The effect of normal and abnormal eddies on the mixed layer depth in the global ocean
Mesoscale eddies are broadly distributed over the global ocean and play a significant role in modulating the spatiotemporal evolution of mixed layer depth (MLD). The presence of abnormal eddies in the ocean has been shown; however, the precise quantification of the effect of eddies on MLD, given the...
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ftdoajarticles:oai:doaj.org/article:a050be11cfba4c839c746319ed72b0c4 2023-05-15T18:25:56+02:00 The effect of normal and abnormal eddies on the mixed layer depth in the global ocean Ji Hao Jie Yang Ge Chen 2023-01-01T00:00:00Z https://doi.org/10.3389/fmars.2022.981505 https://doaj.org/article/a050be11cfba4c839c746319ed72b0c4 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2022.981505/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.981505 https://doaj.org/article/a050be11cfba4c839c746319ed72b0c4 Frontiers in Marine Science, Vol 9 (2023) mesoscale eddy oceanic mixed layer normal eddy abnormal eddy potential density anomaly Argo float Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2023 ftdoajarticles https://doi.org/10.3389/fmars.2022.981505 2023-01-15T01:24:49Z Mesoscale eddies are broadly distributed over the global ocean and play a significant role in modulating the spatiotemporal evolution of mixed layer depth (MLD). The presence of abnormal eddies in the ocean has been shown; however, the precise quantification of the effect of eddies on MLD, given the case of abnormal eddies, has not been carried out thus far. Differently from the previous approach to identify abnormal eddies through sea surface temperature, we therefore, proposed a method to identify abnormal eddies, using potential density based on Argo data (Array for Real-time Geostrophic Oceanography) for 15 years from 2003 to 2017. Results showed that abnormal anticyclonic eddies (AAE) and abnormal cyclonic eddies (ACE) accounted for 21.67% and 20.17% of total matching anticyclonic eddies (TAE) and the total matching cyclonic eddies (TCE), respectively, in the global ocean. The proportions of abnormal eddies were relatively higher in tropical regions but lower in regions with the boundary current and strong eddy kinetic energy. The MLD changes caused by normal and abnormal eddies were estimated combining satellite altimetry data. The normal eddies were the total matching eddies with the removal of the abnormal eddies, separately called normal anticyclonic eddies (NAE) and normal cyclonic eddies (NCE). The overall influence of NAE (NCE) was more significant on MLD deepening (uplifting) than that of TAE (TCE). Globally, NAE (NCE) changed MLD deepening (uplifting) from ~66 m (~54 m) to ~67 m (~53 m) and exhibited a more pronounced change in the Indian Ocean sector of the Southern Ocean region, from ~111 m (~94 m) to ~115 m (~92 m) in the winter. AAE (ACE), exerted a relatively weak but opposite effect on MLD deepening (uplifting). In other words, the global average MLD caused by them shoaled (deepened) from ~66 m (~54 m) to ~59 m (~59 m), and the North Pacific Ocean shoaled (deepened) from ~61 m (~47 m) to ~49 m (~57 m) in winter. Given the above results, abnormal eddies should be accounted for when the impact ... Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Indian Pacific Southern Ocean Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
mesoscale eddy oceanic mixed layer normal eddy abnormal eddy potential density anomaly Argo float Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
mesoscale eddy oceanic mixed layer normal eddy abnormal eddy potential density anomaly Argo float Science Q General. Including nature conservation geographical distribution QH1-199.5 Ji Hao Jie Yang Ge Chen The effect of normal and abnormal eddies on the mixed layer depth in the global ocean |
topic_facet |
mesoscale eddy oceanic mixed layer normal eddy abnormal eddy potential density anomaly Argo float Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Mesoscale eddies are broadly distributed over the global ocean and play a significant role in modulating the spatiotemporal evolution of mixed layer depth (MLD). The presence of abnormal eddies in the ocean has been shown; however, the precise quantification of the effect of eddies on MLD, given the case of abnormal eddies, has not been carried out thus far. Differently from the previous approach to identify abnormal eddies through sea surface temperature, we therefore, proposed a method to identify abnormal eddies, using potential density based on Argo data (Array for Real-time Geostrophic Oceanography) for 15 years from 2003 to 2017. Results showed that abnormal anticyclonic eddies (AAE) and abnormal cyclonic eddies (ACE) accounted for 21.67% and 20.17% of total matching anticyclonic eddies (TAE) and the total matching cyclonic eddies (TCE), respectively, in the global ocean. The proportions of abnormal eddies were relatively higher in tropical regions but lower in regions with the boundary current and strong eddy kinetic energy. The MLD changes caused by normal and abnormal eddies were estimated combining satellite altimetry data. The normal eddies were the total matching eddies with the removal of the abnormal eddies, separately called normal anticyclonic eddies (NAE) and normal cyclonic eddies (NCE). The overall influence of NAE (NCE) was more significant on MLD deepening (uplifting) than that of TAE (TCE). Globally, NAE (NCE) changed MLD deepening (uplifting) from ~66 m (~54 m) to ~67 m (~53 m) and exhibited a more pronounced change in the Indian Ocean sector of the Southern Ocean region, from ~111 m (~94 m) to ~115 m (~92 m) in the winter. AAE (ACE), exerted a relatively weak but opposite effect on MLD deepening (uplifting). In other words, the global average MLD caused by them shoaled (deepened) from ~66 m (~54 m) to ~59 m (~59 m), and the North Pacific Ocean shoaled (deepened) from ~61 m (~47 m) to ~49 m (~57 m) in winter. Given the above results, abnormal eddies should be accounted for when the impact ... |
format |
Article in Journal/Newspaper |
author |
Ji Hao Jie Yang Ge Chen |
author_facet |
Ji Hao Jie Yang Ge Chen |
author_sort |
Ji Hao |
title |
The effect of normal and abnormal eddies on the mixed layer depth in the global ocean |
title_short |
The effect of normal and abnormal eddies on the mixed layer depth in the global ocean |
title_full |
The effect of normal and abnormal eddies on the mixed layer depth in the global ocean |
title_fullStr |
The effect of normal and abnormal eddies on the mixed layer depth in the global ocean |
title_full_unstemmed |
The effect of normal and abnormal eddies on the mixed layer depth in the global ocean |
title_sort |
effect of normal and abnormal eddies on the mixed layer depth in the global ocean |
publisher |
Frontiers Media S.A. |
publishDate |
2023 |
url |
https://doi.org/10.3389/fmars.2022.981505 https://doaj.org/article/a050be11cfba4c839c746319ed72b0c4 |
geographic |
Indian Pacific Southern Ocean |
geographic_facet |
Indian Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Frontiers in Marine Science, Vol 9 (2023) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2022.981505/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.981505 https://doaj.org/article/a050be11cfba4c839c746319ed72b0c4 |
op_doi |
https://doi.org/10.3389/fmars.2022.981505 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
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1766207669955198976 |