TY - JOUR
T1 - Recent rebound in observational large-pan evaporation driven by heat wave and droughts by the Lower Yellow River
AU - Sun, Zhigang
AU - Ouyang, Zhu
AU - Zhao, Junfang
AU - Li, Shiji
AU - Zhang, Xubo
AU - Ren, Wei
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/10
Y1 - 2018/10
N2 - Pan evaporation, as a straightforward proxy of potential evapotranspiration, has consistently decreased during the last several decades in many regions across the globe mainly because of global dimming and/or decreases in wind speed. Based on a robust measurement dataset of 30-year large-pan evaporation, however, we found that recent increasing extreme climate events have reversed the decreasing trend in pan evaporation by the Lower Yellow River, with a significant increase of up to 25.2 mm/yr during 2008–2014. Further analyses show that the decrease in large-pan evaporation during 1985–2008 (−5.1 mm/yr) was mainly caused by the decreased vapor pressure deficit (VPD) and sunshine hours. While the sharp increase in large-pan evaporation after 2008 was mainly caused by more frequent heat wave and drought events in spring and summer, which resulted in concurrent increases in air temperature, VPD, and sunshine hours. Our finding of evaporation rebound due to heat wave and droughts calls for improved strategies of water and crop managements for mitigating the negative effects of increasing extreme climate events.
AB - Pan evaporation, as a straightforward proxy of potential evapotranspiration, has consistently decreased during the last several decades in many regions across the globe mainly because of global dimming and/or decreases in wind speed. Based on a robust measurement dataset of 30-year large-pan evaporation, however, we found that recent increasing extreme climate events have reversed the decreasing trend in pan evaporation by the Lower Yellow River, with a significant increase of up to 25.2 mm/yr during 2008–2014. Further analyses show that the decrease in large-pan evaporation during 1985–2008 (−5.1 mm/yr) was mainly caused by the decreased vapor pressure deficit (VPD) and sunshine hours. While the sharp increase in large-pan evaporation after 2008 was mainly caused by more frequent heat wave and drought events in spring and summer, which resulted in concurrent increases in air temperature, VPD, and sunshine hours. Our finding of evaporation rebound due to heat wave and droughts calls for improved strategies of water and crop managements for mitigating the negative effects of increasing extreme climate events.
KW - Climatic variables
KW - Drought
KW - Extreme Climatic events
KW - Heat wave
KW - Large pan evaporation
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U2 - 10.1016/j.jhydrol.2018.08.014
DO - 10.1016/j.jhydrol.2018.08.014
M3 - Article
AN - SCOPUS:85051792392
SN - 0022-1694
VL - 565
SP - 237
EP - 247
JO - Journal of Hydrology
JF - Journal of Hydrology
ER -