Upper-ocean transport mechanisms from the Gulf of Maine to Georges Bank, with implications for Calanus supply

被引:59
作者
Hannah, CG
Naimie, CE
Loder, JW
Werner, FE
机构
[1] Fisheries & Oceans Canada, Bedford Inst Oceanog, Dartmouth, NS B2Y 4A2, Canada
[2] Dartmouth Coll, Hanover, NH 03755 USA
[3] Univ N Carolina, Marine Sci Program, Chapel Hill, NC 27599 USA
基金
美国国家科学基金会; 美国海洋和大气管理局;
关键词
D O I
10.1016/S0278-4343(97)00048-4
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Potential upper-ocean pathways for the supply of biota from the Gulf of Maine to Georges Bank are investigated by numerically tracking particles in realistic 3-d seasonal-mean and tidal flow fields. The Bow fields, obtained from a prognostic model forced by observed M-2 tides and seasonal-mean wind stress and density fields, include the major known observational features of the circulation regime in winter, spring and summer - a wind-driven surface layer tin winter and early spring) overlying seasonally-evolving baroclinic and tidally-rectified topographic gyres. The surface layer in winter and early spring, with generally southward drift for typical northwesterly wind stress, can act as a conveyor belt for the transport of biota to Georges Bank, provided that the biota can spend a substantial fraction of time in the surface Ekman layer. The numerical experiments indicate that the upper-ocean drift pathways for biota in the southern Gulf of Maine are strongly sensitive to biological and/or physical processes affecting vertical position in relation to the surface Ekman layer and horizontal position in relation to topographic gyres. The seasonality and location of the identified pathways are generally consistent with observed distributional patterns of Calanus finmarchicus based on the Ii-year MARMAP surveys. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1887 / 1911
页数:25
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