| Analysis of climate change characteristics and influence factors in Haidong of Qinghai Province in recent 55 years |
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| DOI：10.7606/j.issn.1000-7601.2019.03.36 |
| Key Words: climate change potential evapotranspiration humidity index influence factors haidong city |
| Author Name | Affiliation | | PEI Yu-fang | The Meteorological Administration of Minhe County, Chuankou, Qinghai 817200, China
Qinghai Key Laboratory of Disaster Preventing and Reducing, Xining， Qinhai 810001, China | | QI Dong-lin | Institute of Qinghai Meteorological Science Research, Xining, Qinhai 810001, China | | ZHANG Qi-fa | The Meteorological Administration of Minhe County, Chuankou, Qinghai 817200, China | | ZHAO Quan-ning | Institute of Qinghai Meteorological Science Research, Xining, Qinhai 810001, China |
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| Abstract: |
| Using climatic data of 1961-2015 from 5 meteorological stations in Haidong, Qinghai Province, and the method of linear regression and Mann-Kendall mutation detection, the climatic factors such as average annual and seasonal temperatures, precipitation, sunlight hours, wind speed, dust day, cloud, and relative humidity, as well as the change trend and change characteristic of the raining days, potential evapotranspiration, and humidity index were studied. The result showed: (1) In recent 55 years, Haidong had been warmer with the decrease of precipitation（-4.9 mm·(10a)-1）, showing an obvious ‘warmer and dryer’ trend. The annual average temperature and potential evapotranspiration showed a significant increase trend (0.33 ℃·(10a)-1 and 7.9 mm·(10a)-1), the number of annual precipitation days, the average wind speed, the number of sandstorm days, sunshine hours, cloud and relative humidity showed a significant decrease trend（-2.3 d·(10a)-1, -0.13 m·s-1·(10a)-1, -6.3 d·(10a)-1, -36.6 h·(10a)-1, -0.12·(10a)-1 and -0.7％·(10a)-1）, the humidity index and precipitation showed decreased trend but not significant. (2) The average annual temperature and potential evapotranspiration had a significant abrupt increase in 1995-1996 and 2001. The average annual wind speed, the number precipitation days, the sunshine hours, the total cloud and relative humidity significantly lower in 1982, 1993-1994, 2002-2003, 1984 and 2009-2010, while the change of the humidity index did not reach the mutation standard. (3) There was a significant positive correlation between the winter temperature change in Haidong and the Qinghai Tibet Plateau index, the Arctic Oscillation Index and the westerly circulation index. The dynamic and thermodynamic effects of the Qinghai Tibet Plateau had an important influence on the temperature changes in Haidong, which was located in the northeast side of plateau, and the temperature in this area was also affected by the winter wind and the westerly circulation caused by the Arctic Oscillation. The summer precipitation in Haidong had a greater negative correlation with the south Asian summer monsoon index and the Arctic Oscillation Index. The advance and retreat of the south Asian summer monsoon and its water vapor were one of the main factors affecting the precipitation in study area. |
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