Upwelling and boundary circulation off Northwest Africa as depicted by infrared and visible satellite observations
Upwelling and boundary circulation off Northwest Africa as depicted by infrared and visible satellite observations
复制标题
红外和可见光卫星观测描绘的西北非附近的上升流和边界环流
DOI：
10.1016/0079-6611(91)90012-b
复制
发表时间：
1991
影响因子：
4.1
通讯作者：
P. Schlittenhardt
中科院分区：
文献类型：
--
作者：
L. V. Camp;Leo Nykjær;E. Mittelstaedt;P. Schlittenhardt
介绍并解释了西北非附近卫星得出的表面温度（AVHRR 数据）和叶绿素类色素浓度（CZCS 数据）。海面温度（SST）和色素浓度被用作上升流和东部边界环流的指标。卫星得出的参数的分布模式为西北非海岸的上升流系统提供了新的见解。每个季节都选择了典型的海表温度图像（此处显示的大多数海表温度图像来自 1987 年）。对每日风的分析表明，这些风与近岸温度模式有关。颜料浓度图像选自1980-1985年期间。海温图像清楚地显示了西北非洲海岸沿线的上升流变化。每日风场的分析与海温图像中观察到的上升流的时空变化一致。在图像中注意到现有文献中未描述的几种介尺度图案。这些适用于加那利群岛尾流中发现的长长的暖水路径，以及在北纬 32° 至 31°N 之间延伸至远海的凉爽沿海水流。其他不寻常的加热模式还发现在吉尔角以南的风和洋流阴影区的陆架上以及北纬约 24° 的里奥德奥罗半岛近岸海湾。最后，浅海且大部分受庇护的阿尔金湾的特殊水文条件在海温图像中通过观察到的特定温度模式得到了证实。
Satellite derived surface temperatures (AVHRR data) and chlorophyll-like pigment concentrations (CZCS data) off Northwest Africa are presented and interpreted. Sea surface temperature (SST) and pigment concentrations are used as indicatoprs for upwelling and eastern boundary circulation. The distribution patterns of satellite derived parameters offer new insights into the upwelling system of the Northwest African coast. Typical SST images have been selected for each season (most of the SST images shown here are from 1987). Analyses of daily winds show these are related to the near-shore temperature patterns. The images of pigment concentrations are selected from the period 1980–1985.The SST images clearly show the upwelling variability along the coast of Northwest Africa. The analyses of daily wind fields are consistent with the spatial and temporal variability of upwelling as observed in the SST images. Several mesoscale patterns which have not been described in the existing literature are noticed in the images. These apply to the long warm water trails found in the wake of the Canary Islands and to the filaments of cool coastal water extending far offshore between 32°N and 31°N. Other unusual heating patterns are found on the shelf in the shadow zone of winds and currents south of Cape Ghir and in the bay inshore of the peninsula of Rio de Oro at approximately 24°N. Finally, the special hydrographic conditions on the shallow and mostly sheltered Banc d'Arguin are confirmed in the SST images by the particular temperature patterns observed.