AustralieFrV1, Main, Exploration, bibRecord, 005A30

On the temporal upscaling of evapotranspiration from instantaneous remote sensing measurements to 8-day mean daily-sums

Identifieur interne : 005A30 ( Main/Exploration ); précédent : 005A29; suivant : 005A31

On the temporal upscaling of evapotranspiration from instantaneous remote sensing measurements to 8-day mean daily-sums

Auteurs : Youngryel Ryu [États-Unis] ; Dennis D. Baldocchi [États-Unis] ; T. Andrew Black [Canada] ; Matteo Detto [Panama] ; Beverly E. Law [États-Unis] ; Ray Leuning [Australie] ; Akira Miyata [Japon] ; Markus Reichstein [Allemagne] ; Rodrigo Vargas [Mexique] ; Christof Ammann [Suisse] ; Jason Beringer [Australie] ; Lawrence B. Flanagan [Canada] ; LIANHONG GU [États-Unis] ; Lindsay B. Hutley [Australie] ; Joon Kim [Corée du Sud] ; Harry Mccaughey [Canada] ; Eddy J. Moors [Pays-Bas] ; Serge Rambal [France] ; Timo Vesala [Finlande]

Source :

Agricultural and forest meteorology : (Print) [ 0168-1923 ] ; 2012.

RBID : Pascal:12-0042248

Descripteurs français

Pascal (Inist)
- Transformation échelle, Evapotranspiration, Télédétection, Jour, Quotidien, Méthode covariance turbulence, Biométéorologie, Mathématiques appliquées, Augmentation échelle.
Wicri :
- topic : Télédétection.

English descriptors

KwdEn :
- Applied mathematics, Biometeorology, Daily, Day, Eddy covariance method, Evapotranspiration, Remote sensing, Scale transformation, Scaling-up.

Abstract

The regular monitoring of evapotranspiration from satellites has been limited because of discontinuous temporal coverage, resulting in snapshots at a particular point in space and time. We developed a temporal upscaling scheme using satellite-derived instantaneous estimates of evapotranspiration to produce a daily-sum evapotranspiration averaged over an 8-day interval. We tested this scheme against measured evapotranspiration data from 34 eddy covariance flux towers covering seven plant functional types from boreal to tropical climatic zones. We found that the ratio of a half-hourly-sum of potential solar radiation (extraterrestrial solar irradiance on a plane parallel to the Earth's surface) between 10:00 hh and 14:00 hh to a daily-sum of potential solar radiation provides a robust scaling factor to convert a half-hourly measured evapotranspiration to an estimate of a daily-sum; the estimated and measured daily sum evapotranspiration showed strong linear relation (r² = 0.92) and small bias (-2.7%). By comparison, assuming a constant evaporative fraction (the ratio of evapotranspiration to available energy) during the daytime, although commonly used for temporal upscaling, caused 13% underestimation of evapotranspiration on an annual scale. The proposed temporal upscaling scheme requires only latitude, longitude and time as input. Thus it will be useful for developing continuous evapotranspiration estimates in space and time, which will improve continuous monitoring of hydrological cycle from local to global scales.

Affiliations:

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Le document en format XML

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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">On the temporal upscaling of evapotranspiration from instantaneous remote sensing measurements to 8-day mean daily-sums</title>
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<author><name sortKey="Lianhong Gu" sort="Lianhong Gu" uniqKey="Lianhong Gu" last="Lianhong Gu">LIANHONG GU</name>
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</author>
<author><name sortKey="Kim, Joon" sort="Kim, Joon" uniqKey="Kim J" first="Joon" last="Kim">Joon Kim</name>
<affiliation wicri:level="4"><inist:fA14 i1="14"><s1>Dep. of Landscape Architecture and Rural System Engineering, Seoul National University</s1>
<s2>Seoul</s2>
<s3>KOR</s3>
<sZ>15 aut.</sZ>
</inist:fA14>
<country>Corée du Sud</country>
<placeName><settlement type="city">Séoul</settlement>
<region type="capital">Région capitale de Séoul</region>
<settlement type="city">Séoul</settlement>
</placeName>
<orgName type="university">Université nationale de Séoul</orgName>
</affiliation>
</author>
<author><name sortKey="Mccaughey, Harry" sort="Mccaughey, Harry" uniqKey="Mccaughey H" first="Harry" last="Mccaughey">Harry Mccaughey</name>
<affiliation wicri:level="1"><inist:fA14 i1="15"><s1>Dep. of Geography, Queen's University</s1>
<s2>Kingston, Ontario</s2>
<s3>CAN</s3>
<sZ>16 aut.</sZ>
</inist:fA14>
<country>Canada</country>
<wicri:noRegion>Kingston, Ontario</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Moors, Eddy J" sort="Moors, Eddy J" uniqKey="Moors E" first="Eddy J." last="Moors">Eddy J. Moors</name>
<affiliation wicri:level="1"><inist:fA14 i1="16"><s1>ESS-CC, Alterra - Wageningen UR</s1>
<s2>Wageningen</s2>
<s3>NLD</s3>
<sZ>17 aut.</sZ>
</inist:fA14>
<country>Pays-Bas</country>
<wicri:noRegion>Wageningen</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Rambal, Serge" sort="Rambal, Serge" uniqKey="Rambal S" first="Serge" last="Rambal">Serge Rambal</name>
<affiliation wicri:level="3"><inist:fA14 i1="17"><s1>DREAM, CEFE-CNRS</s1>
<s2>Montpellier</s2>
<s3>FRA</s3>
<sZ>18 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region">Occitanie (région administrative)</region>
<region type="old region">Languedoc-Roussillon</region>
<settlement type="city">Montpellier</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Vesala, Timo" sort="Vesala, Timo" uniqKey="Vesala T" first="Timo" last="Vesala">Timo Vesala</name>
<affiliation wicri:level="4"><inist:fA14 i1="18"><s1>University of Helsinki, Dept. of Physics</s1>
<s2>Helsinki</s2>
<s3>FIN</s3>
<sZ>19 aut.</sZ>
</inist:fA14>
<country>Finlande</country>
<wicri:noRegion>Helsinki</wicri:noRegion>
<orgName type="university">Université d'Helsinki</orgName>
<placeName><settlement type="city">Helsinki</settlement>
<region type="région" nuts="2">Uusimaa</region>
</placeName>
</affiliation>
</author>
</analytic>
<series><title level="j" type="main">Agricultural and forest meteorology : (Print)</title>
<title level="j" type="abbreviated">Agric. for. meteorol. : (Print)</title>
<idno type="ISSN">0168-1923</idno>
<imprint><date when="2012">2012</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
<seriesStmt><title level="j" type="main">Agricultural and forest meteorology : (Print)</title>
<title level="j" type="abbreviated">Agric. for. meteorol. : (Print)</title>
<idno type="ISSN">0168-1923</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Applied mathematics</term>
<term>Biometeorology</term>
<term>Daily</term>
<term>Day</term>
<term>Eddy covariance method</term>
<term>Evapotranspiration</term>
<term>Remote sensing</term>
<term>Scale transformation</term>
<term>Scaling-up</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Transformation échelle</term>
<term>Evapotranspiration</term>
<term>Télédétection</term>
<term>Jour</term>
<term>Quotidien</term>
<term>Méthode covariance turbulence</term>
<term>Biométéorologie</term>
<term>Mathématiques appliquées</term>
<term>Augmentation échelle</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Télédétection</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">The regular monitoring of evapotranspiration from satellites has been limited because of discontinuous temporal coverage, resulting in snapshots at a particular point in space and time. We developed a temporal upscaling scheme using satellite-derived instantaneous estimates of evapotranspiration to produce a daily-sum evapotranspiration averaged over an 8-day interval. We tested this scheme against measured evapotranspiration data from 34 eddy covariance flux towers covering seven plant functional types from boreal to tropical climatic zones. We found that the ratio of a half-hourly-sum of potential solar radiation (extraterrestrial solar irradiance on a plane parallel to the Earth's surface) between 10:00 hh and 14:00 hh to a daily-sum of potential solar radiation provides a robust scaling factor to convert a half-hourly measured evapotranspiration to an estimate of a daily-sum; the estimated and measured daily sum evapotranspiration showed strong linear relation (r<sup>2</sup>
 = 0.92) and small bias (-2.7%). By comparison, assuming a constant evaporative fraction (the ratio of evapotranspiration to available energy) during the daytime, although commonly used for temporal upscaling, caused 13% underestimation of evapotranspiration on an annual scale. The proposed temporal upscaling scheme requires only latitude, longitude and time as input. Thus it will be useful for developing continuous evapotranspiration estimates in space and time, which will improve continuous monitoring of hydrological cycle from local to global scales.</div>
</front>
</TEI>
<affiliations><list><country><li>Allemagne</li>
<li>Australie</li>
<li>Canada</li>
<li>Corée du Sud</li>
<li>Finlande</li>
<li>France</li>
<li>Japon</li>
<li>Mexique</li>
<li>Panama</li>
<li>Pays-Bas</li>
<li>Suisse</li>
<li>États-Unis</li>
</country>
<region><li>Canton de Zurich</li>
<li>Languedoc-Roussillon</li>
<li>Massachusetts</li>
<li>Occitanie (région administrative)</li>
<li>Région capitale de Séoul</li>
<li>Uusimaa</li>
</region>
<settlement><li>Cambridge (Massachusetts)</li>
<li>Helsinki</li>
<li>Montpellier</li>
<li>Séoul</li>
<li>Zurich</li>
</settlement>
<orgName><li>Université Harvard</li>
<li>Université d'Helsinki</li>
<li>Université nationale de Séoul</li>
</orgName>
</list>
<tree><country name="États-Unis"><noRegion><name sortKey="Ryu, Youngryel" sort="Ryu, Youngryel" uniqKey="Ryu Y" first="Youngryel" last="Ryu">Youngryel Ryu</name>
</noRegion>
<name sortKey="Baldocchi, Dennis D" sort="Baldocchi, Dennis D" uniqKey="Baldocchi D" first="Dennis D." last="Baldocchi">Dennis D. Baldocchi</name>
<name sortKey="Law, Beverly E" sort="Law, Beverly E" uniqKey="Law B" first="Beverly E." last="Law">Beverly E. Law</name>
<name sortKey="Lianhong Gu" sort="Lianhong Gu" uniqKey="Lianhong Gu" last="Lianhong Gu">LIANHONG GU</name>
<name sortKey="Ryu, Youngryel" sort="Ryu, Youngryel" uniqKey="Ryu Y" first="Youngryel" last="Ryu">Youngryel Ryu</name>
</country>
<country name="Canada"><noRegion><name sortKey="Black, T Andrew" sort="Black, T Andrew" uniqKey="Black T" first="T. Andrew" last="Black">T. Andrew Black</name>
</noRegion>
<name sortKey="Flanagan, Lawrence B" sort="Flanagan, Lawrence B" uniqKey="Flanagan L" first="Lawrence B." last="Flanagan">Lawrence B. Flanagan</name>
<name sortKey="Mccaughey, Harry" sort="Mccaughey, Harry" uniqKey="Mccaughey H" first="Harry" last="Mccaughey">Harry Mccaughey</name>
</country>
<country name="Panama"><noRegion><name sortKey="Detto, Matteo" sort="Detto, Matteo" uniqKey="Detto M" first="Matteo" last="Detto">Matteo Detto</name>
</noRegion>
</country>
<country name="Australie"><noRegion><name sortKey="Leuning, Ray" sort="Leuning, Ray" uniqKey="Leuning R" first="Ray" last="Leuning">Ray Leuning</name>
</noRegion>
<name sortKey="Beringer, Jason" sort="Beringer, Jason" uniqKey="Beringer J" first="Jason" last="Beringer">Jason Beringer</name>
<name sortKey="Hutley, Lindsay B" sort="Hutley, Lindsay B" uniqKey="Hutley L" first="Lindsay B." last="Hutley">Lindsay B. Hutley</name>
</country>
<country name="Japon"><noRegion><name sortKey="Miyata, Akira" sort="Miyata, Akira" uniqKey="Miyata A" first="Akira" last="Miyata">Akira Miyata</name>
</noRegion>
</country>
<country name="Allemagne"><noRegion><name sortKey="Reichstein, Markus" sort="Reichstein, Markus" uniqKey="Reichstein M" first="Markus" last="Reichstein">Markus Reichstein</name>
</noRegion>
</country>
<country name="Mexique"><noRegion><name sortKey="Vargas, Rodrigo" sort="Vargas, Rodrigo" uniqKey="Vargas R" first="Rodrigo" last="Vargas">Rodrigo Vargas</name>
</noRegion>
</country>
<country name="Suisse"><region name="Canton de Zurich"><name sortKey="Ammann, Christof" sort="Ammann, Christof" uniqKey="Ammann C" first="Christof" last="Ammann">Christof Ammann</name>
</region>
</country>
<country name="Corée du Sud"><region name="Région capitale de Séoul"><name sortKey="Kim, Joon" sort="Kim, Joon" uniqKey="Kim J" first="Joon" last="Kim">Joon Kim</name>
</region>
</country>
<country name="Pays-Bas"><noRegion><name sortKey="Moors, Eddy J" sort="Moors, Eddy J" uniqKey="Moors E" first="Eddy J." last="Moors">Eddy J. Moors</name>
</noRegion>
</country>
<country name="France"><region name="Occitanie (région administrative)"><name sortKey="Rambal, Serge" sort="Rambal, Serge" uniqKey="Rambal S" first="Serge" last="Rambal">Serge Rambal</name>
</region>
</country>
<country name="Finlande"><region name="Uusimaa"><name sortKey="Vesala, Timo" sort="Vesala, Timo" uniqKey="Vesala T" first="Timo" last="Vesala">Timo Vesala</name>
</region>
</country>
</tree>
</affiliations>
</record>

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On the temporal upscaling of evapotranspiration from instantaneous remote sensing measurements to 8-day mean daily-sums

On the temporal upscaling of evapotranspiration from instantaneous remote sensing measurements to 8-day mean daily-sums

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