Role of Gulf Stream frontal eddies in forming phytoplankton patches on the outer southeastern shelf1
Role of Gulf Stream frontal eddies in forming phytoplankton patches on the outer southeastern shelf1
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墨西哥湾流锋面涡旋在东南外陆架浮游植物斑块形成中的作用1
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
C. McClain
中科院分区：
文献类型：
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作者：
J. Yoder;L. Atkinson;Thomas N. Lee;Hongsuk H. Kim;C. McClain
对墨西哥湾流气旋锋面300公里处的温度、盐度和叶绿素进行了连续的表面测绘，确定了持续了10天的大型硅藻区域的空间尺度。这块区域位于1979年4月佛罗里达州杰克逊维尔附近200米等深线中心的墨西哥湾流锋面涡旋上升的冷核中。2×××/表层叶绿素等值线，圈定在1000公里/×××10×10~(-1)×××~(-1)/表层叶绿素等值线上，近岸面积130公里。在涡旋上升的冷核内，表层叶绿素超过5微升/升/超-1，比墨西哥湾流或居民陆架表层水中的浓度高10-100倍。硅藻以观测到的最大丰度占优势>；10/sup 6/cell s.liter/sup-1/。在最初的船上测绘几天后，由NASA U-2飞机上搭载的海洋颜色扫描仪(OCS)生成的表面叶绿素图像证实了该斑块的大小、位置和强烈的叶绿素梯度。我们表明，与沿墨西哥湾流气旋锋面形成的涡旋相关的上升流导致了位于墨西哥湾流低营养表层水域附近的高表层生产力和植物生物量的局部区域。
Continuous surface mapping of temperature, salinity, and chlorophyll along a 300-km segment of the Gulf Stream cyclonic front defined the spatial scales of a large diatom patch that persisted throughout a 10-day study. The patch was localized in the upwelled cold core of a Gulf Stream frontal eddy centered over the 200-m isobath off Jacksonville, Florida, in April 1979. The 2 ..mu..g.liter/sup -1/ surface chlorophyll isopleth enclosed in area >1,000 km/sup 2/ with an alongshore dimension of 130 km. Surface chlorophyll exceeded 5 ..mu..g.liter/sup -1/ within the upwelled cold core of the eddy, 10-100x higher than concentrations in Gulf Stream or resident shelf surface water. Diatoms dominated the patch with the maximum observed abundance >10/sup 6/ cells.liter/sup -1/. Several days after the initial shipboard mapping, the size, location, and strong chlorophyll gradients of the patch were confirmed with a surface chlorophyll image generated from an ocean color scanner (OCS) flown aboard a NASA U-2 aircraft. We show that the upwelling associated with eddies forming along the Gulf Stream cyclonic front results in localized zones of high near-surface production and plant biomass that lie adjacent to oligotrophic surface waters of the Gulf Stream.