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Response of global land evapotranspiration to climate change, elevated CO2, and land use change
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2021-10-08 , DOI: 10.1016/j.agrformet.2021.108663
Jianyu Liu 1, 2 , Yuanyuan You 1 , Jianfeng Li 3 , Stephen Sitch 4 , Xihui Gu 5 , Julia E.M.S. Nabel 6 , Danica Lombardozzi 7 , Ming Luo 8, 9 , Xingyu Feng 1 , Almut Arneth 10 , Atul K. Jain 11 , Pierre Friedlingstein 12, 13 , Hanqin Tian 14 , Ben Poulter 15 , Dongdong Kong 5
Affiliation  

Climate change (CLI), elevated CO2 concentration (CO2), and land use change (LUC) have strongly altered land evapotranspiration (ET) during the recent decades. The fingerprints of these drivers in ET change, however, have not previously been detected due to the lack of these three scenarios from global climate models (GCMs). Here we applied an optimal fingerprint method to detect and attribute ET change by integrated utilization of state-of-the-art global ecosystem models and GCMs. Results indicate that CLI provides the greatest contribution to increasing ET, and its fingerprint is detectable at different timescales. CO2 reduces ET in most areas covered by forests. LUC decreases ET over the tropics, while increases ET over temperate and high-latitude regions. To further subdivide the impacts of CLI, we extend the Budyko framework to quantify the contribution of precipitation (P) and potential evapotranspiration (PET) and find that the dominant role of CLI mainly depends on the contribution of P.



中文翻译:

全球土地蒸散对气候变化、二氧化碳升高和土地利用变化的响应

近几十年来,气候变化 (CLI)、CO 2浓度升高(CO 2 ) 和土地利用变化 (LUC) 极大地改变了土地蒸散量 (ET)。然而,由于全球气候模型 (GCM) 中缺少这三种情景,因此以前没有检测到这些驱动因素在 ET 变化中的指纹。在这里,我们通过综合利用最先进的全球生态系统模型和 GCM,应用最佳指纹方法来检测和归因 ET 变化。结果表明,CLI 对增加 ET 的贡献最大,其指纹可在不同时间尺度上检测到。CO 2减少森林覆盖的大部分地区的ET。LUC 减少热带地区的 ET,而增加温带和高纬度地区的 ET。为了进一步细分 CLI 的影响,我们扩展了 Budyko 框架以量化降水 (P) 和潜在蒸散量 (PET) 的贡献,并发现 CLI 的主导作用主要取决于 P 的贡献。

更新日期:2021-10-08
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