여름철 남극 아문젠 폴리냐에서 표층 DMS분포 연구

Abstract

Dimethyl sulfide (DMS) is one of major precursors of cloud condensation nuclei and predominantly emitted from the ocean. Particularly, during austral summer, the Southern Ocean is the strongest source of DMS due to the phaeocystis blooms. Therefore, accurate estimate of DMS emission in the Southern Ocean is essential to understand interaction between climate and ocean environment. However, despite the importance of DMS flux estimate in the Southern Ocean, DMS measurements inthe Southern Ocean are significantly under-sampled due to its limited accessibility. Polynyas in the coastal shelf region exhibit strong productivity. Especially, Amundsen Sea polynya has been reported as the strongest productivity regionamong the polynyas in the Southern Ocean. Thus, DMS emission from the Amundsen Sea Polynya is noticeably strong as well. Furthermore, high-frequency measurement is required to improve accuracy of the flux estimate because of large spatio-temporal variability of phytoplankton distribution in the polynya. In this study, Korean icebreaking vessel R/V Araon’s 2015-16 and 2017-18 onboard observation of surface DMS in the Amundsen Sea polynya will be presented. We implemented high-frequency continuous measurement using membrane-inlet mass spectrometer. Additionally, R/V Araon’s 2018 austral autumn observation of DMS in the Antarctic Peninsular region will be shown.herefore, accurate estimate of DMS emission in the Southern Ocean is essential to understand interaction between climate and ocean environment. However, despite the importance of DMS flux estimate in the Southern Ocean, DMS measurements inthe Southern Ocean are significantly under-sampled due to its limited accessibility. Polynyas in the coastal shelf region exhibit strong productivity. Especially, Amundsen Sea polynya has been reported as the strongest productivity regionamong the polynyas in the Southern Ocean. Thus, DMS emission from the Amundsen Sea Polynya is noticeably strong as well. Furthermore, high-frequency measurement is required to improve accuracy of the flux estimate because of large spatio-temporal variability of phytoplankton distribution in the polynya. In this study, Korean icebreaking vessel R/V Araon’s 2015-16 and 2017-18 onboard observation of surface DMS in the Amundsen Sea polynya will be presented. We implemented high-frequency continuous measurement using membrane-inlet mass spectrometer. Additionally, R/V Araon’s 2018 austral autumn observation of DMS in the Antarctic Peninsular region will be shown.