Attribution of Evapotranspiration Changes in Humid Regions of China from 1982 to 2016

Zhang, D; Liu, X; Zhang, L; Zhang, Q; Gan, R; Li, X

Attribution of Evapotranspiration Changes in Humid Regions of China from 1982 to 2016

Zhang, D Liu, X Zhang, L Zhang, Q Gan, R Li, X

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Publisher:: American Geophysical Union (AGU)
Publication Type:: Journal Article
Citation:: Journal of Geophysical Research: Atmospheres, 2020, 125, (13)
Issue Date:: 2020-07-16

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Field	Value	Language
dc.contributor.author	Zhang, D
dc.contributor.author	Liu, X
dc.contributor.author	Zhang, L
dc.contributor.author	Zhang, Q
dc.contributor.author	Gan, R
dc.contributor.author	Li, X
dc.date.accessioned	2021-06-22T05:28:39Z
dc.date.available	2021-06-22T05:28:39Z
dc.date.issued	2020-07-16
dc.identifier.citation	Journal of Geophysical Research: Atmospheres, 2020, 125, (13)
dc.identifier.issn	2169-897X
dc.identifier.issn	2169-8996
dc.identifier.uri	http://hdl.handle.net/10453/149712
dc.description.abstract	This study quantifies the influences of climate variation and vegetation greening on the changes in evapotranspiration (ET) over 110 humid catchments of China from 1982 to 2016. A process-based model considering climate and vegetation changes is employed to estimate ET. The simulated ET compared well with the observed values based on the flux measurements and water balance equation, with the coefficients of determination above 0.62. During the study period, environmental change of the study area was characterized by the increases in air temperature and leaf area index, that is, climate warming and vegetation greening. Annual ET increased at 104 catchments with the trends ranging from 0.01 to 6.2 mm yr−2. The numerical experiment approach and sensitivity method are used to attribute ET changes to climate variation and vegetation greening. The results show that the contributions of climate variation to ET changes estimated by the two methods are 90.6% and 91.3%, respectively, whereas the contributions of vegetation greening to ET changes are only 9.4% and 8.7%, indicating that climate variation controls ET changes in the study area. However, vegetation greening alters the proportions of ET components, which contributes 59.0%–62.0% to the increase in the ratio of transpiration to ET. This study quantifies the roles of climate and vegetation changes in the dynamics of ET, suggesting that more concerns should be paid on the interactions between ecological processes and hydrological cycle in humid regions.
dc.language	en
dc.publisher	American Geophysical Union (AGU)
dc.relation.ispartof	Journal of Geophysical Research: Atmospheres
dc.relation.isbasedon	10.1029/2020JD032404
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0401 Atmospheric Sciences, 0406 Physical Geography and Environmental Geoscience
dc.title	Attribution of Evapotranspiration Changes in Humid Regions of China from 1982 to 2016
dc.type	Journal Article
utslib.citation.volume	125
utslib.for	0401 Atmospheric Sciences
utslib.for	0406 Physical Geography and Environmental Geoscience
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2021-06-22T05:28:33Z
pubs.issue	13
pubs.publication-status	Published
pubs.volume	125
utslib.citation.issue	13

Abstract:

This study quantifies the influences of climate variation and vegetation greening on the changes in evapotranspiration (ET) over 110 humid catchments of China from 1982 to 2016. A process-based model considering climate and vegetation changes is employed to estimate ET. The simulated ET compared well with the observed values based on the flux measurements and water balance equation, with the coefficients of determination above 0.62. During the study period, environmental change of the study area was characterized by the increases in air temperature and leaf area index, that is, climate warming and vegetation greening. Annual ET increased at 104 catchments with the trends ranging from 0.01 to 6.2 mm yr−2. The numerical experiment approach and sensitivity method are used to attribute ET changes to climate variation and vegetation greening. The results show that the contributions of climate variation to ET changes estimated by the two methods are 90.6% and 91.3%, respectively, whereas the contributions of vegetation greening to ET changes are only 9.4% and 8.7%, indicating that climate variation controls ET changes in the study area. However, vegetation greening alters the proportions of ET components, which contributes 59.0%–62.0% to the increase in the ratio of transpiration to ET. This study quantifies the roles of climate and vegetation changes in the dynamics of ET, suggesting that more concerns should be paid on the interactions between ecological processes and hydrological cycle in humid regions.

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http://hdl.handle.net/10453/149712