Sensitivity of Kelvin waves and Madden-Julian oscillation to convective downdrafts in the NCAR-CAM3

被引：9
|
作者：
Mishra, Saroj K. [1 ,2 ]
Sahany, Sandeep [3 ]
机构：
[1] Natl Ctr Atmospher Res NCAR, Inst Math Appl Geosci IMAGe, Boulder, CO 80305 USA
[2] Univ Colorado, Dept Comp Sci, Boulder, CO 80309 USA
[3] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA
来源：
ATMOSPHERIC SCIENCE LETTERS | 2011年 / 12卷 / 03期
关键词：
global climate model; convective downdrafts; Kelvin waves; Madden-Julian oscillation; tropical meteorology; INTRASEASONAL VARIABILITY; CIRCULATION MODEL; MJO; PARAMETERIZATION; SIMULATIONS;
D O I：
10.1002/asl.334
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Using NCAR-Community Atmosphere Model version 3 (CAM3), the sensitivity of Kelvin waves (KWs) and Madden-Julian Oscillation (MJO) simulation to convective downdrafts is examined. For this, numerical simulations are carried out by changing the downdraft intensity. Increase in the intensity of convective downdrafts in the model leads to greater re-evaporation of precipitation, which enhances the moisture in the lower troposphere, with a corresponding increase in the convective available potential energy ( CAPE). Stronger downdrafts, and hence enhanced CAPE, are found to be more favorable for low frequency variability and less favorable for the higher frequencies, leading to stronger MJO and weaker KWs. Copyright (C) 2011 Royal Meteorological Society
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页码：281 / 287
页数：7
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