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Author Topic: Trends in Atmospheric N2O  (Read 404 times)

Stephan

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Trends in Atmospheric N2O
« on: October 03, 2019, 03:46:44 PM »
NOAA has opened a new site within its website https://www.esrl.noaa.gov/gmd/ccgg/trends_n2o/

It shows the actual [delayed by four months] concentration of nitrous oxide (N2O) and it seems to be updated once a month (like the trends in CH4 site)
May 2019:     331.7 ppb
May 2018:     330.7 ppb
Last updated: September 18, 2019
____________
The website also includes the annual averages and the annual increase rates:
The annual increase rate May 2019 of 1.0 ppb is slightly below the 2018 average increase (1.17 ppb).
The average increase rate of 2001-2009 was 0.74 ppb.
The average increase rate of 2010-2018 was 0.98 ppb.
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Stephan

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Re: Trends in Atmospheric N2O
« Reply #1 on: October 03, 2019, 06:21:26 PM »
After having downloaded and processed the data I show you the measured values and the 12-month running mean (upper picture) and the derivative of the 12-month running mean (expressed as increase rate, lower picture). Interestingly the increase rate seems to change in waves with a frequency of several years. I have no clue where this behaviour comes from. Does anyone have a clue?
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kassy

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Re: Trends in Atmospheric N2O
« Reply #2 on: October 03, 2019, 07:10:16 PM »
Interesting.

And no clue about the pattern but maybe we just don´t have enough years?

Nearly two third is natural but i don´t think we have a good list of relative contributions.

Most of the N2O emitted into the atmosphere, from natural and anthropogenic sources, is produced by microorganisms such as bacteria and fungi in soils and oceans.[97] Soils under natural vegetation are an important source of nitrous oxide, accounting for 60% of all naturally produced emissions. Other natural sources include the oceans (35%) and atmospheric chemical reactions (5%)

I think it will be quite a bit of work to explain the pattern (if it is real).

And the simple explanation might be ongoing warming promoting more emissions from soil and oceans over time while longer term patterns like ENSO and many others messing up the graph. 


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.

Stephan

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Re: Trends in Atmospheric N2O
« Reply #3 on: October 07, 2019, 10:34:52 PM »
The average value for June 2019 is available now:
June 2019:     331.8 ppb
June 2018:     330.7 ppb
Last updated: October 05, 2019
Annual increase a tiny bit higher than in May...

N2O has a 298-fold effect as GHG than CO2. The the June 2019 CO2 equivalent of 332 ppb N2O is 99 ppm, around a quarter of the CO2 effect and therefore not negligible.
« Last Edit: October 07, 2019, 10:41:31 PM by Stephan »
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Stephan

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Re: Trends in Atmospheric N2O
« Reply #4 on: November 07, 2019, 09:15:39 PM »
The July averages are available:
July 2019:     331.9 ppb
July 2018:     330.7 ppb
Last updated: November 05, 2019
Annual increase of 1.2 ppb is a tiny bit higher than in June...
It is too late just to be concerned about Climate Change