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首页> 外文期刊>Journal of Physical Oceanography >Annual and Interannual Variability in the California Current System: Comparison of an Ocean State Estimate with a Network of Underwater Gliders
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Annual and Interannual Variability in the California Current System: Comparison of an Ocean State Estimate with a Network of Underwater Gliders

机译：加州现行系统的年度和年度间可变性：海洋状态估计与水下滑翔机网络的比较

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摘要

A data-constrained state estimate of the southern California Current System (CCS) is presented and compared with withheld California Cooperative Oceanic Fisheries Investigations (CalCOFI) data and assimilated glider data over 2007-17. The objective of this comparison is to assess the ability of the California State Estimate (CASE) to reproduce the key physical features of the CCS mean state, annual cycles, and interannual variability along the three sections of the California Underwater Glider Network (CUGN). The assessment focuses on several oceanic metrics deemed most important for characterizing physical variability in the CCS: 50-m potential temperature, 80-m salinity, and 26 kg m(-3) isopycnal depth and salinity. In the time mean, the CASE reproduces large-scale thermohaline and circulation structures, including observed temperature gradients, shoaling isopycnals, and the locations and magnitudes of the equatorward California Current and poleward California Undercurrent. With respect to the annual cycle, the CASE captures the phase and, to a lesser extent, the magnitude of upper-ocean warming and stratification from late summer to early fall and of isopycnal heave during springtime upwelling. The CASE also realistically captures near-surface diapycnal mixing during upwelling season and the semiannual cycle of the California Undercurrent. In terms of interannual variability, the most pronounced signals are the persistent warming and downwelling anomalies of 2014-16 and a positive isopycnal salinity anomaly that peaked with the 2015-16 El Nino.
机译：提出了南加州现行系统（CCS）的数据受限的状态估计值，并将其与2007-17年度保留的加利福尼亚合作海洋渔业调查（CalCOFI）数据和同化滑翔机数据进行了比较。进行此比较的目的是评估加利福尼亚州估计（CASE）沿加利福尼亚水下滑翔机网络（CUGN）的三个部分再现CCS平均状态，年周期和年际变化的关键物理特征的能力。评估集中于被认为是表征CCS物理可变性最重要的几个海洋指标：50 m的潜在温度，80 m的盐度和26 kg m（-3）的等深深度和盐度。在时间平均值上，CASE再现了大规模的热盐和循环结构，包括观测到的温度梯度，浅滩等深线以及赤道加利福尼亚流和极加利福尼亚流的位置和大小。关于年度周期，CASE记录了从夏末到初秋的上海洋变暖和分层的阶段，以及在春季上升流中等腰隆起的阶段，以及程度较小的阶段。该案例还真实地捕获了上升流季节和加利福尼亚暗流的半年周期期间的近地表辉岩混合。就年际变化而言，最明显的信号是2014-16年持续的升温和下沉异常，以及2015-16年厄尔尼诺现象出现的正等位盐度异常。

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