DOI: 10.1002/jgrd.50337
论文题名: Influence of summer monsoon diurnal cycle on moisture transport and precipitation over eastern China
作者: Chen G. ; Sha W. ; Sawada M. ; Iwasaki T.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 8 起始页码: 3163
结束页码: 3177
语种: 英语
英文关键词: diurnal variation
; moisture transport
; monsoon diurnal cycle
; precipitation
; summer monsoon
Scopus关键词: Lasers
; Moisture
; Precipitation (chemical)
; Rain
; Diurnal cycle
; Diurnal variability
; Diurnal variation
; Moisture transport
; Morning rainfall
; Radiosonde observations
; Regional climate
; Summer monsoon
; Atmospheric thermodynamics
; atmospheric convection
; data set
; diurnal variation
; mesoscale meteorology
; moisture transfer
; monsoon
; precipitation (climatology)
; summer
; timescale
; water budget
; China
英文摘要: Diurnal variability of the summer monsoon over China, a key element affecting regional climate, is examined using the latest reanalysis dataset and satellite rain estimates. Diurnal variation of low-level wind is found to be pronounced over South China during active monsoon days. Mean wind speed attains a maximum (minimum) in early morning (afternoon), with a diurnal range of 2-3 m/s, double that of inactive monsoon days. The largest amplitude typically appears at 850 hPa, consistent with radiosonde observations. Such a monsoon diurnal cycle can strengthen low-level moisture transport at night by about 20% more than during the day. Nocturnal moisture fluxes converge toward Central China and lead to a meso-synoptic-scale moisture sink during the late night and morning, which plays a role in regulating the regional water budget on a diurnal time scale. Monsoon flow also helps provide substantial moisture over low-lying areas in the morning hours. Correspondingly, morning rainfall undergoes a remarkable increase and greatly contributes to the diurnal cycle of summer rainfall. The strongest response comes from meso-α-scale rain events that not only become prominent during active monsoon days but also possess a dominant morning peak. These morning events occur mainly on the basins and plains of Central China, where the monsoon diurnal cycle promotes nighttime mesoscale convection. These tend to shift northward from June to August, with the progress of the monsoon diurnal cycle, thereby producing the morning-peak summer rainband. The findings point to an efficiency of nocturnal monsoon flow influencing the warm-season weather and climate over eastern China. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63820
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Geophysics, Graduate School of Science, Tohoku University, A519, Physics A, 6-3, Aoba, Aramaki, Aoba, Sendai, Miyagi 980-8578, Japan; Atmosphere and Ocean Research Institute, University of Tokyo, Tokyo, Japan
Recommended Citation:
Chen G.,Sha W.,Sawada M.,et al. Influence of summer monsoon diurnal cycle on moisture transport and precipitation over eastern China[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(8)