Abstract:

Based on the annual average temperature, precipitation, average wind speed, the number of gale days and dust storm days from 1959 to 2011 at 12 meteorological stations of the Black Gobi desert region, the climatic change?characteristics were analyzed by a climatic trend method and it was compared with that in the desertification region. The results indicate that the annual mean temperature increases and its?rates are 0.34 ℃ and 0.25 ℃ per decade in the Black Gobi desert and desertification regions, so is the annual precipitation and its rates are 1.33 mm and 1.66 mm per decade respectively. The annual mean surface wind speed decreases in the Black Gobi desert region with 0.10 m·s^-1 per decade and in the desertification region with 0.14 m·s^-1 per decade, so is the number of gale days in Black Gobi desert region with 1.83 d per decade and in the desertification region with 3.44 d per decade. The number of dust storm?days decreases in Black Gobi desert region with 1.83 d per decade and in the desertification region with 1.77 d per decade, respectively. There is only one abrupt change point for most climatic factors except annual precipitation according to a Mann-Kendall test method. The spatial distributions of various climatic factors are different.

Key words: Desertification region, Climate trend method, Abrupt change