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Mesoscale SST Dynamics in the Kuroshio-Oyashio Extension Region

机译：黑潮-大矢潮扩展区中尺度SST动力学

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摘要

Mesoscale eddies have been extensively studied based on the sea surface height anomaly (SSHA). However, it is the sea surface temperature anomaly (SSTA) that is vital to the mesoscale eddy-atmosphere interactions. In this study, we analyze the amplitude relationship between SSHA and SSTA (referred to as the H-T amplitude relationship) in the Kuroshio-Oyashio extension (KOE) region using both observational and reanalysis data. It is found that the spatial distribution of mesoscale SSHA variance is not coincident with mesoscale SSTA variance. The former peaks in the Kuroshio extension around 35 degrees N whereas the latter is strongest in the Oyashio extension around 40 degrees N. Regression analyses indicate that the rate of SSTA change per SSHA change is 1.8 degrees C m(-1) in the Kuroshio extension (145 degrees-160 degrees E, 34 degrees-36 degrees N) but increases drastically by a factor of 3-4 to 6.2 degrees C m(-1) in the Oyashio extension (145 degrees-160 degrees E, 39 degrees-41 degrees N). A theoretical expression for the H-T amplitude relationship is derived. Analyzing this expression suggests that the stronger H-T amplitude relationship in the Oyashio extension than the Kuroshio extension is mainly attributed to 1) the smaller thermal expansion coefficient due to the colder background SST, 2) the stronger salinity compensation effect that works against the contribution of SSTA change to sea surface density anomaly (SSDA) change, and 3) the shallower vertical structure of mesoscale eddies. The second factor is ascribed to the strong surface salinity front in the Oyashio extension, while the third factor is found to be qualitatively consistent with the shallower baroclinically unstable modes due to the shallower density front there.
机译：中尺度涡流已经根据海面高度异常（SSHA）进行了广泛的研究。然而，对中尺度涡旋-大气相互作用至关重要的是海面温度异常（SSTA）。在这项研究中，我们使用观测数据和再分析数据分析了黑潮-矢潮扩展（KOE）区域中SSHA和SSTA之间的振幅关系（称为H-T振幅关系）。发现中尺度SSHA方差的空间分布与中尺度SSTA方差不一致。前者在北约35度附近的黑潮延伸中达到峰值，而后者在北约40度附近的Oyashio延伸中最强。回归分析表明，在黑潮中，每个SSHA变化的SSTA变化速率为1.8 C m（-1）。 （145度-160度E，34度-36度N），但在Oyashio延伸区（145度-160度E，39度-41）急剧增加3-4至6.2 C m（-1）度N）。推导出H-T振幅关系的理论表达式。分析此表达式表明，Oyashio延伸区中的HT振幅关系比Kuroshio延伸区更强，主要归因于1）由于背景SST较低而导致的热膨胀系数较小，2）较强的盐度补偿效应不利于SSTA的贡献改变为海面密度异常（SSDA），以及3）中尺度涡旋的较浅垂直结构。第二个因素归因于Oyashio延伸区的强盐度锋面，而第三个因质密度较弱而定性与较浅的斜压不稳定模式定性一致。

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  • 来源
    《Journal of Physical Oceanography》 |2019年第5期|1339-1352|共14页
  • 作者

    Jing Zhao; Chang Ping; Shan Xuan; Wang Shengpeng; Wu Lixin; Kurian Jaison;

  • 作者单位

    Ocean Univ China, Inst Adv Ocean Studies, Key Lab Phys Oceanog, Qingdao, Shandong, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Qingdao, Shandong, Peoples R China;

    Ocean Univ China, Minist Educ, Key Lab Phys Oceanog, Qingdao, Shandong, Peoples R China|Pilot Natl Lab Marine Sci & Technol, Qingdao, Shandong, Peoples R China|Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA|Texas A&M Univ, Dept Atmospher Sci, College Stn, TX USA;

    Ocean Univ China, Inst Adv Ocean Studies, Key Lab Phys Oceanog, Qingdao, Shandong, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Qingdao, Shandong, Peoples R China;

    Ocean Univ China, Inst Adv Ocean Studies, Key Lab Phys Oceanog, Qingdao, Shandong, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Qingdao, Shandong, Peoples R China;

    Ocean Univ China, Inst Adv Ocean Studies, Key Lab Phys Oceanog, Qingdao, Shandong, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Qingdao, Shandong, Peoples R China;

    Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA;

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  • 正文语种 eng
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  • 关键词

    Atmosphere-ocean interaction; Eddies; Mesoscale processes; Sea surface temperature;

    机译：大气-海洋相互作用;涡旋;中尺度过程;海表温度;

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