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dc.contributor.author
Schymanski, Stanislaus J.
dc.contributor.author
Or, Dani
dc.date.accessioned
2019-11-08T13:35:33Z
dc.date.available
2017-06-11T18:50:08Z
dc.date.available
2019-11-08T13:35:33Z
dc.date.issued
2015-06-12
dc.identifier.issn
2199-899X
dc.identifier.issn
2199-8981
dc.identifier.other
10.5194/piahs-371-99-2015
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/103350
dc.identifier.doi
10.3929/ethz-b-000103350
dc.description.abstract
Transpiration is commonly conceptualised as a fraction of some potential rate, driven by so-called "atmospheric evaporative demand". Therefore, atmospheric evaporative demand or "potential evaporation" is generally used alongside with precipitation and soil moisture to characterise the environmental conditions that affect plant water use. Consequently, an increase in potential evaporation (e.g. due to climate change) is believed to cause increased transpiration and/or vegetation water stress. In the present study, we investigated the question whether potential evaporation constitutes a meaningful reference for transpiration and compared sensitivity of potential evaporation and leaf transpiration to atmospheric forcing. A physically-based leaf energy balance model was used, considering the dependence of feedbacks between leaf temperature and exchange rates of radiative, sensible and latent heat on stomatal resistance. Based on modelling results and supporting experimental evidence, we conclude that stomatal resistance cannot be parameterised as a factor relating transpiration to potential evaporation, as the ratio between transpiration and potential evaporation not only varies with stomatal resistance, but also with wind speed, air temperature, irradiance and relative humidity. Furthermore, the effect of wind speed in particular implies increase in potential evaporation, which is commonly interpreted as increased "water stress", but at the same time can reduce leaf transpiration, implying a decrease in water demand at leaf scale.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Wind effects on leaf transpiration challenge the concept of "potential evaporation"
en_US
dc.type
Conference Paper
dc.rights.license
Creative Commons Attribution 3.0 Unported
ethz.journal.title
Proceedings of the International Association of Hydrological Sciences
ethz.journal.volume
371
en_US
ethz.pages.start
99
en_US
ethz.pages.end
107
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.event
26th General Assembly of the International Union of Geodesy and Geophysics (IUGG 2015)
en_US
ethz.event.location
Prague, Czech Republic
en_US
ethz.event.date
June 22 - July 2, 2015
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03812 - Or, Dani (emeritus) / Or, Dani (emeritus)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03812 - Or, Dani (emeritus) / Or, Dani (emeritus)
ethz.date.deposited
2017-06-11T18:50:21Z
ethz.source
ECIT
ethz.identifier.importid
imp59365365b676f81778
ethz.ecitpid
pub:161591
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-19T12:40:26Z
ethz.rosetta.lastUpdated
2022-03-29T00:14:42Z
ethz.rosetta.versionExported
true
ethz.COinS
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