Sediment-Associated Phytoplankton Release From the Seafloor in Response to Wind-Induced Barotropic Currents in the Bering Strait
Bering Strait is the single gateway between the Arctic and Pacific Oceans, and has localized strong currents, which can exceed 100 cm s^-1. Although massive spring phytoplankton blooms and the subsequent production of particulate organic matter that sinks to the seafloor are observed in the surround...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/73743 2023-05-15T15:00:43+02:00 Sediment-Associated Phytoplankton Release From the Seafloor in Response to Wind-Induced Barotropic Currents in the Bering Strait Abe, Hiroto Sampei, Makoto Hirawake, Toru Waga, Hisatomo Nishino, Shigeto Ooki, Atsushi http://hdl.handle.net/2115/73743 https://doi.org/10.3389/fmars.2019.00097 eng eng Frontiers Media http://hdl.handle.net/2115/73743 Frontiers in marine science, 6: UNSP 97 http://dx.doi.org/10.3389/fmars.2019.00097 https://creativecommons.org/licenses/by/4.0/ CC-BY carbon cycle sediment resuspension wind-induced current phytoplankton biological hotspot Pacific Arctic 660 article fthokunivhus https://doi.org/10.3389/fmars.2019.00097 2022-11-18T01:05:24Z Bering Strait is the single gateway between the Arctic and Pacific Oceans, and has localized strong currents, which can exceed 100 cm s^-1. Although massive spring phytoplankton blooms and the subsequent production of particulate organic matter that sinks to the seafloor are observed in the surrounding regions of the Bering Strait, the impact of the locally strong current on the horizontal and vertical transport of the particles remains unclear. Therefore, we conducted year-round mooring measurements from 2016 to 2017 by focusing on near-bottom processes associated with ocean currents. Our time-series analysis showed that high-turbidity events, triggered by strong barotropic currents, occurred near the seafloor in all seasons. Consequently, the fluorescence sensor detected highly concentrated chlorophyll a in the resuspended sediment; however, the amount of chlorophyll a release was seasonal, with large and small amounts being released during the warm and cold seasons, respectively. The small amounts of chlorophyll a may be attributed to small amounts of phytoplankton in the sediment owing to less input of fresh phytoplankton from the overlaying water column and organic matter decomposition in the sediments under no-light conditions. The barotropic currents were modulated by surface winds associated with an intercontinental atmospheric pattern having a 5000-km spatial scale on a timescale of 6 days. The locally strong ocean current in the Bering Strait, driving the upward transport of sediment and the subsequent horizontal transport, may play a vital role in supplying particulate organic matter/phytoplankton/nutrients to the downstream region of the southern Chukchi Sea where the formation of biological hotspots is reported. Article in Journal/Newspaper Arctic Bering Strait Chukchi Chukchi Sea Pacific Arctic Phytoplankton Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Arctic Bering Strait Chukchi Sea Pacific Frontiers in Marine Science 6 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
carbon cycle sediment resuspension wind-induced current phytoplankton biological hotspot Pacific Arctic 660 |
spellingShingle |
carbon cycle sediment resuspension wind-induced current phytoplankton biological hotspot Pacific Arctic 660 Abe, Hiroto Sampei, Makoto Hirawake, Toru Waga, Hisatomo Nishino, Shigeto Ooki, Atsushi Sediment-Associated Phytoplankton Release From the Seafloor in Response to Wind-Induced Barotropic Currents in the Bering Strait |
topic_facet |
carbon cycle sediment resuspension wind-induced current phytoplankton biological hotspot Pacific Arctic 660 |
description |
Bering Strait is the single gateway between the Arctic and Pacific Oceans, and has localized strong currents, which can exceed 100 cm s^-1. Although massive spring phytoplankton blooms and the subsequent production of particulate organic matter that sinks to the seafloor are observed in the surrounding regions of the Bering Strait, the impact of the locally strong current on the horizontal and vertical transport of the particles remains unclear. Therefore, we conducted year-round mooring measurements from 2016 to 2017 by focusing on near-bottom processes associated with ocean currents. Our time-series analysis showed that high-turbidity events, triggered by strong barotropic currents, occurred near the seafloor in all seasons. Consequently, the fluorescence sensor detected highly concentrated chlorophyll a in the resuspended sediment; however, the amount of chlorophyll a release was seasonal, with large and small amounts being released during the warm and cold seasons, respectively. The small amounts of chlorophyll a may be attributed to small amounts of phytoplankton in the sediment owing to less input of fresh phytoplankton from the overlaying water column and organic matter decomposition in the sediments under no-light conditions. The barotropic currents were modulated by surface winds associated with an intercontinental atmospheric pattern having a 5000-km spatial scale on a timescale of 6 days. The locally strong ocean current in the Bering Strait, driving the upward transport of sediment and the subsequent horizontal transport, may play a vital role in supplying particulate organic matter/phytoplankton/nutrients to the downstream region of the southern Chukchi Sea where the formation of biological hotspots is reported. |
format |
Article in Journal/Newspaper |
author |
Abe, Hiroto Sampei, Makoto Hirawake, Toru Waga, Hisatomo Nishino, Shigeto Ooki, Atsushi |
author_facet |
Abe, Hiroto Sampei, Makoto Hirawake, Toru Waga, Hisatomo Nishino, Shigeto Ooki, Atsushi |
author_sort |
Abe, Hiroto |
title |
Sediment-Associated Phytoplankton Release From the Seafloor in Response to Wind-Induced Barotropic Currents in the Bering Strait |
title_short |
Sediment-Associated Phytoplankton Release From the Seafloor in Response to Wind-Induced Barotropic Currents in the Bering Strait |
title_full |
Sediment-Associated Phytoplankton Release From the Seafloor in Response to Wind-Induced Barotropic Currents in the Bering Strait |
title_fullStr |
Sediment-Associated Phytoplankton Release From the Seafloor in Response to Wind-Induced Barotropic Currents in the Bering Strait |
title_full_unstemmed |
Sediment-Associated Phytoplankton Release From the Seafloor in Response to Wind-Induced Barotropic Currents in the Bering Strait |
title_sort |
sediment-associated phytoplankton release from the seafloor in response to wind-induced barotropic currents in the bering strait |
publisher |
Frontiers Media |
url |
http://hdl.handle.net/2115/73743 https://doi.org/10.3389/fmars.2019.00097 |
geographic |
Arctic Bering Strait Chukchi Sea Pacific |
geographic_facet |
Arctic Bering Strait Chukchi Sea Pacific |
genre |
Arctic Bering Strait Chukchi Chukchi Sea Pacific Arctic Phytoplankton |
genre_facet |
Arctic Bering Strait Chukchi Chukchi Sea Pacific Arctic Phytoplankton |
op_relation |
http://hdl.handle.net/2115/73743 Frontiers in marine science, 6: UNSP 97 http://dx.doi.org/10.3389/fmars.2019.00097 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2019.00097 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
_version_ |
1766332795684126720 |