Mesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific

Oceanic mesoscale eddies are associated with large thermodynamic anomalies, yet so far they are most commonly studied in terms of surface temperature and in the sense of composite mean. Here we employ an objective eddy identification and tracking algorithm together with a novel matching and filling...

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Autores principales:	Jiang Zhou, Guidi Zhou, Hailong Liu, Zhuhua Li, Xuhua Cheng
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	mesoscale eddy sea surface temperature upper ocean heat content isothermal layer depth sea surface height Science Q General. Including nature conservation, geographical distribution QH1-199.5
Acceso en línea:	https://doaj.org/article/343db61c29fc49a6b17a78bfe12fb681
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spelling	oai:doaj.org-article:343db61c29fc49a6b17a78bfe12fb6812021-11-12T04:32:41ZMesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific2296-774510.3389/fmars.2021.756918https://doaj.org/article/343db61c29fc49a6b17a78bfe12fb6812021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmars.2021.756918/fullhttps://doaj.org/toc/2296-7745Oceanic mesoscale eddies are associated with large thermodynamic anomalies, yet so far they are most commonly studied in terms of surface temperature and in the sense of composite mean. Here we employ an objective eddy identification and tracking algorithm together with a novel matching and filling procedure to more thoroughly examine eddy-induced thermodynamic anomalies in the North Pacific, their relationship with eddy amplitude (SSH), and the percentage of variability they explain on various timescales from submonthly to interannual. The thermodynamic anomalies are investigated in terms of sea surface temperature (SST), isothermal layer depth (ITD), and upper ocean heat content (HCT). Most eddies are weak in amplitude and are associated with small thermodynamic anomalies. In the sense of composite mean, anticyclonic eddies are generally warm eddies with deeper isothermal layer and larger heat content, and the reverse is true for cyclonic eddies. A small fraction of eddies, most probably subsurface eddies, exhibits the opposite polarities. Linear relationships with eddy amplitude are found for each of the thermodynamic parameters but with different level of scatter and seasonality. HCT-amplitude relation scatters the least and has the smallest seasonal difference, ITD-amplitude relation has the largest scatter and seasonality, while SST-amplitude relation is in between. For the Kuroshio and Oyashio Extension region, the most eddy-rich region in the North Pacific, eddies are responsible for over 50% of the total SSH variability up to the intra-seasonal scale, and ITD and HCT variability up to interannual. Eddy-induced SST variability is the highest along the Oyashio Extension Front on the order of 40–60% on submonthly scales. These results highlight the role of mesoscale eddies in ocean thermodynamic variability and in air-sea interaction.Jiang ZhouJiang ZhouGuidi ZhouGuidi ZhouHailong LiuZhuhua LiZhuhua LiXuhua ChengXuhua ChengXuhua ChengFrontiers Media S.A.articlemesoscale eddysea surface temperatureupper ocean heat contentisothermal layer depthsea surface heightScienceQGeneral. Including nature conservation, geographical distributionQH1-199.5ENFrontiers in Marine Science, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mesoscale eddy sea surface temperature upper ocean heat content isothermal layer depth sea surface height Science Q General. Including nature conservation, geographical distribution QH1-199.5
spellingShingle	mesoscale eddy sea surface temperature upper ocean heat content isothermal layer depth sea surface height Science Q General. Including nature conservation, geographical distribution QH1-199.5 Jiang Zhou Jiang Zhou Guidi Zhou Guidi Zhou Hailong Liu Zhuhua Li Zhuhua Li Xuhua Cheng Xuhua Cheng Xuhua Cheng Mesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific
description	Oceanic mesoscale eddies are associated with large thermodynamic anomalies, yet so far they are most commonly studied in terms of surface temperature and in the sense of composite mean. Here we employ an objective eddy identification and tracking algorithm together with a novel matching and filling procedure to more thoroughly examine eddy-induced thermodynamic anomalies in the North Pacific, their relationship with eddy amplitude (SSH), and the percentage of variability they explain on various timescales from submonthly to interannual. The thermodynamic anomalies are investigated in terms of sea surface temperature (SST), isothermal layer depth (ITD), and upper ocean heat content (HCT). Most eddies are weak in amplitude and are associated with small thermodynamic anomalies. In the sense of composite mean, anticyclonic eddies are generally warm eddies with deeper isothermal layer and larger heat content, and the reverse is true for cyclonic eddies. A small fraction of eddies, most probably subsurface eddies, exhibits the opposite polarities. Linear relationships with eddy amplitude are found for each of the thermodynamic parameters but with different level of scatter and seasonality. HCT-amplitude relation scatters the least and has the smallest seasonal difference, ITD-amplitude relation has the largest scatter and seasonality, while SST-amplitude relation is in between. For the Kuroshio and Oyashio Extension region, the most eddy-rich region in the North Pacific, eddies are responsible for over 50% of the total SSH variability up to the intra-seasonal scale, and ITD and HCT variability up to interannual. Eddy-induced SST variability is the highest along the Oyashio Extension Front on the order of 40–60% on submonthly scales. These results highlight the role of mesoscale eddies in ocean thermodynamic variability and in air-sea interaction.
format	article
author	Jiang Zhou Jiang Zhou Guidi Zhou Guidi Zhou Hailong Liu Zhuhua Li Zhuhua Li Xuhua Cheng Xuhua Cheng Xuhua Cheng
author_facet	Jiang Zhou Jiang Zhou Guidi Zhou Guidi Zhou Hailong Liu Zhuhua Li Zhuhua Li Xuhua Cheng Xuhua Cheng Xuhua Cheng
author_sort	Jiang Zhou
title	Mesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific
title_short	Mesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific
title_full	Mesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific
title_fullStr	Mesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific
title_full_unstemmed	Mesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific
title_sort	mesoscale eddy-induced ocean dynamic and thermodynamic anomalies in the north pacific
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/343db61c29fc49a6b17a78bfe12fb681
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Mesoscale Eddy-Induced Ocean Dynamic and Thermodynamic Anomalies in the North Pacific

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