Characteristics and Transformation of Pacific Winter Water on the Chukchi Sea Shelf in Late Spring
Data from a late spring survey of the northeast Chukchi Sea are used to investigate various aspects of newly ventilated winter water (NVWW). More than 96% of the water sampled on the shelf was NVWW, the saltiest (densest) of which tended to be in the main flow pathways on the shelf. Nearly all of th...
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Online Access: | https://hdl.handle.net/1956/22350 https://doi.org/10.1029/2019jc015261 |
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ftunivbergen:oai:bora.uib.no:1956/22350 2023-05-15T15:44:16+02:00 Characteristics and Transformation of Pacific Winter Water on the Chukchi Sea Shelf in Late Spring Pacini, Astrid Moore, George William Kent Pickart, Robert S. Nobre, Carolina Bahr, Frank Våge, Kjetil Arrigo, Kevin R. 2020-02-11T10:23:33Z application/pdf https://hdl.handle.net/1956/22350 https://doi.org/10.1029/2019jc015261 eng eng American Geophysical Union Trond Mohn stiftelse: BFS2016REK01 urn:issn:2169-9291 urn:issn:2169-9275 https://hdl.handle.net/1956/22350 https://doi.org/10.1029/2019jc015261 cristin:1763490 Copyright 2019. American Geophysical Union. All Rights Reserved. Journal of Geophysical Research (JGR): Oceans VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1029/2019jc015261 2023-03-14T17:42:02Z Data from a late spring survey of the northeast Chukchi Sea are used to investigate various aspects of newly ventilated winter water (NVWW). More than 96% of the water sampled on the shelf was NVWW, the saltiest (densest) of which tended to be in the main flow pathways on the shelf. Nearly all of the hydrographic profiles on the shelf displayed a two‐layer structure, with a surface mixed layer and bottom boundary layer separated by a weak density interface (on the order of 0.02 kg/m3). Using a polynya model to drive a one‐dimensional mixing model, it was demonstrated that, on average, the profiles would become completely homogenized within 14–25 hr when subjected to the March and April heat fluxes. A subset of the profiles would become homogenized when subjected to the May heat fluxes. Since the study domain contained numerous leads within the pack ice—many of them refreezing—and since some of the measured profiles were vertically uniform in density, this suggests that NVWW is formed throughout the Chukchi shelf via convection within small openings in the ice. This is consistent with the result that the salinity signals of the NVWW along the central shelf pathway cannot be explained solely by advection from Bering Strait or via modification within large polynyas. The local convection would be expected to stir nutrients into the water column from the sediments, which explains the high nitrate concentrations observed throughout the shelf. This provides a favorable initial condition for phytoplankton growth on the Chukchi shelf. publishedVersion Article in Journal/Newspaper Bering Strait Chukchi Chukchi Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Bering Strait Chukchi Sea Chukchi Shelf ENVELOPE(-169.167,-169.167,70.550,70.550) Pacific Journal of Geophysical Research: Oceans 124 10 7153 7177 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 Pacini, Astrid Moore, George William Kent Pickart, Robert S. Nobre, Carolina Bahr, Frank Våge, Kjetil Arrigo, Kevin R. Characteristics and Transformation of Pacific Winter Water on the Chukchi Sea Shelf in Late Spring |
topic_facet |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 |
description |
Data from a late spring survey of the northeast Chukchi Sea are used to investigate various aspects of newly ventilated winter water (NVWW). More than 96% of the water sampled on the shelf was NVWW, the saltiest (densest) of which tended to be in the main flow pathways on the shelf. Nearly all of the hydrographic profiles on the shelf displayed a two‐layer structure, with a surface mixed layer and bottom boundary layer separated by a weak density interface (on the order of 0.02 kg/m3). Using a polynya model to drive a one‐dimensional mixing model, it was demonstrated that, on average, the profiles would become completely homogenized within 14–25 hr when subjected to the March and April heat fluxes. A subset of the profiles would become homogenized when subjected to the May heat fluxes. Since the study domain contained numerous leads within the pack ice—many of them refreezing—and since some of the measured profiles were vertically uniform in density, this suggests that NVWW is formed throughout the Chukchi shelf via convection within small openings in the ice. This is consistent with the result that the salinity signals of the NVWW along the central shelf pathway cannot be explained solely by advection from Bering Strait or via modification within large polynyas. The local convection would be expected to stir nutrients into the water column from the sediments, which explains the high nitrate concentrations observed throughout the shelf. This provides a favorable initial condition for phytoplankton growth on the Chukchi shelf. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Pacini, Astrid Moore, George William Kent Pickart, Robert S. Nobre, Carolina Bahr, Frank Våge, Kjetil Arrigo, Kevin R. |
author_facet |
Pacini, Astrid Moore, George William Kent Pickart, Robert S. Nobre, Carolina Bahr, Frank Våge, Kjetil Arrigo, Kevin R. |
author_sort |
Pacini, Astrid |
title |
Characteristics and Transformation of Pacific Winter Water on the Chukchi Sea Shelf in Late Spring |
title_short |
Characteristics and Transformation of Pacific Winter Water on the Chukchi Sea Shelf in Late Spring |
title_full |
Characteristics and Transformation of Pacific Winter Water on the Chukchi Sea Shelf in Late Spring |
title_fullStr |
Characteristics and Transformation of Pacific Winter Water on the Chukchi Sea Shelf in Late Spring |
title_full_unstemmed |
Characteristics and Transformation of Pacific Winter Water on the Chukchi Sea Shelf in Late Spring |
title_sort |
characteristics and transformation of pacific winter water on the chukchi sea shelf in late spring |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/22350 https://doi.org/10.1029/2019jc015261 |
long_lat |
ENVELOPE(-169.167,-169.167,70.550,70.550) |
geographic |
Bering Strait Chukchi Sea Chukchi Shelf Pacific |
geographic_facet |
Bering Strait Chukchi Sea Chukchi Shelf Pacific |
genre |
Bering Strait Chukchi Chukchi Sea |
genre_facet |
Bering Strait Chukchi Chukchi Sea |
op_source |
Journal of Geophysical Research (JGR): Oceans |
op_relation |
Trond Mohn stiftelse: BFS2016REK01 urn:issn:2169-9291 urn:issn:2169-9275 https://hdl.handle.net/1956/22350 https://doi.org/10.1029/2019jc015261 cristin:1763490 |
op_rights |
Copyright 2019. American Geophysical Union. All Rights Reserved. |
op_doi |
https://doi.org/10.1029/2019jc015261 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
10 |
container_start_page |
7153 |
op_container_end_page |
7177 |
_version_ |
1766378564361388032 |