2020 Mauna Loa CO2 levels

[Tom_Mazanec]

Thanks for all the 2020 work. 

You're welcome, kassy.
I'll keep on my weekly CO₂ posting as well as the monthly updates on CO₂, CH₄, N₂O and SF₆ until all of them decrease on a year-to-year basis. 

You'll be posting for a llloooonnng time.

[Stephan]

Outlook:
Last year next week had an average of ca. 413.0 ppm. An increase of 2.25 ± 0.25 seems likely.

The first Sunday evening of a new decade, and time to start a new thread on Mauna Loa CO₂ levels.

Week beginning on December 27, 2020:     415.09 ppm
Weekly value from 1 year ago:                   412.80 ppm
Weekly value from 10 years ago:               390.00 ppm
Last updated: January 3, 2021

The annual increase of 2.29 ppm is as expected last week and lower than the 10 y average of 2.51 ppm/a.

Last week returned to stable values. As usual for this time of the year the values increase from day to day.

Outlook:
The first week of 2020 had an average of 413.0 ppm. Therefore I expect an annual increase of 2.40 ± 0.20 ppm in the forthcoming week.

Cross-posted into the "2021 Mauna Loa" thread. Please leave comments and additions there.

Please also keep in mind that I cannot move the poll which runs until 4^th of February. So it stays here.

[Stephan]

Here comes the official December 2020 average from Mauna Loa.

December 2020:       414.02 ppm
December 2019:       411.76 ppm
Last updated: January 12, 2021

The CO₂ concentration has increased by 2.26 ppm in the last 12 months. This is lower than the 10 y average of 2.423 ppm/a.