Climatic change characteristics of Hechi City in the last 56 years
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Abstract:
Research on characteristics of main climate factors in the area such as water, light, heat can contribute to a comprehensive understanding and rational utilization of local climatic resources, which can provide the basis for utilization of water resources, agricultural production planning, and ecological environment monitoring.Based on temperature, precipitation, sunshine duration of Hechi city from 1958 to 2013, the climate change characteristics were analyzed by linear regression, cumulative departure, Mann-Kendall methods.The results showed that: The annual temperature increased remarkably, and the tendency rate was 0. 11℃ /10a, with the mutation point appearing in 1986. The increase of temperature in the four seasons was different, but the biggest increasing range of temperature appeared in summer and autumn, which were the dominant factors of the annual mean temperature rise.The precipitation in spring, summer and autumn and annual precipitation showed a slight decrease tendency, and there was a slight increase of precipitation in winter.The annual sunshine duration was decreasing remarkably with the rate of -63.083 h/10 a, and the mutation point of decrease was in 1970,and there was a remarkable decrease after 1976. The seasonal sunshine duration decreased significantly as well, and the order of four seasons according to decreasing range were summer, autumn, winter and spring.
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