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Improved Simulation of East Asian Summer Monsoon in the High-resolution CESM1 and Its Causes

Journal Article · · Advances in Atmospheric Sciences
 [1];  [2];  [2];  [2];  [3];  [4];  [1];  [2]
  1. Ocean Univ. of China, Qingdao (China)
  2. Ocean Univ. of China, Qingdao (China); Laoshan Laboratory, Qingdao (China)
  3. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  4. Laoshan Laboratory, Qingdao (China)
+ Show Author Affiliations
Based on the high- and low-resolution Community Earth System Model, version 1 (CESM1), and corresponding simulations from phase 6 of the Coupled Model Intercomparison Project (CMIP6), we compare the interannual variability of the East Asian summer monsoon (EASM). The EASM interannual variability is characterized by the anomalous western North Pacific anticyclone (WNPAC) circulation and the dipole rainfall pattern with a negative southern lobe over the western North Pacific and a positive northern lobe along the Meiyu–Baiu region, which is better reproduced by the high-resolution models. Here, the reason for the improvement in the high-resolution models has been attributed to the better simulation of the warm temperature advection from the wind anomalies on the climatological temperature gradient. Positive sea surface temperature (SST) anomalies over the tropical Indian Ocean are the key to the improved wind anomalies featuring a WNPAC in the high-resolution models. The warm SST anomalies over the tropical Indian Ocean strengthen the WNPAC by triggering a Kelvin-wave response to the enhanced heat release induced by the increased precipitation. Based on the mixed-layer heat budget analysis, the warm SST anomalies over the western Indian Ocean in the high-resolution CESM1 are tied to the anomalous easterly wind along the equator, which reduces surface evaporation and upwelling. Therefore, the better simulations of air-sea feedback and the oceanic mesoscale eddy over the western Indian Ocean are the key for the improved simulation of the EASM interannual variations in the high-resolution CESM1.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2571479
Report Number(s):
PNNL-SA--212773
Journal Information:
Advances in Atmospheric Sciences, Journal Name: Advances in Atmospheric Sciences Journal Issue: 6 Vol. 42; ISSN 0256-1530; ISSN 1861-9533
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (11)

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Related Subjects

54 ENVIRONMENTAL SCIENCES
CESM1
East Asian summer monsoon
Interannual variability
Western Indian Ocean
model resolution