@inproceedings{Jia:2022:10.5194/egusphere-egu22-4896,
author = {Jia, H and Quaas, J and Gryspeerdt, E and Böhm, C and Sourdeval, O},
doi = {10.5194/egusphere-egu22-4896},
title = {Addressing the difficulties in quantifying the Twomey effect for marine warm clouds from multi-sensor satellite observations and reanalysis},
url = {http://dx.doi.org/10.5194/egusphere-egu22-4896},
year = {2022}
}

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TY  - CPAPER
AB  - <jats:p>&lt;p&gt;Aerosol&amp;#8211;cloud interaction is the most uncertain component of the overall anthropogenic forcing of the climate, in which the Twomey effect plays a fundamental role. Satellite-based estimates of the Twomey effect are especially challenging, mainly due to the difficulty in disentangling aerosol effects on cloud droplet number concentration (&lt;em&gt;N&lt;/em&gt;&lt;sub&gt;d&lt;/sub&gt;) from possible confounders. By combining multiple satellite observations and reanalysis, this study investigates the impacts of a) updraft, b) precipitation, c) retrieval errors, as well as (d) vertical co-location between aerosol and cloud, on the assessment of&amp;#160;&lt;em&gt;N&lt;/em&gt;&lt;sub&gt;d&lt;/sub&gt;-toaerosol sensitivity (&lt;em&gt;S&lt;/em&gt;) in the context of marine warm (liquid) clouds. Our analysis suggests that&amp;#160;&lt;em&gt;S&lt;/em&gt;&amp;#160;increases remarkably with both cloud base height and cloud geometric thickness (proxies for vertical velocity at cloud base), consistent with stronger aerosol-cloud interactions at larger updraft velocity. In turn, introducing the confounding effect of aerosol&amp;#8211;precipitation interaction can artificially amplify&amp;#160;&lt;em&gt;S&lt;/em&gt;&amp;#160;by an estimated 21 %, highlighting the necessity of removing precipitating clouds from analyses on the Twomey effect. It is noted that the retrieval biases in aerosol and cloud appear to underestimate&amp;#160;&lt;em&gt;S&lt;/em&gt;, in which cloud fraction acts as a key modulator, making it practically difficult to balance the accuracies of aerosol&amp;#8211;cloud retrievals at aggregate
AU  - Jia,H
AU  - Quaas,J
AU  - Gryspeerdt,E
AU  - Böhm,C
AU  - Sourdeval,O
DO  - 10.5194/egusphere-egu22-4896
PY  - 2022///
TI  - Addressing the difficulties in quantifying the Twomey effect for marine warm clouds from multi-sensor satellite observations and reanalysis
UR  - http://dx.doi.org/10.5194/egusphere-egu22-4896
ER  - 

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