44cd91518a62908278fed3363637f4e4 remotesensing1602170.pdf 0c85cb956964989f8e3c628008b8e8a6486f0f6a remotesensing1602170.pdf 405e461b57429440b44fff458635fe76ceb0d4f947dfa9abf24aa8281e9edd26 remotesensing1602170.pdf Title: Validation of Gross Primary Production Estimated by Remote Sensing for the Ecosystems of Doñana National Park through Improvements in Light Use Efficiency Estimation Subject: Doñana National Park is located in the southwest of the Iberian Peninsula, where water scarcity is recurrent, together with a high heterogeneity in species and ecosystems. Monitoring carbon assimilation is essential to improve knowledge of global change in natural vegetation cover. In this work, a light use efficiency (LUE) model was applied to estimate gross primary production (GPP) in two ecosystems of Doñana, xeric shrub (drought resistant) and seasonal marsh (with grasslands dependent on water hydroperiod) and validated with in situ data from eddy covariance (EC) towers installed in both ecosystems. The model was applied in two ways: (1) using the fraction of absorbed photosynthetically active radiation (FAPAR) from Sentinel-2 and meteorological data from reanalysis (ERA5), and (2) using Sentinel-2 FAPAR, reanalysis solar radiation (ERA5) and the Sentinel-2 land surface water index (LSWI). In both cases and for both ecosystems, the error values are acceptable (below 1 gC/m2) and in both ecosystems the model using the LSWI gave better results (R2 of 0.8 in marshes and 0.51 in xeric shrubs). The results also show a greater influence of the water status of the system than of the meteorological variables in this area. Keywords: LUE; LSWI; Doñana National Park; Sentinel-2; ERA5 Author: Pedro J. Gómez-Giráldez, Jordi Cristóbal, Héctor Nieto, Diego García-Díaz and Ricardo Díaz-Delgado Creator: LaTeX with hyperref Producer: pdfTeX-1.40.25 CreationDate: Sat Jun 15 09:24:50 2024 CEST ModDate: Sat Jun 15 09:29:24 2024 CEST Custom Metadata: no Metadata Stream: no Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 17 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 7409113 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- JYPLJJ+VnURWPalladioL-Bold Type 1 Custom yes yes yes 10 0 XIDFZU+URWPalladioL-Bold Type 1 Custom yes yes yes 16 0 XXPHCI+URWPalladioL-Roma Type 1 Custom yes yes yes 22 0 WZAOIF+URWPalladioL-Ital Type 1 Custom yes yes yes 27 0 HCRKXL+VnURWPalladioL Type 1 Custom yes yes yes 32 0 ZKJPJD+TimesNewRomanPS-BoldItalicMT Type 1C WinAnsi yes yes no 48 0 VORBJF+CMSY10 Type 1 Builtin yes yes yes 65 0 KLLLCG+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 80 0 KLLLCH+PalatinoLinotype CID TrueType Identity-H yes yes yes 83 0 KLLLCI+PalatinoLinotype TrueType WinAnsi yes yes no 89 0 KLLLCK+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 92 0 TMLEUV+EURM10 Type 1 Builtin yes yes yes 100 0 WBREXZ+PazoMath-Italic Type 1 Builtin yes yes yes 108 0 KLLLCG+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 123 0 KLLLCH+PalatinoLinotype CID TrueType Identity-H yes yes yes 126 0 KLLLCI+PalatinoLinotype TrueType WinAnsi yes yes no 132 0 KLLLCK+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 135 0 KLLPHA+Cambria CID TrueType Identity-H yes yes yes 138 0 KLLLCG+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 158 0 KLLLCH+PalatinoLinotype CID TrueType Identity-H yes yes yes 161 0 KLLLCI+PalatinoLinotype TrueType WinAnsi yes yes no 167 0 KLLLCK+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 170 0 KLLLCG+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 185 0 KLLLCH+PalatinoLinotype CID TrueType Identity-H yes yes yes 188 0 KLLLCI+PalatinoLinotype TrueType WinAnsi yes yes no 194 0 KLLLCK+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 197 0 KLLLCG+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 211 0 KLLLCH+PalatinoLinotype CID TrueType Identity-H yes yes yes 214 0 KLLLCI+PalatinoLinotype TrueType WinAnsi yes yes no 220 0 KLLLCK+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 223 0 KLLLCG+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 237 0 KLLLCI+PalatinoLinotype TrueType WinAnsi yes yes no 240 0 KLLLCK+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 243 0 Jhove (Rel. 1.28.0, 2023-05-18) Date: 2024-11-01 02:51:00 CET RepresentationInformation: remotesensing1602170.pdf ReportingModule: PDF-hul, Rel. 1.12.4 (2023-03-16) LastModified: 2024-10-24 08:11:12 CEST Size: 7409113 Format: PDF Version: 1.7 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf PDFMetadata: Objects: 488 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: section.1 Item: Title: Materials and Methods Destination: section.2 Children: Item: Title: Study Site, Instrumentation and Data Sources Destination: subsection.2.1 Item: Title: LUE Model Destination: subsection.2.2 Children: Item: Title: FAPAR Estimation Destination: subsubsection.2.2.1 Item: Title: PAR Estimation Destination: subsubsection.2.2.2 Item: Title: Estimation Destination: subsubsection.2.2.3 Item: Title: Evaluation Procedure Destination: subsection.2.3 Item: Title: Results Destination: section.3 Children: Item: Title: Xeric Shrubland Destination: subsection.3.1 Item: Title: Marshland Destination: subsection.3.2 Item: Title: Discussion Destination: section.4 Children: Item: Title: GPP Dynamics Destination: subsection.4.1 Item: Title: LUE Models Validation Destination: subsection.4.2 Children: Item: Title: LUE-Models Validation in Xeric Shrublands Destination: subsubsection.4.2.1 Item: Title: LUE-Models Validation in Marshland Destination: subsubsection.4.2.2 Item: Title: Conclusions Destination: section.5 Item: Title: References Destination: section.6 Info: Title: Validation of Gross Primary Production Estimated by Remote Sensing for the Ecosystems of Doñana National Park through Improvements in Light Use Efficiency Estimation Author: Pedro J. Gómez-Giráldez, Jordi Cristóbal, Héctor Nieto, Diego García-Díaz and Ricardo Díaz-Delgado Subject: Doñana National Park is located in the southwest of the Iberian Peninsula, where water scarcity is recurrent, together with a high heterogeneity in species and ecosystems. Monitoring carbon assimilation is essential to improve knowledge of global change in natural vegetation cover. In this work, a light use efficiency (LUE) model was applied to estimate gross primary production (GPP) in two ecosystems of Doñana, xeric shrub (drought resistant) and seasonal marsh (with grasslands dependent on water hydroperiod) and validated with in situ data from eddy covariance (EC) towers installed in both ecosystems. The model was applied in two ways: (1) using the fraction of absorbed photosynthetically active radiation (FAPAR) from Sentinel-2 and meteorological data from reanalysis (ERA5), and (2) using Sentinel-2 FAPAR, reanalysis solar radiation (ERA5) and the Sentinel-2 land surface water index (LSWI). In both cases and for both ecosystems, the error values are acceptable (below 1 gC/m2) and in both ecosystems the model using the LSWI gave better results (R2 of 0.8 in marshes and 0.51 in xeric shrubs). The results also show a greater influence of the water status of the system than of the meteorological variables in this area. 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