Study of tracer distribution in the Drake Passage
Entry ID: CNDA-ESP_ANT95-1718-E

[ Update this Record ]

Summary
Abstract: In English:
R/V Hesperides occupied the World Ocean Circulation Experiment SR1b repeat
section across the Scotia Sea in February 1995, February 1996, and February
1998. On each cruise the same set of 21 hydrographic stations with
characteristic spacing <20 nautical miles was visited. The results of the three
surveys display a characteristic zonation of water masses in the region, which
is defined by four hydrographic fronts. The net geostrophic transport of the
Antarctic Circumpolar Current (ACC) across SR1b, computed with reference to the
deepest common depth of each pair of adjacent stations, is similar in all three
cruises, 144 Sv in February 1995, 131 Sv in February 1996, and 134 Sv in
February 1998, and compares well with earlier computations of the ACC transport
across Drake Passage. A close comparison of the vertical distributions of water
properties on SR1b reveals changes in the structure of the ACC that are linked
to undersampled current mesoscale activity, as suggested by infrared satellite
images contemporary to the cruises. The most remarkable features are several
hydrographic discontinuities observed in the Antarctic Zone south of the
Southern ACC Front (SACCF), which are believed to be signatures of eddies
produced east of the Shackleton Fracture Zone. The paper further addresses the
different contribution of each ACC zonal band to the net geostrophic transport
across SR1b on each Hesperides occupation.

Related URL
Link: VIEW RELATED INFORMATION
Description: Observed variability of water properties and transports on the World Ocean
Circulation Experiment SR1b section across the Antarctic Circumpolar Current,
Journal of Geophysical Research (Article can be accessed on-line through AGU)


Geographic Coverage
 N: -54.0 S: -62.0  E: -41.0  W: -58.0

Temporal Coverage
Start Date: 1998-01-13
Stop Date: 1998-02-18


Location Keywords
CONTINENT > ANTARCTICA > ANTARCTIC PENINSULA
CONTINENT > ANTARCTICA > SCOTIA SEA
CONTINENT > ANTARCTICA > DRAKE PASSAGE
CONTINENT > ANTARCTICA > ANTARCTIC CIRCUMPOLAR CURRENT (ACC)
GEOGRAPHIC REGION > POLAR


Science Keywords
OCEANS >OCEAN CHEMISTRY >NITRATE    [Definition]
OCEANS >OCEAN CHEMISTRY >NITRITE    [Definition]
OCEANS >OCEAN CHEMISTRY >NUTRIENTS    [Definition]
OCEANS >OCEAN CHEMISTRY >OCEAN TRACERS    [Definition]
OCEANS >OCEAN CHEMISTRY >OXYGEN    [Definition]
OCEANS >OCEAN CHEMISTRY >PIGMENTS    [Definition]
OCEANS >OCEAN CHEMISTRY >SILICATE    [Definition]
OCEANS >OCEAN CIRCULATION >EDDIES    [Definition]
OCEANS >OCEAN CIRCULATION >OCEAN CURRENTS >SVERDRUP TRANSPORT    [Definition]
OCEANS >OCEAN CIRCULATION >WATER MASSES    [Definition]
OCEANS >OCEAN CHEMISTRY >PIGMENTS >CHLOROPHYLL    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION
OCEANS


Platform
SHIPS    [Information]


Instrument
CTD >Conductivity, Temperature, Depth    [Information]
NISKIN BOTTLES    [Information]
AUTOANALYZER    [Information]
PHOTOMETERS    [Information]
FLUOROMETERS    [Information]


Project
WOCE >World Ocean Circulation Experiment    [Information]


Keywords
ANTARCTIC CIRCUMPOLAR CURRENT
NUTRIENTS
TRACER
WOCE
PHYTOPLANKTON
WATER MASSES


Originating Center
Centro de Estudios Avanzados de Blanes (CEAB)


Data Center
Centro Nacional de Datos Antarticos, National Antarctic Data Centre, Comite Polar Espanol, Spain    [Information]
Data Center URL: http://hielo.igme.es/

Data Center Personnel
Name: ANTONIO BARRAGAN SANABRIA
Phone: +34913495731
Fax: +34913495929
Email: a.barragan at igme.es
Contact Address:
Centro Nacional de Datos Antarticos
Instituto Geologico y Minero de Espana
c/Rios Rosas 23
City: Madrid
Postal Code: 28003
Country: SPAIN



Distribution
Distribution_Media: CD-ROM;DAT
Distribution_Format: ASCII;BINARY


Personnel
ANTONIO CRUZADO ALORDA
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +34972336101
Fax: +34972337806
Email: cruzado at ceab.csic.es
Contact Address:
Centro de Estudios Avanzados de Blanes (CEAB)
c/Acces a la Cala St. Francesc, 14
City: BLANES
Province or State: GERONA
Postal Code: 17300
Country: SPAIN


OSCAR BERMUDEZ MOLINA
Role: DIF AUTHOR
Phone: +34913495889
Fax: +34913495929
Email: o.bermudez at igme.es
Contact Address:
Centro Nacional de Datos Antarticos
Instituto Geologico y Minero de Espana
C/ Rios Rosas 23
City: Madrid
Postal Code: E-28003
Country: SPAIN



Creation and Review Dates
DIF Creation Date: 2005-05-17
Last DIF Revision Date: 2005-05-17

[ Update this Record ]


Link to Web Site