LeHavreV1, Main, Curation, bibRecord, 001294

Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery

Identifieur interne : 001294 ( Main/Curation ); précédent : 001293; suivant : 001295

Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery

Auteurs : S. Alvain [France] ; C. Moulin [France] ; Y. Dandonneau [France] ; F. M. Breon [France]

Source :

Deep-sea research. Part 1. Oceanographic research papers [ 0967-0637 ] ; 2005.

RBID : Pascal:05-0466139

Descripteurs français

Pascal (Inist)
- Télédétection, Phytoplancton, Couleur, In situ, Propriété optique, Océan Atlantique Nord, Océan Pacifique équatorial, Milieu marin, Eau profonde, Océan Pacifique Equatorial.
Wicri :
- topic : Télédétection, Milieu marin.
mix :
- couleur de l'océan, groupes fonctionnels, phytoplancton.

English descriptors

KwdEn :
- Color, Deep water, Equatorial Pacific, In situ, Marine environment, North Atlantic, Optical properties, Phytoplankton, Remote sensing.

Abstract

Ocean color sensors enable a quasi-permanent monitoring of the chlorophyll a concentration (Chl a) in surface waters. This ubiquitous photosynthetic pigment cannot, however, be used to distinguish between phytoplankton species. Distinguishing phytoplankton groups from space is nevertheless necessary to better study some biochemical processes such as carbon fixation at the global scale, and is thus one of the major challenges of ocean color research. In situ data have shown that the water-leaving radiances (nLw), measured by ocean color sensors at different wavelengths in the visible spectrum, vary significantly for a given Chl a. This natural variability is due partly to differences in optical properties of phytoplankton species. Here, we derive relationships between nLw and phytoplankton species by using a large set of quantitative inventories of phytoplankton pigments collected during nine cruises from Le Havre (France) to Nouméa (New Caledonia) in the framework of the GeP&CO program. Coincident SeaWiFS nLw data between 412 and 555 mn are extracted and normalized to remove the effect of Chl a. These normalized spectra vary significantly with in situ pigment composition, so that four major phytoplankton groups, i.e., haptophytes, Prochlorococcus, Synechococcus-like cyanobacteria and diatoms, can be distinguished. This classification (PHYSAT) is applied to the global SeaWiFS dataset for year 2001, and global maps of phytoplankton groups are presented. Haptophytes and diatoms are found mostly in high latitudes and in eutrophic regions. Diatoms show a strong seasonal cycle with large-scale blooms during spring and summer. These results, obtained with only five channels in the visible spectrum, demonstrate that ocean color measurements can be used to discriminate between dominant phytoplankton groups provided that sufficient data are available to establish the necessary empirical relationships.

Url:

https://hal.archives-ouvertes.fr/hal-00156839

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Le document en format XML

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<author><name sortKey="Moulin, Cyril" sort="Moulin, Cyril" uniqKey="Moulin C" first="Cyril" last="Moulin">Cyril Moulin</name>
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<country>France</country>
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<orgName type="university">Université de Versailles-Saint-Quentin-en-Yvelines</orgName>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">REMOTE SENSING OF PHYTOPLANKTON GROUPS IN CASE 1 WATERS FROM GLOBAL SEAWIFS IMAGERY</title>
<author><name sortKey="Alvain, Severine" sort="Alvain, Severine" uniqKey="Alvain S" first="Séverine" last="Alvain">Séverine Alvain</name>
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</address>
<ref type="url">https://www.universite-paris-saclay.fr/fr</ref>
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</hal:affiliation>
<country>France</country>
<placeName><settlement type="city">Versailles</settlement>
<region type="region" nuts="2">Île-de-France</region>
</placeName>
<orgName type="university">Université de Versailles-Saint-Quentin-en-Yvelines</orgName>
</affiliation>
</author>
<author><name sortKey="Moulin, Cyril" sort="Moulin, Cyril" uniqKey="Moulin C" first="Cyril" last="Moulin">Cyril Moulin</name>
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<country>France</country>
<placeName><settlement type="city">Versailles</settlement>
<region type="region" nuts="2">Île-de-France</region>
</placeName>
<orgName type="university">Université de Versailles-Saint-Quentin-en-Yvelines</orgName>
</affiliation>
</author>
<author><name sortKey="Dandonneau, Yves" sort="Dandonneau, Yves" uniqKey="Dandonneau Y" first="Yves" last="Dandonneau">Yves Dandonneau</name>
</author>
<author><name sortKey="Breon, Francois Marie" sort="Breon, Francois Marie" uniqKey="Breon F" first="François-Marie" last="Bréon">François-Marie Bréon</name>
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<desc><address><addrLine>Centre de SaclayCentre de GrenobleCentre de Cadaracheetc</addrLine>
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<country>France</country>
<placeName><settlement type="city">Versailles</settlement>
<region type="region" nuts="2">Île-de-France</region>
</placeName>
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</analytic>
<idno type="DOI">10.1016/j.dsr.2005.06.015</idno>
<series><title level="j">Deep Sea Research Part I: Oceanographic Research Papers</title>
<idno type="ISSN">0967-0637</idno>
<imprint><date type="datePub">2005-11-15</date>
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</sourceDesc>
</fileDesc>
<profileDesc><textClass><keywords scheme="mix" xml:lang="fr"><term>couleur de l'océan</term>
<term>groupes fonctionnels</term>
<term>phytoplancton</term>
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</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Ocean color sensors enable a quasi-permanent monitoring of the chlorophyll a concentration, Chl a, in surface waters. This ubiquitous photosynthetic pigment cannot, however, be used to distinguish between phytoplankton species. Distinguishing phytoplankton groups from space is nevertheless necessary to better study some biochemical processes such as carbon fixation at the global scale, and is thus one of the major challenges of ocean color research. In situ data have shown that the water-leaving radiances (nLw), measured by ocean color sensors at different wavelengths in the visible spectrum, vary significantly for a given Chl a. This natural variability is due partly to differences in optical properties of phytoplankton species. Here we derive relationships between nLw and phytoplankton species by using a large set of quantitative inventories of phytoplankton pigments collected during nine cruises from Le Havre (France) to Nouméa (New Caledonia) in the framework of the GeP&CO program. Coincident SeaWiFS nLw data between 412 and 555 nm are extracted and normalized to remove the effect of Chl a. These normalized spectra vary significantly with in-situ pigment composition, so that four major phytoplankton groups, i.e., haptophytes, Prochlorococcus, Synechococcus-like cyanobacteria and diatoms, can be distinguished. This classification (PHYSAT) is applied to the global SeaWiFS dataset for year 2001, and global maps of phytoplankton groups are 1 presented. Haptophytes and diatoms are found mostly in high latitudes and in eutrophic regions. Diatoms show a strong seasonal cycle with large-scale blooms during spring and summer. These results, obtained with only five channels in the visible spectrum, demonstrate that ocean color measurements can be used to discriminate between dominant phytoplankton groups provided that sufficient data are available to establish the necessary empirical relationships.</div>
</front>
</TEI>
</HAL>
</double>
</record>

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   |texte=   Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery
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Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery

Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery

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