Forced resonant undulation in the deep Mascarene Basin

被引:29
作者
Warren, BA
Whitworth, T
LaCasce, JH
机构
[1] Woods Hole Oceanog Inst, Phys Oceanog Dept, Woods Hole, MA 02543 USA
[2] Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0967-0645(01)00151-5
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Current meters moored for 19.5 months at Lat. 20degreesS in the deep water of the western Mascarene Basin recorded a distinct, large-amplitude [0(10 cm s(-1))] undulation of bimonthly period, propagating westward at 7 cm s(-1). its characteristics demonstrate that it was a barotropic Rossby wave of relatively large meridional scale. Simple theory accounts for it as having been forced by local wind-stress curl at one of the resonant frequencies of the Mascarene Basin. A sharp bimonthly peak is also prominent in spectra of TOPEX/POSEIDON sea-surface height in the Mascarene Basin, but is not seen to the eastward, as is consistent with the local generation. Fluctuations of 45-day period reported earlier in the upper ocean just northeast of Madagascar might have been generated through a similar process, but with frequency shifted by the South Equatorial Current. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1513 / 1526
页数:14
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