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Northwest Normal University (西北师范大学) 2015

Spatio-temporal Changes And The Cause Analysis of Meteorological Drought in North China from 1961 to 2013

周丹

Titre : Spatio-temporal Changes And The Cause Analysis of Meteorological Drought in North China from 1961 to 2013

Auteur : 周丹

Grade : Master’s Theses 2015

Université : Northwest Normal University (西北师范大学)

Résumé partiel
Drought is natural disasters on earth which has broader space, longer duration and the worst socioeconomic and environmental impacts. Economic losses caused by drought accounted for 50% of all natural disasters in China, which is the primacy of meteorological disasters. North China is not only China’s political, economic and cultural center, but also an important grain production base in China, while the region belongs to warm temperate semi-arid and semi-humid monsoon climate, uneven distribution of precipitation, interannual variability, which makes meteorological drought frequency rank first in the country. From 1980 s until now, the drought is growing in North China. Since the late 1990 s, successive droughts came, which has become an important limiting factor for the steady increase in food production of this area. In order to alleviate the impact of meteorological drought on crops, the extraction of groundwater for irrigation in North China has become the main measure for drought-resistant capacity. A large area of extraction of groundwater, resulting in the rapid decline in groundwater levels caused severe hydrological drought. Based on this, the present study is to analyze meteorological drought composite index(CI), standardized precipitation evapotranspiration index(SPEI), standardized precipitation index(SPI), the applicability of precipitation Z index in North China region, select the appropriate drought index, using 69 meteorological stations data from 1961 to 2013, analyze the different time scales in North China, different seasons, different age occasion, different levels of spatio-temporal variation of meteorological drought and strength characteristics. Analyze the main causes of meteorological drought in North China from the three aspects such as geographical features, changes in atmospheric circulation and global change.

Mots clés : North China ;meteorological drought ;temporal and spatial variability ;standardized precipitation evapotranspiration index ;cause analysis

Présentation (CNKI)

Page publiée le 15 avril 2022