The characteristics of physical oceanographic environments and bottom currents in the KODOS study area of the northeastern tropical Pacific SCOPUS KCI

Title
The characteristics of physical oceanographic environments and bottom currents in the KODOS study area of the northeastern tropical Pacific
Author(s)
Shin, H.-R.; Hwang, S.-C.; Jeon, D.; Kim, K.-H.; Kwak, C.-H.; So, S.-S.
Publication Year
2004
Abstract
Hyrdography and deep currents were measured from 1997 to 1999 to investigate deep-sea environments in the KODOS (Korea Deep Ocean Study) area of the northeastern tropical Pacific. KODOS area is located meridionally from the North Equatorial Current to the boundary between the North Equatorial Current and the Equatorial Counter Current. Strong thermocline exists between 10 m and 120 m depths at the study area. Since that strong thermocline does hardly allow vertical mixing between surface and lower layer waters, vertical distributions of temperature, salinity, dissolved oxygen and nutrients drastically change near the thermocline. Salinity-minimum layer, which indicate the North Pacific Intermediate Water (NPIW) and the Antartic Intermediate Water (AAIW), vertically occupies vertically at the depths from 500 m down to 1400 m. The NPIW and the AAIW horizontally occur to the north and to the south of 7°N, respectively. The near-bottom water shows the physical characteristics of 1.05°C and 34.70 psu at the depths of 10 m to 110 m above the bottom (approximately 4000-5000 m), which was originated from the Antarctic Circumpolar Water. It flows northeastwards for 2 to 4 months at the study area, and its mean velocity was 3.1-3.7 cm/s. Meanwhile, reverse (southwestward) currents appear for about 15 days with the average of 1.0-6.1 cm/s every 1 to 6 months. Dominant direction of the bottom currents obtained from the data for more than 6 months is northeastward with the average speeds of 1.7-2.1 cm/s. Therefore, it seems that deep waters from the Antarctica flow northwards passing through the KODOS area in the northeastern tropical Pacific.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5341
DOI
10.4217/OPR.2004.26.2.341
Bibliographic Citation
Ocean and Polar Research, v.26, no.2, pp.341 - 349, 2004
Publisher
Korea Ocean Research and Development Institute
Subject
Antarctic Intermediate Water; bottom current; countercurrent; deep water; mixing; salinity; thermocline; Antarctic Circumpolar Current; Pacific Ocean; Pacific Ocean (Tropical); Southern Ocean
Keywords
Deep waters; KODOS; The Antarctic Circumpolar Water; The Equatorial Counter Current; The North Equatorial Current; Thermocline
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
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