| Spatial and temporal variation of above 0℃ thermal resources in last 56 years in Qinghai Province |
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| DOI：10.7606/j.issn.1000-7601.2018.06.32 |
| Key Words: accumulated temperature above 0℃ lasting days spatial-temporal change Qinghai Province |
| Author Name | Affiliation | | WANG Zhe | Qinghai Meteorological Science Institute, Xining， Qinghai 810001, China
Key Laboratory for Preventing and Mitigating Disaster of Qinghai Province, Xining, Qinghai 810001, China | | QI Dong-lin | Qinghai Meteorological Science Institute, Xining， Qinghai 810001, China
Key Laboratory for Preventing and Mitigating Disaster of Qinghai Province, Xining, Qinghai 810001, China | | YAN Ying-cun | Qinghai Meteorological Science Institute, Xining， Qinghai 810001, China
Key Laboratory for Preventing and Mitigating Disaster of Qinghai Province, Xining, Qinghai 810001, China | | XIAO Jian-she | Qinghai Meteorological Science Institute, Xining， Qinghai 810001, China
Key Laboratory for Preventing and Mitigating Disaster of Qinghai Province, Xining, Qinghai 810001, China | | PEI Yu-fang | The Meteorological Administration of Minhe County, Chuankou Town, Qinghai 810801, China |
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| Abstract: |
| The daily temperature data of 1960 to 2015 from 44 meteorological stations in Qinghai Province were used to study the temporal and spatial variation of steadily accumulated temperature (≥0℃), lasting days, the beginning and ending dates by using the methods of linear trend estimation, Mann-kendall, and Inverse Distance Weighting (IDW). The results showed: (1) In last 56 years, the accumulated temperature steadily above 0℃ and its lasting days were increased at rates of 64.38℃·10a-1 and 3.25 d·10a-1, and them abrupt change ccurred in 1998, 1997, respectively. This phenomenon was mainly due to advanced start date and the delayed end date. Furthermore, the delaying of end date was more influential than the advanced start date. (2) The accumulated temperature steadily above 0℃ and its lasting days increased gradually from the southwestern region to the northeastern region in Qinghai. The areas with high values of the accumulated temperature steadily above 0℃ and the lasting days were mainly in the eastern agricultural region and Qaidam Basin, areas with low values were in the west of Three-River Headwaters Region. (3) Compared with 1960s, the areas in the section Ⅱ (500～1 500℃) of accumulated temperature above 0℃ decreased by 14.06% in the early 21st century while the areas in the section Ⅳ(2 000～3 000℃) increased by 16.34%. (4) Due to global warming, 1 500℃ isopleth expanded to high altitude and low latitude, and a significant shifting trend toward the south and the west. |
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