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Research on Extreme Heavy Precipitation Event Characteristic and Analysis of Causes

Author: YangJinHu
Tutor: JiangZhiHong
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: China Extreme precipitation events Temporal and spatial variation Influence Mechanism
CLC: P426.616
Type: Master's thesis
Year: 2007
Downloads: 420
Quote: 1
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Abstract


China 1955-2004 314 stations daily precipitation data, and NCAR / NCEP height field, wind field, sea level pressure field of nearly 50a coming year than the wet surface pressure, as well as NOAA reconfigurable Pacific SST data of Extreme Precipitation The non-uniformity of the distribution characteristics of the spatial and temporal characteristics of the event, year of diagnosis, and eastern China summer extreme precipitation events may affect mechanism results show that: (1) the average spatial distribution of Chinese annual extreme precipitation events very large regional differences, JAC, northern Hunan, Sichuan, southwest Tibet and western Xinjiang reverse variation with other regional trend of China's annual extreme the abnormal precipitation events space modal; while the regional extreme precipitation events change and mutation characteristics are very different. China's annual extreme precipitation events focused performance with the average concentration of the space from the northwest to the southeast as \the higher the concentration of another year of extreme heavy precipitation events, the annual precipitation is the less, and vice versa, and the poor correlation between the concentrated period of the same year precipitation. (3) before the winter and the equatorial central and eastern Pacific that affect the critical region of North China summer extreme heavy precipitation events, in winter the central and eastern equatorial Pacific unusually warm years, the same period in the winter and late spring equatorial eastern Pacific performance anomalies updraft, so that the performance of the Middle East and the Pacific unusually strong Hadley circulation, and forced 500hpa height field performance of the PNA teleconnection late summer performance for WP teleconnection, so enhanced from winter to late summer West Pacific high strength, area increases, the westward extension of the boundary Yuexi southerly winds, and late summer in North China is prone to extreme precipitation events; with northerly winds Interchange, and vice versa. (4) the previous winter tropical western Pacific affect the critical region of the northeast and the southern summer extreme precipitation events, the anomaly in the the winter western tropical Pacific warm years, from winter to summer in low latitudes showed abnormal updraft, the performance of the mid to high latitudes for abnormal downdraft, while the lower prevalence of abnormal northerly winds, high prevalence of abnormal southerly winds, this anticyclonic vertical circulation will enhance winter East Asian winter monsoon strength and weaken late four distinct seasons and enjoys pleasant EASM strength, making the late summer moisture transport only arrived in China's eastern region south of the Yangtze River, China's northeast region, the westerly flow, there is no adequate source of water vapor summer abnormal extreme heavy precipitation events less than normal, while extremely heavy precipitation events in the area south of the Yangtze River to the high side, and vice versa.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Meteorological elements,atmospheric phenomenon > Water vapor,condensation,and precipitation > Precipitation > Ordinary precipitation > Precipitation caused by the disaster
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