Robust historical evapotranspiration trends across climate regimes
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Published:2021-07-06
Issue:7
Volume:25
Page:3855-3874
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Hobeichi Sanaa, Abramowitz GabORCID, Evans Jason P.ORCID
Abstract
Abstract. Evapotranspiration (ET) links the hydrological, energy and carbon cycles on
the land surface. Quantifying ET and its spatio-temporal changes is also key
to understanding climate extremes such as droughts, heatwaves and flooding.
Regional ET estimates require reliable observation-based gridded ET
datasets, and while many have been developed using physically based,
empirically based and hybrid techniques, their efficacy, and particularly
the efficacy of their uncertainty estimates, is difficult to verify. In this
work, we extend the methodology used in Hobeichi et al. (2018) to derive two
new versions of the Derived Optimal Linear Combination Evapotranspiration
(DOLCE) product, with observationally constrained spatio-temporally varying
uncertainty estimates, higher spatial resolution, more constituent products
and extended temporal coverage (1980–2018). After demonstrating the efficacy
of these uncertainty estimates with out-of-sample testing, we derive novel ET climatology
clusters for the land surface, based on the magnitude and variability of ET
at each location on land. The new clusters include three wet and three dry
regimes and provide an approximation of Köppen–Geiger climate classes.
The verified uncertainty estimates and extended time period then allow us to
examine the robustness of historical trends spatially and in each of these
six ET climatology clusters. We find that despite robust decreasing ET
trends in some regions these do not correlate with behavioural ET clusters.
Each cluster, and the majority of the Earth's surface, shows clear robust
increases in ET over the recent historical period. The new datasets DOLCE
V2.1 and DOLCE V3 can be used for benchmarking global ET estimates and for
examining ET trends respectively.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
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