On the Role of Eddy Mixing in the Subtropical Ocean Circulation

Most of the classic wind-driven circulation theories based on Sverdrup balance have neglected the profound influence of eddy mixing on the large-scale potential vorticity (PV) distribution, thus failing to explain some prominent features of the observed circulation. In this study, using a series of...
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Gespeichert in:

Autor*in:	Tongya Liu [verfasserIn] Hsien-Wang Ou [verfasserIn] Xiaohui Liu [verfasserIn] Dake Chen [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	eddy mixing potential vorticity homogenization Sverdrup balance subtropical gyre upper ocean circulation

Übergeordnetes Werk:	In: Frontiers in Marine Science - Frontiers Media S.A., 2015, 9(2022)
Übergeordnetes Werk:	volume:9 ; year:2022

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3389/fmars.2022.832992

Katalog-ID:	DOAJ023459182

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520			\|a Most of the classic wind-driven circulation theories based on Sverdrup balance have neglected the profound influence of eddy mixing on the large-scale potential vorticity (PV) distribution, thus failing to explain some prominent features of the observed circulation. In this study, using a series of numerical experiments based on the MITgcm, we diagnose the PV balance to quantify the effect of eddy mixing on the subtropical gyre. Four horizontal grid-spacings of 1°, 1/3.2°, 1/10°, and 1/32° are selected to compare the structure of the upper-ocean circulation to examine the effect of different eddy influences. In the 1° grid case, the thermocline structure is as predicted by the Sverdrup dynamics, with its maximum depth located in the subtropical interior where the wind stress curl is strongest. With increasing resolution, however, this maximum depth is displaced towards the subtropical front, which more closely resembles the observed thermocline. From 1° to 1/32°, the enhanced eddy mixing tends to homogenize the macroscopic PV in the subtropical gyre and reduces the meridional PV range by about 75% of the non-eddy (1°) solution; and the region where Sverdrup balance holds is relegated to isolated patches, with its area reduced by about 60%. Furthermore, sensitivity experiments show that the observed thermocline structure is well reproduced in eddy-resolving runs, indicating that the PV mixing provides a reasonable explanation of the subtropical circulation. Our results suggest that the Sverdrup relationship should be treated carefully in the eddy-rich region, even in the subtropical interior.
650		4	\|a eddy mixing
650		4	\|a potential vorticity homogenization
650		4	\|a Sverdrup balance
650		4	\|a subtropical gyre
650		4	\|a upper ocean circulation
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700	0		\|a Dake Chen \|e verfasserin \|4 aut
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spelling	10.3389/fmars.2022.832992 doi (DE-627)DOAJ023459182 (DE-599)DOAJ534c56bbb4ad4b3eb21e9d03037183a9 DE-627 ger DE-627 rakwb eng QH1-199.5 Tongya Liu verfasserin aut On the Role of Eddy Mixing in the Subtropical Ocean Circulation 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Most of the classic wind-driven circulation theories based on Sverdrup balance have neglected the profound influence of eddy mixing on the large-scale potential vorticity (PV) distribution, thus failing to explain some prominent features of the observed circulation. In this study, using a series of numerical experiments based on the MITgcm, we diagnose the PV balance to quantify the effect of eddy mixing on the subtropical gyre. Four horizontal grid-spacings of 1°, 1/3.2°, 1/10°, and 1/32° are selected to compare the structure of the upper-ocean circulation to examine the effect of different eddy influences. In the 1° grid case, the thermocline structure is as predicted by the Sverdrup dynamics, with its maximum depth located in the subtropical interior where the wind stress curl is strongest. With increasing resolution, however, this maximum depth is displaced towards the subtropical front, which more closely resembles the observed thermocline. From 1° to 1/32°, the enhanced eddy mixing tends to homogenize the macroscopic PV in the subtropical gyre and reduces the meridional PV range by about 75% of the non-eddy (1°) solution; and the region where Sverdrup balance holds is relegated to isolated patches, with its area reduced by about 60%. Furthermore, sensitivity experiments show that the observed thermocline structure is well reproduced in eddy-resolving runs, indicating that the PV mixing provides a reasonable explanation of the subtropical circulation. Our results suggest that the Sverdrup relationship should be treated carefully in the eddy-rich region, even in the subtropical interior. eddy mixing potential vorticity homogenization Sverdrup balance subtropical gyre upper ocean circulation Science Q General. Including nature conservation, geographical distribution Hsien-Wang Ou verfasserin aut Xiaohui Liu verfasserin aut Xiaohui Liu verfasserin aut Dake Chen verfasserin aut Dake Chen verfasserin aut In Frontiers in Marine Science Frontiers Media S.A., 2015 9(2022) (DE-627)779393945 (DE-600)2757748-X 22967745 nnns volume:9 year:2022 https://doi.org/10.3389/fmars.2022.832992 kostenfrei https://doaj.org/article/534c56bbb4ad4b3eb21e9d03037183a9 kostenfrei https://www.frontiersin.org/articles/10.3389/fmars.2022.832992/full kostenfrei https://doaj.org/toc/2296-7745 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2022
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allfieldsSound	10.3389/fmars.2022.832992 doi (DE-627)DOAJ023459182 (DE-599)DOAJ534c56bbb4ad4b3eb21e9d03037183a9 DE-627 ger DE-627 rakwb eng QH1-199.5 Tongya Liu verfasserin aut On the Role of Eddy Mixing in the Subtropical Ocean Circulation 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Most of the classic wind-driven circulation theories based on Sverdrup balance have neglected the profound influence of eddy mixing on the large-scale potential vorticity (PV) distribution, thus failing to explain some prominent features of the observed circulation. In this study, using a series of numerical experiments based on the MITgcm, we diagnose the PV balance to quantify the effect of eddy mixing on the subtropical gyre. Four horizontal grid-spacings of 1°, 1/3.2°, 1/10°, and 1/32° are selected to compare the structure of the upper-ocean circulation to examine the effect of different eddy influences. In the 1° grid case, the thermocline structure is as predicted by the Sverdrup dynamics, with its maximum depth located in the subtropical interior where the wind stress curl is strongest. With increasing resolution, however, this maximum depth is displaced towards the subtropical front, which more closely resembles the observed thermocline. From 1° to 1/32°, the enhanced eddy mixing tends to homogenize the macroscopic PV in the subtropical gyre and reduces the meridional PV range by about 75% of the non-eddy (1°) solution; and the region where Sverdrup balance holds is relegated to isolated patches, with its area reduced by about 60%. Furthermore, sensitivity experiments show that the observed thermocline structure is well reproduced in eddy-resolving runs, indicating that the PV mixing provides a reasonable explanation of the subtropical circulation. Our results suggest that the Sverdrup relationship should be treated carefully in the eddy-rich region, even in the subtropical interior. eddy mixing potential vorticity homogenization Sverdrup balance subtropical gyre upper ocean circulation Science Q General. Including nature conservation, geographical distribution Hsien-Wang Ou verfasserin aut Xiaohui Liu verfasserin aut Xiaohui Liu verfasserin aut Dake Chen verfasserin aut Dake Chen verfasserin aut In Frontiers in Marine Science Frontiers Media S.A., 2015 9(2022) (DE-627)779393945 (DE-600)2757748-X 22967745 nnns volume:9 year:2022 https://doi.org/10.3389/fmars.2022.832992 kostenfrei https://doaj.org/article/534c56bbb4ad4b3eb21e9d03037183a9 kostenfrei https://www.frontiersin.org/articles/10.3389/fmars.2022.832992/full kostenfrei https://doaj.org/toc/2296-7745 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2022
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source	In Frontiers in Marine Science 9(2022) volume:9 year:2022
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authorswithroles_txt_mv	Tongya Liu @@aut@@ Hsien-Wang Ou @@aut@@ Xiaohui Liu @@aut@@ Dake Chen @@aut@@
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callnumber-first	Q - Science
author	Tongya Liu
spellingShingle	Tongya Liu misc QH1-199.5 misc eddy mixing misc potential vorticity homogenization misc Sverdrup balance misc subtropical gyre misc upper ocean circulation misc Science misc Q misc General. Including nature conservation, geographical distribution On the Role of Eddy Mixing in the Subtropical Ocean Circulation
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topic_title	QH1-199.5 On the Role of Eddy Mixing in the Subtropical Ocean Circulation eddy mixing potential vorticity homogenization Sverdrup balance subtropical gyre upper ocean circulation
topic	misc QH1-199.5 misc eddy mixing misc potential vorticity homogenization misc Sverdrup balance misc subtropical gyre misc upper ocean circulation misc Science misc Q misc General. Including nature conservation, geographical distribution
topic_unstemmed	misc QH1-199.5 misc eddy mixing misc potential vorticity homogenization misc Sverdrup balance misc subtropical gyre misc upper ocean circulation misc Science misc Q misc General. Including nature conservation, geographical distribution
topic_browse	misc QH1-199.5 misc eddy mixing misc potential vorticity homogenization misc Sverdrup balance misc subtropical gyre misc upper ocean circulation misc Science misc Q misc General. Including nature conservation, geographical distribution
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title	On the Role of Eddy Mixing in the Subtropical Ocean Circulation
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title_full	On the Role of Eddy Mixing in the Subtropical Ocean Circulation
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title_sort	on the role of eddy mixing in the subtropical ocean circulation
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title_auth	On the Role of Eddy Mixing in the Subtropical Ocean Circulation
abstract	Most of the classic wind-driven circulation theories based on Sverdrup balance have neglected the profound influence of eddy mixing on the large-scale potential vorticity (PV) distribution, thus failing to explain some prominent features of the observed circulation. In this study, using a series of numerical experiments based on the MITgcm, we diagnose the PV balance to quantify the effect of eddy mixing on the subtropical gyre. Four horizontal grid-spacings of 1°, 1/3.2°, 1/10°, and 1/32° are selected to compare the structure of the upper-ocean circulation to examine the effect of different eddy influences. In the 1° grid case, the thermocline structure is as predicted by the Sverdrup dynamics, with its maximum depth located in the subtropical interior where the wind stress curl is strongest. With increasing resolution, however, this maximum depth is displaced towards the subtropical front, which more closely resembles the observed thermocline. From 1° to 1/32°, the enhanced eddy mixing tends to homogenize the macroscopic PV in the subtropical gyre and reduces the meridional PV range by about 75% of the non-eddy (1°) solution; and the region where Sverdrup balance holds is relegated to isolated patches, with its area reduced by about 60%. Furthermore, sensitivity experiments show that the observed thermocline structure is well reproduced in eddy-resolving runs, indicating that the PV mixing provides a reasonable explanation of the subtropical circulation. Our results suggest that the Sverdrup relationship should be treated carefully in the eddy-rich region, even in the subtropical interior.
abstractGer	Most of the classic wind-driven circulation theories based on Sverdrup balance have neglected the profound influence of eddy mixing on the large-scale potential vorticity (PV) distribution, thus failing to explain some prominent features of the observed circulation. In this study, using a series of numerical experiments based on the MITgcm, we diagnose the PV balance to quantify the effect of eddy mixing on the subtropical gyre. Four horizontal grid-spacings of 1°, 1/3.2°, 1/10°, and 1/32° are selected to compare the structure of the upper-ocean circulation to examine the effect of different eddy influences. In the 1° grid case, the thermocline structure is as predicted by the Sverdrup dynamics, with its maximum depth located in the subtropical interior where the wind stress curl is strongest. With increasing resolution, however, this maximum depth is displaced towards the subtropical front, which more closely resembles the observed thermocline. From 1° to 1/32°, the enhanced eddy mixing tends to homogenize the macroscopic PV in the subtropical gyre and reduces the meridional PV range by about 75% of the non-eddy (1°) solution; and the region where Sverdrup balance holds is relegated to isolated patches, with its area reduced by about 60%. Furthermore, sensitivity experiments show that the observed thermocline structure is well reproduced in eddy-resolving runs, indicating that the PV mixing provides a reasonable explanation of the subtropical circulation. Our results suggest that the Sverdrup relationship should be treated carefully in the eddy-rich region, even in the subtropical interior.
abstract_unstemmed	Most of the classic wind-driven circulation theories based on Sverdrup balance have neglected the profound influence of eddy mixing on the large-scale potential vorticity (PV) distribution, thus failing to explain some prominent features of the observed circulation. In this study, using a series of numerical experiments based on the MITgcm, we diagnose the PV balance to quantify the effect of eddy mixing on the subtropical gyre. Four horizontal grid-spacings of 1°, 1/3.2°, 1/10°, and 1/32° are selected to compare the structure of the upper-ocean circulation to examine the effect of different eddy influences. In the 1° grid case, the thermocline structure is as predicted by the Sverdrup dynamics, with its maximum depth located in the subtropical interior where the wind stress curl is strongest. With increasing resolution, however, this maximum depth is displaced towards the subtropical front, which more closely resembles the observed thermocline. From 1° to 1/32°, the enhanced eddy mixing tends to homogenize the macroscopic PV in the subtropical gyre and reduces the meridional PV range by about 75% of the non-eddy (1°) solution; and the region where Sverdrup balance holds is relegated to isolated patches, with its area reduced by about 60%. Furthermore, sensitivity experiments show that the observed thermocline structure is well reproduced in eddy-resolving runs, indicating that the PV mixing provides a reasonable explanation of the subtropical circulation. Our results suggest that the Sverdrup relationship should be treated carefully in the eddy-rich region, even in the subtropical interior.
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title_short	On the Role of Eddy Mixing in the Subtropical Ocean Circulation
url	https://doi.org/10.3389/fmars.2022.832992 https://doaj.org/article/534c56bbb4ad4b3eb21e9d03037183a9 https://www.frontiersin.org/articles/10.3389/fmars.2022.832992/full https://doaj.org/toc/2296-7745
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On the Role of Eddy Mixing in the Subtropical Ocean Circulation

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