Effects of Improved Simulation of Precipitation on Evapotranspiration and Its Partitioning Over Land

Cui, Zeyu; Wang, Yong; Zhang, Guang J.; Yang, Mengmiao; Liu, Jane; Wei, Linyi

doi:10.1029/2021gl097353

Title: Effects of Improved Simulation of Precipitation on Evapotranspiration and Its Partitioning Over Land

Journal Article · 20 February 2022 · Geophysical Research Letters

DOI: https://doi.org/10.1029/2021gl097353 · OSTI ID:1978527

Cui, Zeyu ^[1];

^[2];

^[3];

^[4];

^[5]; Wei, Linyi ^[2]

Tsinghua Univ., Beijing (China); OSTI
Tsinghua Univ., Beijing (China)
Univ. of California, San Diego, CA (United States). Scripps Inst. of Oceanography
Fujian Normal University (China)
Fujian Normal University (China); Univ. of Toronto, ON (Canada)

Evapotranspiration (ET) is a key component of the global hydrological cycle, which is strongly modulated by the occurrence of different rainfall intensities. Global climate models (GCMs) commonly suffer from “too much light rain” and a negative bias in the ratio of transpiration (T) to ET (T/ET). It is unclear whether these biases are related. Here, in this work, we show that with the improved simulation of probability density functions of rainfall intensity by suppressing light-rain occurrence using a stochastic convection parameterization in the NCAR CESM1.2, the canopy T increases in tropical forests while evaporation from canopy interception and bare soil decreases. The simulated T/ET is increased by 2.5% globally and up to 8% regionally, primarily attributable to reduced fraction of wet leaves due to less frequent light rain despite its weak intensity. These results imply that excessive light rain is an important cause of the negative T/ET bias in GCMs.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0022064

OSTI ID:: 1978527

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 5 Vol. 49; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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