Circulation Studies of the California Current System from Direct Velocity Observations

将利用1993年至2003年加州海洋渔业合作调查（CalCOFI）每季度巡航期间船上声学多普勒海流剖面仪观测所得的大量海流测量数据，以及包括水文地理在内的其他测量数据，对加州中部和南部外海加州海流系统的环流和能量学进行研究。表面漂移和卫星测高。通过利用各种数据集的采样强度，将揭示大多数历史测量无法解决的环流特征。由于取样的重复性质，这些特征的重要性也可以确定。本提案将着重于解决加州南部和中部海域CCS的三个问题，其中直接流速观测是必不可少的：1）500 m处流速的季节和年际变化（该区域大多数水文研究使用的传统零流速面）; 2）暗流、南加州涡和沿岸流的结构和动力学，以及它们在CCS热量和营养物收支中的作用; 3）中尺度涡动场，其季节和年际变化，其能量学，以及其在建立特性分布中的作用。

Studies of the circulation and energetics of the California Current System (CCS) off central and southern California will be carried using the extensive set of ocean current measurements from shipboard acoustic Doppler current profiler (ADCP) observations made on the quarterly cruises of the California Cooperative Oceanic Fisheries Investigations (CalCOFI) from 1993 to 2003, together with additional measurements including hydrography, surface drifters, and satellite altimetry. By exploiting the sampling strengths of the various datasets, features of the circulation will be revealed that are not resolved by most historical measurements. The significance of these features can also be ascertained due to the repeated nature of the sampling. This proposal will focus on addressing three questions about the CCS off southern and central California for which direct velocity observations are essential: 1) the seasonal and inter-annual variability of the flow at 500 m (the traditional zero velocity surface used by most hydrographic studies of the region); 2) the structure and dynamics of the Undercurrent, the Southern California Eddy and the variable inshore flows, and their role in the heat and nutrient budgets of the CCS; and 3) the mesoscale eddy field, its seasonal and inter-annual variability, its energetics, and its role in establishing property distributions.