Gre and two lists:
1..This mainly to save others time (and wondering why eenews and
similar usually find it hard to give the original cite).. The article is
non-fee at:
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL091805#:~:text=The%20COVID%E2%80%9019%20pandemic%20changed%20emissions%20of%20gases%20and%20particulates.&text=COVID%E2%80%9019%20induced%20lockdowns%20led,the%20earth%20in%20spring%202020.
First author Andrew Gettelman
2. This is the first paragraph in the final section:
> ”In this work we have estimated the effects of COVID‐19 affected
> emissions changes in 2020. We use two ESMs with similar complexity of their
> cloud and aerosol schemes, but very different implementations. The two
> models, CESM and ECHAM‐HAM, yield very similar quantitative responses to the
> same emissions perturbations. The unique aspect of this study is we use
> simulations constrained by actual meteorology over 2020 to remove the effects
> of meteorological noise from the simulations. This results in the ability to
> find statistically significant changes much smaller than could be seen in
> observations (Diamond & Wood, 2020
> <https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL091805#grl61813-bib-0004>),
> and differs in that regard from previous work. The limitation of the study
> is to use one set of emissions perturbation estimates from Forster et al.
> (2020
> <https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL091805#grl61813-bib-0005>),
> though that estimate has been compared to observations.”
3. So I conclude the results likely to be pretty accurate (besides the
UCAR team has lots of experience).
And this phenomenon makes our CDR job harder, not easier.
Ron
> On Feb 6, 2021, at 12:58 PM, Greg Rau <gh...@sbcglobal.net> wrote:
>
>
>> https://www.eenews.net/stories/1063724319
>> <https://www.eenews.net/stories/1063724319>
>
> "While levels of CO2 and other gaseous pollutants were falling, so were
> emissions of aerosols that contain particles of sulfates, nitrates, black
> carbon and dust.
> When economies are roaring along, aerosols, led by soot and sulfate ions,
> tend to brighten clouds. That helps them reflect the sun's heat back into
> space.
>
> So with the absence of aerosols more sunlight fell on Earth. That made the
> planet slightly warmer, especially near industrial countries like the U.S.
> and Russia."
>
>
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