A strong biological response to oceanic flow past Cobb Seamount

Deep-sea research. Part A, Oceanographic research papers Pub Date : 1992-07-01 DOI:10.1016/0198-0149(92)90061-W

John Dower , Howard Freeland , Kim Juniper

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引用次数: 128

Abstract

We report results of a CTD and chlorphyll $a$ survey from Cobb Seamount, a shallow seamount in the northeast Pacific. Our results show a several-fold increasein the standing crop of chlorophyll $a$ is centred over the seamount. Current meter and drifter data indicate an anticyclonic deflection of deep currents around consistent with a theoretical stratified Tylor cone. Cobb differs from other seamounts where similar phenomena have been reported (Owens and Hogg; 1980, Deep-Sea Research, 27, 1029–1045; Gouldet al., 1981, Deep-Sea Research, 28, 409–440; Genin and Boehlert, 1985, Journal of Marine Research, 43, 907–924) in that its summit penetrates well into the euphotic zone. A Taylor column existing at such shallow depths could locally enhance primary production, providing a significant source of energy for higher trophic levels on the seamount. Indirect evidence for such a scenario comes from observations of a high biomass benthic community on Cobb Seamount.

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对经过科布海山的洋流的强烈生物反应

我们报告了东北太平洋科布海山的CTD和叶绿素a调查结果。我们的研究结果表明，叶绿素a的现存量增加了数倍，集中在海山上。海流计和漂流器的数据表明，深部洋流的反气旋偏转与理论分层泰勒锥一致。Cobb与其他曾报道过类似现象的海山不同（Owens和Hogg；1980年，深海研究，271029-1045；Gouldet等人，1981年，深海调查，28409-440；Genin和Boehlert，1985年，《海洋研究杂志》，43007-924），因为它的顶峰能很好地穿透透光带。在如此浅的深度存在的泰勒柱可以局部提高初级生产力，为海山上更高的营养水平提供重要的能源。这种情况的间接证据来自对科布海山上高生物量底栖生物群落的观察。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Deep-sea research. Part A, Oceanographic research papers

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