Ocean-color radiometry across the Southern Atlantic and Southeastern Pacific: Accuracy and remote sensing implications
Identifieur interne : 000126 ( Main/Exploration ); précédent : 000125; suivant : 000127Ocean-color radiometry across the Southern Atlantic and Southeastern Pacific: Accuracy and remote sensing implications
Auteurs : Natália De Moraes Rudorff [Brésil] ; Robert Frouin [États-Unis] ; Milton Kampel [Brésil] ; Clemence Goyens [France] ; Xavier Meriaux [France] ; Brian Schieber [États-Unis] ; B. Greg Mitchell [États-Unis]Source :
- Remote sensing of environment [ 0034-4257 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Océan, Milieu marin, Océanographie.
English descriptors
- KwdEn :
Abstract
Ocean color radiometry (OCR) provides valuable data for biogeochemical oceanography. In situ OCR measurements are used in the development and validation of bio-optical models and vicarious calibration of satellite ocean-color sensors. It is thus crucial to obtain accurate in situ OCR measurements, which is a challenge, especially in regions subjected to adverse environmental conditions and where waters are optically complex. In the present work, the accuracy of in situ OCR is analyzed with data acquired in a wide range of bio-geographic provinces across the Southern Atlantic and Southeastern Pacific during the R/V Melville MV1102 cruise. Varied techniques employed to measure above-water remote sensing reflectance (Rrs) are inter-compared. Measured Rrs is also compared with modeled Rrs in a closure experiment. The impact of Rrs uncertainties on the retrieval of chlorophyll a concentration (Chla) and inherent optical properties (IOPs) is evaluated using operational bio-optical algorithms. The relative percent difference (RPD) between Rrs measured by the various techniques ranged from 12 to 26% for the ocean-color bands (412-555 nm), and 3-12% for the ratios (412-510/555). A merged Rrs obtained by averaging the different types of measurements, INS, is recommended to reduce uncertainties. The coefficient of variation of INS and reflectance ratios was 11-13% and 3-5%, respectively. The RPD between INS and modeled Rrs and the corresponding ratios ranged from 18 to 34% and from 13 to 17%, respectively. Complete closure could not be obtained due to both measurement and modeling uncertainties. The impact of INS uncertainties on retrieved Chla and IOPs was generally smaller than the intrinsic errors of the inversion schemes. The results suggest that even though more accurate ocean-color radiometry is desirable, improving retrieval algorithms is essential to properly describing and furthering our understanding of bio-optical variability in the world's oceans.
Affiliations:
- Brésil, France, États-Unis
- Californie, Nord-Pas-de-Calais, Nord-Pas-de-Calais-Picardie, État de São Paulo
- São Paulo, Wimereux
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Le document en format XML
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Greg Mitchell</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Scripps Institution of Oceanography, University of California San Diego, La Jolla Shores Drive</s1><s2>La Jolla, CA 92037</s2><s3>USA</s3><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">14-0137721</idno><date when="2014">2014</date><idno type="stanalyst">PASCAL 14-0137721 INIST</idno><idno type="RBID">Pascal:14-0137721</idno><idno type="wicri:Area/PascalFrancis/Corpus">000017</idno><idno type="wicri:Area/PascalFrancis/Curation">000747</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000009</idno><idno type="wicri:doubleKey">0034-4257:2014:De Moraes Rudorff N:ocean:color:radiometry</idno><idno type="wicri:Area/Main/Merge">000127</idno><idno type="wicri:Area/Main/Curation">000126</idno><idno type="wicri:Area/Main/Exploration">000126</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Ocean-color radiometry across the Southern Atlantic and Southeastern Pacific: Accuracy and remote sensing implications</title><author><name sortKey="De Moraes Rudorff, Natalia" sort="De Moraes Rudorff, Natalia" uniqKey="De Moraes Rudorff N" first="Natália" last="De Moraes Rudorff">Natália De Moraes Rudorff</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Instituto Nacional de Pesquisas Espaciais, Avenida dos Astronautas, 1758 São José dos Campos</s1><s2>São Paulo</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Brésil</country><placeName><settlement type="city">São Paulo</settlement><region type="state">État de São Paulo</region></placeName></affiliation></author><author><name sortKey="Frouin, Robert" sort="Frouin, Robert" uniqKey="Frouin R" first="Robert" last="Frouin">Robert Frouin</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Scripps Institution of Oceanography, University of California San Diego, La Jolla Shores Drive</s1><s2>La Jolla, CA 92037</s2><s3>USA</s3><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Kampel, Milton" sort="Kampel, Milton" uniqKey="Kampel M" first="Milton" last="Kampel">Milton Kampel</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Instituto Nacional de Pesquisas Espaciais, Avenida dos Astronautas, 1758 São José dos Campos</s1><s2>São Paulo</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Brésil</country><placeName><settlement type="city">São Paulo</settlement><region type="state">État de São Paulo</region></placeName></affiliation></author><author><name sortKey="Goyens, Clemence" sort="Goyens, Clemence" uniqKey="Goyens C" first="Clemence" last="Goyens">Clemence Goyens</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratoire d'Océanologie et de Géosciences, Université du Littoral-Côte d'Opale, 32 Avenue Foch</s1><s2>62930 Wimereux</s2><s3>FRA</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Nord-Pas-de-Calais-Picardie</region><region type="old region" nuts="2">Nord-Pas-de-Calais</region><settlement type="city">Wimereux</settlement></placeName></affiliation></author><author><name sortKey="Meriaux, Xavier" sort="Meriaux, Xavier" uniqKey="Meriaux X" first="Xavier" last="Meriaux">Xavier Meriaux</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratoire d'Océanologie et de Géosciences, Université du Littoral-Côte d'Opale, 32 Avenue Foch</s1><s2>62930 Wimereux</s2><s3>FRA</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Nord-Pas-de-Calais-Picardie</region><region type="old region" nuts="2">Nord-Pas-de-Calais</region><settlement type="city">Wimereux</settlement></placeName></affiliation></author><author><name sortKey="Schieber, Brian" sort="Schieber, Brian" uniqKey="Schieber B" first="Brian" last="Schieber">Brian Schieber</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Scripps Institution of Oceanography, University of California San Diego, La Jolla Shores Drive</s1><s2>La Jolla, CA 92037</s2><s3>USA</s3><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Mitchell, B Greg" sort="Mitchell, B Greg" uniqKey="Mitchell B" first="B. Greg" last="Mitchell">B. Greg Mitchell</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Scripps Institution of Oceanography, University of California San Diego, La Jolla Shores Drive</s1><s2>La Jolla, CA 92037</s2><s3>USA</s3><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Remote sensing of environment</title><title level="j" type="abbreviated">Remote sens. environ.</title><idno type="ISSN">0034-4257</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Remote sensing of environment</title><title level="j" type="abbreviated">Remote sens. environ.</title><idno type="ISSN">0034-4257</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Environmental factor</term><term>Reflectance</term><term>Space remote sensing</term><term>Validation</term><term>accuracy</term><term>biogeochemistry</term><term>calibration</term><term>color</term><term>development</term><term>experimental studies</term><term>in situ</term><term>marine environment</term><term>measurement sensor</term><term>models</term><term>ocean</term><term>oceanography</term><term>radiometry</term><term>reflectance</term><term>satellite measurements</term><term>techniques</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Océan</term><term>Milieu marin</term><term>Couleur</term><term>Radiométrie</term><term>Précision</term><term>Télédétection spatiale</term><term>Biogéochimie</term><term>Océanographie</term><term>In situ</term><term>Développement</term><term>Validation</term><term>Modèle</term><term>Etalonnage</term><term>Mesure satellite</term><term>Capteur mesure</term><term>Facteur milieu</term><term>Technique</term><term>Pouvoir réflecteur</term><term>Facteur réflexion</term><term>Etude expérimentale</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Océan</term><term>Milieu marin</term><term>Océanographie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Ocean color radiometry (OCR) provides valuable data for biogeochemical oceanography. In situ OCR measurements are used in the development and validation of bio-optical models and vicarious calibration of satellite ocean-color sensors. It is thus crucial to obtain accurate in situ OCR measurements, which is a challenge, especially in regions subjected to adverse environmental conditions and where waters are optically complex. In the present work, the accuracy of in situ OCR is analyzed with data acquired in a wide range of bio-geographic provinces across the Southern Atlantic and Southeastern Pacific during the R/V Melville MV1102 cruise. Varied techniques employed to measure above-water remote sensing reflectance (R<sub>rs</sub>) are inter-compared. Measured R<sub>rs</sub> is also compared with modeled R<sub>rs</sub> in a closure experiment. The impact of R<sub>rs</sub> uncertainties on the retrieval of chlorophyll a concentration (Chla) and inherent optical properties (IOPs) is evaluated using operational bio-optical algorithms. The relative percent difference (RPD) between R<sub>rs</sub> measured by the various techniques ranged from 12 to 26% for the ocean-color bands (412-555 nm), and 3-12% for the ratios (412-510/555). A merged Rrs obtained by averaging the different types of measurements, INS, is recommended to reduce uncertainties. The coefficient of variation of INS and reflectance ratios was 11-13% and 3-5%, respectively. The RPD between INS and modeled R<sub>rs</sub> and the corresponding ratios ranged from 18 to 34% and from 13 to 17%, respectively. Complete closure could not be obtained due to both measurement and modeling uncertainties. The impact of INS uncertainties on retrieved Chla and IOPs was generally smaller than the intrinsic errors of the inversion schemes. The results suggest that even though more accurate ocean-color radiometry is desirable, improving retrieval algorithms is essential to properly describing and furthering our understanding of bio-optical variability in the world's oceans.</div></front></TEI><affiliations><list><country><li>Brésil</li><li>France</li><li>États-Unis</li></country><region><li>Californie</li><li>Nord-Pas-de-Calais</li><li>Nord-Pas-de-Calais-Picardie</li><li>État de São Paulo</li></region><settlement><li>São Paulo</li><li>Wimereux</li></settlement></list><tree><country name="Brésil"><region name="État de São Paulo"><name sortKey="De Moraes Rudorff, Natalia" sort="De Moraes Rudorff, Natalia" uniqKey="De Moraes Rudorff N" first="Natália" last="De Moraes Rudorff">Natália De Moraes Rudorff</name></region><name sortKey="Kampel, Milton" sort="Kampel, Milton" uniqKey="Kampel M" first="Milton" last="Kampel">Milton Kampel</name></country><country name="États-Unis"><region name="Californie"><name sortKey="Frouin, Robert" sort="Frouin, Robert" uniqKey="Frouin R" first="Robert" last="Frouin">Robert Frouin</name></region><name sortKey="Mitchell, B Greg" sort="Mitchell, B Greg" uniqKey="Mitchell B" first="B. Greg" last="Mitchell">B. Greg Mitchell</name><name sortKey="Schieber, Brian" sort="Schieber, Brian" uniqKey="Schieber B" first="Brian" last="Schieber">Brian Schieber</name></country><country name="France"><region name="Nord-Pas-de-Calais-Picardie"><name sortKey="Goyens, Clemence" sort="Goyens, Clemence" uniqKey="Goyens C" first="Clemence" last="Goyens">Clemence Goyens</name></region><name sortKey="Meriaux, Xavier" sort="Meriaux, Xavier" uniqKey="Meriaux X" first="Xavier" last="Meriaux">Xavier Meriaux</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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