정지궤도위성을 사용한 아중간규모 난류관측

Title
정지궤도위성을 사용한 아중간규모 난류관측
Alternative Title
Observations of submesoscale turbulence using geostationary satellite images
Author(s)
최준명; 박영규; 김원국
KIOST Author(s)
Park, Young Gyu(박영규)
Publication Year
2020-02-18
Abstract
Near-surface observations of submesoscale circulations play a crucial role in understanding physical/biological processes in the upper open oceans, but current Eulerian observational platforms such as satellite altimetry and HR radar have limitations in resolution and coverage area. In this work, we introduce a way of studying submesoscale turbulence over an area of few hundred kilometers using Eulerian velocity observations. Geostationary satellite-based observations have extended the spatiotemporal scales down to submesoscales, at which local dispersion, ageostrophic circulation, vertical transport, and physical/biological interaction strongly occur. The movement of Chlorophyll-a distributions taken from theGeostationary Ocean Color Imager (GOCI) was processed by the method of Particle Image Velocimetry (PIV), from which we generated a submesoscale-permitting Eulerian velocity field around the Korea peninsula. The observations in the East/Japan Sea in April indicated two spectral regimes following k^-3 and k^-5/3 at scales larger and smaller than 50km, respectively. The spectral kink may represent a superposition of quasi-geostrophic (GQ) turbulence and surface quasi-geostrophic turbulence in an additive way, indicating a phase of increasing dominance of a QG flow in April.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/21011
Bibliographic Citation
Ocean Science Meeting 2020, 2020
Publisher
AGU
Type
Conference
Publisher
AGU
Related Researcher
Research Interests

ocean circulation,ocean mixing,marine debris,해양순환,해양혼합,해양부유물

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