GSTDTAP  > 地球科学
DOI10.1175/JAS-D-17-0309.1
Moisture and Moist Static Energy Budgets of South Asian Monsoon Low Pressure Systems in GFDL AM4.0
Adames, Angel F.1,2,3; Ming, Yi1
2018-06-01
发表期刊JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN0022-4928
EISSN1520-0469
出版年2018
卷号75期号:6页码:2107-2123
文章类型Article
语种英语
国家USA
英文摘要

The mechanisms that lead to the propagation of anomalous moisture and moist static energy (MSE) in monsoon low and high pressure systems, collectively referred to as synoptic-scale monsoonal disturbances (SMDs), are investigated using daily output fields from GFDL's atmospheric general circulation model, version 4.0 (AM4.0). On the basis of linear regression analysis of westward-propagating rainfall anomalies of time scales shorter than 15 days, it is found that SMDs are organized into wave trains of three to four individual cyclones and anticyclones. These events amplify over the Bay of Bengal, reach a maximum amplitude over the eastern coast of India, and dissipate as they approach the Arabian Sea. The structure and propagation of the simulated SMDs resemble those documented in observations. It is found that moisture and MSE anomalies exhibit similar horizontal structures in the simulated SMDs, indicating that moisture is the leading contributor to MSE. Propagation of the moisture anomalies is governed by vertical moisture advection, while the MSE anomalies propagate because of horizontal advection of dry static energy by the anomalous winds. By combining the budgets, we interpret the propagation of the moisture anomalies in terms of lifting that is forced by horizontal dry static energy advection, that is, ascent along sloping isentropes. This process moistens the lower free troposphere, producing an environment that is more favorable to deep convection. Ascent driven by radiative heating is of primary importance to the maintenance of the moisture anomalies.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000434942300019
WOS关键词MADDEN-JULIAN OSCILLATION ; BAROCLINIC INSTABILITY ; PROPAGATION CHARACTERISTICS ; INTRASEASONAL OSCILLATION ; COMPOSITE STRUCTURE ; GLOBAL ATMOSPHERE ; SUMMER MONSOON ; SCALE WAVES ; DEPRESSIONS ; MJO
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/29239
专题地球科学
作者单位1.NOAA, Geophys Fluid Dynam Lab, Princeton, NJ 08540 USA;
2.Univ Corp Atmospheric Res, Boulder, CO USA;
3.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA
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Adames, Angel F.,Ming, Yi. Moisture and Moist Static Energy Budgets of South Asian Monsoon Low Pressure Systems in GFDL AM4.0[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(6):2107-2123.
APA Adames, Angel F.,&Ming, Yi.(2018).Moisture and Moist Static Energy Budgets of South Asian Monsoon Low Pressure Systems in GFDL AM4.0.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(6),2107-2123.
MLA Adames, Angel F.,et al."Moisture and Moist Static Energy Budgets of South Asian Monsoon Low Pressure Systems in GFDL AM4.0".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.6(2018):2107-2123.
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