Driving forces of interleaving in the baroclinic front at the Equator SCIE SCOPUS

Cited 3 time in WEB OF SCIENCE Cited 3 time in Scopus
Title
Driving forces of interleaving in the baroclinic front at the Equator
Author(s)
Kuzmina, N; Lee, JH
KIOST Author(s)
Lee, Jae Hak(이재학)
Publication Year
2005-12
Abstract
The different types of instability in the equatorial beta-plane approximation are analyzed by means of a 2D linear stability problem. The double-diffusive (DD) and diffusive/baroclinic (2D baroclinic and McIntyre) instabilities are shown not to develop if contours of the mean salinity/density have a parabolic, symmetrical-relative-to-the- equator shape. Using modeling results, an illustrative scheme of Equatorial Undercurrent (EUC) regions where different types of instability can develop is presented and subsequently applied to understand the driving forces of the intrusions observed in a closed spaced CTD section, located between the equator and 1 degrees N. Long coherence intrusions are situated within two isopycnal layers, aligned to 25 (layer 1) and 26.3 (layer 2) sigma(T), where the vertical shear is low. It was shown from the model that the layer-1 intrusions being observed in the midlayer of the EUC where the mean horizontal gradient of salinity is approximately constant are likely generated by a combined effect of DD instability and instability due to linear horizontal shear. The layer-2 intrusions being observed in the lower part of EUC where the mean salinity contours have a parabolic shape likely arise because of linear horizontal shear only, while double diffusion can be considered as an effect that increases the growth rate of unstable modes. Special attention is focused on two different parts of the EUC in the mixing of the thermocline. It is noted that the EUC only makes the mass transfer by long coherence intrusions in certain layers where the vertical shear is small. Conversely, the EUC contributes to the growth rate of unstable modes due to the horizontal linear shear.
ISSN
0022-3670
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5002
DOI
10.1175/JPO2828.1
Bibliographic Citation
JOURNAL OF PHYSICAL OCEANOGRAPHY, v.35, no.12, pp.2501 - 2519, 2005
Publisher
AMER METEOROLOGICAL SOC
Subject
FINE-STRUCTURE; PACIFIC-OCEAN; TURBULENCE; VARIABILITY; INTRUSIONS
Type
Article
Language
English
Document Type
Article
Publisher
AMER METEOROLOGICAL SOC
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