[Virtual} AOS Program Workshop on Cloud Feedbacks and Climate Sensitivity Informal Seminar

Wed, Aug 19, 2020, 12:00 pm to 1:00 pm

I'll start by motivating the need to better represent mixed-phase clouds in climate models, and their ramifications for the extratropical cloud optical depth feedback, which has been linked to the higher climate sensitivity of the CMIP6 models but yet whose sign is currently uncertain. Using the emergent constraint approach, I will present a unique method that uses satellite observations to decompose the contributions from clouds to the feedback categorized by their thermodynamic phase. Using this as guidance, I will discuss the extent to which shifts from stratocumulus to cumulus clouds contribute to a positive extratropical cloud optical depth feedback based on the recent satellite record. This will be followed by an analysis of the role of ice nucleation in the feedback based on version 5 of NASA's Goddard Earth Observing System (GEOS-5) model. Finally, observational constraints on the cloud optical depth feedback are proposed based on lessons learned about the importance of the representation of cloud microphysical properties for large-scale feedback.

Location: 
Virtual
Speaker(s): 

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[Virtual} AOS Program Workshop on Cloud Feedbacks and Climate Sensitivity Informal Seminar

[Virtual} AOS Program Workshop on Cloud Feedbacks and Climate Sensitivity Informal Seminar

[Virtual} AOS Program Workshop on Cloud Feedbacks and Climate Sensitivity Informal Seminar

[Virtual} AOS Program Workshop on Cloud Feedbacks and Climate Sensitivity Informal Seminar