内蒙古西部近60a极端气温变化

doi:10.11934/j.issn.1673-4831.2017.06.001

Abstract

Abstract:

The daily highest and lowest temperature data accumulated during the period from 1958 to 2014 in the 3 meteorological stations in the western region of Inner Mongolia were cited for analysis of 10 extreme temperature indices, using the linear trend method, temperature departure and cumulative anormalies method, Mann-Kendall test, principal component analysis, and Morlet plural wavelet. Results show that:(1) Six of the 10 extreme temperature indices, i. e. annual extreme highest (lowest) temperature, warm day, warm night, summer day and hot night, displayed rising trends, while the other four, i. e., cold day, cold night, freezing day and frosting day, did declining trends; (2) Five indices in the selected study area all exhibited a cycle of 7 and 17 a or so, which reflects that the extreme weather in the region followed a certain rule of variation; (3) Principal component analysis shows that variance contribution rate of the primary principal components reached 53.57%, and the indices, high in load included warm night, hot night and frosting day, which indicates that the three indices play important roles in overall climate change in the region; And (4) Saltation analysis shows that the abrupt changes in the index of extreme value occurred around 1980, while those of relative indices did basically during the period from the 1980s to the end of the 1990s, and those of the absolute indices did mainly in 1987. Extreme temperature changes would bring about droughts to the region and cause desertification of grasslands.

Key words: extreme temperature, change trend, change cycle, abrupt change, west Inner Mongolia

CLC Number:

X16
P467

GUO Nan, SHAO Tian-jie, ZHAO Jing-bo. Extreme Change in Temperature of West Inner Mongolia in Recent 60 Years[J]. Journal of Ecology and Rural Environment, 2017, 33(6): 481-490.

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Extreme Change in Temperature of West Inner Mongolia in Recent 60 Years

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