Production regimes in four Eastern Boundary Current systems
Production regimes in four Eastern Boundary Current systems
复制标题
DOI：
10.1016/j.dsr2.2003.07.015
复制
发表时间：
2003-01-01
影响因子：
3
通讯作者：
Kearns, EJ
中科院分区：
文献类型：
--
作者：
Carr, ME;Kearns, EJ
东边界流(EBCs)的高生产力(最大值类似于3g Cm(-2)天(-1))，即加利福尼亚、秘鲁-洪堡、加那利和本格拉流，是由当地强迫和大尺度环流共同驱动的。上升风带来的深水特征取决于大尺度环流模式。在这里，我们使用一种新的水文和营养气候学，以及对风矢量、海表面温度(SST)、叶绿素浓度和初级生产力的卫星测量，根据海洋颜色模拟来量化上升流动力学和生物响应的经向和季节模式。史无前例的数据集组合使我们能够客观地描述每个洋流中小区域的可变性，并描述生物生产的主导因素。在大多数区域，时间和空间环境变化是由于大尺度环流单独或与近海输送(当地强迫)相结合造成的。观测到的生物量和初级生产力的经向和季节分布与代表大尺度环流的成分高度相关。大西洋EBCs中特定营养浓度所维持的生物量是太平洋EBCs的两倍。这种明显更高的效率可能是由于铁的可用性、物理滞留或浮游生物群落结构的差异。(C)2003爱思唯尔有限公司。保留所有权利。
High productivity (maxima similar to3 g C m(-2) day(-1)) of the Eastern Boundary Currents (EBCs), i.e. the California, Peru-Humboldt, Canary and Benguela Currents, is driven by a combination of local forcing and large-scale circulation. The characteristics of the deep water brought to the surface by upwelling favorable winds depend on the large-scale circulation patterns. Here we use a new hydrographic and nutrient climatology together with satellite measurements of the wind vector, sea-surface temperature (SST), chlorophyll concentration, and primary production modeled from ocean color to quantify the meridional and seasonal patterns of upwelling dynamics and biological response. The unprecedented combination of data sets allows us to describe objectively the variability for small regions within each current and to characterize the governing factors for biological production. The temporal and spatial environmental variability was due in most regions to large-scale circulation, alone or in combination with offshore transport (local forcing). The observed meridional and seasonal patterns of biomass and primary production were most highly correlated to components representing large-scale circulation. The biomass sustained by a given nutrient concentration in the Atlantic EBCs was twice as large as that of the Pacific EBCs. This apparent greater efficiency may be due to availability of iron, physical retention, or differences in planktonic community structure. (C) 2003 Elsevier Ltd. All rights reserved.