Environmental drivers of spring primary production in Hudson Bay
Pertinent environmental factors influencing the microalgal bloom during sea-ice breakup in Hudson Bay were investigated in June 2018, producing the first observations of late spring primary production in the offshore waters of this vast inland sea. Phytoplankton production was found to commence at t...
Published in: | Elementa: Science of the Anthropocene |
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Language: | English |
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University of California Press
2021
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Online Access: | http://dx.doi.org/10.1525/elementa.2020.00160 http://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2020.00160/465071/elementa.2020.00160.pdf |
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crunicaliforniap:10.1525/elementa.2020.00160 2024-03-03T08:41:41+00:00 Environmental drivers of spring primary production in Hudson Bay Matthes, L. C. Ehn, J. K. Dalman, L. A. Babb, D. G. Peeken, I. Harasyn, M. Kirillov, S. Lee, J. Bélanger, S. Tremblay, J.-É. Barber, D. G. Mundy, C. J. 2021 http://dx.doi.org/10.1525/elementa.2020.00160 http://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2020.00160/465071/elementa.2020.00160.pdf en eng University of California Press http://creativecommons.org/licenses/by/4.0/ Elementa: Science of the Anthropocene volume 9, issue 1 ISSN 2325-1026 Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography journal-article 2021 crunicaliforniap https://doi.org/10.1525/elementa.2020.00160 2024-02-03T23:24:38Z Pertinent environmental factors influencing the microalgal bloom during sea-ice breakup in Hudson Bay were investigated in June 2018, producing the first observations of late spring primary production in the offshore waters of this vast inland sea. Phytoplankton production was found to commence at the onset of ice melt, with surface nutrient depletion leading to the formation of a subsurface chlorophyll maximum in the open waters of western Hudson Bay. Concurrently, the melting mobile ice cover in central Hudson Bay created favorable conditions for a diatom-dominated under-ice bloom, with photosynthetic characteristics and relatively high production confirming that phytoplankton cells were able to acclimate to increasing light levels. Lower mean values of phytoplankton production and total chlorophyll a (TChl a) concentration observed under the sea ice (414 mg C m–2 d–1 and 33.7 mg TChl a m–2) than those observed in open waters during the late bloom stage in the western region (460 mg C m–2 d–1 and 53.5 mg TChl a m–2) were attributed to reduced under-ice light levels and low surface concentrations of dissolved inorganic nitrogen (<2 μmol L–1) in central Hudson Bay. However, the highly abundant subice diatom, Melosira arctica, was estimated to contribute an additional 378 mg C m–2 d–1 to under-ice production in this region. Therefore, this subice algal bloom appears to play a similar role in the seasonally ice-covered sub-Arctic as in the central Arctic Ocean where it contributes significantly to local production. By updating historical total production estimates of Hudson Bay ranging between 21.5 and 39 g C m–2 yr–1 with our late spring observations including the novel observation of M. arctica, annual production was recalculated to be 72 g C m–2 yr–1, which equates to mean values for interior Arctic shelves. Article in Journal/Newspaper Arctic Arctic Ocean Hudson Bay Phytoplankton Sea ice University of California Press Arctic Arctic Ocean Hudson Hudson Bay Elementa: Science of the Anthropocene 9 1 |
institution |
Open Polar |
collection |
University of California Press |
op_collection_id |
crunicaliforniap |
language |
English |
topic |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography |
spellingShingle |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography Matthes, L. C. Ehn, J. K. Dalman, L. A. Babb, D. G. Peeken, I. Harasyn, M. Kirillov, S. Lee, J. Bélanger, S. Tremblay, J.-É. Barber, D. G. Mundy, C. J. Environmental drivers of spring primary production in Hudson Bay |
topic_facet |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography |
description |
Pertinent environmental factors influencing the microalgal bloom during sea-ice breakup in Hudson Bay were investigated in June 2018, producing the first observations of late spring primary production in the offshore waters of this vast inland sea. Phytoplankton production was found to commence at the onset of ice melt, with surface nutrient depletion leading to the formation of a subsurface chlorophyll maximum in the open waters of western Hudson Bay. Concurrently, the melting mobile ice cover in central Hudson Bay created favorable conditions for a diatom-dominated under-ice bloom, with photosynthetic characteristics and relatively high production confirming that phytoplankton cells were able to acclimate to increasing light levels. Lower mean values of phytoplankton production and total chlorophyll a (TChl a) concentration observed under the sea ice (414 mg C m–2 d–1 and 33.7 mg TChl a m–2) than those observed in open waters during the late bloom stage in the western region (460 mg C m–2 d–1 and 53.5 mg TChl a m–2) were attributed to reduced under-ice light levels and low surface concentrations of dissolved inorganic nitrogen (<2 μmol L–1) in central Hudson Bay. However, the highly abundant subice diatom, Melosira arctica, was estimated to contribute an additional 378 mg C m–2 d–1 to under-ice production in this region. Therefore, this subice algal bloom appears to play a similar role in the seasonally ice-covered sub-Arctic as in the central Arctic Ocean where it contributes significantly to local production. By updating historical total production estimates of Hudson Bay ranging between 21.5 and 39 g C m–2 yr–1 with our late spring observations including the novel observation of M. arctica, annual production was recalculated to be 72 g C m–2 yr–1, which equates to mean values for interior Arctic shelves. |
format |
Article in Journal/Newspaper |
author |
Matthes, L. C. Ehn, J. K. Dalman, L. A. Babb, D. G. Peeken, I. Harasyn, M. Kirillov, S. Lee, J. Bélanger, S. Tremblay, J.-É. Barber, D. G. Mundy, C. J. |
author_facet |
Matthes, L. C. Ehn, J. K. Dalman, L. A. Babb, D. G. Peeken, I. Harasyn, M. Kirillov, S. Lee, J. Bélanger, S. Tremblay, J.-É. Barber, D. G. Mundy, C. J. |
author_sort |
Matthes, L. C. |
title |
Environmental drivers of spring primary production in Hudson Bay |
title_short |
Environmental drivers of spring primary production in Hudson Bay |
title_full |
Environmental drivers of spring primary production in Hudson Bay |
title_fullStr |
Environmental drivers of spring primary production in Hudson Bay |
title_full_unstemmed |
Environmental drivers of spring primary production in Hudson Bay |
title_sort |
environmental drivers of spring primary production in hudson bay |
publisher |
University of California Press |
publishDate |
2021 |
url |
http://dx.doi.org/10.1525/elementa.2020.00160 http://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2020.00160/465071/elementa.2020.00160.pdf |
geographic |
Arctic Arctic Ocean Hudson Hudson Bay |
geographic_facet |
Arctic Arctic Ocean Hudson Hudson Bay |
genre |
Arctic Arctic Ocean Hudson Bay Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Ocean Hudson Bay Phytoplankton Sea ice |
op_source |
Elementa: Science of the Anthropocene volume 9, issue 1 ISSN 2325-1026 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1525/elementa.2020.00160 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
9 |
container_issue |
1 |
_version_ |
1792497326139375616 |