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- Title
Tracking Shallow Convective Mixing and Its Influence on Low‐Level Clouds With Stable Water Isotopes in Vapor.
- Authors
Hu, Jun; Bailey, Adriana; Nusbaumer, Jesse; Dee, Sylvia; Sasser, Christiana; Worden, John
- Abstract
Low‐cloud feedbacks contribute large uncertainties to climate projections and estimated climate sensitivity. A key physical process modulating low‐cloud feedbacks is shallow convective mixing between the boundary layer and the free troposphere. However, there are challenges in acquiring observational constraints of shallow convective mixing with global coverage. To this end, we propose a novel approach to constraining convective mixing using stable water vapor isotope profiles from satellite retrievals. We demonstrate that the vertical gradient of water vapor δD between the boundary layer and free troposphere can be used to track shallow convective mixing. Analyzing isotopes in water vapor alongside low‐cloud properties from satellite retrievals, we find that low‐cloud fraction appears largely insensitive to convective mixing in shallow cumulus regions. Our results also suggest that strong shallow convective mixing is associated with the moistening of the free troposphere. The new estimate of shallow convective mixing and its relationship with low‐cloud properties offers a potential constraint on simulations of low‐cloud feedbacks and estimates of climate sensitivity. Key Points: Estimates of shallow convective mixing in shallow cumulus regions are developed using satellite retrievals of water vapor isotopesStrong shallow convective mixing is associated with moistening of the free troposphere in the tropicsThe relationship between shallow convective mixing and low‐cloud fraction is spatially variable in shallow cumulus regions
- Subjects
CLIMATE Project; CLIMATE change; CONVECTIVE clouds; CONVECTION (Meteorology); CONVECTIVE flow
- Publication
Journal of Geophysical Research. Atmospheres, 2022, Vol 127, Issue 5, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2021JD035355