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Titre du Document
An investigation of the dynamics of the East Greenland Current in Fram Strait based on a simple analytical model
Auteur(s)
SCHLICHTHOLZ P. ; HOUSSAIS M.-N.
Résumé
The East Greenland Current (EGC) in Fram Strait is examined in summer, based on the hydrographic data from the MIZEX 84 experiment, and its dynamics is further analyzed using a simple analytical model. From the observed density field, the southward geostrophic transport relative to the bottom in the EGC is estimated to be about 4 Sv (Sv ≡ 106 m3 s-1) at 78.4°N, which, assuming a ratio 1:1 between the bottom and the relative transports as suggested in the literature, allows one to postulate a 4 Sv bottom transport. The hydrographic data also reveal a northward gradient of potential energy along the East Greenland slope, between 77.5°N and 80.5°N. Such a gradient is the prerequisite for the existence of the joint effect of baroclinicity and relief (JEBAR), which is here proposed as a driving mechanism for the bottom transport in the EGC. A model with idealized topography and a density distribution prescribed from the above data is constructed based on a steady-state vorticity equation in which the JEBAR forcing is balanced by damping due to friction. According to the model, the JEBAR-induced flow consistent with such a gradient is southward. Validity requirements on the model assumptions constrain the range of allowable values for the model friction parameters. The prediction of a 4 Sv bottom transport can be obtained for a total amount of friction within this range. Both internal and bottom friction are considered in the model. The relative importance of
Editeur
American Meteorological Society
Identifiant
ISSN : 0022-3670 CODEN : JPYOBT
Source
Journal of physical oceanography A. 1999, vol. 29, n° 9, pp. 2240-2265 [bibl. : 35 ref.]
Langue
Anglais
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