Drastic Evening Increase in Precipitable Water Vapor over the Southeastern Tibetan Plateau

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概要

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• A drastic increase in precipitable water vapor (PWV) in the evenings was repeatedly confirmed in October 2000, by an analysis of GPS observational data at Lhasa in the southeastern Tibetan Plateau, China. In order to investigate its mechanism, a numerical simulation was performed for a typical day using a regional atmospheric model. During the daytime, moisture is transported toward the summits of the Himalayas from the Hindustan plain along the southern slope of the mountain range by thermally-induced upslope winds. The moist air mass penetrates the Tibetan Plateau, through some cols of the Himalayas. Moisture accumulates over the northern foot of the Himalayas. Then a horizontal gradient of moisture increases north of the Himalayas, and a stationary moisture front forms between the moist air mass and dry air on the Tibetan Plateau. In the evening, the frontal structure begins to gradually decay until the midnight, and a large amount of moisture bursts toward the inner Tibetan Plateau in the lower atmosphere as a gravity current, causing a rapid increase in PWV. It is speculated, therefore, that the drastic evening increase in PWV, extending widely along the Himalayas, is generated by the plateau scale diurnal wind induced by the thermal effects between the Tibetan Plateau and the Hindustan plain. During the following day, the PWV level decreases over a wide area of the inner Tibetan Plateau, since dry air advection is intensified in the lower atmosphere by the synoptic scale westerly winds, because of the growth of the mixed layer accompanied by the vertical transportation of momentum.

• 社団法人日本気象学会の論文
• 2003-10-27

著者

• Yoshikane T

  Univ. Tsukuba Tsukuba Jpn

• Yoshikane Takao

  Frontier Research Center For Global Change Japan Agency For Marine-earth Science And Technology

• KIMURA Fujio

  Institute of Life and Environmental Sciences, University of Tsukuba

• SASAKI Taichi

  Frontier Observational Research System for Global Change

• WU Peiming

  Frontier Observational Research System for Global Change

• LIU Jingmiao

  Chinese Academy of Meteorological Sciences

• Kimura Fujio

  Institute Of Geoscience University Of Tsukuba

• Kimura Fujio

  Institute Of Geoscience University Of Tsukuba:frontier Research System For Global Change

• Yoshikane Takao

  Frontier Research Center for Global Change (FRCGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

関連論文

• Assessment of the Diurnal Cycle of Precipitation over the Maritime Continent Simulated by a 20km Mesh GCM Using TRMM PR Data(5. Application to NWP Models,Precipitation Measurements from Space)
• Resolution Dependency of the Diurnal Cycle of Convective Clouds over the Tibetan Plateau in a Mesoscale Model(The International Workshop on High-Resolution and Cloud Modeling, 2006)
• Formation Mechanism of an Intensified Cold Air Mass in the Middle Troposphere over East Siberia in December 2005 Using a Regional Climate Model
• Drastic Evening Increase in Precipitable Water Vapor over the Southeastern Tibetan Plateau
• Numerical Study on the Baiu Front Genesis by Heating Contrast between Land and Ocean
• Coupling a Single-Layer Urban Canopy Model with a Simple Atmospheric Model : Impact on Urban Heat Island Simulation for an Idealized Case

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