Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint
The origin and pathway of the thermostad water in the eastern equatorial Pacific Ocean, often referred to as the equatorial 13 degrees C Water, are investigated using a simulated passive tracer and its adjoint, based on circulation estimates of a global general circulation model. Results demonstrate...
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2009
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Online Access: | http://ir.qdio.ac.cn/handle/337002/1766 https://doi.org/10.1175/2009JPO4045.1 |
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/1765 2024-09-15T17:46:30+00:00 Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint Qu, Tangdong Gao, Shan Fukumori, Ichiro Fine, Rana A. Lindstrom, Eric J. Qu, TD, Univ Hawaii Manoa, IPRC SOEST, 1680 East West Rd, Honolulu, HI 96822 USA 2009-08-01 http://ir.qdio.ac.cn/handle/337002/1766 https://doi.org/10.1175/2009JPO4045.1 英语 eng JOURNAL OF PHYSICAL OCEANOGRAPHY Qu, Tangdong; Gao, Shan; Fukumori, Ichiro; Fine, Rana A.; Lindstrom, Eric J.Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint,JOURNAL OF PHYSICAL OCEANOGRAPHY,2009,39(8):1836-1853 http://ir.qdio.ac.cn/handle/337002/1766 doi:10.1175/2009JPO4045.1 Subtropical Mode Water South-pacific Ocean Circulation Subsurface Countercurrents Tropical Pacific Overturning Circulations Undercurrent Intermediate Climatology Thermocline Oceanography Article 期刊论文 2009 ftchinacasciocas https://doi.org/10.1175/2009JPO4045.1 2024-08-09T03:18:11Z The origin and pathway of the thermostad water in the eastern equatorial Pacific Ocean, often referred to as the equatorial 13 degrees C Water, are investigated using a simulated passive tracer and its adjoint, based on circulation estimates of a global general circulation model. Results demonstrate that the source region of the 13 degrees C Water lies well outside the tropics. In the South Pacific, some 13 degrees C Water is formed northeast of New Zealand, confirming an earlier hypothesis on the water's origin. The South Pacific origin of the 13 degrees C Water is also related to the formation of the Eastern Subtropical Mode Water (ESTMW) and the Sub-Antarctic Mode Water (SAMW). The portion of the ESTMW and SAMW that eventually enters the density range of the 13 degrees C Water (25.8 < sigma(theta) < 26.6 kg m(-3)) does so largely by mixing. Water formed in the subtropics enters the equatorial region predominantly through the western boundary, while its interior transport is relatively small. The fresher North Pacific ESTMW and Central Mode Water (CMW) are also important sources of the 13 degrees C Water. The ratio of the southern versus the northern origins of the water mass is about 2 to 1 and tends to increase with time elapsed from its origin. Of the total volume of initially tracer-tagged water in the eastern equatorial Pacific, approximately 47.5% originates from depths above sigma(theta) = 25.8 kg m(-3) and 34.6% from depths below sigma(theta) = 26.6 kg m(-3), indicative of a dramatic impact of mixing on the route of subtropical water to becoming the 13 degrees C Water. Still only a small portion of the water formed in the subtropics reaches the equatorial region, because most of the water is trapped and recirculates in the subtropical gyre. The origin and pathway of the thermostad water in the eastern equatorial Pacific Ocean, often referred to as the equatorial 13 degrees C Water, are investigated using a simulated passive tracer and its adjoint, based on circulation estimates of a global ... Article in Journal/Newspaper Antarc* Antarctic Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Journal of Physical Oceanography 39 8 1836 1853 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Subtropical Mode Water South-pacific Ocean Circulation Subsurface Countercurrents Tropical Pacific Overturning Circulations Undercurrent Intermediate Climatology Thermocline Oceanography |
spellingShingle |
Subtropical Mode Water South-pacific Ocean Circulation Subsurface Countercurrents Tropical Pacific Overturning Circulations Undercurrent Intermediate Climatology Thermocline Oceanography Qu, Tangdong Gao, Shan Fukumori, Ichiro Fine, Rana A. Lindstrom, Eric J. Qu, TD, Univ Hawaii Manoa, IPRC SOEST, 1680 East West Rd, Honolulu, HI 96822 USA Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint |
topic_facet |
Subtropical Mode Water South-pacific Ocean Circulation Subsurface Countercurrents Tropical Pacific Overturning Circulations Undercurrent Intermediate Climatology Thermocline Oceanography |
description |
The origin and pathway of the thermostad water in the eastern equatorial Pacific Ocean, often referred to as the equatorial 13 degrees C Water, are investigated using a simulated passive tracer and its adjoint, based on circulation estimates of a global general circulation model. Results demonstrate that the source region of the 13 degrees C Water lies well outside the tropics. In the South Pacific, some 13 degrees C Water is formed northeast of New Zealand, confirming an earlier hypothesis on the water's origin. The South Pacific origin of the 13 degrees C Water is also related to the formation of the Eastern Subtropical Mode Water (ESTMW) and the Sub-Antarctic Mode Water (SAMW). The portion of the ESTMW and SAMW that eventually enters the density range of the 13 degrees C Water (25.8 < sigma(theta) < 26.6 kg m(-3)) does so largely by mixing. Water formed in the subtropics enters the equatorial region predominantly through the western boundary, while its interior transport is relatively small. The fresher North Pacific ESTMW and Central Mode Water (CMW) are also important sources of the 13 degrees C Water. The ratio of the southern versus the northern origins of the water mass is about 2 to 1 and tends to increase with time elapsed from its origin. Of the total volume of initially tracer-tagged water in the eastern equatorial Pacific, approximately 47.5% originates from depths above sigma(theta) = 25.8 kg m(-3) and 34.6% from depths below sigma(theta) = 26.6 kg m(-3), indicative of a dramatic impact of mixing on the route of subtropical water to becoming the 13 degrees C Water. Still only a small portion of the water formed in the subtropics reaches the equatorial region, because most of the water is trapped and recirculates in the subtropical gyre. The origin and pathway of the thermostad water in the eastern equatorial Pacific Ocean, often referred to as the equatorial 13 degrees C Water, are investigated using a simulated passive tracer and its adjoint, based on circulation estimates of a global ... |
format |
Article in Journal/Newspaper |
author |
Qu, Tangdong Gao, Shan Fukumori, Ichiro Fine, Rana A. Lindstrom, Eric J. Qu, TD, Univ Hawaii Manoa, IPRC SOEST, 1680 East West Rd, Honolulu, HI 96822 USA |
author_facet |
Qu, Tangdong Gao, Shan Fukumori, Ichiro Fine, Rana A. Lindstrom, Eric J. Qu, TD, Univ Hawaii Manoa, IPRC SOEST, 1680 East West Rd, Honolulu, HI 96822 USA |
author_sort |
Qu, Tangdong |
title |
Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint |
title_short |
Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint |
title_full |
Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint |
title_fullStr |
Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint |
title_full_unstemmed |
Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint |
title_sort |
origin and pathway of equatorial 13 degrees c water in the pacific identified by a simulated passive tracer and its adjoint |
publishDate |
2009 |
url |
http://ir.qdio.ac.cn/handle/337002/1766 https://doi.org/10.1175/2009JPO4045.1 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
JOURNAL OF PHYSICAL OCEANOGRAPHY Qu, Tangdong; Gao, Shan; Fukumori, Ichiro; Fine, Rana A.; Lindstrom, Eric J.Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint,JOURNAL OF PHYSICAL OCEANOGRAPHY,2009,39(8):1836-1853 http://ir.qdio.ac.cn/handle/337002/1766 doi:10.1175/2009JPO4045.1 |
op_doi |
https://doi.org/10.1175/2009JPO4045.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
39 |
container_issue |
8 |
container_start_page |
1836 |
op_container_end_page |
1853 |
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1810494704494575616 |