Remote sensing data assimilation for a prognostic phenology model
Identifieur interne : 000762 ( Main/Exploration ); précédent : 000761; suivant : 000763Remote sensing data assimilation for a prognostic phenology model
Auteurs : R. Stöckli [États-Unis, Suisse] ; T. Rutishauser [Suisse] ; D. Dragoni [États-Unis] ; J. O'Keefe [États-Unis] ; P. E. Thornton [États-Unis] ; M. Jolly [États-Unis] ; L. Lu [États-Unis] ; A. S. Denning [États-Unis]Source :
- Journal of Geophysical Research: Biogeosciences [ 0148-0227 ] ; 2008-12.
Abstract
Predicting the global carbon and water cycle requires a realistic representation of vegetation phenology in climate models. However most prognostic phenology models are not yet suited for global applications, and diagnostic satellite data can be uncertain and lack predictive power. We present a framework for data assimilation of Fraction of Photosynthetically Active Radiation absorbed by vegetation (FPAR) and Leaf Area Index (LAI) from the MODerate Resolution Imaging Spectroradiometer (MODIS) to constrain empirical temperature, light, moisture and structural vegetation parameters of a prognostic phenology model. We find that data assimilation better constrains structural vegetation parameters than climate control parameters. Improvements are largest for drought‐deciduous ecosystems where correlation of predicted versus satellite‐observed FPAR and LAI increases from negative to 0.7–0.8. Data assimilation effectively overcomes the cloud‐ and aerosol‐related deficiencies of satellite data sets in tropical areas. Validation with a 49‐year‐long phenology data set reveals that the temperature‐driven start of season (SOS) is light limited in warm years. The model has substantial skill (R = 0.73) to reproduce SOS inter‐annual and decadal variability. Predicted SOS shows a higher inter‐annual variability with a negative bias of 5–20 days compared to species‐level SOS. It is however accurate to within 1–2 days compared to SOS derived from net ecosystem exchange (NEE) measurements at a FLUXNET tower. The model only has weak skill to predict end of season (EOS). Use of remote sensing data assimilation for phenology model development is encouraged but validation should be extended with phenology data sets covering mediterranean, tropical and arctic ecosystems.
Url:
DOI: 10.1029/2008JG000781
Affiliations:
- Suisse, États-Unis
- Canton de Berne, Canton de Zurich, Colorado, Massachusetts
- Berne, Cambridge (Massachusetts), Zurich
- Université Harvard, Université de Berne
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O'Keefe</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Fisher Museum, Harvard Forest, Harvard University, Massachusetts, Petersham</wicri:regionArea><orgName type="university">Université Harvard</orgName><placeName><settlement type="city">Cambridge (Massachusetts)</settlement><region type="state">Massachusetts</region></placeName></affiliation></author><author><name sortKey="Thornton, P E" sort="Thornton, P E" uniqKey="Thornton P" first="P. E." last="Thornton">P. E. Thornton</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Terrestrial Sciences Section, National Center for Atmospheric Research, Tennessee, Oak Ridge</wicri:regionArea><wicri:noRegion>Oak Ridge</wicri:noRegion></affiliation></author><author><name sortKey="Jolly, M" sort="Jolly, M" uniqKey="Jolly M" first="M." last="Jolly">M. 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Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2008-12">2008-12</date><biblScope unit="volume">113</biblScope><biblScope unit="issue">G4</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">182446E1B753A5B6980C98E8BDD3F5C06D395D72</idno><idno type="DOI">10.1029/2008JG000781</idno><idno type="ArticleID">2008JG000781</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Predicting the global carbon and water cycle requires a realistic representation of vegetation phenology in climate models. However most prognostic phenology models are not yet suited for global applications, and diagnostic satellite data can be uncertain and lack predictive power. We present a framework for data assimilation of Fraction of Photosynthetically Active Radiation absorbed by vegetation (FPAR) and Leaf Area Index (LAI) from the MODerate Resolution Imaging Spectroradiometer (MODIS) to constrain empirical temperature, light, moisture and structural vegetation parameters of a prognostic phenology model. We find that data assimilation better constrains structural vegetation parameters than climate control parameters. Improvements are largest for drought‐deciduous ecosystems where correlation of predicted versus satellite‐observed FPAR and LAI increases from negative to 0.7–0.8. Data assimilation effectively overcomes the cloud‐ and aerosol‐related deficiencies of satellite data sets in tropical areas. Validation with a 49‐year‐long phenology data set reveals that the temperature‐driven start of season (SOS) is light limited in warm years. The model has substantial skill (R = 0.73) to reproduce SOS inter‐annual and decadal variability. Predicted SOS shows a higher inter‐annual variability with a negative bias of 5–20 days compared to species‐level SOS. It is however accurate to within 1–2 days compared to SOS derived from net ecosystem exchange (NEE) measurements at a FLUXNET tower. The model only has weak skill to predict end of season (EOS). Use of remote sensing data assimilation for phenology model development is encouraged but validation should be extended with phenology data sets covering mediterranean, tropical and arctic ecosystems.</div></front></TEI><affiliations><list><country><li>Suisse</li><li>États-Unis</li></country><region><li>Canton de Berne</li><li>Canton de Zurich</li><li>Colorado</li><li>Massachusetts</li></region><settlement><li>Berne</li><li>Cambridge (Massachusetts)</li><li>Zurich</li></settlement><orgName><li>Université Harvard</li><li>Université de Berne</li></orgName></list><tree><country name="États-Unis"><region name="Colorado"><name sortKey="Stockli, R" sort="Stockli, R" uniqKey="Stockli R" first="R." last="Stöckli">R. Stöckli</name></region><name sortKey="Denning, A S" sort="Denning, A S" uniqKey="Denning A" first="A. S." last="Denning">A. S. Denning</name><name sortKey="Dragoni, D" sort="Dragoni, D" uniqKey="Dragoni D" first="D." last="Dragoni">D. Dragoni</name><name sortKey="Jolly, M" sort="Jolly, M" uniqKey="Jolly M" first="M." last="Jolly">M. Jolly</name><name sortKey="Lu, L" sort="Lu, L" uniqKey="Lu L" first="L." last="Lu">L. Lu</name><name sortKey="O Keefe, J" sort="O Keefe, J" uniqKey="O Keefe J" first="J." last="O'Keefe">J. O'Keefe</name><name sortKey="Stockli, R" sort="Stockli, R" uniqKey="Stockli R" first="R." last="Stöckli">R. Stöckli</name><name sortKey="Thornton, P E" sort="Thornton, P E" uniqKey="Thornton P" first="P. E." last="Thornton">P. E. Thornton</name></country><country name="Suisse"><region name="Canton de Zurich"><name sortKey="Stockli, R" sort="Stockli, R" uniqKey="Stockli R" first="R." last="Stöckli">R. Stöckli</name></region><name sortKey="Rutishauser, T" sort="Rutishauser, T" uniqKey="Rutishauser T" first="T." last="Rutishauser">T. Rutishauser</name><name sortKey="Stockli, R" sort="Stockli, R" uniqKey="Stockli R" first="R." last="Stöckli">R. 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