• Global semi-arid climate change over last 60 years
    Author: Huang J, Ji M, Xie Y, Wang S, He Y, and Ran J
    Source: Climate Dynamics 46(3): p.1131–1150
    Keywords: Semi-arid region
    Year: 2016
    Author Affiliation: Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, Gansu, China
    Abstract:The study analyses real changes and regional climate variations in global semi-arid regions over 61 years (1948–2008) and investigates the dynamics of global semi-arid climate change. The results reveal that the largest expansion of dry lands has occurred in semi-arid regions since the early 1960s. This expansion of semi-arid regions accounts for more than half of the total dry land expansion. The area of semi-arid regions in the most recent 15 years studied (1990–2004) is 7 per cent greater than that during the first 15 years (1948–1962) of the study period; this expansion totalled 0.4 × 106 and 1.2 × 106 km² within the American continents and in the Eastern Hemisphere, respectively. Although semi-arid expansion occurred in both regions, the shifting patterns of the expansion are different. Across the American continents, the newly formed semi-arid regions are developed from arid regions, in which the climate became wetter. Conversely, in the continental Eastern Hemisphere, semi-arid regions replaced sub-humid/humid regions, in which the climate became drier. The climate change drying semi-arid regions over East Asia is primarily dominated by a weakened East Asian summer monsoon, while the wetting of semi-arid regions over North America is primarily controlled by enhanced westerly.

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