Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice
We present observational estimates of Ekman pumping in the Beaufort Gyre region. Averaged over the Canada Basin, the results show a 2003-14 average of 2.3myr⁻¹ downward with strong seasonal and interannual variability superimposed: monthly and yearly means range from 30myrsu downward to 10myr⁻¹ upwa...
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ftmit:oai:dspace.mit.edu:1721.1/118476 2023-06-11T04:08:44+02:00 Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice Timmermans, Mary-Louise Meneghello, Gianluca Marshall, John C Scott, Jeffery R. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Meneghello, Gianluca Marshall, John C Scott, Jeffery R. 2018-09-26T17:52:17Z application/pdf http://hdl.handle.net/1721.1/118476 unknown American Meteorological Society http://dx.doi.org/10.1175/JPO-D-17-0188.1 Journal of Physical Oceanography 0022-3670 1520-0485 http://hdl.handle.net/1721.1/118476 Meneghello, Gianluca et al. “Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice.” Journal of Physical Oceanography 48, 4 (April 2018): 795–805 © 2018 American Meteorological Society orcid:0000-0001-9230-3591 Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Meteorological Society Article http://purl.org/eprint/type/JournalArticle 2018 ftmit https://doi.org/10.1175/JPO-D-17-0188.1 2023-05-29T08:15:24Z We present observational estimates of Ekman pumping in the Beaufort Gyre region. Averaged over the Canada Basin, the results show a 2003-14 average of 2.3myr⁻¹ downward with strong seasonal and interannual variability superimposed: monthly and yearly means range from 30myrsu downward to 10myr⁻¹ upward. A clear, seasonal cycle is evident with intense downwelling in autumn and upwelling during the winter months, despite the wind forcing being downwelling favorable year-round. Wintertime upwelling is associated with friction between the large-scale Beaufort Gyre ocean circulation and the surface ice pack and contrasts with previous estimates of yearlong downwelling; as a consequence, the yearly cumulative Ekman pumping over the gyre is significantly reduced. The spatial distribution of Ekman pumping is also modified, with the Beaufort Gyre region showing alternating, moderate upwelling and downwelling, while a more intense, yearlong downwelling averaging 18myr⁻¹ is identified in the northern Chukchi Sea region. Implications of the results for understanding Arctic Ocean dynamics and change are discussed. Keywords: Ocean; Arctic; Arctic Oscillation; Atmosphere-ocean interaction; Ekman pumping/transport; Upwelling/downwelling Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea canada basin Chukchi Chukchi Sea ice pack Sea ice DSpace@MIT (Massachusetts Institute of Technology) Arctic Arctic Ocean Chukchi Sea Canada Journal of Physical Oceanography 48 4 795 805 |
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Open Polar |
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DSpace@MIT (Massachusetts Institute of Technology) |
op_collection_id |
ftmit |
language |
unknown |
description |
We present observational estimates of Ekman pumping in the Beaufort Gyre region. Averaged over the Canada Basin, the results show a 2003-14 average of 2.3myr⁻¹ downward with strong seasonal and interannual variability superimposed: monthly and yearly means range from 30myrsu downward to 10myr⁻¹ upward. A clear, seasonal cycle is evident with intense downwelling in autumn and upwelling during the winter months, despite the wind forcing being downwelling favorable year-round. Wintertime upwelling is associated with friction between the large-scale Beaufort Gyre ocean circulation and the surface ice pack and contrasts with previous estimates of yearlong downwelling; as a consequence, the yearly cumulative Ekman pumping over the gyre is significantly reduced. The spatial distribution of Ekman pumping is also modified, with the Beaufort Gyre region showing alternating, moderate upwelling and downwelling, while a more intense, yearlong downwelling averaging 18myr⁻¹ is identified in the northern Chukchi Sea region. Implications of the results for understanding Arctic Ocean dynamics and change are discussed. Keywords: Ocean; Arctic; Arctic Oscillation; Atmosphere-ocean interaction; Ekman pumping/transport; Upwelling/downwelling |
author2 |
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Meneghello, Gianluca Marshall, John C Scott, Jeffery R. |
format |
Article in Journal/Newspaper |
author |
Timmermans, Mary-Louise Meneghello, Gianluca Marshall, John C Scott, Jeffery R. |
spellingShingle |
Timmermans, Mary-Louise Meneghello, Gianluca Marshall, John C Scott, Jeffery R. Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice |
author_facet |
Timmermans, Mary-Louise Meneghello, Gianluca Marshall, John C Scott, Jeffery R. |
author_sort |
Timmermans, Mary-Louise |
title |
Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice |
title_short |
Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice |
title_full |
Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice |
title_fullStr |
Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice |
title_full_unstemmed |
Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice |
title_sort |
observations of seasonal upwelling and downwelling in the beaufort sea mediated by sea ice |
publisher |
American Meteorological Society |
publishDate |
2018 |
url |
http://hdl.handle.net/1721.1/118476 |
geographic |
Arctic Arctic Ocean Chukchi Sea Canada |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea Canada |
genre |
Arctic Arctic Ocean Beaufort Sea canada basin Chukchi Chukchi Sea ice pack Sea ice |
genre_facet |
Arctic Arctic Ocean Beaufort Sea canada basin Chukchi Chukchi Sea ice pack Sea ice |
op_source |
American Meteorological Society |
op_relation |
http://dx.doi.org/10.1175/JPO-D-17-0188.1 Journal of Physical Oceanography 0022-3670 1520-0485 http://hdl.handle.net/1721.1/118476 Meneghello, Gianluca et al. “Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice.” Journal of Physical Oceanography 48, 4 (April 2018): 795–805 © 2018 American Meteorological Society orcid:0000-0001-9230-3591 |
op_rights |
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. |
op_doi |
https://doi.org/10.1175/JPO-D-17-0188.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
48 |
container_issue |
4 |
container_start_page |
795 |
op_container_end_page |
805 |
_version_ |
1768382219398676480 |