Numerical simulation for the coupling effect of local atmospheric circulations over the area of Beijing,Tianjin and Hebei Province |
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| Authors: | ShuHua Liu ZhenXin Liu Ju Li YinChun Wang YanJun Ma Li Sheng HePing Liu FuMing Liang GuoJun Xin JianHua Wang |
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| Institution: | (1) Department of Atmospheric Sciences, School of Physics, Peking University, Beijing, 100871, China;(2) Institute of Beijing Urban Meteorology, China Meteorological Administration, Beijing, 100089, China;(3) Institute of Shenyang Atmospheric Environment, China Meteorological Administration, Shenyang, 110016, China;(4) Department of Physics, Atmospheric Sciences & General Science, Jackson State University, P. O. Box 17660, Jackson, MS 39217-0195, USA |
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| Abstract: | Using the model system MM5.V3 and multi-layer grid nesting technique, we have done a multi-scale numerical simulation over
the area of Beijing, Tianjin and Hebei Province to analyze the temperature and wind field there and study its local circulations.
The results show a coupling effect of Urban Heat Island Circulation (UHIC), Mountain Valley Breeze (MVB) and Sea Land Breeze
(SLB) occurs in this area when the synoptic system is weak. The SLB can penetrate deep into the mainland for about 200 km
when it is blooming. MVB can extend to south and cover almost the whole plain area in Beijing. Both MVB and SLB are diurnal
periodical; meanwhile the phase of MVB drops behind that of SLB for about six hours. As a local circulation, the UHIC weakens
the two circulations above, and it also has a diurnal period. As a result, the coupling effect of circulations reveals not
only different features in spring-summer period and autumn-winter period in a year but also the difference between early morning
to noonday and afternoon to night in a day. We noted the diffusion of contamination over the area around Beijing, and found
the steady presence of a transport routine of contamination over North-China throughout the year caused by the Coupling Effect
mentioned above. This find is important for studying the environment pollution in this area.
Supported by Central Public Welfare Special Fund Program for the Institute and Higher Education (Grant No. IUMKY200701), Public
Welfare Special Fund Program (Meteorology) of China Scientific and Technological Ministry (Grant Nos. CYHY20080620, CYHY200706004),
Spread New Technology Program of China Meteorological Administration (Grant No. CMATG2007M15) and Urban Meteorology Scientific
Research Fund Program of the Institute of Beijing Urban Meteorology, China Meteorological Administration (Grant No. UMRF200702) |
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| Keywords: | Beijing-Tianjin-Hebei Mountain Valley Breeze Sea Land Breeze urban heat island circulation numerical simulation |
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