Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0340.1 |
Forcing of the Upper-Tropospheric Monsoon Anticyclones | |
Siu, Leong Wai; Bowman, Kenneth P. | |
2019-07-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:7页码:1937-1954 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | During the boreal warm season (May-September), the circulation in the upper troposphere and lower stratosphere is dominated by two large anticyclones: the Asian monsoon anticyclone (AMA) and North American monsoon anticyclone (NAMA). The existence of the AMA has long been linked to Asian monsoon precipitation using the Matsuno-Gill framework, but the origin of the NAMA has not been clearly understood. Here the forcing mechanisms of the NAMA are investigated using a simplified dry general circulation model. The simulated anticyclones are in good agreement with observations when the model is forced by a zonally symmetric meridional temperature gradient plus a realistic geographical distribution of heating based on observed tropical and subtropical precipitation in the Northern Hemisphere. Model experiments show that the AMA and NAMA are largely independent of one another, and the NAMA is not a downstream response to the Asian monsoon. The primary forcing of the NAMA is precipitation in the longitude sector between 60 degrees and 120 degrees W, with the largest contribution coming from the subtropical latitudes within that sector. Experiments with idealized regional heating distributions reveal that the extratropical response to tropical and subtropical precipitation depends approximately linearly on the magnitude of the forcing but nonlinearly on its latitude. The AMA is stronger than the NAMA, primarily because precipitation in the subtropics over Asia is much heavier than at similar latitudes in the Western Hemisphere. |
英文关键词 | Atmospheric circulation Large-scale motions Planetary waves Monsoons |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000472082200001 |
WOS关键词 | NORTH-AMERICAN ; INTERANNUAL VARIABILITY ; TROPICAL ATMOSPHERE ; SUMMER MONSOON ; CIRCULATION ; ORIGIN ; HEAT ; DRIVEN ; REGIME ; MODEL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184737 |
专题 | 地球科学 |
作者单位 | Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA |
推荐引用方式 GB/T 7714 | Siu, Leong Wai,Bowman, Kenneth P.. Forcing of the Upper-Tropospheric Monsoon Anticyclones[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(7):1937-1954. |
APA | Siu, Leong Wai,&Bowman, Kenneth P..(2019).Forcing of the Upper-Tropospheric Monsoon Anticyclones.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(7),1937-1954. |
MLA | Siu, Leong Wai,et al."Forcing of the Upper-Tropospheric Monsoon Anticyclones".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.7(2019):1937-1954. |
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