Mindanao Current/Undercurrent in an eddy-resolving GCM
Analysis of results from an eddy-resolving general circulation model showed two subsurface velocity cores in the mean within the depth range between 400 and 1000 m below the Mindanao Current (MC). One is confined to the inshore edge at about 126.8 degrees E and connected with the Sulawesi Sea. The o...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | http://ir.qdio.ac.cn/handle/337002/12170 https://doi.org/10.1029/2011JC007838 |
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/12170 2023-05-15T13:40:36+02:00 Mindanao Current/Undercurrent in an eddy-resolving GCM Qu, Tangdong Chiang, Tzu-Ling Wu, Chau-Ron Dutrieux, Pierre Hu, Dunxin Qu, TD (reprint author), Univ Hawaii Manoa, Int Pacific Res Ctr, SOEST, 1680 East West Rd, Honolulu, HI 96822 USA. 2012-06-29 http://ir.qdio.ac.cn/handle/337002/12170 https://doi.org/10.1029/2011JC007838 英语 eng JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Qu, Tangdong; Chiang, TzuLing; Wu, ChauRon; Dutrieux, Pierre; Hu, Dunxin.Mindanao Current/Undercurrent in an eddy-resolving GCM,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2012,117():C06026 http://ir.qdio.ac.cn/handle/337002/12170 doi:10.1029/2011JC007838 North Equatorial Current Antarctic Intermediate Water Pacific-ocean Circulation Western Boundary Currents Indonesian Throughflow Tropical Pacific Kuroshio East Current Bifurcation Mesoscale Eddies Philippine Coast Oceanography Article 期刊论文 2012 ftchinacasciocas https://doi.org/10.1029/2011JC007838 2022-06-27T05:34:23Z Analysis of results from an eddy-resolving general circulation model showed two subsurface velocity cores in the mean within the depth range between 400 and 1000 m below the Mindanao Current (MC). One is confined to the inshore edge at about 126.8 degrees E and connected with the Sulawesi Sea. The other takes place somewhat offshore around 127.7 degrees E, being closely related to the intrusion of South Pacific water. Both cores are referred to as the Mindanao Undercurrent (MUC). The MC/MUC is approximately a geostrophic flow, except on the inshore edge of the MUC where up to 50% of the mean flow can be explained by ageostrophic dynamics. In contrast with the well-defined southward flowing MC, the MUC is of high velocity variance relative to the mean. Empirical orthogonal function (EOF) analysis shows that approximately 60% of the total velocity variance is associated with two meandering modes, with their major signatures in the subthermocline. The dominant time scale of variability is 50-100 days. An ensemble of these meso-scale fluctuations provides a northward freshwater flux on the offshore edge of the Philippine coast, which to a certain extent explains why water of South Pacific origin appears to extend farther northward than the mean MUC. In the offshore velocity core of the MUC, for example, eddy induced freshwater flux is equivalent to a mean flow of about 0.3 m s(-1) in the density range between 26.9 and 27.3 kg m(-3), which is greater than the mean current by a factor of 6. Article in Journal/Newspaper Antarc* Antarctic Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Antarctic Pacific Journal of Geophysical Research: Oceans 117 C6 n/a n/a |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
North Equatorial Current Antarctic Intermediate Water Pacific-ocean Circulation Western Boundary Currents Indonesian Throughflow Tropical Pacific Kuroshio East Current Bifurcation Mesoscale Eddies Philippine Coast Oceanography |
spellingShingle |
North Equatorial Current Antarctic Intermediate Water Pacific-ocean Circulation Western Boundary Currents Indonesian Throughflow Tropical Pacific Kuroshio East Current Bifurcation Mesoscale Eddies Philippine Coast Oceanography Qu, Tangdong Chiang, Tzu-Ling Wu, Chau-Ron Dutrieux, Pierre Hu, Dunxin Qu, TD (reprint author), Univ Hawaii Manoa, Int Pacific Res Ctr, SOEST, 1680 East West Rd, Honolulu, HI 96822 USA. Mindanao Current/Undercurrent in an eddy-resolving GCM |
topic_facet |
North Equatorial Current Antarctic Intermediate Water Pacific-ocean Circulation Western Boundary Currents Indonesian Throughflow Tropical Pacific Kuroshio East Current Bifurcation Mesoscale Eddies Philippine Coast Oceanography |
description |
Analysis of results from an eddy-resolving general circulation model showed two subsurface velocity cores in the mean within the depth range between 400 and 1000 m below the Mindanao Current (MC). One is confined to the inshore edge at about 126.8 degrees E and connected with the Sulawesi Sea. The other takes place somewhat offshore around 127.7 degrees E, being closely related to the intrusion of South Pacific water. Both cores are referred to as the Mindanao Undercurrent (MUC). The MC/MUC is approximately a geostrophic flow, except on the inshore edge of the MUC where up to 50% of the mean flow can be explained by ageostrophic dynamics. In contrast with the well-defined southward flowing MC, the MUC is of high velocity variance relative to the mean. Empirical orthogonal function (EOF) analysis shows that approximately 60% of the total velocity variance is associated with two meandering modes, with their major signatures in the subthermocline. The dominant time scale of variability is 50-100 days. An ensemble of these meso-scale fluctuations provides a northward freshwater flux on the offshore edge of the Philippine coast, which to a certain extent explains why water of South Pacific origin appears to extend farther northward than the mean MUC. In the offshore velocity core of the MUC, for example, eddy induced freshwater flux is equivalent to a mean flow of about 0.3 m s(-1) in the density range between 26.9 and 27.3 kg m(-3), which is greater than the mean current by a factor of 6. |
format |
Article in Journal/Newspaper |
author |
Qu, Tangdong Chiang, Tzu-Ling Wu, Chau-Ron Dutrieux, Pierre Hu, Dunxin Qu, TD (reprint author), Univ Hawaii Manoa, Int Pacific Res Ctr, SOEST, 1680 East West Rd, Honolulu, HI 96822 USA. |
author_facet |
Qu, Tangdong Chiang, Tzu-Ling Wu, Chau-Ron Dutrieux, Pierre Hu, Dunxin Qu, TD (reprint author), Univ Hawaii Manoa, Int Pacific Res Ctr, SOEST, 1680 East West Rd, Honolulu, HI 96822 USA. |
author_sort |
Qu, Tangdong |
title |
Mindanao Current/Undercurrent in an eddy-resolving GCM |
title_short |
Mindanao Current/Undercurrent in an eddy-resolving GCM |
title_full |
Mindanao Current/Undercurrent in an eddy-resolving GCM |
title_fullStr |
Mindanao Current/Undercurrent in an eddy-resolving GCM |
title_full_unstemmed |
Mindanao Current/Undercurrent in an eddy-resolving GCM |
title_sort |
mindanao current/undercurrent in an eddy-resolving gcm |
publishDate |
2012 |
url |
http://ir.qdio.ac.cn/handle/337002/12170 https://doi.org/10.1029/2011JC007838 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Qu, Tangdong; Chiang, TzuLing; Wu, ChauRon; Dutrieux, Pierre; Hu, Dunxin.Mindanao Current/Undercurrent in an eddy-resolving GCM,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2012,117():C06026 http://ir.qdio.ac.cn/handle/337002/12170 doi:10.1029/2011JC007838 |
op_doi |
https://doi.org/10.1029/2011JC007838 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
117 |
container_issue |
C6 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766137509519032320 |