Remote sensing of size structure of phytoplankton communities using optical properties of the Chukchi and Bering Sea shelf region
Recent ocean warming and subsequent sea ice decline resulting from climate change could affect the northward shift of the ecosystem structure in the Chukchi Sea and Bering Sea shelf region (Grebmeier et al., 2006b). The size structure of phytoplankton communities provides an index of trophic levels...
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ftdoajarticles:oai:doaj.org/article:d0b1670f4b2549dc9b3a35516bca85de 2023-05-15T15:43:39+02:00 Remote sensing of size structure of phytoplankton communities using optical properties of the Chukchi and Bering Sea shelf region A. Fujiwara T. Hirawake K. Suzuki S.-I. Saitoh 2011-12-01T00:00:00Z https://doi.org/10.5194/bg-8-3567-2011 https://doaj.org/article/d0b1670f4b2549dc9b3a35516bca85de EN eng Copernicus Publications http://www.biogeosciences.net/8/3567/2011/bg-8-3567-2011.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-8-3567-2011 1726-4170 1726-4189 https://doaj.org/article/d0b1670f4b2549dc9b3a35516bca85de Biogeosciences, Vol 8, Iss 12, Pp 3567-3580 (2011) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2011 ftdoajarticles https://doi.org/10.5194/bg-8-3567-2011 2022-12-31T12:38:40Z Recent ocean warming and subsequent sea ice decline resulting from climate change could affect the northward shift of the ecosystem structure in the Chukchi Sea and Bering Sea shelf region (Grebmeier et al., 2006b). The size structure of phytoplankton communities provides an index of trophic levels that is crucial to understanding the mechanisms underlying such ecosystem changes and their implications for the future. This study proposes a new ocean color algorithm for deriving this characteristic by using the region's optical properties. The size derivation model (SDM) estimates the phytoplankton size index F L on the basis of size-fractionated chlorophyll- a (chl- a ) using the light absorption coefficient of phytoplankton, a ph (λ), and the backscattering coefficient of suspended particles including algae, b bp (λ). F L was defined as the ratio of algal biomass attributed to cells larger than 5 μm to the total. It was expressed by a multiple regression model using the a ph (λ) ratio, a ph (488)/ a ph (555), which varies with phytoplankton pigment composition, and the spectral slope of b bp (λ), γ, which is an index of the mean suspended particle size. A validation study demonstrated that 69% of unknown data are correctly derived within F L range of ±20%. The spatial distributions of F L for the cold August of 2006 and the warm August of 2007 were compared to examine application of the SDM to satellite remote sensing. The results suggested that phytoplankton size was responsive to changes in sea surface temperature. Further analysis of satellite-derived F L values and other environmental factors can advance our understanding of ecosystem structure changes in the shelf region of the Chukchi and Bering Seas. Article in Journal/Newspaper Bering Sea Chukchi Chukchi Sea Sea ice Directory of Open Access Journals: DOAJ Articles Bering Sea Chukchi Sea Biogeosciences 8 12 3567 3580 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 A. Fujiwara T. Hirawake K. Suzuki S.-I. Saitoh Remote sensing of size structure of phytoplankton communities using optical properties of the Chukchi and Bering Sea shelf region |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Recent ocean warming and subsequent sea ice decline resulting from climate change could affect the northward shift of the ecosystem structure in the Chukchi Sea and Bering Sea shelf region (Grebmeier et al., 2006b). The size structure of phytoplankton communities provides an index of trophic levels that is crucial to understanding the mechanisms underlying such ecosystem changes and their implications for the future. This study proposes a new ocean color algorithm for deriving this characteristic by using the region's optical properties. The size derivation model (SDM) estimates the phytoplankton size index F L on the basis of size-fractionated chlorophyll- a (chl- a ) using the light absorption coefficient of phytoplankton, a ph (λ), and the backscattering coefficient of suspended particles including algae, b bp (λ). F L was defined as the ratio of algal biomass attributed to cells larger than 5 μm to the total. It was expressed by a multiple regression model using the a ph (λ) ratio, a ph (488)/ a ph (555), which varies with phytoplankton pigment composition, and the spectral slope of b bp (λ), γ, which is an index of the mean suspended particle size. A validation study demonstrated that 69% of unknown data are correctly derived within F L range of ±20%. The spatial distributions of F L for the cold August of 2006 and the warm August of 2007 were compared to examine application of the SDM to satellite remote sensing. The results suggested that phytoplankton size was responsive to changes in sea surface temperature. Further analysis of satellite-derived F L values and other environmental factors can advance our understanding of ecosystem structure changes in the shelf region of the Chukchi and Bering Seas. |
format |
Article in Journal/Newspaper |
author |
A. Fujiwara T. Hirawake K. Suzuki S.-I. Saitoh |
author_facet |
A. Fujiwara T. Hirawake K. Suzuki S.-I. Saitoh |
author_sort |
A. Fujiwara |
title |
Remote sensing of size structure of phytoplankton communities using optical properties of the Chukchi and Bering Sea shelf region |
title_short |
Remote sensing of size structure of phytoplankton communities using optical properties of the Chukchi and Bering Sea shelf region |
title_full |
Remote sensing of size structure of phytoplankton communities using optical properties of the Chukchi and Bering Sea shelf region |
title_fullStr |
Remote sensing of size structure of phytoplankton communities using optical properties of the Chukchi and Bering Sea shelf region |
title_full_unstemmed |
Remote sensing of size structure of phytoplankton communities using optical properties of the Chukchi and Bering Sea shelf region |
title_sort |
remote sensing of size structure of phytoplankton communities using optical properties of the chukchi and bering sea shelf region |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/bg-8-3567-2011 https://doaj.org/article/d0b1670f4b2549dc9b3a35516bca85de |
geographic |
Bering Sea Chukchi Sea |
geographic_facet |
Bering Sea Chukchi Sea |
genre |
Bering Sea Chukchi Chukchi Sea Sea ice |
genre_facet |
Bering Sea Chukchi Chukchi Sea Sea ice |
op_source |
Biogeosciences, Vol 8, Iss 12, Pp 3567-3580 (2011) |
op_relation |
http://www.biogeosciences.net/8/3567/2011/bg-8-3567-2011.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-8-3567-2011 1726-4170 1726-4189 https://doaj.org/article/d0b1670f4b2549dc9b3a35516bca85de |
op_doi |
https://doi.org/10.5194/bg-8-3567-2011 |
container_title |
Biogeosciences |
container_volume |
8 |
container_issue |
12 |
container_start_page |
3567 |
op_container_end_page |
3580 |
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1766377836781764608 |