https://repository.kopri.re.kr/handle/201206/11547 2026-04-23T06:21:52Z 2026-04-23T06:21:52Z Kim, Songkang Park, Sang-Jong Lee, Hana Ahn, Dha Hyun Jung, Yeonjin Choi, Taejin Lee, Bang Yong Kim, Seong-Joong Koo, Ja-Ho https://repository.kopri.re.kr/handle/201206/13627 2022-07-08T00:12:14Z 2021-04-01T00:00:00Z

Title: Evaluation of Total Ozone Column from Multiple Satellite Measurements in the Antarctic Using the Brewer Spectrophotometer Authors: Kim, Songkang; Park, Sang-Jong; Lee, Hana; Ahn, Dha Hyun; Jung, Yeonjin; Choi, Taejin; Lee, Bang Yong; Kim, Seong-Joong; Koo, Ja-Ho Abstract: The ground-based ozone observation instrument, Brewer spectrophotometer (Brewer), was used to evaluate the quality of the total ozone column (TOC) produced by multiple polar-orbit satellite measurements at three stations in Antarctica (King Sejong, Jang Bogo, and Zhongshan stations). While all satellite TOCs showed high correlations with Brewer TOCs (R = ~0.8 to 0.9), there are some TOC differences among satellite data in austral spring, which is mainly attributed to the bias of Atmospheric Infrared Sounder (AIRS) TOC. The quality of satellite TOCs is consistent between Level 2 and 3 data, implying that “which satellite TOC is used” can induce larger uncertainty than “which spatial resolution is used” for the investigation of the Antarctic TOC pattern. Additionally, the quality of satellite TOC is regionally different (e.g., OMI TOC is a little higher at the King Sejong station, but lower at the Zhongshan station than the Brewer TOC). Thus, it seems necessary to consider the difference of multiple satellite data for better assessing the spatiotemporal pattern of Antarctic TOC.

2021-04-01T00:00:00Z Azhar, Siti Syairah Atiqah Chenoli, Sheeba Nettukandy Abu Samah, Azizan Kim, Seong-Joong https://repository.kopri.re.kr/handle/201206/11965 2022-03-24T07:15:14Z 2020-09-01T00:00:00Z

Title: The linkages between Antarctic sea ice extent and Indian summer monsoon rainfall Authors: Azhar, Siti Syairah Atiqah; Chenoli, Sheeba Nettukandy; Abu Samah, Azizan; Kim, Seong-Joong Abstract: Teleconnection between the Antarctic sea ice and the tropical climate has been extensively investigated. This study examines the interannual relationship between the variability of sea ice extent in the Indian Ocean sector (20-90 degrees E) and Indian summer monsoon rainfall under the influence of the Mascarene High. Sea ice extent during April-May-June (AMJ) appears to have a significant correlation with the summer monsoon rainfall over Peninsular India region during June-July-August-September from 1979 to 2013. Composites of mean sea level pressure (MSLP), 500 hPa geopotential height, and 850 hPa wind anomalies during high and low ice phases show a positive relation between the sea ice extent and the Mascarene High, revealing that high (low) ice phase corresponds respectively to the strengthening (weakening) of the Mascarene High as well as an increase (decrease) in Indian summer monsoon rainfall. During the respective high (low) ice phase years, positive (negative) MSLP anomalies were found, particularly over the Mascarene High region, associated with the eastwards (westwards) shifts of its climatology locations. Similar features were observed at 500 hPa geopotential height anomalies. In addition, strong anticyclonic (cyclonic) anomalies in the Mascarene High region were found in 850 hPa winds, which led to corresponding strong (weak) south westerlies and thus respective positive (negative) Indian summer monsoon rainfall anomalies.

2020-09-01T00:00:00Z Kwon, Hataek Choi, Hyesun Kim, Baek-Min Kim, Sang-Woo Kim, Seong-Joong https://repository.kopri.re.kr/handle/201206/11958 2022-03-24T07:15:43Z 2020-09-01T00:00:00Z

Title: Recent weakening of the southern stratospheric polar vortex and its impact on the surface climate over Antarctica Authors: Kwon, Hataek; Choi, Hyesun; Kim, Baek-Min; Kim, Sang-Woo; Kim, Seong-Joong Abstract: The variability in the southern stratospheric polar vortex (SSPV) and its downward coupling with the troposphere are known to play a crucial role in driving climate variability over Antarctica. In this study, SSPV weakening events and their impacts on the surface climate of Antarctica are examined usingin-situobservation and reanalysis data. Combining criteria from several previous studies, we introduce a new detection method for SSPV weakening events. Based on the new criteria, the occurrence frequency of SSPV weakening events has exhibited a systematic increasing trend since the 2000 s. However, the weakened anomalies of individual SSPV events are not statistically different (95% confidence level) between the earlier (1979-1999) and later (2000-2017) periods examined in this study. The recent increase in the occurrence of SSPV weakening events is largely controlled by tropospheric mechanisms, i.e. the poleward heat flux carried by southern hemispheric planetary waves and associated vertical wave propagation. Among the various scales of planetary waves, the wavenumber 1 contributes most of the poleward eddy heat flux. We show that SSPV weakening events induce statistically significant cooling over the Antarctic Peninsula (AP) region and warming over the rest of Antarctica. Typically, surface air temperature anomalies with large negative values smaller than - 0.6 degrees C and positive values larger than + 0.8 degrees C are observed over the east coast of the tip of the AP and King Edward VII Land, respectively. The influence of an SSPV weakening event on the surface lasts for approximately three months with higher height anomalies off western Antarctica, providing favorable conditions for the atmosphere to transport cold air from the interior of Antarctica to the AP via the Weddell Sea. Distinct positive surface air temperature anomalies over the rest of Antarctica are associated with the northerly circulation anomaly from the eastern Weddell Sea to east Antarctica.

2020-09-01T00:00:00Z Jun, Sang-Yoon Kim, Joo-Hong Choi, Choi Kim, Seong-Joong Kim, Baek-Min An, Soon-Il https://repository.kopri.re.kr/handle/201206/11976 2022-03-24T07:15:05Z 2020-06-01T00:00:00Z

Title: The internal origin of the west-east asymmetry of Antarctic climate change Authors: Jun, Sang-Yoon; Kim, Joo-Hong; Choi, Choi; Kim, Seong-Joong; Kim, Baek-Min; An, Soon-Il Abstract: Recent Antarctic surface climate change has been characterized by greater warming trends in West Antarctica than in East Antarctica. Although this asymmetric feature is well recognized, its origin remains poorly understood. Here, by analyzing observation data and multi-model results, we show that a westeast asymmetric internal mode amplified in austral winter originates from the harmony of the atmosphere-ocean coupled feedback off West Antarctica and the Antarctic terrain. The warmer ocean temperature over the West Antarctic sector has positive feedback, with an anomalous upper-tropospheric anti-cyclonic circulation response centered over West Antarctica, in which the strength of the feedback is controlled by the Antarctic topographic layout and the annual cycle. The current westeast asymmetry of Antarctic surface climate change is undoubtedly of natural origin because no external factors (e.g., orbital or anthropogenic factors) contribute to the asymmetric mode.

2020-06-01T00:00:00Z