Temperature Variation Contrast between Nanyue Mountain and Low Elevation Areas in Past 58 Years
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Abstract:
The linear regression method is used to analyze the climatic trends in annual and seasonal mean temperatures observed at the Nanyue Mountain Observatory (2730°N, 11270°E, 1266 m ASL) from 1953 to 2011 Also the non parametric Mann Kendall (MK) test and running average 〖WTBX〗t〖WTBZ〗 test are performed to check the abrupt changes. Using a variety of analytical methods, the temperature variation regularity in more than half a century in Nanyue Mountain in the troposphere near the bottom of the atmosphere is obtained. The differences in temperature variation between Nanyue mountain and Low elevation areas (Hengshan and Hengyang) and the impaction of urbanization are analyzed. The results indicate that the annual mean daily averaged, maximum and minimum temperatures present significant upward trends in the past 58 years, with the increasing being 10, 08, and 11 ℃ per one year, respectively, and the little surrounding environment change and human activities influence. Mean temperature and minimum temperatures present increasing trends obviously in all seasons, except for an insignificant decreasing trend in summer related to daily maximum temperature. The annual mean daily and minimum temperatures changed suddenly in 1996 The daily maximum temperatures present positive anomalies in most of the period. Urbanization had certain positive contribution to the local temperature rising; the observing environment had a major influence on temperature variations in summer.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.