| Study on the determination of meteorological drought index and drought climate changes in Shanxi Province |
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| DOI：10.7606/j.issn.1000-7601.2010.03.44 |
| Key Words: meteorological drought index inter-decadal changes inter-annual changes Shanxi |
| Author Name | Affiliation | | ZHOU Jinhong | Atmospheric Science Institute, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, China
Taiyuan Meteorological Bureau, Taigyuan, Shanxi 030082, China | | LI Liping | Atmospheric Science Institute, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, China | | QIN Aimin | Shanxi Meteorological Bureau, Taiyuan, Shanxi 030002, China |
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| Abstract: |
| Based on 62 meteorological stations' seasonal and annual precipitation data during 1961~2008 in Shanxi
Province，three meteorological drought indexes are compared and Z index is modified, so seasonal and annual drought in-dexes for certain stations and Shanxi area are established. The research results show that there is one year of severe drought, four years of heavy drought and three years of slight drought in recent 48 years in Shanxi; The year of severe drought emerged in the mid 1960s, while most of years of heavy and slight drought emerged after the mid 1980s; The years of severe drought in winter and spring emerged separately in the early 1960s and in the late 1990s to the early 21st century, while years of severe drought in summer and autumn emerged in the late 1990s. Uniformly drought is the most common for the special distribution of seasonal and annual drought in Shanxi; The emergence of seasonal and annual drought has not only obvious inter- decadal changes but also significant inter-annual changes. In the recent 48 years, annual drought index in Shanxi presented a significantly downward trend, and an abrupt change emerged after 1977, then the climate in the province has been entering a continuous dry period. |
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