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Rapid increase of potential evapotranspiration weakens the effect of precipitation on aridity in global drylands
Journal of Arid Environments ( IF 2.7 ) Pub Date : 2021-01-04 , DOI: 10.1016/j.jaridenv.2020.104414
Ning Pan , Shuai Wang , Yanxu Liu , Yan Li , Feng Xue , Fangli Wei , Haipeng Yu , Bojie Fu

Drylands are of great significance on terrestrial ecosystems and economic development, while being sensitive to climate changes and human activities. How global drylands extent and climate changed is not clear, and the dominant factor is the dispute over enhanced air evaporative demand and insufficient precipitation. This study attempted to fill this gap by exploring the trends in dryland areas, aridity index (AI), precipitation (P), and potential evapotranspiration (PET), and quantifying the temporal contributions of P and PET to AI. The results showed that the total dryland area shrunk 0.71 × 106 km2 during 1901–2017 with reversed trend of shrinking to expanding. Precipitation dominates aridity in 88% of drylands, except for some regions in Europe and East Asia. With global warming, the relative contribution of PET to aridity in drylands increased significantly with a rate of 0.07% per year. The effect of PET exceeded that of P in 1966, which was the reason for the trend reversals of average AI.



中文翻译:

潜在蒸散量的快速增加削弱了全球干旱地区降水对干旱的影响

旱地在对气候变化和人类活动敏感的同时,对陆地生态系统和经济发展具有重要意义。全球干旱地区的范围和气候如何变化尚不清楚,而主要的因素是关于空气蒸发需求增加和降水不足的争论。这项研究试图通过探索干旱地区,干旱指数(AI),降水(P)和潜在蒸散量(PET)的趋势以及量化P和PET对AI的时间贡献来填补这一空白。结果表明,旱地总面积缩小了0.71×10 6  km 2在1901年至2017年期间,出现了由缩小到扩大的反向趋势。除欧洲和东亚的某些地区外,降水占干旱地区88%干旱的主要地区。随着全球变暖,PET对旱地干旱的相对贡献显着增加,每年以0.07%的速度增长。PET的影响超过1966年的P,这是平均AI趋势反转的原因。

更新日期:2021-01-05
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