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Optical characterization of marine phytoplankton assemblages within surface waters of the western Arctic Ocean

An extensive data set of measurements within the Chukchi and Beaufort Seas is used to characterize the optical properties of seawater associated with different phytoplankton communities. Hierarchical cluster analysis of diagnostic pigment concentrations partitioned stations into four distinct surfac...

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Detalles Bibliográficos
Autores principales: Reynolds, Rick A., Stramski, Dariusz
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley & Sons, Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6919934/
https://www.ncbi.nlm.nih.gov/pubmed/31894158
http://dx.doi.org/10.1002/lno.11199
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author Reynolds, Rick A.
Stramski, Dariusz
author_facet Reynolds, Rick A.
Stramski, Dariusz
author_sort Reynolds, Rick A.
collection PubMed
description An extensive data set of measurements within the Chukchi and Beaufort Seas is used to characterize the optical properties of seawater associated with different phytoplankton communities. Hierarchical cluster analysis of diagnostic pigment concentrations partitioned stations into four distinct surface phytoplankton communities based on taxonomic composition and average cell size. Concurrent optical measurements of spectral absorption and backscattering coefficients and remote‐sensing reflectance were used to characterize the magnitudes and spectral shapes of seawater optical properties associated with each phytoplankton assemblage. The results demonstrate measurable differences among communities in the average spectral shapes of the phytoplankton absorption coefficient. Similar or smaller differences were also observed in the spectral shapes of nonphytoplankton absorption coefficients and the particulate backscattering coefficient. Phytoplankton on average, however, contributed only 25% or less to the total absorption coefficient of seawater. Our analyses indicate that the interplay between the magnitudes and relative contributions of all optically significant constituents generally dampens any influence of varying phytoplankton absorption spectral shapes on the total absorption coefficient, yet there is still a marked discrimination observed in the spectral shape of the ratio of the total backscattering to total absorption coefficient and remote‐sensing reflectance among the phytoplankton assemblages. These spectral variations arise mainly from differences in the bio‐optical environment in which specific communities were found, as opposed to differences in the spectral shapes of phytoplankton optical properties per se. These results suggest potential approaches for the development of algorithms to assess phytoplankton community composition from measurements of seawater optical properties in western Arctic waters.
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spelling pubmed-69199342019-12-30 Optical characterization of marine phytoplankton assemblages within surface waters of the western Arctic Ocean Reynolds, Rick A. Stramski, Dariusz Limnol Oceanogr Articles An extensive data set of measurements within the Chukchi and Beaufort Seas is used to characterize the optical properties of seawater associated with different phytoplankton communities. Hierarchical cluster analysis of diagnostic pigment concentrations partitioned stations into four distinct surface phytoplankton communities based on taxonomic composition and average cell size. Concurrent optical measurements of spectral absorption and backscattering coefficients and remote‐sensing reflectance were used to characterize the magnitudes and spectral shapes of seawater optical properties associated with each phytoplankton assemblage. The results demonstrate measurable differences among communities in the average spectral shapes of the phytoplankton absorption coefficient. Similar or smaller differences were also observed in the spectral shapes of nonphytoplankton absorption coefficients and the particulate backscattering coefficient. Phytoplankton on average, however, contributed only 25% or less to the total absorption coefficient of seawater. Our analyses indicate that the interplay between the magnitudes and relative contributions of all optically significant constituents generally dampens any influence of varying phytoplankton absorption spectral shapes on the total absorption coefficient, yet there is still a marked discrimination observed in the spectral shape of the ratio of the total backscattering to total absorption coefficient and remote‐sensing reflectance among the phytoplankton assemblages. These spectral variations arise mainly from differences in the bio‐optical environment in which specific communities were found, as opposed to differences in the spectral shapes of phytoplankton optical properties per se. These results suggest potential approaches for the development of algorithms to assess phytoplankton community composition from measurements of seawater optical properties in western Arctic waters. John Wiley & Sons, Inc. 2019-05-30 2019-11 /pmc/articles/PMC6919934/ /pubmed/31894158 http://dx.doi.org/10.1002/lno.11199 Text en © 2019 The Authors. Limnology and Oceanography published by Wiley Periodicals, Inc. on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Articles
Reynolds, Rick A.
Stramski, Dariusz
Optical characterization of marine phytoplankton assemblages within surface waters of the western Arctic Ocean
title Optical characterization of marine phytoplankton assemblages within surface waters of the western Arctic Ocean
title_full Optical characterization of marine phytoplankton assemblages within surface waters of the western Arctic Ocean
title_fullStr Optical characterization of marine phytoplankton assemblages within surface waters of the western Arctic Ocean
title_full_unstemmed Optical characterization of marine phytoplankton assemblages within surface waters of the western Arctic Ocean
title_short Optical characterization of marine phytoplankton assemblages within surface waters of the western Arctic Ocean
title_sort optical characterization of marine phytoplankton assemblages within surface waters of the western arctic ocean
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6919934/
https://www.ncbi.nlm.nih.gov/pubmed/31894158
http://dx.doi.org/10.1002/lno.11199
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