DOI: 10.1002/2013JD020072
论文题名: Analysis of the vertical structure of the atmospheric heating process and its seasonal variation over the Tibetan Plateau using a land data assimilation system
作者: Seto R. ; Koike T. ; Rasmy M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 22 起始页码: 12403
结束页码: 12421
语种: 英语
英文关键词: Atmosphric heating
; land data assimilation
; Radiosonde
; Tibetan Plateau
Scopus关键词: Atmospheric structure
; Atmospheric thermodynamics
; Cooling
; Data processing
; Radiosondes
; Troposphere
; Atmospheric heating process
; Horizontal advection
; Land data assimilation
; Land data assimilation systems
; Meso-scale modeling
; Microwave brightness temperature
; Three-layered structures
; Tibetan Plateau
; Heating
; brightness temperature
; cooling
; data assimilation
; data set
; disturbance
; heating
; radiosonde
; regional climate
; seasonal variation
; seasonality
; troposphere
; vertical distribution
; warming
; China
; Qinghai-Xizang Plateau
英文摘要: The atmospheric heating process over the Tibetan Plateau (TP) in the premonsoon and mature monsoon seasons of 2008 and 2009 was investigated using radiosonde data and a land data assimilation system coupled with a mesoscale model (LDAS-A), which assimilates microwave brightness temperature and accurately reproduces land and atmospheric states. Focusing on the temperature observed below 200 hPa, we found that there were warming and cooling periods alternately in the premonsoon season within a general warming trend, and the profiles of heating in the two seasons were reversed. Then we identified the vertical structure of each heating component: sensible heat (SH), latent heat (LH), and horizontal advection (Hadv), using the LDAS-A in each season. The troposphere over the TP in warming periods was divided into three vertical layers in terms of the major heating process: SH transport below 450 hPa, LH from 450 to 250 hPa, and Hadv above 250 hPa. The SH and LH are transported by local convections. In contrast, the heat source for Hadv originated in the southwest of the plateau, related to synoptic-scale circulations. Latent cooling with cloud evaporation and adiabatic cooling with convection negatively contributed to heating in the upper troposphere. In cooling periods, the vertical structure of each heating component was similar to that in warming periods, but net heating was reversed because of the influence of synoptic-scale disturbances. In the mature monsoon season, warm Hadv in the upper troposphere rapidly weakened in response to the initial formation of the Tibetan High. Key Points Atmospheric heating over the Tibetan Plateau is examined using new data The profile of heat processes develops a three-layered structure in premonsoon Heating profile varies seasonally and is affected by synoptic-scale disturbance ©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/63155
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 Civil Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo 113-8656 Tokyo, Japan
Recommended Citation:
Seto R.,Koike T.,Rasmy M.. Analysis of the vertical structure of the atmospheric heating process and its seasonal variation over the Tibetan Plateau using a land data assimilation system[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(22)