Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery
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| Title: | Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery |
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| Authors: | Alvain, S.1, Moulin, C.1 cyril.moulin@cea.fr, Dandonneau, Y.2, Bréon, F.M.1 |
| Source: | Deep-Sea Research Part I, Oceanographic Research Papers. Nov2005, Vol. 52 Issue 11, p1989-2004. 16p. |
| Subjects: | Phytoplankton, Optical oceanography, Remote sensing, Detectors |
| Abstract: | 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 555nm 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. [Copyright &y& Elsevier] |
| Copyright of Deep-Sea Research Part I, Oceanographic Research Papers is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 18627909 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Alvain%2C+S%2E%22">Alvain, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Moulin%2C+C%2E%22">Moulin, C.</searchLink><relatesTo>1</relatesTo><i> cyril.moulin@cea.fr</i><br /><searchLink fieldCode="AR" term="%22Dandonneau%2C+Y%2E%22">Dandonneau, Y.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Bréon%2C+F%2EM%2E%22">Bréon, F.M.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Deep-Sea+Research+Part+I%2C+Oceanographic+Research+Papers%22">Deep-Sea Research Part I, Oceanographic Research Papers</searchLink>. Nov2005, Vol. 52 Issue 11, p1989-2004. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Phytoplankton%22">Phytoplankton</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+oceanography%22">Optical oceanography</searchLink><br /><searchLink fieldCode="DE" term="%22Remote+sensing%22">Remote sensing</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: 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 555nm 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. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Deep-Sea Research Part I, Oceanographic Research Papers is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.dsr.2005.06.015 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 1989 Subjects: – SubjectFull: Phytoplankton Type: general – SubjectFull: Optical oceanography Type: general – SubjectFull: Remote sensing Type: general – SubjectFull: Detectors Type: general Titles: – TitleFull: Remote sensing of phytoplankton groups in case 1 waters from global SeaWiFS imagery Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Alvain, S. – PersonEntity: Name: NameFull: Moulin, C. – PersonEntity: Name: NameFull: Dandonneau, Y. – PersonEntity: Name: NameFull: Bréon, F.M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2005 Type: published Y: 2005 Identifiers: – Type: issn-print Value: 09670637 Numbering: – Type: volume Value: 52 – Type: issue Value: 11 Titles: – TitleFull: Deep-Sea Research Part I, Oceanographic Research Papers Type: main |
| ResultId | 1 |
