DOI: 10.1175/JCLI-D-13-00456.1
Scopus记录号: 2-s2.0-84902105440
论文题名: Impact of the middle and upper tropospheric cooling over central Asia on the summer rainfall in the Tarim Basin, China
作者: Zhao Y. ; Huang A. ; Zhou Y. ; Huang D. ; Yang Q. ; Ma Y. ; Li M. ; Wei G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 12 起始页码: 4721
结束页码: 4732
语种: 英语
Scopus关键词: Climatology
; Cooling
; Storms
; Troposphere
; Asian summer monsoons
; Atmospheric circulation
; Atmospheric response
; Diabatic heating
; Favorable conditions
; Mechanism analysis
; Summer rainfall
; Upper troposphere
; Rain
; advection
; atmospheric circulation
; cooling
; cyclone
; diabatic process
; jet stream
; monsoon
; rainfall
; summer
; trend analysis
; troposphere
; westerly
; wind
; Central Asia
; China
; Tarim Basin
; Xinjiang Uygur
英文摘要: The changes in summer rainfall over the Tarim Basin, China, and the underlying mechanisms have been investigated using the observed rainfall data at 34 stations and the NCEP-NCAR reanalysis data during the period of 1961-2007. Results show that the summer rainfall over the Tarim Basin, which exhibits a significant increasing trend during the last half century, is closely related to the summer middle and upper tropospheric cooling over central Asia. Mechanism analysis indicates that the middle and upper tropospheric cooling over central Asia results in a location farther south of the subtropical westerly jet over western and central Asia with anomalous southerly wind at lower levels and ascending motion prevailing over the Tarim Basin. Such anomalies in the atmospheric circulations provide favorable conditions for the enhanced summer rainfall over the Tarim Basin. Further analysis suggests that the weakened South Asian summer monsoon (SASM) could be potentially responsible for the middle and upper tropospheric cooling over central Asia. This is largely through the atmospheric responses to the diabatic heating effect of the SASM. A weakened SASM can result in an anomalous cyclone in the middle and upper troposphere over central Asia. The western part of the anomalous cyclone produces more cold air advection, which leads to the cooling. This study suggests indirect but important effects of the SASMon the summer rainfall over the Tarim Basin. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51308
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Desert Meteorology, China Meteorological Administration, Urumqi, Xinjiang, China; School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu, China; Institute of Desert Meteorology, China Meteorological Administration, Urumqi, Xinjiang, China
Recommended Citation:
Zhao Y.,Huang A.,Zhou Y.,et al. Impact of the middle and upper tropospheric cooling over central Asia on the summer rainfall in the Tarim Basin, China[J]. Journal of Climate,2014-01-01,27(12)