Wintertime observations of Subtropical Mode Water formation within the Gulf Stream
Figure S1: Upstream and downstream structure of the Gulf Stream in the winter of 2007 when the CLIMODE data were collected. (2.046Mb)
Figure S3: Structure of the % oxygen saturation, fluorescence, potential density, and absolute momentum. (1.310Mb)
MetadataShow full item record
We study the structure of Subtropical Mode Water (STMW) within the eastward-flowing Gulf Stream as it forms during strong winter cooling. Shipboard observations using SeaSoar and ADCP reveal that while active mixing by gravitational instabilities is common, large vertical and lateral shears of the Gulf Stream play a central role in determination of the modes of active mixing. Evidence is presented that low static stability and large vertical shear can combine to cause slantwise convection/symmetric instabilities, while the large anticyclonic shears to the south of the Gulf Stream core can cause low absolute vorticity and precondition the Ertel potential vorticity to be small and more susceptible to instabilities. The area of active mixing driven by surface forcing in the presences of shear occupies a swath 50–90 km wide immediately south of the Gulf Stream core at the northern edge of the Sargasso Sea.
Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 36 (2009): L02607, doi:10.1029/2008GL035918.
Showing items related by title, author, creator and subject.
On the connection between dense water formation, overturning, and poleward heat transport in a convective basin Straneo, Fiamma (American Meteorological Society, 2006-09)An isopycnal, two-layer, idealized model for a convective basin is proposed, consisting of a convecting, interior region and a surrounding boundary current (buoyancy and wind-driven). Parameterized eddy fluxes govern the ...
Evaporative dense water formation and cross-shelf exchange over the northwest Australian inner shelf Shearman, R. Kipp; Brink, Kenneth H. (American Geophysical Union, 2010-06-29)High-resolution surveys of oceanographic and atmospheric conditions made during the winter over the inner shelf off northwest Australia are used to examine the coastal ocean response to large outgoing heat and freshwater ...
Joyce, Terrence M. (2011-04-08)In this report, Eighteen Degree Water (EDW) formation will be discussed, with emphasis on advances in understanding emerging within the past decade. In particular, a recently completed field study of EDW (CLIMODE) is ...