Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/15364
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

Northward Penetration of Antarctic Intermediate Water off Northwest Africa

AuthorsMachín, Francisco CSIC ORCID; Pelegrí, Josep Lluís CSIC ORCID
Issue DateMar-2009
PublisherAmerican Meteorological Society
CitationJournal of Physical Oceanography 39(3): 512-535 (2009)
AbstractIn this article, historical and climatological datasets are used to investigate the seasonal northward propagation of Antarctic Intermediate Waters (AAIW) along the eastern margin of the North Atlantic subtropical gyre. A cluster analysis for data north of 26°N shows the presence of a substantial number of hydrographic stations with AAIW characteristics that stretch northeast along the African slope. This water mass extends north during fall, as shown both through the comparison of actual and climatological data, and by applying a mixing analysis to normal-to-shore seasonal sections at both 28.5° and 32°N. The mixing analysis is further used with several fall cruises between 32° and 36°N, and shows that at these latitudes the core of AAIW propagates along the 27.5 isoneutral with contributions that reach as much as 50% at 32.5°N. An idealized Sverdrup-type model is used in combination with climatological hydrographic and wind data to examine what forces this eastern boundary propagation. It is found that column stretching, initiated in the tropical North Atlantic, is the dominant term in the vorticity balance of the AAIW stratum, capable of sustaining a winter–spring–summer northward transport of about 3–4 Sv (1 Sv ≡ 10^6 m3 s−1) that reaches as far north as the Canary Archipelago (28°N). In fall, this transport may continue beyond 28°N, sustained by a near-slope meridional stretching of this water stratum. AAIW probably fades away in the northeastern region as the result of several processes, specially enhanced double diffusion with surrounding waters and interaction with Mediterranean water lenses
Description24 pages, 20 figures, 1 tables
Publisher version (URL)https://doi.org/10.1175/2008JPO3825.1
URIhttp://hdl.handle.net/10261/15364
DOI10.1175/2008JPO3825.1
ISSN0022-3670
Appears in Collections:(ICM) Artículos

Files in This Item:
File Description SizeFormat
Machin_et_al_2009.pdf3,14 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work

SCOPUSTM   
Citations

42
checked on May 11, 2022

WEB OF SCIENCETM
Citations

42
checked on May 9, 2022

Page view(s)

395
checked on May 17, 2022

Download(s)

211
checked on May 17, 2022

Google ScholarTM

Check

Altmetric

Dimensions


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.