干旱区研究2018，Vol.35Issue(2)：260-268,9.DOI:10.13866/j.azr.2018.02.02
亚洲中部干旱区干湿时空变化特征
Spatiotemporal Variation of Wetting or Drying in the Arid Regions in Central Asia
摘要
Abstract
In the past 100 years, a global warming with regional difference occurred, which induced the dry re-gions became drier and wet regions became wetter.As one of the major arid regions in the world, the drying and wet-ting changes over the arid regions in Central Asia played an important role in ecosystems in these regions.The global monthly Palmer Drought Severity Index (PDSI) was applied to explore the spatiotemporal characteristics of the dr-ying and wetting trends over the arid regions in Central Asia during the period of 1950-2014. The results showed that a weak wetting trend was obtained in these regions, and such trend became more significant after the 1980s.A nonlinear trend with a 3-7 year period was found according to the ensemble empirical mode decomposition (EE-MD) method, which was consistent with the multi-periodic precipitation variation in Central Asia.A drying trend oc-curred in the five countries in Central Asia but a wetting trend in northwest China, which was consistent with the variation trend of precipitation over these regions.In addition, the results revealed that it was not true that the "dry regions become drier, and the wet regions become wetter"in Central Asia. These findings provide the important sci-entific bases for the water sources utilization and the sustainable development of ecosystem.关键词
干湿变化/PDSI/时空格局/中亚干旱区(亚洲中部干旱区)Key words
drying or wetting trend/PDSI/spatiotemporal pattern/Arid Region of Central Asia引用本文复制引用
胡增运,胡汝骥,周启鸣,陈曦,殷刚,钱静..亚洲中部干旱区干湿时空变化特征[J].干旱区研究,2018,35(2):260-268,9.基金项目
国家国际科技合作项目(2010DFA92720) （2010DFA92720）
UNDP项目(0076478) （0076478）
中国科学院西部青年学者项目(2015-XBQN-B20)资助 （2015-XBQN-B20）
