https://repository.kopri.re.kr/handle/201206/11546 2026-04-23T07:39:52Z 2026-04-23T07:39:52Z Choi, Na-Rae Yoon, Young Jun Park, Ki-Tae Kim, Ki-Ae Kim, Yong-Pyo Ahn, Yun-Gyong Lee, Ji-Yi https://repository.kopri.re.kr/handle/201206/12971 2022-03-24T07:15:44Z 2021-04-01T00:00:00Z

Title: Trace Level Determination of Saccharides in Pristine Marine Aerosols by Gas Chromatography―Tandem Mass Spectrometry Authors: Choi, Na-Rae; Yoon, Young Jun; Park, Ki-Tae; Kim, Ki-Ae; Kim, Yong-Pyo; Ahn, Yun-Gyong; Lee, Ji-Yi Abstract: The quantification and identification of saccharides in pristine marine aerosols can provide useful information for determining the contributions of anthropogenic and natural sources of the aerosol. However, individual saccharide compounds in pristine marine aerosols that exist in trace amounts are difficult to analyze due to their low concentrations. Thus, in this study, we applied gas chromatography？tandem mass spectrometry (GC-MS/MS) in multiple reaction monitoring (MRM) mode to analyze the particulate matter with an aerodynamic diameter equal or less than 2.5 μm (PM2.5) samples, and the results were compared with those of conventional GC-MS. To investigate the chemical properties of pristine marine aerosols, 12 PM2.5 samples were collected while aboard Araon, an ice-breaking research vessel (IBRV), as it sailed from Incheon, South Korea to Antarctica. The method detection limits of GC-MS/MS for 10 saccharides were 2？22-fold lower than those of GC-MS. Consequently, the advantages of GC-MS/MS include (1) more distinct peak separations, enabling the accurate identification of the target saccharides and (2) the quantification of all individual saccharide compounds with concentrations outside the quantifiable range of GC-MS. Accordingly, the time resolution for sampling saccharides in pristine marine aerosols can be improved with GC-MS/MS.

2021-04-01T00:00:00Z Zhang, Miming Park, Ki-Tae Yan, Jinpei Park, Keyhong Wu, Yanfang Jang, Eunho Gao, Wei Tan, Guobin Wang, Jianjun Chen, Liqi https://repository.kopri.re.kr/handle/201206/11945 2022-03-24T07:14:50Z 2020-07-01T00:00:00Z

Title: Atmospheric dimethyl sulfide and its significant influence on the sea-to-air flux calculation over the Southern Ocean Authors: Zhang, Miming; Park, Ki-Tae; Yan, Jinpei; Park, Keyhong; Wu, Yanfang; Jang, Eunho; Gao, Wei; Tan, Guobin; Wang, Jianjun; Chen, Liqi Abstract: Our understanding about the atmospheric dimethyl sulfide (DMS) and its influence to sea-to-air flux calculation in the Southern Ocean is still limited due to insufficient investigations. Herein, high-resolution shipboard underway simultaneous surface seawater and atmospheric DMS measurements were conducted in the Southern Ocean from February 23 to March 31, 2018. A larger variation of DMS levels was found in atmosphere compared with that in seawater. Remarkably, a large-scale area with high seawater and atmospheric DMS concentrations up to 27.9 nM and 3.92 ppbv, respectively, was investigated outside of Ross Sea sector. Atmospheric DMS levels were strongly impacted by wind speed and air mass convection. The relationship between atmospheric DMS and air mass exposure to oceanic chlorophyll varied greatly depending on the area of investigation. Some other regions with high DMS production capacity were examined as well beside those along the cruise tracks based on the results of positive correlations with high slopes and back trajectories. Moreover, significant uncertainty of sea-to-air DMS flux over the Southern Ocean could be caused by follows: (1) the selecting of different gas transfer coefficients; (2) the negative flux values calculated under high atmospheric DMS levels together with low seawater DMS concentrations; and (3) the greatly overestimated flux, approximately 47.1-76.9%, without considering the atmospheric DMS. This study highlights the urgent demand of high-resolution observations of atmospheric DMS over the Southern Ocean to estimate DMS emission with high accuracy.

2020-07-01T00:00:00Z Jang, Jiyi Park, Jiyeon Ahn, Seo-Hee Park, Ki-Tae Ha, Sun-Yong Park, Jongkwan Cho, Kyung Hwa https://repository.kopri.re.kr/handle/201206/11972 2022-03-24T07:15:15Z 2020-06-01T00:00:00Z

Title: Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica Authors: Jang, Jiyi; Park, Jiyeon; Ahn, Seo-Hee; Park, Ki-Tae; Ha, Sun-Yong; Park, Jongkwan; Cho, Kyung Hwa Abstract: The Antarctic shelf systems plays an important role in organic matter circulation on Earth; hence, identifying the characteristics of dissolved organic matter (DOM) can be a good indicator for understanding its origin, as well as climate change. In this study, to identify the characteristics of DOM in the Antarctic shelf systems, surface water was collected from the open sea (OS) and Marian cove (Fjord; FJ). Although there were no differences in DOM characteristics between sampling sites in quantitative analyses, the DOM in surface water of each region seemed to be more affected by terrestrial than marine biological sources in optical and molecular properties. This finding indicates that the terrestrial DOM related to mosses based on the molecular properties results; high levels of lipid-like (3539%) and unsaturated hydrocarbon-like (UH; 2734%) in both the OS and FJ regions, and significantly higher tannin-like substance and condensed aromatic structures (CAS) in the FJ than the OS region. When comparing the FJ transect samples, those nearest to a glacier (FJ1; 0.93 km from the glacier) showed relatively low salinity, high dissolved organic carbon (DOC), and high chromophoric DOM (CDOM), indicating that terrestrial DOM (possibly produced by moss) inflow occurred with the runoff from the freshly melting land ice and glacier. However, no significant differences in molecular composition were detected, suggesting that terrestrial DOM introduced into the Antarctic shelf systems by melting land ice and glacier runoff could be a major source of DOM-rich seawater during austral fall, when low marine biological activity occurs. This study has a great significance as background data for DOM characteristics in the Antarctic shelf systems due to the enhanced biological activity during the austral summer.

2020-06-01T00:00:00Z Park, Jiyeon Dall'Osto, Manuel Park, Kihong Gim, Yeontae Kang, Hyo Jin Jang, Eunho Park, Ki-Tae Park, Minsu Yum, Seong Soo Jung, Jinyoung Lee, Bang Yong Yoon, Young Jun https://repository.kopri.re.kr/handle/201206/13044 2022-03-24T07:14:56Z 2020-05-13T00:00:00Z

Title: Shipborne observations reveal contrasting Arctic marine, Arctic terrestrial and Pacific marine aerosol properties Authors: Park, Jiyeon; Dall'Osto, Manuel; Park, Kihong; Gim, Yeontae; Kang, Hyo Jin; Jang, Eunho; Park, Ki-Tae; Park, Minsu; Yum, Seong Soo; Jung, Jinyoung; Lee, Bang Yong; Yoon, Young Jun Abstract: There are few shipborne observations addressing the factors influencing the relationships of the formation and growth of aerosol particles with cloud condensation nuclei (CCN) in remote marine environments. In this study, the physical properties of aerosol particles throughout the Arctic Ocean and Pacific Ocean were measured aboard the Korean icebreaker R/V Araon during the summer of 2017 for 25 d. A number of new particle formation (NPF) events and growth were frequently observed in both Arctic terrestrial and Arctic marine air masses. By striking contrast, NPF events were not detected in Pacific marine air masses. Three major aerosol categories are therefore discussed: (1) Arctic marine (aerosol number concentration CN2.5: 413 +/- 442 cm(-3)), (2) Arctic terrestrial (CN2.5: 1622 +/- 1450 cm(-3)) and (3) Pacific marine (CN2.5: 397 +/- 185 cm(-3)), following air mass back-trajectory analysis. A major conclusion of this study is not only that the Arctic Ocean is a major source of secondary aerosol formation relative to the Pacific Ocean but also that open-ocean sympagic and terrestrially influenced coastal ecosystems both contribute to shaping aerosol size distributions. We suggest that terrestrial ecosystems - including river outflows and tundra - strongly affect aerosol emissions in the Arctic coastal areas, possibly more than anthropogenic Arctic emissions. The increased river discharge, tundra emissions and melting sea ice should be considered in future Arctic atmospheric composition and climate simulations. The average CCN concentrations at a supersaturation ratios of 0.4 % were 35 +/- 40 cm(-3), 71 +/- 47 cm(-3) and 204 +/- 87 cm(-3) for Arctic marine, Arctic terrestrial and Pacific marine aerosol categories, respectively. Our results aim to help evaluate how anthropogenic and natural atmospheric sources and processes affect the aerosol composition and cloud properties.

2020-05-13T00:00:00Z