https://repository.kopri.re.kr/handle/201206/12729 2026-04-19T16:22:29Z 2026-04-19T16:22:29Z Lee, Sang-Moo Sohn, Byung-Ju Kim, Seong-Joong https://repository.kopri.re.kr/handle/201206/13020 2022-03-24T07:15:01Z 2017-05-27T00:00:00Z

Title: Differentiating between first-year and multiyear sea ice in the Arctic using microwave-retrieved ice emissivities Authors: Lee, Sang-Moo; Sohn, Byung-Ju; Kim, Seong-Joong Abstract: Polarized emissivities of the sea ice over the Arctic were retrieved at Advanced Microwave Scanning RadiometerEOS 10.65, 18.7, 23.8, and 36.5 GHz channel frequencies. Results indicate that retrieved emissivities are consistent with other emissivity estimates. However, errors in the retrieved emissivity for multiyear sea ice at 23.8 and 36.5 GHz can be large up to 8% and 20%, respectively, because of ignoring the freeboard ice scattering and the use of the same emission layer as in 6.925 GHz. It is shown that the emissivity slope for first-year ice between 10.65 and 18.7 GHz is opposite to that for multiyear sea ice, enabling a distinction between first-year ice and multiyear ice. Using these differences in spectral features with ice types, an emissivity difference (vertically polarized emissivity difference between 10.65 and 18.7 GHz) was devised to differentiate between first-year sea ice and multiyear sea ice. A comparison with the ice status information obtained from Cold Regions Research and Engineering Laboratory buoy measurements demonstrates that the method can separate first-year ice from multiyear ice, implying that this technique enables us to obtain instantaneous and pixel-level ice-type information from space-based passive microwave measurements.

2017-05-27T00:00:00Z 윤환수 https://repository.kopri.re.kr/handle/201206/13129 2022-03-24T07:14:31Z 2016-08-04T00:00:00Z

Title: Evolutionary Time Machine: A case study of sediment core sample from Larsen-C ice shelf in the Antarctica Authors: 윤환수

2016-08-04T00:00:00Z Belt, S. T. Smik, L. Brown, A. Kim, J. -H. Rowland, S. J. Allen, C. S. Gal, J. -K. Shin, K. -H. Lee, Jae Il Taylor, K. W. R. https://repository.kopri.re.kr/handle/201206/13014 2022-03-24T07:14:09Z 2016-08-01T00:00:00Z

Title: Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25 Authors: Belt, S. T.; Smik, L.; Brown, A.; Kim, J. -H.; Rowland, S. J.; Allen, C. S.; Gal, J. -K.; Shin, K. -H.; Lee, Jae Il; Taylor, K. W. R. Abstract: The presence of a di-unsaturated highly branched isoprenoid (HBI) lipid biomarker (diene II) in Southern Ocean sediments has previously been proposed as a proxy measure of palaeo Antarctic sea ice. Here we show that a source of diene II is the sympagic diatom Berkeleya adeliensis Medlin. Furthermore, the propensity for B. adeliensis to flourish in platelet ice is reflected by an offshore downward gradient in diene II concentration in 4100 surface sediments from Antarctic coastal and near-coastal environments. Since platelet ice formation is strongly associated with super-cooled freshwater inflow, we further hypothesize that sedimentary diene II provides a potentially sensitive proxy indicator of landfast sea ice influenced by meltwater discharge from nearby glaciers and ice shelves, and re-examination of some previous diene II downcore records supports this hypothesis. The term IPSO25―Ice Proxy for the Southern Ocean with 25 carbon atoms―is proposed as a proxy name for diene II.

2016-08-01T00:00:00Z Sohn, Byung-Ju https://repository.kopri.re.kr/handle/201206/13101 2022-03-24T07:14:59Z 2016-07-31T00:00:00Z

Title: Monitoring of the Antarctic ice sheet temperature changes using satellite microwave sensing Authors: Sohn, Byung-Ju

2016-07-31T00:00:00Z