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
引用
收藏
页码:281 / 287
页数:7
相关论文
共 50 条
  • [1] Oceanic Kelvin waves and the Madden-Julian oscillation
    Hendon, HH
    Liebmann, B
    Glick, JD
    JOURNAL OF THE ATMOSPHERIC SCIENCES, 1998, 55 (01) : 88 - 101
  • [2] Effects of convective scale downdrafts on the rainfall simulation in NCAR-CAM3
    Sahany, Sandeep
    Mishra, Saroj K.
    THEORETICAL AND APPLIED CLIMATOLOGY, 2012, 107 (3-4) : 547 - 562
  • [3] Effects of convective scale downdrafts on the rainfall simulation in NCAR-CAM3
    Sandeep Sahany
    Saroj K. Mishra
    Theoretical and Applied Climatology, 2012, 107 : 547 - 562
  • [4] Fast and slow Kelvin waves in the Madden-Julian Oscillation of a GCM
    Matthews, AJ
    Slingo, JM
    Hoskins, BJ
    Inness, PM
    QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, 1999, 125 (557) : 1473 - 1498
  • [5] Tropical Cyclogenesis Associated with Kelvin Waves and the Madden-Julian Oscillation
    Schreck, Carl J., III
    Molinari, John
    MONTHLY WEATHER REVIEW, 2011, 139 (09) : 2723 - 2734
  • [6] Sensitivity of Linear Models of the Madden-Julian Oscillation to Convective Representation
    Fuchs-Stone, Zeljka
    Emanuel, Kerry
    JOURNAL OF THE ATMOSPHERIC SCIENCES, 2022, 79 (06) : 1575 - 1584
  • [7] Transforming circumnavigating Kelvin waves that initiate and dissipate the Madden-Julian Oscillation
    Haertel, Patrick
    Straub, Katherine
    Budsock, Andrew
    QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, 2015, 141 (690) : 1586 - 1602
  • [8] Structure of the Madden-Julian Oscillation in the Superparameterized CAM
    Benedict, James J.
    Randall, David A.
    JOURNAL OF THE ATMOSPHERIC SCIENCES, 2009, 66 (11) : 3277 - 3296
  • [9] The Role of Convective Moistening in the Madden-Julian Oscillation
    Thayer-Calder, Katherine
    Randall, David A.
    JOURNAL OF THE ATMOSPHERIC SCIENCES, 2009, 66 (11) : 3297 - 3312
  • [10] Observed three dimensional structure of the Madden-Julian oscillation and convectively coupled Kelvin waves
    Kiladis, GN
    Harris, KA
    Mapes, BE
    Wheeler, M
    24TH CONFERENCE ON HURRICANES AND TROPICAL METEOROLOGY/10TH CONFERENCE ON INTERACTION OF THE SEA AND ATMOSPHERE, 2000, : 47 - 48