해양 생물기원 DMS에 의한 북극 대기 미세입자 형성 관측
Doctor Atmospheric new particle formation and growth significantly influence climate by supplying new seeds for cloud condensation. Thus, observations of chemical processes in the atmosphere are crucial to understanding and predicting climate change. There is still a lack of knowledge on whether and...
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| Format: | Thesis |
| Language: | English |
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포항공과대학교
2021
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| Online Access: | http://postech.dcollection.net/common/orgView/200000506926 https://oasis.postech.ac.kr/handle/2014.oak/114200 |
| Summary: | Doctor Atmospheric new particle formation and growth significantly influence climate by supplying new seeds for cloud condensation. Thus, observations of chemical processes in the atmosphere are crucial to understanding and predicting climate change. There is still a lack of knowledge on whether and how marine biota emissions affect aerosol-cloud-climate interactions in the Arctic. Among many naturally produced gases, dimethyl sulfide (DMS) plays an important role in atmospheric sulfur budgets and radiative balance, having potentially climate-cooling effects. Especially during the bloom and post-bloom period when the anthropogenic influence is limited and biological activity is high, the marine biological DMS is of great importance for cloud formation. The harsh environment of the Arctic makes it difficult to perform in situ measurements of atmospheric DMS and related aerosols. But more measurements in the Arctic need to be successfully accomplished because the Arctic is the best place for evaluating the impact of DMS and its oxidation products (e.g. H2SO4 and MSA) on particle formation and growth, further radiative forcing. For this dissertation study, I conducted research that developing an analytical system capable of continuous measurement of atmospheric DMS and proving the robustness of the system (Chapter 2). And I collected aerosol samples (PM 2.5) to quantify the concentration of oxidation products of DMS in the Arctic atmosphere and elucidate the factors controlling the seasonal- and interannual variability of them (Chapter 3). By applying stable S isotope measurement technique, source apportionment of sulfate aerosols and the relationship between biogenic sulfate and fine aerosol particles were investigated (Chapter 4). First, I developed an analytical system capable of continuous measurement of atmospheric DMS at pptv levels. The system uses customized devices for detector calibration and for DMS trapping and desorption that are controlled using a data acquisition system designed to maximize the ... |
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