023, 06:12:32 PM »
The seasonal maximum has passed. Last week there was a real drop, so the annual increase is below the 10 y average.

Week beginning on June 25, 2023:     422.19 ppm
Weekly value from 1 year ago:         420.37 ppm
Weekly value from 10 years ago:         398.78 ppm
Last updated: July 02, 2023

The numbers: Annual increase last week is at 1.82 ppm, 10 y average 2.34 ppm/a.
The intra-day fluctuations were quite low.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #81 on: July 06, 2023, 05:10:19 PM »
NOAA data
Scripps data
Met Office forecast for 2023

We saw a bit of a "relief" in late June, with a dip in CO2 levels, bringing the monthly average to 423.68 ppm (1.08 ppm above the Met Office forecast, but 0.32 ppm below the previous month). The Met Office prediction for July is 420.6 ppm, which would be an increase of 1.7 ppm over the previous year. However, the last three months were all about 1 ppm above the Met Office prediction, and if the first five days of July are anything to go by, July may be up there as well. It looks like the dip we saw in late June was short lived.
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Bruce Steele

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Re: 2023 Mauna Loa CO2 levels
« Reply #82 on: July 06, 2023, 06:00:55 PM »
There is a string of NOAA buoys that span the equatorial pacific from 110W to 170W named TAO array. They monitor both atmospheric and dissolved CO2 from surface waters. When an El Niño moves surface water from west to east it overlaps the upwelling plume that normally stretches from east to west starting near Ecuador .
https://www.pmel.noaa.gov/co2/story/Open+Ocean+Moorings
So we should expect the dissolved CO2 readings to drop but so far they are not dropping as you would expect with the surface warm water plume already forming. Atmospheric CO2 at Mauna Kea will respond to the reduction in ocean to atmosphere venting when the TAO array begins to show a drop as it did in 2016.
 More on the effect here
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5668685/#:~:text=The%20overall%20increase%20in%20the,combined%20with%20enhanced%20fire%20emissions.

FishOutofWater

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Re: 2023 Mauna Loa CO2 levels
« Reply #83 on: July 06, 2023, 07:56:21 PM »
From your linked article:

The early stage negative XCO2 anomaly is unique to the tropical Pacific Ocean and is not influenced by global, terrestrial or large-spatial scale fluxes.

What's different so far this El Niño is that strong trade winds continue in the northeastern subtropical Pacific.

Bruce Steele

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Re: 2023 Mauna Loa CO2 levels
« Reply #84 on: July 06, 2023, 10:39:17 PM »
FishOutOfWater, I was waiting for the CO2 signal to change in the TAO array. I assume it will change shortly because surface water temperatures have already increased.  Is the continuation of the trades affecting upwelling ?

Here is the part of the article I thought relevant
“ The El Niño-CO2 signature should have a significant tropical Pacific Ocean component as well, with opposite sign to the terrestrial response (10, 13, 33). During strong El Niño events, there is a large-scale weakening of the easterly trade winds and suppression of eastern equatorial Pacific upwelling (indicated by a deeper thermocline) that reduces the supply of cold, carbon-rich waters to the surface (Fig. 1). This reduces the usual strong outgassing of CO2 from this region (52–67), typically on the order of ~0.4–0.6 PgC yr−1 to the atmosphere, by ~40–60% during an El Niño event (9–12, 33, 36, 60, 73). If net fluxes were to remain constant elsewhere, these substantial net air-sea CO2 anomalies should lead to a reduction in the growth rate of atmospheric CO2, at least during the early stages of El Niño.”

gerontocrat

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Re: 2023 Mauna Loa CO2 levels
« Reply #85 on: July 06, 2023, 11:16:01 PM »
Monthly data updated by https://gml.noaa.gov/ccgg/trends/

I attach Mauna Loa CO2 graph to June 2023 (423.68) and Gobal CO2 graph to April 2023 (420.54).

click images to enlarge
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #86 on: July 07, 2023, 09:17:50 PM »
Just for completion here is the latest CO2 monthly value from Mauna Kea in my format:

June 2023:       423.68 ppm
June 2022:       420.99 ppm
June 2013:       398.61 ppm
Last updated: Jul 05, 2023

It is - behind May 2023 - the second highest ever measured CO2 concentration in the air.
The annual increase is at 2.69 ppm/a, higher than the 10 y average of 2.51 ppm/a.
It is also by 0.26 ppm/a above the long-term linear trend line which says that the increase rate in June 2023 should be at 2.43 ppm/a.

I set an index of 100 to the year 1980 [338.75 ppm]. June 2023 is at 125.2 compared to that index.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #87 on: July 16, 2023, 07:54:57 PM »
Weekend's end means new Mauna Kea CO2 data.

Week beginning on July 09, 2023:     422.02 ppm
Weekly value from 1 year ago:          419.18 ppm
Weekly value from 10 years ago:       397.93 ppm
Last updated: July 16, 2023

The annual increase is at 2.84 ppm, now again higher than the 10 y average of 2.41 ppm/a. The values decreased very regularly and smoothly with a very low inter- and intra-day variation.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #88 on: July 16, 2023, 11:24:58 PM »
NOAA data
Scripps data
Met Office forecast for 2023

For the past few weeks, the yearly increases in Scripps data has been larger than that from NOAA, by 0.5 ppm. I am currently trying to find out if Scripps have maybe changed their scale (like NOAA did two years ago), but so far I haven't found a conclusive explanation. Maybe it is just random variation...

In the mean time, the July data from NOAA continue to be about 1 ppm above the Met Office forecast, continuing the trend we've seen since April.
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John_the_Younger

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Re: 2023 Mauna Loa CO2 levels
« Reply #89 on: July 16, 2023, 11:35:54 PM »
Am I correct to thinking that when the current annual increase is greater than the average increase over a decade it means the increase is accelerating?

What we want (ultimately) is for there to be annual decreases in atmospheric CO2 (until we get to something like 350 ppm).

What "we" want (by 2030 or 2050*) is for there to be no annual increase. [* - I postulate that the date correlates with the age of the politician - older ones want an earlier date as younger ones want to milk the oil companies for more years]

In order to get there we have to first get to annual increases matching decade-average increases.  Does anybody project when this milestone needs to be reached in order to manifest the 2030 or 2050 goal?




Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #90 on: July 23, 2023, 06:25:17 PM »
Am I correct to thinking that when the current annual increase is greater than the average increase over a decade it means the increase is accelerating?
[...]
Please find attached the annual increase rate from NOAA / Mauna Loa from 1959 until today (see graph). You can see a linear increase of the increase rate which is identical to a constant acceleration. The two major El Niño events from 1998 and 2017 can be identified by spikes.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #91 on: July 23, 2023, 06:30:27 PM »
Sunday evening: It is time for another weekly average update on Mauna Kea CO2.

Week beginning on July 16, 2023:     421.69 ppm
Weekly value from 1 year ago:          418.36 ppm
Weekly value from 10 years ago:      396.93 ppm
Last updated: July 23, 2023

The annual increase is back above 3 ppm (3.33 ppm/a) and thus higher than the 10 y average of 2.48 ppm/a. Unlike the past weeks the intra-day variations were quite large; maybe this is the reason for this (too) high increase rate. Next week will reveal this.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #92 on: July 27, 2023, 03:04:48 PM »
Unlike the past weeks the intra-day variations were quite large; maybe this is the reason for this (too) high increase rate. Next week will reveal this.

If the week ended today (four days in), we would have an increase of 4.3 ppm compared to last year, one of the highest ever observed. And intra-day variability has been low.

Fingers crossed that values go down a bit before Sunday!
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #93 on: July 29, 2023, 10:53:32 PM »
Unlike the past weeks the intra-day variations were quite large; maybe this is the reason for this (too) high increase rate. Next week will reveal this.

If the week ended today (four days in), we would have an increase of 4.3 ppm compared to last year, one of the highest ever observed. And intra-day variability has been low.

Fingers crossed that values go down a bit before Sunday!

The opposite has been the case. We have seen daily values near 423 ppm for the last few days, putting us on course for 4.4 ppm.

We need a daily value below 421 ppm on July 29th for this week to end outside the all-time top 15, and an all-time top 5 is possible.

The funny thing is that Scripps CO2 data don't show the same spike, which may be a saving grace. NOAA data may turn out to suffer from some kind of measurement error or something, because both the values themselves, and the difference between the two stations, are incredibe...
« Last Edit: July 29, 2023, 11:03:21 PM by Renerpho »
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kiwichick16

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Re: 2023 Mauna Loa CO2 levels
« Reply #94 on: July 30, 2023, 04:35:36 AM »
looking at a minimum of 417 - 418 ?

Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #95 on: July 30, 2023, 10:44:18 AM »
looking at a minimum of 417 - 418 ?

Yes, probably somewhere in that range for the daily averages. MetOffice had forecasted a monthly average of 417.1 ppm for September. With the current trend, we are looking maybe at 418 ppm instead. That's a monthly average, so roughly half of days should be below this. If we're lucky, there's an outlier that goes below 417 for a day or two. Variability at that time of the year is usually low compared to the northern hemisphere spring, but when there's an outlier, it can be quite far (that's how we unexpectedly touched 414 ppm in September 2022 for one last time).
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #96 on: July 30, 2023, 07:02:53 PM »
Sunday afternoon - time for an update of Mauna Kea CO2.

Week beginning on July 23, 2023:     422.53 ppm
Weekly value from 1 year ago:          418.03 ppm
Weekly value from 10 years ago:      397.30 ppm
Last updated: July 30, 2023

The annual increase is at 4.50 ppm. This is much higher than it "should" be, and of course higher than the 10 y average of 2.52 ppm/a.
As already discussed in the past posts, there seems to be a problem with the data.
I attach a graph from NOAA of the last four weeks. Until July 20 the values went slightly down according to the seasonal cycle (blue line shows the trend, dashed from July 21 on). After July 21 all values are on a higher level, even with a slight increase (green line).
Let's have a look whether these values will be corrected in the future or whether this abnormal behaviour - with even higher increase rates to be expected then - continues.
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #97 on: July 30, 2023, 08:09:04 PM »
The annual increase is at 4.50 ppm. This is much higher than it "should" be, and of course higher than the 10 y average of 2.52 ppm/a.
As already discussed in the past posts, there seems to be a problem with the data.

If confirmed, this would be #5 in the all-time "ranking" (out of about 2,500 weeks with usable data in the records).

The reason why I think that the data may be unreliable are not the rising levels per se. We have seen so many strange things this year that I'd believe this one as well. However, the fact that Scripps (which also record CO2 on Hawaii) show a continuous decrease, at a weekly average of 420.79 ppm (a year-to-year increase of 3.19 ppm), makes me wonder. That's still high, but nowhere near what NOAA is producing. The two usually agree well with each other.

Next week should be interesting. As will be the monthly average. Compared to the MetOffice forecast, we're on track for a +5.5 sigma deviation.
« Last Edit: July 31, 2023, 12:17:38 PM by Renerpho »
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Renerpho

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Re: 2023 Mauna Loa CO2 levels
« Reply #98 on: July 31, 2023, 11:27:28 PM »
NOAA have made a slight correction to last week's data today, bringing the increase for that week down to 4.40 ppm, with a weekly average of 422.43 ppm. That doesn't resolve the issue I was talking about, but it makes the discrepancy a bit smaller.

The daily average published for July 30 (421.43 ppm) looks okay again.
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Stephan

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Re: 2023 Mauna Loa CO2 levels
« Reply #99 on: August 06, 2023, 07:48:43 PM »
At the end of the weekend another NOAA CO2 weekly average is available.

Week beginning on July 30, 2023:     421.61 ppm
Weekly value from 1 year ago:          418.10 ppm
Weekly value from 10 years ago:       396.80 ppm
Last updated: August 06, 2023

Are we on the path of normalisation? Hard to say as the annual increase is still at unbelievable 3.51 ppm, much higher than the 10 y average of 2.48 ppm/a. At least the very high increase rate of last week did not repeat itself. The values decrease slightly, but are well above of the dashed blue line of my last post. In addition, intra-day variations were pretty high yesterday, so that only six days counted for the average.

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