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New Observational Constraints on Warm Rain Processes and Their Climate Implications

Dong, Xiquan and Wu, Peng and Wang, Yuan and Xi, Baike and Huang, Yiyi (2021) New Observational Constraints on Warm Rain Processes and Their Climate Implications. Geophysical Research Letters, 48 (6). Art. No. e2020GL091836. ISSN 0094-8276. doi:10.1029/2020gl091836.

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Low stratiform clouds have profound impacts on the hydrological cycle and the Earth’s radiation budget. However, realistic simulation of low clouds in climate models presents a major challenge. Here we employ the newly retrieved cloud and drizzle microphysical properties to improve the autoconversion and accretion parameterizations in a microphysical scheme. We find that the new autoconversion (accretion) rate contributes 14% lower (greater) to total drizzle water content than the original scheme near the cloud top. Compared to satellite results, the simulated cloud liquid water path (LWP) and shortwave cloud radiative effect using the original scheme in a climate model agree well on global average but with large regional differences. Simulations using the updated scheme show a 7.3% decrease in the light rain frequency, and a 10% increase in LWP. The updated microphysics scheme alleviates the long‐lasting problem in most climate models, that is “too frequent and too light precipitation.”

Item Type:Article
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URLURL TypeDescription
http://www.archive.arm.govRelated ItemData
Dong, Xiquan0000-0002-3359-6117
Wu, Peng0000-0001-7066-5487
Wang, Yuan0000-0001-6657-8401
Xi, Baike0000-0001-6126-2010
Huang, Yiyi0000-0001-5090-9712
Additional Information:© 2021. American Geophysical Union. Issue Online: 24 March 2021; Version of Record online: 24 March 2021; Accepted manuscript online: 15 March 2021; Manuscript accepted: 04 March 2021; Manuscript revised: 11 February 2021; Manuscript received: 24 November 2020. This research was supported by the NSF project under grant AGS‐1700728/AGS‐2031750 at the University of Arizona and AGS‐1700727/AGS‐2031751 at California Institute of Technology. The researchers at the University of Arizona were also supported as part of the “Enabling Aerosol‐cloud interactions at GLobal convection‐permitting scalES (EAGLES)” project (74358), funded by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research (BER), Earth System Modeling program with the subcontract to the University of Arizona. Y.W. acknowledges the support of the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. Measurements during ACE‐ENA IOP were obtained from the Atmospheric Radiation Measurement (ARM) Program sponsored by the U.S. Department of Energy (DOE) Office of Energy Research, Office of Health and Environmental Research, and Environmental Sciences Division. Data Availability Statement:The data can be downloaded from Ground‐based MBL cloud and drizzle microphysical property retrievals are archived at
Funding AgencyGrant Number
Enabling Aerosol-cloud interactions at GLobal convection-permitting scalES (EAGLES)74358
Department of Energy (DOE)UNSPECIFIED
University of ArizonaUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20210503-085353785
Persistent URL:
Official Citation:Dong, X., Wu, P., Wang, Y., Xi, B., & Huang, Y. (2021). New observational constraints on warm rain processes and their climate implications. Geophysical Research Letters, 48, e2020GL091836.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108916
Deposited By: Tony Diaz
Deposited On:03 May 2021 18:08
Last Modified:03 May 2021 18:08

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