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Variability of subduction rates of the subtropical North Pacific mode waters

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Variability of subduction rates of the subtropical North Pacific mode waters

Content Provider	Springer Nature Link
Author	Hu, Haibo Liu, Qinyu Zhang, Yuan Liu, Wei
Copyright Year	2011
Abstract	The climatology subduction rate for the entire Pacific is known, but the mechanism of interannual to decadal variation remains unclear. In this study, we calculated the annual subduction rates of three types of North Pacific subtropical mode waters using a general circulation model (LICOM1.0) for the period of 1958–2001. The model experiments focused on interannual variations of ocean dynamical processes under daily wind forcings and seasonal heat fluxes. The mode water formation region was defined by a potential vorticity minimum at outcrop locations. The model results show that two subduction rate maxima (>100 m/a) were located in the Subtropical Mode Water (STMW) and the Central Mode Water (CMW) formation regions. These regions are consistent with a climatologically calculated value. The subduction rate in the Eastern Subtropical Mode Water (ESTMW) formation region was smaller at about 75 m/a. The subduction rate shows clear interannual and decadal variations associated with oceanic dynamic variabilities. The average subduction rate of the STMW was much smaller during the period of 1981–1990 compared with other periods, while that of the CMW had a negative anomaly before 1975 and a positive anomaly after 1978. The variability agreed with Ekman and geostrophic advections and mixed layer depths. The interannual variability of the subduction rate for the ESTMW was smallest during 1970–1990, as a result of a weak wind stress curl. This paper explores how interannual signals from the atmosphere are stored in different parts of the ocean, and thus may contribute to a better understanding of feedback mechanisms for the Pacific Decadal Oscillation (PDO) event.
Starting Page	1131
Ending Page	1141
Page Count	11
File Format	PDF
ISSN	02544059
Journal	Chinese Journal of Oceanology and Limnology
Volume Number	29
Issue Number	5
e-ISSN	19935005
Language	English
Publisher	SP Science Press
Publisher Date	2011-08-08
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	subduction rate North Pacific subtropical mode water ocean modeling Oceanography
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Oceanography

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