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The Generant Disciplinarian of Drought and Waterlog in North China and the Relativity between Arctic Sea-Ice and Summer Rainfall in North China

Author: XieFuYing
Tutor: HeJinHai
School: Nanjing Institute of Meteorology
Course: Meteorology
Keywords: Summer Rainfall in North Circulation features Sea ice anomalies Hudson Bay Related
CLC: P426.616
Type: Master's thesis
Year: 2003
Downloads: 148
Quote: 0
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Abstract


Abnormal regulation and reasons for the study of the North China summer rainfall , a detailed analysis of the climatic characteristics of summer precipitation in North China , as well as pre- and the same period of low, medium and high-level circulation features . Also analyzed the characteristics of the North China summer rainfall anomalies in the physical field . Subsequently focuses on Arctic sea ice and the North China summer rainfall anomalies in the relationship , and to explore the sea ice affect the mechanism of Summer Precipitation in North by analysis of sea ice anomalies caused by abnormal atmospheric circulation . Come to the following conclusions : (1) the summer precipitation in North China has obvious interannual and decadal changes . North China summer rainfall anomalies and anomalies are closely related to the continued circulation from spring to summer . These anomaly appears : drought (flood) years Mongolian high pressure anomaly on the strong side (weak ) , India 's thermal low pressure to establish late (early) and weak ( strong ) , strong (weak ) Lake Baikal blocking high , weak Asian summer monsoon ( strong), the West Pacific subtropical high southerly ( North) , east ( West) . In addition , the North China drought (flood) a year earlier , lower physical field configuration is not conducive to (help ) precipitation formation . (2) The summer precipitation in North China was negatively correlated with the Hudson Bay sea ice from May to August . The sea ice of the sea and the Asian monsoon is negatively correlated with the strength of the West Pacific subtropical high is also a negative correlation , while the west end of the ridge of the subtropical high was positively correlated . Which Minha Sun Wanhai ice by the two systems to influence the Summer Precipitation in North . This is good proof in the field of the analysis of the circulation of sea ice anomalies Year . ( 3) Hudson Sun Wanhai ice also have a significant impact on high-latitude circulation . In the sea ice anomalies caused the exception of the high - latitude circulation exists between the polar region and the Eurasian high latitudes anomaly wave Column , its centers are located in the polar regions ( around Greenland ) , East Siberia , the North Pacific . This wave train will affect precipitation in North China . Same time Hudson the number of sea ice in Sun Bay May cause Greenland and its surrounding region height field abnormalities, such anomalies continued from spring to summer . Such abnormal effects of precipitation in North China .

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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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