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Water temperature and current velocity from RAFOS float KP524

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.398633
Keywords
  • Comment
  • Current Velocity
  • East-West
  • Current Velocity
  • North-South
  • Current Velocity
  • Vertical
  • Floater
  • Indian Ocean
  • Kp524
  • Pressure
  • Maximum
  • Rafos Float
  • Subsurface Float
  • Temperature
  • Water
  • Woce
  • World Ocean Circulation Experiment

Abstract

doi:10.1016/j.dsr2.2004.12.006 Deep-Sea Research II 52 (2 Lagrangian circulation of Antarc subtropical South Atlantic This study combines float data from different projects collected between 1991 and 2003 in the South Atlantic to Deacon (1933) and Wu¨st (1935) first recognized Antarctic Intermediate Water (AAIW) throughout ARTICLE IN PRESS �Corresponding author. Tel.:+49 471 4831 1877; fax: +49471 4831 1797. the South Atlantic by virtue of its mid-depth vertical salinity minimum, building on early 0967-0645/$ - see front matter r 2005 Elsevier Ltd. All rights reserved. doi:10.1016/j.dsr2.2004.12.006 E-mail address: [email protected] (I. Nu´n˜ez-Riboni). describe the flow of Antarctic Intermediate Water (AAIW). Velocity space–time averages are calculated for various grid resolutions and with cells deformed to match the bathymetry, f/H or f/h (with H being the water depth and h being the thickness of the AAIW layer). When judged by the degree of alignment between respective isolines and the resulting average velocity fields, the best grid is based on a nominal cell size of 31 (latitude) by 41 (longitude) with cell shapes deformed according to f/h. Using this grid, objectively estimated mean currents (and their associated errors), as well as meridional and zonal volume transports are estimated. Results show an anticyclonic Subtropical Gyre centred near 361S and spanning from 23711S to 46711S. The South Atlantic Current meanders from 331S to 461S and shows a mean speed of 9.677.8 cm s�1 (8.573.5 Sv; 1 Sv ¼ 1� 106m3 s�1). The northern branch of the Subtropical Gyre is located between 221S and 321S and flows westward with a mean speed of 4.773.3 cm s�1 (9.373.4 Sv). Evidence of a cyclonic Tropical Gyre divided in two sub-cells is visible on the stream function. r 2005 Elsevier Ltd. All rights reserved. 1. Introduction During the late 1920s of the last century, Ismael Nu´n˜ez-Ribonia,�, Olaf Boebela, Michel Ollitraultb, Yuzhu Youc, Philip L. Richardsond, Ru

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