The role of air-sea fluxes in Subantarctic Mode Water formation

dc.contributor.author Holte, James W.
dc.contributor.author Talley, Lynne D.
dc.contributor.author Chereskin, Teresa K.
dc.contributor.author Sloyan, Bernadette M.
dc.date.accessioned 2012-05-03T15:33:27Z
dc.date.available 2014-10-22T08:57:25Z
dc.date.issued 2012-03-29
dc.description Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 117 (2012): C03040, doi:10.1029/2011JC007798. en_US
dc.description.abstract Two hydrographic surveys and a one-dimensional mixed layer model are used to assess the role of air-sea fluxes in forming deep Subantarctic Mode Water (SAMW) mixed layers in the southeast Pacific Ocean. Forty-two SAMW mixed layers deeper than 400 m were observed north of the Subantarctic Front during the 2005 winter cruise, with the deepest mixed layers reaching 550 m. The densest, coldest, and freshest mixed layers were found in the cruise's eastern sections near 77°W. The deep SAMW mixed layers were observed concurrently with surface ocean heat loss of approximately −200 W m−2. The heat, momentum, and precipitation flux fields of five flux products are used to force a one-dimensional KPP mixed layer model initialized with profiles from the 2006 summer cruise. The simulated winter mixed layers generated by all of the forcing products resemble Argo observations of SAMW; this agreement also validates the flux products. Mixing driven by buoyancy loss and wind forcing is strong enough to deepen the SAMW layers. Wind-driven mixing is central to SAMW formation, as model runs forced with buoyancy forcing alone produce shallow mixed layers. Air-sea fluxes indirectly influence winter SAMW properties by controlling how deeply the profiles mix. The stratification and heat content of the initial profiles determine the properties of the SAMW and the likelihood of deep mixing. Summer profiles from just upstream of Drake Passage have less heat stored between 100 and 600 m than upstream profiles, and so, with sufficiently strong winter forcing, form a cold, dense variety of SAMW. en_US
dc.description.embargo 2012-09-29
dc.description.sponsorship NSF Ocean Sciences grant OCE-0327544 supported LDT, TKC, and JH and funded the two research cruises. BMS’s contribution to this work was undertaken as part of the Australian Climate Change Science Program, funded jointly by the Department of Climate Change and Energy Efficiency and CSIRO. The QuikSCAT wind mapping method [Kelly et al., 1999], used to create the Kelly flux product, was sponsored by NASA’s Ocean Vector Winds Science. NCEP Reanalysis data were provided by the NOAA/OAR/ESRL PSD. WHOI’s OAFlux project is funded by the NOAA Climate Observations and Monitoring (COM) program. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research 117 (2012): C03040 en_US
dc.identifier.doi 10.1029/2011JC007798
dc.identifier.uri https://hdl.handle.net/1912/5156
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri https://doi.org/10.1029/2011JC007798
dc.subject ACC en_US
dc.subject Subantarctic Mode Water en_US
dc.subject Mixed layers en_US
dc.subject Mode water en_US
dc.title The role of air-sea fluxes in Subantarctic Mode Water formation en_US
dc.type Article en_US
dspace.entity.type Publication
relation.isAuthorOfPublication d3ffa7ad-e320-4749-9865-3569d315efde
relation.isAuthorOfPublication 6cf0963b-18f3-4725-98a2-c80050ab8c3b
relation.isAuthorOfPublication bfeedd67-d865-4185-a7f8-a4414c097429
relation.isAuthorOfPublication 1e74fefe-ee29-4f8e-a62d-9ab730136b19
relation.isAuthorOfPublication.latestForDiscovery d3ffa7ad-e320-4749-9865-3569d315efde
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
2011JC007798.pdf
Size:
2.95 MB
Format:
Adobe Portable Document Format
Description:
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.89 KB
Format:
Item-specific license agreed upon to submission
Description: