Physical controls and interannual variability of the Labrador Sea spring phytoplankton bloom in distinct regions
Physical controls and interannual variability of the Labrador Sea spring phytoplankton bloom in distinct regions
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DOI：
10.1016/j.dsr.2010.01.003
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发表时间：
2010-04-01
影响因子：
2.4
通讯作者：
Rhines, Peter B.
中科院分区：
文献类型：
--
作者：
Frajka-Williams, Eleanor;Rhines, Peter B.
我们调查了拉布拉多海春季浮游植物水华的变化，划分为不同的地理区域，然后分析了水华和物理强迫之间的关系。根据SeaWiFS卫星海洋叶绿素1998-2008年的11年记录，拉布拉多海北部春季浮游植物水华的强度变化为4倍，开始时间变化为3周。北部的水华（北纬60度以北和拉布拉多大陆架以西）最早也最强烈，部分原因是西格陵兰海流的离岸淡水分层。在年际时间尺度上。北部水华强度与近海平流、涡旋活动和格陵兰径流等海洋过程存在显著相关性，而拉布拉多海中部的水华发生时间较晚，且较弱，仅与辐射强度存在相关性。随着副极地环流强度和形状的变化，我们可以预期生物反应的进一步变化，如这些关系所示。
We investigated the variability of the spring phytoplankton bloom in the Labrador Sea, dividing into distinct biogeographical zones, then analyzing the relationship between the bloom and physical forcings. The spring phytoplankton bloom in the north Labrador Sea varied in intensity by a factor of 4 and in timing of onset by 3 weeks over the 11-year record from SeaWiFS satellite ocean chlorophyll, 1998-2008. This north bloom (north of 60 degrees N and west of the Labrador shelves) is earliest and most intense, owing in part to the offshore-directed freshwater stratification from the West Greenland Current. On interannual timescales. significant correlations were found between the north bloom intensity and ocean processes, namely offshore advection, eddy activity and runoff from Greenland In contrast, the central Labrador Sea is later and weaker, and only a correlation between the bloom timing and irradiance was found As the subpolar gyre shifts in strength and shape, freshwater outflow from the Arctic and Greenland changes, we may expect further changes in the biological response as indicated by these relationships Crown Copyright (C) 2010 Published by Elsevier Ltd All rights reserved.