Impacts of uncertain cloud-related parameters on Pacific Walker circulation simulation in GAMIL2

To investigate the impacts of uncertain parameters on simulated Pacific Walker circulation (PWC), a large number of perturbed parameter simulations are conducted using GAMIL2 (the Grid-point Atmospheric Model of IAP/LASG, version 2), and three different PWC indices are selected. The results show tha...

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Bibliographic Details
Published in:Atmospheric and oceanic science letters = Daqi-he-haiyang-kexue-kuaibao 2018-01, Vol.11 (1), p.7-14
Main Authors: XIE, Feng, LI, Li-Juan, WANG, Bin, XUE, Wei
Format: Article
Language:English
Subjects:
cloud-related parameters
Clouds
Convection
GAMIL2
GAMIL2, diabatic heating
Heating
Meteorology
Ocean circulation
Ocean-atmosphere interaction
Pacific
Parameters
Simulation
uncertainty
Vertical motion
Walker circulation
不确定性
云相关参数
太平洋沃克环流
非绝热加热
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Summary:To investigate the impacts of uncertain parameters on simulated Pacific Walker circulation (PWC), a large number of perturbed parameter simulations are conducted using GAMIL2 (the Grid-point Atmospheric Model of IAP/LASG, version 2), and three different PWC indices are selected. The results show that the influences of some parameters on PWC are dependent on the selected index - a finding supported by the inconsistent responses of different indexes to these parameters. Among the nine parameters, the RH threshold for deep convection (RHCRIT) is the most sensitive in simulating PWC. Increased RHCRIT weakens deep convective heating and stratiform cooling, and strengthens shallow convective heating. Further analysis reveals that uncertain parameters affect the simulated PWC through changing the diabatic heating and vertical motion.
ISSN:1674-2834
2376-6123
DOI:10.1080/16742834.2018.1392228