Mesoscale eddy characteristics in the interior subtropical southeast Indian Ocean, tracked from the Leeuwin Current system
Two oppositely rotating mesoscale eddies, originating from the Leeuwin Current, were captured during a research cruise in the interior southeast Indian Ocean in August 2012, a few hundred kilometers off the west coast of Australia. The two eddies had different vertical structures: the anticyclonic e...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
---|---|
Main Authors: | , , , |
Format: | Report |
Language: | English |
Published: |
PERGAMON-ELSEVIER SCIENCE LTD
2019
|
Subjects: | |
Online Access: | http://ir.gig.ac.cn/handle/344008/50726 https://doi.org/10.1016/j.dsr2.2018.07.003 |
id |
ftchacadscgigcas:oai:ir.gig.ac.cn:344008/50726 |
---|---|
record_format |
openpolar |
spelling |
ftchacadscgigcas:oai:ir.gig.ac.cn:344008/50726 2023-05-15T17:35:05+02:00 Mesoscale eddy characteristics in the interior subtropical southeast Indian Ocean, tracked from the Leeuwin Current system Mao, Huabin Feng, Ming Phillips, Helen E. Lian, Shumin 2019-03-01 http://ir.gig.ac.cn/handle/344008/50726 https://doi.org/10.1016/j.dsr2.2018.07.003 英语 eng PERGAMON-ELSEVIER SCIENCE LTD DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY http://ir.gig.ac.cn/handle/344008/50726 doi:10.1016/j.dsr2.2018.07.003 Oceanography South Indian Ocean Leeuwin current Mesoscale eddies Eddy tracking NEAR-SURFACE CURRENTS INTERANNUAL VARIABILITY NORTH-ATLANTIC CHINA SEA EDDIES DYNAMICS IDENTIFICATION CHLOROPHYLL CIRCULATION DISPERSION 期刊论文 2019 ftchacadscgigcas https://doi.org/10.1016/j.dsr2.2018.07.003 2020-12-22T07:22:33Z Two oppositely rotating mesoscale eddies, originating from the Leeuwin Current, were captured during a research cruise in the interior southeast Indian Ocean in August 2012, a few hundred kilometers off the west coast of Australia. The two eddies had different vertical structures: the anticyclonic eddy had stronger vertical shear above 200 m and a less stratified thermocline below the mixed layer, while the cyclonic eddy had a more barotropic structure in the upper 500 m. Compared with the same types of eddies sampled in 2003 close to the Australian coast, the 2012 anticyclonic eddy had a larger radius, deeper isothermal depths, and higher peak velocity; whereas the 2012 cyclonic eddy had a similar structure with the 2003 survey. We use an Argo float and three surface drifters deployed and trapped in the anticyclonic eddy to track its evolution over a 4-month period. The eddy was observed to propagate 1000 km further to the west, indicating that the Leeuwin Current properties of the eddy may be preserved for over 2000 km off the west coast of Australia. The eddy appeared to have experienced radial excursions relative to the eddy center, with periodicity of 4-6 days and 15 days, during their anticlockwise motions. The radial movements of the drifters appeared to be constrained by the radial momentum balance within the eddy. The importance of eddy distortions to ocean primary production in anticyclonic eddies in the southeast Indian Ocean warrants further studies. Report North Atlantic Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) Indian Deep Sea Research Part II: Topical Studies in Oceanography 161 52 62 |
institution |
Open Polar |
collection |
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchacadscgigcas |
language |
English |
topic |
Oceanography South Indian Ocean Leeuwin current Mesoscale eddies Eddy tracking NEAR-SURFACE CURRENTS INTERANNUAL VARIABILITY NORTH-ATLANTIC CHINA SEA EDDIES DYNAMICS IDENTIFICATION CHLOROPHYLL CIRCULATION DISPERSION |
spellingShingle |
Oceanography South Indian Ocean Leeuwin current Mesoscale eddies Eddy tracking NEAR-SURFACE CURRENTS INTERANNUAL VARIABILITY NORTH-ATLANTIC CHINA SEA EDDIES DYNAMICS IDENTIFICATION CHLOROPHYLL CIRCULATION DISPERSION Mao, Huabin Feng, Ming Phillips, Helen E. Lian, Shumin Mesoscale eddy characteristics in the interior subtropical southeast Indian Ocean, tracked from the Leeuwin Current system |
topic_facet |
Oceanography South Indian Ocean Leeuwin current Mesoscale eddies Eddy tracking NEAR-SURFACE CURRENTS INTERANNUAL VARIABILITY NORTH-ATLANTIC CHINA SEA EDDIES DYNAMICS IDENTIFICATION CHLOROPHYLL CIRCULATION DISPERSION |
description |
Two oppositely rotating mesoscale eddies, originating from the Leeuwin Current, were captured during a research cruise in the interior southeast Indian Ocean in August 2012, a few hundred kilometers off the west coast of Australia. The two eddies had different vertical structures: the anticyclonic eddy had stronger vertical shear above 200 m and a less stratified thermocline below the mixed layer, while the cyclonic eddy had a more barotropic structure in the upper 500 m. Compared with the same types of eddies sampled in 2003 close to the Australian coast, the 2012 anticyclonic eddy had a larger radius, deeper isothermal depths, and higher peak velocity; whereas the 2012 cyclonic eddy had a similar structure with the 2003 survey. We use an Argo float and three surface drifters deployed and trapped in the anticyclonic eddy to track its evolution over a 4-month period. The eddy was observed to propagate 1000 km further to the west, indicating that the Leeuwin Current properties of the eddy may be preserved for over 2000 km off the west coast of Australia. The eddy appeared to have experienced radial excursions relative to the eddy center, with periodicity of 4-6 days and 15 days, during their anticlockwise motions. The radial movements of the drifters appeared to be constrained by the radial momentum balance within the eddy. The importance of eddy distortions to ocean primary production in anticyclonic eddies in the southeast Indian Ocean warrants further studies. |
format |
Report |
author |
Mao, Huabin Feng, Ming Phillips, Helen E. Lian, Shumin |
author_facet |
Mao, Huabin Feng, Ming Phillips, Helen E. Lian, Shumin |
author_sort |
Mao, Huabin |
title |
Mesoscale eddy characteristics in the interior subtropical southeast Indian Ocean, tracked from the Leeuwin Current system |
title_short |
Mesoscale eddy characteristics in the interior subtropical southeast Indian Ocean, tracked from the Leeuwin Current system |
title_full |
Mesoscale eddy characteristics in the interior subtropical southeast Indian Ocean, tracked from the Leeuwin Current system |
title_fullStr |
Mesoscale eddy characteristics in the interior subtropical southeast Indian Ocean, tracked from the Leeuwin Current system |
title_full_unstemmed |
Mesoscale eddy characteristics in the interior subtropical southeast Indian Ocean, tracked from the Leeuwin Current system |
title_sort |
mesoscale eddy characteristics in the interior subtropical southeast indian ocean, tracked from the leeuwin current system |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2019 |
url |
http://ir.gig.ac.cn/handle/344008/50726 https://doi.org/10.1016/j.dsr2.2018.07.003 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY http://ir.gig.ac.cn/handle/344008/50726 doi:10.1016/j.dsr2.2018.07.003 |
op_doi |
https://doi.org/10.1016/j.dsr2.2018.07.003 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
161 |
container_start_page |
52 |
op_container_end_page |
62 |
_version_ |
1766134126387134464 |