Acta Geographica Sinica ›› 2013, Vol. 68 ›› Issue (7): 994-1006.

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Changes in 0 ℃ isotherm height of Southwest China during 1960-2010

ZHAO Aifang, ZHANG Mingjun, SUN Meiping, WANG Baolong, WANG Shengjie, WANG Qiong   

  1. Geography and Environment College, Northwest Normal University, Lanzhou 730070, China
  • Received:2013-01-26 Revised:2013-03-09 Online:2013-07-27 Published:2013-07-27
  • Supported by:
    National Natural Science Foundation of China, No.41161012; No.41161012; The Program for New Century Excellent Talents in University from the Education Ministry of China, No.NCET-10-0019; The Basic Scientific Research Foundation in University of Gansu Province

Abstract: Based on the aerological meteorological data at 14 sounding stations in Southwest China from 1960 to 2010, as well as the corresponding 5 temperature and 2 precipitation factors measured at ground, Mann-Kendall test, linear trend estimate, correlation analysis and R/S analysis were applied. The changes in spatial and temporal distribution of 0 ℃ isotherm height and their relationships to temperature, precipitation and altitude were analyzed, and the future trends and constancy were predicted. The results indicated that the 0 ℃ isotherm height increased after a sudden decrease in the 1970s, and the patterns of different seasons varied. An increasing trend can be found in the annual, autumn and winter series, and only the trend in winter is statistically significant. A latitude gradient is generally shown from south to north with a decreasing pattern, and the distribution in summer is relatively even. The diversity of annual and seasonal series can also be detected at a spatial view. Significant spatial diversity for temperature and precipitation can be found, and the 0 ℃ isotherm height correlated well with temperature, instead of precipitation. The correlation between isotherm height in summer and altitude is more significant than in other seasonal and annual series. The changing trends in annual and seasonal series can be maintained in future, and evidenced constancies can be found at most of the stations.

Key words: Southwest China, R/S analysis, spatial diversity, 0 ℃ isotherm height, Mann-Kendall test