Intermediate and deep water formation in the Okinawa Trough SCIE SCOPUS

Cited 42 time in WEB OF SCIENCE Cited 43 time in Scopus
Title
Intermediate and deep water formation in the Okinawa Trough
Author(s)
Nakamura, Hirohiko; Nishina, Ayako; Liu, Zhaojun; Tanaka, Fumiyo; Wimbush, Mark; Park, Jae-Hun
Alternative Author(s)
박재훈
Publication Year
2013-12
Abstract
Water mass formation in the intermediate and deep layers of the Okinawa Trough is investigated using two distinct data sets: a quasi-climatological data set of the water properties of the minimum salinity surface produced from Argo float profiles and historical CTD data, and a velocity data set in the Kerama Gap measured by moored current meters during June 2009 to June 2011. The formation process of Okinawa Trough Intermediate Water is explained on the basis of horizontal advection and mixing of North Pacific Intermediate Water (NPIW) and South China Sea Intermediate Water (SCSIW). The salinity-minimum water intruding into the Okinawa Trough through the channel east of Taiwan is approximately composed of 45% NPIW and 55% SCSIW, while that through the Kerama Gap is 75% NPIW and 25% SCSIW. Salinities of these water masses increase in the Okinawa Trough due to strong diapycnal diffusion; its coefficient is estimated as 6.8-21.5 x 10(-4) m(2) s(-1) based on a simple advection-diffusion equation. On the other hand, deep water in the Okinawa Trough, below the sill depth of the Kerama Gap (approximate to 1100 m), is ventilated by overflow in the bottom layer of the Kerama Gap down to the deepest layer (approximate to 2000 m) in the southern Okinawa Trough. A simple box model predicts that this bottom overflow (0.18-0.35 Sv) causes strong upwelling (3.8-7.6 x 10(-6) m s(-1)) in the southern Okinawa Trough, which must be maintained by buoyancy gain of the deep water due to strong diapycnal diffusion (4.8-9.5 x 10(-4) m(2) s(-1)).
ISSN
0148-0227
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3056
DOI
10.1002/2013JC009326
Bibliographic Citation
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, v.118, no.12, pp.6881 - 6893, 2013
Publisher
AMER GEOPHYSICAL UNION
Keywords
Okinawa Trough; Kerama Gap; North Pacific Intermediate Water; Ryukyu Current System; deep ventilation; hydraulic control
Type
Article
Language
English
Document Type
Article
Publisher
AMER GEOPHYSICAL UNION
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