The California Current system off Monterey, California: physical and biological coupling
The California Current system off Monterey, California: physical and biological coupling
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DOI：
10.1016/s0967-0645(03)00134-6
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发表时间：
2003-01-01
影响因子：
3
通讯作者：
Chavez, FP
中科院分区：
文献类型：
--
作者：
Collins, CA;Pennington, JT;Chavez, FP
1988-2002 年期间垂直于加州中部海岸的重复水生生物调查表明物理循环与生物生产之间存在很强的耦合性。距海岸约 100-200 公里的一股向赤道流动的急流标志着加州洋流 (CC) 的近岸边缘。这架“CC Jet”在冬末和春季达到了最高速度。这架喷气式飞机将近海的生物生产力水域与近海的低生产力水域分开。近岸水域的平均水流是向极地的。然而，这种气流在春末和夏季被地表增强、向赤道流动的沿海上升急流中断。上升流喷流与营养物、叶绿素-a 和初级生产的最大值一致。近海区域的年变率与（1）与加州海流系统加速的地转调整相关的垂直密度斜运动有关，以及（2）沿海上升流。在近海水域，年度循环只占变化的一小部分，表明该区域涡流和曲流占主导地位（J. Geophys. Res. 92 (1987) 12947）。近海区域是中营养到贫营养的，地下叶绿素含量最高，高于营养线。加州洋流急流下方可能会发生相当大的俯冲，这是生物物质向深海输出的一个重要过程。由爱思唯尔有限公司出版
Repeated hydrobiological surveys over the period 1988-2002 perpendicular to the central California coast indicate strong coupling between physical circulation and biological production. An equatorward-flowing jet about 100-200 km from shore marked the inshore edge of the California Current (CC). This "CC Jet" had its highest velocities during late winter and spring. The jet divided inshore, biologically productive waters from offshore, low-production waters. Mean flow in the inshore waters is poleward. However, this flow is interrupted in late spring and summer by a Surface-enhanced, equatorward-flowing, coastal upwelling jet. The upwelling jet coincides with maxima of nutrients, chlorophyll-a and primary production. Annual variability in the inshore zone is related to (1) vertical pycnocline movements associated with geostrophic adjustments to accelerations of the California Current system, and (2) coastal upwelling. In offshore waters, the annual cycle accounted for a small fraction of the variability, indicating the dominance of eddies and meanders in this zone (J. Geophys. Res. 92 (1987) 12947). The offshore regime was mesotrophic to oligotrophic, with a subsurface chlorophyll-a maximum above the nutricline. Considerable subduction may occur under the California Current jet and be an important process in the export of biogenic material to the deep sea. Published by Elsevier Ltd.