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3 new papers - Cloud albedo the cause of warming (Read 126 times)
lee
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3 new papers - Cloud albedo the cause of warming
Oct 21st, 2021 at 4:54pm
 
Satellite and Ocean Data Reveal Marked Increase in Earth’s Heating Rate

"We show that independent satellite and in situ observations each yield statistically indistinguishable decadal increases in EEI from mid-2005 to mid-2019 of 0.50 ± 0.47 W m−2 decade−1 (5%–95% confidence interval). This trend is primarily due to an increase in absorbed solar radiation associated with decreased reflection by clouds and sea-ice and a decrease in outgoing longwave radiation (OLR) due to increases in trace gases and water vapor. These changes combined exceed a positive trend in OLR due to increasing global mean temperatures."

https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL093047



Radiative Energy Flux Variation from 2001–2020

"We found the declining outgoing shortwave radiation to be the most important contributor for a positive TOA (top of the atmosphere) net flux of 0.8 W/m2 in this time frame. We compare clear sky with cloudy areas and find that changes in the cloud structure should be the root cause for the shortwave trend. The radiative flux data are compared with ocean heat content data and analyzed in the context of a longer-term climate system enthalpy estimation going back to the year 1750. We also report differences in the trends for the Northern and Southern hemisphere. The radiative data indicate more variability in the North and higher stability in the South. The drop of cloudiness around the millennium by about 1.5% has certainly fostered the positive net radiative flux."

" Based upon recent CERES data, Loeb et al. [16], Wong et al. [17] and Ollila [18] reported an increasing downwelling shortwave (SW) radiation. Loeb et al. reported a decreasing TOA SW trend, mainly caused by a reduction in low cloud cover, and Ollila concluded that this increasing downwelling SW, which is particularly strong since 2014, may be responsible for a new wave of heating after the hiatus. This finding is in conflict with the assumption that further global warming originates mainly from the LW radiation capture caused by greenhouse gases, i.e., a decline of outgoing LW.

https://www.mdpi.com/2073-4433/12/10/1297/htm

Global Circulation Models (GCMs) Simulate the Current Temperature Only If the Shortwave Radiation Anomaly of the 2000s Has Been Omitted

"According  to  graphical  presentations  on  the temperature  effect  of  aerosols  by  Gillett,  the aerosol  effect  has  been  slowly  declining  since 1920 and being about -0.5 °C from 1990 onward. There  are  research  results  based  on  ground stations  and  satellite  observations  showing  that the global dimming turned into brightening about
1985 to 1990  [8,9,10]. The decisive evidence has come  from  the  shortwave  (SW)  radiation measurements  by  the  (CERES)  satellites since March 2000 [11]. These satellites measure total solar  irradiation  (TSI)  and  upwelling  SW radiation,  and  the  difference  is  the  downwelling SW radiation [7], Fig. 1. "

"The SW anomaly impacts show that there are natural  climate  drivers  that  have  rapid  and significant  temperature  impacts  exceeding  the anthropogenic  drivers  for  the period  of  2000-2019. "

https://www.researchgate.net/profile/Antero-Ollila/publication/353581425_Global_...

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