The circulation and water masses in the Gulf of the Farallones
Six ADCP and CTD ship surveys of the continental shelf and slope in the vicinity of the Gulf of the Farallones, CA, were conducted in 1990}1992. ADCP data provide much more detail on the structure of the currents over the slope and shelf in the Gulf and reveal a persistent, largely barotropic polewa...
Main Authors: | , , , , , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2000
|
Subjects: | |
Online Access: | https://hdl.handle.net/10945/43252 |
id |
ftnavalpschool:oai:calhoun.nps.edu:10945/43252 |
---|---|
record_format |
openpolar |
spelling |
ftnavalpschool:oai:calhoun.nps.edu:10945/43252 2024-06-09T07:49:51+00:00 The circulation and water masses in the Gulf of the Farallones Steger, John M. Schwing, Franklin B. Collins, Curtis A. Rosenfeld, Leslie K. Garfield, Newell Gezgin, Erhan Oceanography 2000 application/pdf https://hdl.handle.net/10945/43252 unknown Deep-Sea Research II, Volume 47, (2000), pp. 907-946 https://hdl.handle.net/10945/43252 This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. Article 2000 ftnavalpschool 2024-05-15T00:24:02Z Six ADCP and CTD ship surveys of the continental shelf and slope in the vicinity of the Gulf of the Farallones, CA, were conducted in 1990}1992. ADCP data provide much more detail on the structure of the currents over the slope and shelf in the Gulf and reveal a persistent, largely barotropic poleward #ow with a complex mesoscale #ow "eld superimposed. The directly measured currents are not well represented by the geostrophic velocity "elds derived from hydrographic casts. Important upper-ocean circulation features include: a Slope Countercurrent (SCC), variable shelf circulation, and submesoscale eddy-like features. The SCC was present in all seasons and is believed due to a strong year-round positive wind-stress curl enhanced by Point Reyes. Its #ow was poleward throughout the upper 300 m, and often surface intensi"ed. Poleward transport in the upper 400 m was 1}3 Sv, much greater than previous geostrophic estimates for the California Current System constrained to a 500 dbar reference level. The shelf circulation was much more variable than the SCC and generally exhibited a pattern consistent with classic Ekman dynamics, responding to synoptic wind forcing. Submesoscale vortices, or eddies, often dominated the general #ow "eld. These eddies are thought to be generated by the frictional torque associated with current}topography interactions. Their centers typically have a distinct water type associated with either the SCC or the southward-#owing California Current. Higher spiciness anomalies, representing a higher percentage of Paci"c Equatorial Water (PEW), were typically found in the core of the SCC or within anticyclonic eddies. Lower (bland) spiciness anomalies, characteristic of a higher percentage of Paci"c Subarctic Water (PSAW), were associated with cyclonic eddies. While these circulation features were largely barotropic, the #ow also adjusted baroclinically to changes in the density "eld, as di!erent water types were advected by the general #ow "eld or by mesoscale instabilities in the large-scale ... Article in Journal/Newspaper Subarctic Naval Postgraduate School: Calhoun Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Pew ENVELOPE(169.183,169.183,-72.317,-72.317) |
institution |
Open Polar |
collection |
Naval Postgraduate School: Calhoun |
op_collection_id |
ftnavalpschool |
language |
unknown |
description |
Six ADCP and CTD ship surveys of the continental shelf and slope in the vicinity of the Gulf of the Farallones, CA, were conducted in 1990}1992. ADCP data provide much more detail on the structure of the currents over the slope and shelf in the Gulf and reveal a persistent, largely barotropic poleward #ow with a complex mesoscale #ow "eld superimposed. The directly measured currents are not well represented by the geostrophic velocity "elds derived from hydrographic casts. Important upper-ocean circulation features include: a Slope Countercurrent (SCC), variable shelf circulation, and submesoscale eddy-like features. The SCC was present in all seasons and is believed due to a strong year-round positive wind-stress curl enhanced by Point Reyes. Its #ow was poleward throughout the upper 300 m, and often surface intensi"ed. Poleward transport in the upper 400 m was 1}3 Sv, much greater than previous geostrophic estimates for the California Current System constrained to a 500 dbar reference level. The shelf circulation was much more variable than the SCC and generally exhibited a pattern consistent with classic Ekman dynamics, responding to synoptic wind forcing. Submesoscale vortices, or eddies, often dominated the general #ow "eld. These eddies are thought to be generated by the frictional torque associated with current}topography interactions. Their centers typically have a distinct water type associated with either the SCC or the southward-#owing California Current. Higher spiciness anomalies, representing a higher percentage of Paci"c Equatorial Water (PEW), were typically found in the core of the SCC or within anticyclonic eddies. Lower (bland) spiciness anomalies, characteristic of a higher percentage of Paci"c Subarctic Water (PSAW), were associated with cyclonic eddies. While these circulation features were largely barotropic, the #ow also adjusted baroclinically to changes in the density "eld, as di!erent water types were advected by the general #ow "eld or by mesoscale instabilities in the large-scale ... |
author2 |
Oceanography |
format |
Article in Journal/Newspaper |
author |
Steger, John M. Schwing, Franklin B. Collins, Curtis A. Rosenfeld, Leslie K. Garfield, Newell Gezgin, Erhan |
spellingShingle |
Steger, John M. Schwing, Franklin B. Collins, Curtis A. Rosenfeld, Leslie K. Garfield, Newell Gezgin, Erhan The circulation and water masses in the Gulf of the Farallones |
author_facet |
Steger, John M. Schwing, Franklin B. Collins, Curtis A. Rosenfeld, Leslie K. Garfield, Newell Gezgin, Erhan |
author_sort |
Steger, John M. |
title |
The circulation and water masses in the Gulf of the Farallones |
title_short |
The circulation and water masses in the Gulf of the Farallones |
title_full |
The circulation and water masses in the Gulf of the Farallones |
title_fullStr |
The circulation and water masses in the Gulf of the Farallones |
title_full_unstemmed |
The circulation and water masses in the Gulf of the Farallones |
title_sort |
circulation and water masses in the gulf of the farallones |
publishDate |
2000 |
url |
https://hdl.handle.net/10945/43252 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) ENVELOPE(169.183,169.183,-72.317,-72.317) |
geographic |
Curl Pew |
geographic_facet |
Curl Pew |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
Deep-Sea Research II, Volume 47, (2000), pp. 907-946 https://hdl.handle.net/10945/43252 |
op_rights |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
_version_ |
1801382724675567616 |