https://repository.kopri.re.kr/handle/201206/11556 2026-04-21T11:51:27Z 2026-04-21T11:51:27Z Selley, Heather L. Hogg, Anna E. Cornford, Stephen Dutrieux, Pierre Shepherd, Andrew Wuite, Jan Floricioiu, Dana Kusk, Anders Nagler, Thomas Gilbert, Lin Slater, Thomas Kim, Tae-Wan https://repository.kopri.re.kr/handle/201206/13546 2022-07-06T07:49:53Z 2021-02-23T00:00:00Z

Title: Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018 Authors: Selley, Heather L.; Hogg, Anna E.; Cornford, Stephen; Dutrieux, Pierre; Shepherd, Andrew; Wuite, Jan; Floricioiu, Dana; Kusk, Anders; Nagler, Thomas; Gilbert, Lin; Slater, Thomas; Kim, Tae-Wan Abstract: The Getz region of West Antarctica is losing ice at an increasing rate; however, the forcing mechanisms remain unclear. Here we use satellite observations and an ice sheet model to measure the change in ice speed and mass balance of the drainage basin over the last 25-years. Our results show a mean increase in speed of 23.8 % between 1994 and 2018, with three glaciers accelerating by over 44 %. Speedup across the Getz basin is linear, with speedup and thinning directly correlated confirming the presence of dynamic imbalance. Since 1994, 315 Gt of ice has been lost contributing 0.90.6mm global mean sea level, with increased loss since 2010 caused by a snowfall reduction. Overall, dynamic imbalance accounts for two thirds of the mass loss from this region of West Antarctica over the past 25-years, with a longer-term response to ocean forcing the likely driving mechanism. The Getz region of West Antarctica is losing ice at an increasing rate; however, the forcing mechanisms remain unclear. Here we show for the first time that since 1994, widespread speedup has occurred on the majority of glaciers in the Getz drainage basin, with some glaciers speeding up by over 44 %.

2021-02-23T00:00:00Z Jung, Jinyoung Hong, Sang-Bum Chen, Meilian Hur, Jin Jiao, Liping Lee, Youngju Park, Keyhong Hahm, Doshik Choi, Jung-Ok Yang, Eun Jin Park, Jisoo Kim, Tae-Wan Lee, SangHoon https://repository.kopri.re.kr/handle/201206/11969 2022-03-24T07:15:15Z 2020-05-01T00:00:00Z

Title: Characteristics of methanesulfonic acid, non-sea-salt sulfate and organic carbon aerosols over the Amundsen Sea, Antarctica Authors: Jung, Jinyoung; Hong, Sang-Bum; Chen, Meilian; Hur, Jin; Jiao, Liping; Lee, Youngju; Park, Keyhong; Hahm, Doshik; Choi, Jung-Ok; Yang, Eun Jin; Park, Jisoo; Kim, Tae-Wan; Lee, SangHoon Abstract: To investigate the characteristics of particulate methanesulfonic acid (MSA((p))), non-sea-salt sulfate (nss SO42-) and organic carbon (OC) aerosols, aerosol and seawater samples were collected over the Southern Ocean (43-70 degrees S) and the Amundsen Sea (70-75 degrees S) during the ANA06B cruise conducted in the austral summer of 2016 aboard the Korean icebreaker IBR/V Araon. Over the Southern Ocean, the atmospheric MSA((p)) concentration was low (0.10 +/- 0.002 mu g m(-3)), whereas its concentration increased sharply up to 0.57 mu g m(-3) in the Amundsen Sea where Phaeocystis antarctica (P. antarctica), a producer of dimethylsulfide (DMS), was the dominant phytoplankton species. Unlike MSA((p)), the mean nss SO42- concentration in the Amundsen Sea was comparable to that in the Southern Ocean. Water-soluble organic carbon (WSOC) concentrations over the Southern Ocean and the Amundsen Sea varied from 0.048 to 0.16 and 0.070 to 0.18 mu gC m(-3), with averages of 0.087 +/- 0.038 and 0.097 +/- 0.038 mu gC m(-3), respectively. For water-insoluble organic carbon (WIOC), its mean concentrations over the Southern Ocean and the Amundsen Sea were 0.25 +/- 0.13 and 0.26 +/- 0.10 mu gC m(-3), varying from 0.083 to 0.49 and 0.12 to 0.38 mu gC m(-3), respectively. WIOC was the dominant organic carbon species in both the Southern Ocean and the Amundsen Sea, accounting for 73 %-75 % of the total aerosol organic carbon. WSOC/Na+ and WIOC/Na+ ratios in the fine-mode aerosol particles were higher, especially in the Amundsen Sea where biological productivity was much higher than the Southern Ocean. The fluorescence properties of water-soluble organic aerosols investigated using a fluorescence excitation-emission matrix coupled with parallel factor analysis (EEM-PARAFAC) revealed that protein-like components were dominant in our marine aerosol samples, representing 69 %-91 % of the total intensity. Protein-like components also showed a significant positive relationship with the relative biomass of diatoms; however, they were negatively correlated with the relative biomass of P. antarctica. These results suggest that the protein-like component is most likely produced as a result of biological processes of diatoms in the Amundsen Sea.

2020-05-01T00:00:00Z