LeHavreV1, PascalFrancis, Corpus, bibRecord, 000224

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

Identifieur interne : 000224 ( PascalFrancis/Corpus ); précédent : 000223; suivant : 000225

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

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

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.

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.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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Format Inist (serveur)

NO :	PASCAL 05-0466139 INIST
ET :	Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery
AU :	ALVAIN (S.); MOULIN (C.); DANDONNEAU (Y.); BREON (F. M.)
AF :	IPSL/LSCE, CEA Saclay/Gif-sur-Yvette 91191/France (1 aut., 2 aut., 4 aut.); IRD-IPSL/LOCEAN, 4 place Jussieu/Paris 75252/France (3 aut.)
DT :	Publication en série; Niveau analytique
SO :	Deep-sea research. Part 1. Oceanographic research papers; ISSN 0967-0637; Royaume-Uni; Da. 2005; Vol. 52; No. 11; Pp. 1989-2004; Bibl. 1 p.1/4
LA :	Anglais
EA :	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.
CC :	002A14B04E; 002A14A03
FD :	Télédétection; Phytoplancton; Couleur; In situ; Propriété optique; Océan Atlantique Nord; Océan Pacifique équatorial; Milieu marin; Eau profonde; Océan Pacifique Equatorial
FG :	Océan Atlantique; Océan Pacifique; Plancton
ED :	Remote sensing; Phytoplankton; Color; In situ; Optical properties; North Atlantic; Equatorial Pacific; Marine environment; Deep water; Equatorial Pacific
EG :	Atlantic Ocean; Pacific Ocean; Plankton
SD :	Teledetección; Fitoplancton; Color; In situ; Propiedad óptica; Océano Atlántico Norte; Océano Pacífico ecuatorial; Medio marino; Agua profunda
LO :	INIST-7679A1.354000132757230010
ID :	05-0466139

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Pascal:05-0466139

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<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 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.</div>
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<s5>05</s5>
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<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Océan Atlantique Nord</s0>
<s2>NG</s2>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>North Atlantic</s0>
<s2>NG</s2>
<s5>06</s5>
</fC03>
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<s2>NG</s2>
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</fC03>
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<s2>NG</s2>
<s5>07</s5>
</fC03>
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<s2>NG</s2>
<s5>07</s5>
</fC03>
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<s2>NG</s2>
<s5>07</s5>
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<s5>08</s5>
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<fC03 i1="09" i2="X" l="FRE"><s0>Eau profonde</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Deep water</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Agua profunda</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Océan Pacifique Equatorial</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Equatorial Pacific</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE"><s0>Océan Atlantique</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG"><s0>Atlantic Ocean</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA"><s0>Océano Atlántico</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE"><s0>Océan Pacifique</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG"><s0>Pacific Ocean</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA"><s0>Océano Pacífico</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE"><s0>Plancton</s0>
<s5>17</s5>
</fC07>
<fC07 i1="03" i2="X" l="ENG"><s0>Plankton</s0>
<s5>17</s5>
</fC07>
<fC07 i1="03" i2="X" l="SPA"><s0>Plancton</s0>
<s5>17</s5>
</fC07>
<fN21><s1>325</s1>
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<server><NO>PASCAL 05-0466139 INIST</NO>
<ET>Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery</ET>
<AU>ALVAIN (S.); MOULIN (C.); DANDONNEAU (Y.); BREON (F. M.)</AU>
<AF>IPSL/LSCE, CEA Saclay/Gif-sur-Yvette 91191/France (1 aut., 2 aut., 4 aut.); IRD-IPSL/LOCEAN, 4 place Jussieu/Paris 75252/France (3 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Deep-sea research. Part 1. Oceanographic research papers; ISSN 0967-0637; Royaume-Uni; Da. 2005; Vol. 52; No. 11; Pp. 1989-2004; Bibl. 1 p.1/4</SO>
<LA>Anglais</LA>
<EA>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.</EA>
<CC>002A14B04E; 002A14A03</CC>
<FD>Télédétection; Phytoplancton; Couleur; In situ; Propriété optique; Océan Atlantique Nord; Océan Pacifique équatorial; Milieu marin; Eau profonde; Océan Pacifique Equatorial</FD>
<FG>Océan Atlantique; Océan Pacifique; Plancton</FG>
<ED>Remote sensing; Phytoplankton; Color; In situ; Optical properties; North Atlantic; Equatorial Pacific; Marine environment; Deep water; Equatorial Pacific</ED>
<EG>Atlantic Ocean; Pacific Ocean; Plankton</EG>
<SD>Teledetección; Fitoplancton; Color; In situ; Propiedad óptica; Océano Atlántico Norte; Océano Pacífico ecuatorial; Medio marino; Agua profunda</SD>
<LO>INIST-7679A1.354000132757230010</LO>
<ID>05-0466139</ID>
</server>
</inist>
</record>

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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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