동해 순환모델에 대한 3차원변분동화기법의 적용

Title
동해 순환모델에 대한 3차원변분동화기법의 적용
Alternative Title
Implementation of the 3-dimensional variational assimilation scheme to the East/Japan Sea Regional Ocean Model
Author(s)
김영호; 장경일; 박종진; 박선기; 이상현; 김영규; 정경태
Publication Year
2008-06-16
Abstract
Recently, we have assimilated satellite-borne sea surface temperature and sea surface height data, and temperature profiles into the East/Japan Sea Regional Ocean Model (DA-ESROM) from 1993 to 2002 using a 3-dimensional variational data assimilation scheme. Comparing with the results from Mitchell et al. (2005), the DA-ESROM fairly well simulates the high variability of the Ulleung Warm Eddy and Dok Cold Eddy as well as the branching of the Tsushima Warm Current in the UB. The overall root-mean-square error between 100m temperature field reproduced by the DA-ESROM and the observed 100-dbar temperature field is 2.1 C, and the spatially averaged grid-to-grid correlation between the two temperature fields is high with a mean value of 0.79 for the inter-comparison period. Analyzing the results of the DA-ESROM, we have investigated spatial and temporal variability of the North Korean Cold Current (NKCC) in the East/Japan Sea. The monthly mean transport of the NKCC shows a clear seasonal variation with a range of about 0.35 Sv (=106m3/s), which increases from its minimum (about 0.45 Sv) through December-January to March, decreases from March to May, and then increases again to the maximum (about 0.8 Sv) in August-September. Interannual variation of the NKCC , however, is lager than the seasonal variation with a range of about 1.0 Sv. Model results show that the NKCC carries the North Korean Cold Water (NKCW) southward through the two different paths along the Korean coast and along 130°E.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/29893
Bibliographic Citation
5th Annual Meeting of AOGS, 2008
Publisher
Asia Oceania Geosciences Society
Type
Conference
Language
English
Publisher
Asia Oceania Geosciences Society
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