TY - JOUR
T1 - Mesoscale Convective Systems Dominate the Energetics of the South Asian Summer Monsoon Onset
AU - Chen, Xingchao
AU - Leung, L. Ruby
AU - Feng, Zhe
AU - Song, Fengfei
AU - Yang, Qiu
N1 - Funding Information:
The authors are supported by the Office of Science of DOE Biological and Environmental Research as part of the Regional and Global Modeling and Analysis program area. PNNL is operated for DOE by Battelle Memorial Institute under contract DE-AC05-76RL01830. The computations were mainly carried out using the computing resources at the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility located at Lawrence Berkeley National Laboratory, operated under Contract No. DE-AC02-05CH11231. Analyses of the model output were partially carried out with the computing resources at the Texas Advanced Computing Center (TACC).
Funding Information:
The authors are supported by the Office of Science of DOE Biological and Environmental Research as part of the Regional and Global Modeling and Analysis program area. PNNL is operated for DOE by Battelle Memorial Institute under contract DE‐AC05‐76RL01830. The computations were mainly carried out using the computing resources at the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility located at Lawrence Berkeley National Laboratory, operated under Contract No. DE‐AC02‐05CH11231. Analyses of the model output were partially carried out with the computing resources at the Texas Advanced Computing Center (TACC).
Publisher Copyright:
© 2021. American Geophysical Union. All Rights Reserved.
PY - 2021/9/16
Y1 - 2021/9/16
N2 - The rapid onset of the South Asian summer monsoon (SASM) is featured as an abrupt increase of rainfall and atmospheric column-integrated moist static energy (MSE). Using convection-permitting simulations, a novel cloud tracking technique, and an MSE budget, the relative roles of mesoscale convective systems (MCSs) and non-MCS deep convection in the SASM onset energetics are studied. The analysis shows MCSs greatly contribute to the sudden increases of rainfall, diabatic MSE sources, and the subsequent enhanced export of column-integrated MSE during the rapid onset phase. A “diabatic sources-energy export” plane analysis delineates the different roles of MCSs and non-MCS deep convection. Although deep convection always leads to a net energy export, mesoscale organization of deep convection dominates the convection-associated positive feedbacks that accelerate the energy cycle of the SASM onset. Sensitivity experiment shows that the results are insensitive to the model resolutions.
AB - The rapid onset of the South Asian summer monsoon (SASM) is featured as an abrupt increase of rainfall and atmospheric column-integrated moist static energy (MSE). Using convection-permitting simulations, a novel cloud tracking technique, and an MSE budget, the relative roles of mesoscale convective systems (MCSs) and non-MCS deep convection in the SASM onset energetics are studied. The analysis shows MCSs greatly contribute to the sudden increases of rainfall, diabatic MSE sources, and the subsequent enhanced export of column-integrated MSE during the rapid onset phase. A “diabatic sources-energy export” plane analysis delineates the different roles of MCSs and non-MCS deep convection. Although deep convection always leads to a net energy export, mesoscale organization of deep convection dominates the convection-associated positive feedbacks that accelerate the energy cycle of the SASM onset. Sensitivity experiment shows that the results are insensitive to the model resolutions.
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U2 - 10.1029/2021GL094873
DO - 10.1029/2021GL094873
M3 - Article
AN - SCOPUS:85114742341
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 17
M1 - e2021GL094873
ER -