Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint

doi:10.1175/2009JPO4045.1

IOCAS-IR > 海洋环流与波动重点实验室

	Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint
	Qu, Tangdong 1; Gao, Shan 1,2; Fukumori, Ichiro 3; Fine, Rana A.4; Lindstrom, Eric J.5; Qu, TD, Univ Hawaii Manoa, IPRC SOEST, 1680 East West Rd, Honolulu, HI 96822 USA
	2009-08-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	39 期号:8 页码:1836-1853
文章类型	Article
摘要	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 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.
关键词	Subtropical Mode Water South-pacific Ocean Circulation Subsurface Countercurrents Tropical Pacific Overturning Circulations Undercurrent Intermediate Climatology Thermocline
学科领域	Oceanography
DOI	10.1175/2009JPO4045.1
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000269263100005
引用统计	被引频次：41[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/1765
专题	海洋环流与波动重点实验室
通讯作者	Qu, TD, Univ Hawaii Manoa, IPRC SOEST, 1680 East West Rd, Honolulu, HI 96822 USA
作者单位	1.Univ Hawaii Manoa, IPRC SOEST, Honolulu, HI 96822 USA 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 3.CALTECH, Jet Prop Lab, Pasadena, CA USA 4.Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Miami, FL 33149 USA 5.NASA, Sci Mission Directorate, Washington, DC 20546 USA
推荐引用方式 GB/T 7714	Qu, Tangdong,Gao, Shan,Fukumori, Ichiro,et al. Origin and Pathway of Equatorial 13 degrees C Water in the Pacific Identified by a Simulated Passive Tracer and Its Adjoint[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2009,39(8):1836-1853.
APA	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).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,39(8),1836-1853.
MLA	Qu, Tangdong,et al."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 39.8(2009):1836-1853.

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