%0 Journal Article %A DILINUER Tuoliewubieke %A LI Dongliang %T Characteristics of the Dry/Wet Climate Change in Central Asia in Recent 115 Years %D 2018 %R 10.11755/j.issn.1006-7639(2018)-02-0185 %J Journal of Arid Meteorology %P 185-195 %V 36 %N 2 %X

Based on the monthly mean temperature, precipitation and potential evapotranspiration data provided by CRU and the standardized precipitation evapotranspiration data with  12 months scale (SPEI12) from IPE-CSIC during 1901-2015, the climatic factors in recent 115 years were comprehensively analyzed and the spatial-temporal pattern of dry/wet climate change was explored in Central Asia. The results show that the spatial distribution of annual mean temperature in Central Asia presented warmer in east and west regions but colder in the middle, and it showed a significant warming trend in the whole region and its climate tendency rate was 0.15 ℃·(10 a)-1. For annual precipitation, it was more in central and south regions and less in the east and west regions, and it was increasing in most regions except the Kazakhstan Plain in the northern Central Asia. The annual potential evapotranspiration in the whole region was much larger than annual precipitation, which was closely related to topography and underlying surface, and it was characterized by larger in the east and west desert area and relatively smaller in the central mountainous region. The dry/wet index SPEI12 considering the water-heat balance showed a weaker decreasing trend in the Kazakh plains, which indicated the area became slightly dry, while in other areas it presented an increase trend, which indicated the areas became wet. The SPEI12 was decomposed into six sub-regions by using the rotated empirical orthogonal function (REOF), and the abrupt change of temperature was earlier in the east than that in the west for each subarea, and  precipitation in the west increased significantly earlier than that in the east, and the mutation time of SPEI12 in the west was earlier than that in the east. Based on the ensemble empirical mode decomposition (EEMD), the variation period of SPEI12 and precipitation were analyzed at different time scales. SPEI12 had a significant oscillation period of quasi-14 years and precipitation had a significant oscillation period of quasi-3 years and 14 years.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2018)-02-0185