skip to main content

DOE PAGESDOE PAGES

Title: Impact of cloud radiative heating on East Asian summer monsoon circulation

The impacts of cloud radiative heating on East Asian Summer Monsoon (EASM) over the southeastern China (105°-125°E, 20°-35°N) are explained by using the Community Atmosphere Model version 5 (CAM5). Sensitivity experiments demonstrate that the radiative heating of clouds leads to a positive effect on the local EASM circulation over southeastern China. Without the radiative heating of cloud, the EASM circulation and precipitation would be much weaker than that in the normal condition. The longwave heating of clouds dominates the changes of EASM circulation. The positive effect of clouds on EASM circulation is explained by the thermodynamic energy equation, i.e. the different heating rate between cloud base and cloud top enhances the convective instability over southeastern China, which enhances updraft consequently. The strong updraft would further result in a southward meridional wind above the center of the updraft through Sverdrup vorticity balance.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Chinese Academy of Sciences (CAS), Beijing (China). LASG, Institute of Atmospheric Physics; Chinese Academy of Sciences (CAS), Beijing (China). Climate Change Research Center; Nanjing Univ. (China). Institute for Climate and Global Change Research & School of Atmospheric Sciences
  2. Chinese Academy of Sciences (CAS), Beijing (China). LASG, Institute of Atmospheric Physics; Chinese Academy of Sciences (CAS), Beijing (China). Climate Change Research Center
  3. Nanjing Univ. (China). Institute for Climate and Global Change Research & School of Atmospheric Sciences; Collaborative Innovation Center of Climate Change, Jiangsu Province (China); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
OSTI Identifier:
1221466
Report Number(s):
PNNL-SA--110320
Journal ID: ISSN 1748-9326; KP1703020
Grant/Contract Number:
AC06-76RL01830
Type:
Accepted Manuscript
Journal Name:
Environmental Research Letters
Additional Journal Information:
Journal Volume: 10; Journal Issue: 7; Journal ID: ISSN 1748-9326
Publisher:
IOP Publishing
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES EASM; cloud radiative heating; numerical experiments