Processes That Influence Bottom Temperatures in the California Current System

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
M. A. Alexander, J. D. Scott, M. G. Jacox, D. J. Amaya, L. M. Wilczynski
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Abstract

Bottom water temperature (BWT) strongly influences marine organisms in coastal waters. Although subsurface observations are limited, the recent development of high-resolution reanalyses enables a detailed three-dimensional view of the ocean, including on the continental shelf. Here, we use the GLORYS 1/12° (∼9 km) reanalysis during 1993–2019 to examine processes that influence BWT anomalies on the shelf (≤400 m bottom depth) off the West Coast of Baja California and the contiguous US. We examine the relationship between BWT anomalies and other ocean variables, including mixed layer depth (MLD), thermocline depth (TD), thermocline and bottom temperature gradients, and bottom currents. The strongest and most spatially coherent connections with BWT anomalies occur for MLD during winter and TD in summer. BWT anomalies are also correlated with the local sea surface height (SSH) anomalies with maxima at 2–5 days lag. On subseasonal timescales, the lag of the maximum coherence of SSH at the southern tip of Baja California with both SSH and BWT increases northwards, consistent with propagating coastally trapped waves (CTWs), although the BWT anomalies decrease with latitude. Like SST and SSH, BWT anomalies are coherent along the entire West Coast on interannual timescales, reflecting ENSO's influence on the northeast Pacific. In contrast to CTWs, wind-driven upwelling's impact on BWT anomalies increases with latitude. Regional ocean model experiments confirm the GLORYS analysis and highlight the importance of remote wind-driven effects, in addition to local winds, on BWT in the northern part of the domain.

Abstract Image

影响加州洋流系统底部温度的过程
底水温对近海海洋生物的影响很大。虽然地下观测是有限的,但最近高分辨率再分析的发展使海洋,包括大陆架的详细三维视图成为可能。在这里,我们使用1993-2019年期间的GLORYS 1/12°(~ 9 km)再分析来检查影响下加利福尼亚州西海岸和美国相邻大陆架(底部深度≤400 m)上BWT异常的过程。我们研究了BWT异常与其他海洋变量的关系,包括混合层深度(MLD)、温跃层深度(TD)、温跃层和底温梯度以及底流。与BWT异常最强和空间上最一致的联系出现在冬季的MLD和夏季的TD。BWT异常也与局地海面高度(SSH)异常相关,最大异常滞后2 ~ 5 d。在亚季节时间尺度上,下加利福尼亚州南端的海面高度与海面高度和BWT的最大相干性的滞后向北增加,这与沿海捕获波(CTWs)的传播一致,尽管BWT异常随纬度而减小。与海温和海面高度一样,整个西海岸的BWT异常在年际时间尺度上是一致的,反映了ENSO对东北太平洋的影响。与ctw相反,风驱动的上升流对BWT异常的影响随着纬度的增加而增加。区域海洋模式实验证实了GLORYS的分析,并强调了除局地风外,远程风驱动效应对该区域北部BWT的重要性。
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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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