https://repository.kopri.re.kr/handle/201206/13393 2026-04-25T13:22:55Z https://repository.kopri.re.kr/handle/201206/15261 Title: Development of Integrated Health Management System for Polar Operation Ships and Offshore Structures Based on Satellite Data Authors: Kim, Hyun-cheol 2022-12-31T00:00:00Z https://repository.kopri.re.kr/handle/201206/14134 Title: The Estimation of the Total Freeboard of Arctic Sea Ice in Winter Using Passive Microwave Satellite Measurements Authors: 김종민; 손병주; 이상무; 시호연; Kwon, Young-Joo; 김상우; Kim, Hyun-cheol Abstract: A method to estimating the total freeboard, hf , of the sea ice in the Arctic basin was developed in this study. To utilize the dielectric properties of microwave measurements on the sea ice freeboard, we adopted the spectral difference between the microwave frequencies (e.g., the gradient ratio). Satellite lidar altimetry data was utilized as a reference, and two pairs of gradient ratios [GR(36.5,18.7) and GR(10.7,6.9)] and an optional brightness temperature for first-year ice [that is, TB H (6.9)] were converted from passive microwave sensors into h f using the multiple linear regression equation. Using this method, we estimated h f without direct altimetry measurements. The developed method was evaluated using Operation IceBridge data and the relationship between the regressed h f and Operation IceBridge h f had a correlation coefficient R of 0.761 and a nearly unbiased (approximately -0.4 cm) pattern. Because passive microwave measurements are taken in the Arctic daily, the approach presented in this study has the potential to enable daily h f estimations for the Arctic 2022-01-01T00:00:00Z