Summer and winter surveys of the Subtropical Front of the southeastern Indian Ocean 1997-1998

被引:26
作者
James, C
Tomczak, M
Helmond, I
Pender, L
机构
[1] Flinders Univ S Australia, Flinders Inst Atmospher & Marine Sci, Adelaide, SA 5001, Australia
[2] CSIRO, Div Marine Res, Hobart, Tas 7001, Australia
关键词
Subtropical Front; summer; winter; density compensation; SeaSoar; Australia; 119-147 degrees E; 36-45 degrees S;
D O I
10.1016/S0924-7963(02)00199-9
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Subtropical Front (STF) in the region south of Australia was surveyed to determine its location, character, and seasonal variation. The survey consisted of two cruises, during summer and winter of 1998, and used a towed CTD system (SeaSoar). Based on observations, the STF does not appear to be continuous between the Indian and Pacific Oceans in the region south of Tasmania during winter; instead, it appears to end at the continental shelf of western Bass Strait near 40degreesS. During both seasons, the STF is characterized by moderate to strong density compensation with the horizontal density ratio (R-p = alphaDeltaAT/betaDeltaS) close to 1 both in and below the mixed layer. This contrasts with observations in other regions where RP tends towards 2 below the mixed layer. We observed a high degree of interleaving, submerged eddies and small scale temperature and salinity variability. This is attributed to the interaction of a front that is density compensated with a local wind field that periodically reverses direction. Crown Copyright (C) 2002 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:129 / 149
页数:21
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