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Título: | First-year sea ice leads to an increase in dimethyl sulfide-induced particle formation in the Antarctic Peninsula |
Autor: | Jang, Eunho; Park, Ki-Tae; Yoon, Young Jun; Kim, Kitae; Gim, Yeontae; Chung, Hyun Young; Lee, Kitack; Choi, Jinhee; Park, Jiyeon; Park, Sang-Jong; Koo, Ja-Ho; Fernández, Rafael P. CSIC ORCID; Saiz-Lopez, A. CSIC ORCID | Palabras clave: | Antarctic peninsula Bromine monoxide Dimethyl sulfide First-Year Sea ice New particle formation Sulfurous particles |
Fecha de publicación: | 10-ene-2022 | Editor: | Elsevier BV | Citación: | Science of the Total Environment 803: 150002 (2022) | Resumen: | Dimethyl sulfide (DMS) produced by marine algae represents the largest natural emission of sulfur to the atmosphere. The oxidation of DMS is a key process affecting new particle formation that contributes to the radiative forcing of the Earth. In this study, atmospheric DMS and its major oxidation products (methanesulfonic acid, MSA; non-sea-salt sulfate, nss-SO42-) and particle size distributions were measured at King Sejong station located in the Antarctic Peninsula during the austral spring-summer period in 2018-2020. The observatory was surrounded by open ocean and first-year and multi-year sea ice. Importantly, oceanic emissions and atmospheric oxidation of DMS showed distinct differences depending on source regions. A high mixing ratio of atmospheric DMS was observed when air masses were influenced by the open ocean and first-year sea ice due to the abundance of DMS producers such as pelagic phaeocystis and ice algae. However, the concentrations of MSA and nss-SO42- were distinctively increased for air masses originating from first-year sea ice as compared to those originating from the open ocean and multi-year sea ice, suggesting additional influences from the source regions of atmospheric oxidants. Heterogeneous chemical processes that actively occur over first-year sea ice tend to accelerate the release of bromine monoxide (BrO), which is the most efficient DMS oxidant in Antarctica. Model-estimates for surface BrO confirmed that high BrO mixing ratios were closely associated with first-year sea ice, thus enhancing DMS oxidation. Consequently, the concentration of newly formed particles originated from first-year sea ice, which was a strong source area for both DMS and BrO was greater than from open ocean (high DMS but low BrO). These results indicate that first-year sea ice plays an important yet overlooked role in DMS-induced new particle formation in polar environments, where warming-induced sea ice changes are pronounced. | Descripción: | 9 pags, 4 figs. -- The datasets for atmospheric DMS, its oxidative products, and aerosol size distribution are available at the Korea Polar Data Center (https://dx. doi.org/doi:10.22663/KOPRI-KPDC-00001657.4). The sea ice data can be downloaded from the NSIDC website (https://nsidc.org/data/G02135/versions/3). The MODIS-Aqua products can be downloaded from the NASA Ocean Color website (https://oceandata.sci.gsfc.nasa. gov/MODIS-Aqua/). MIMOC is available at https:// www.pmel.noaa. gov/mimoc/. The PHYSAT products can be accessed from the PHYSAT website (https://log.cnrs.fr/Physat-332). The code for the CAM-Chem model is available at https://www2.acom.ucar.edu/gcm/cam-chem. -- Supplementary data to this article can be found online at https://doi.org/10.1016/j.scitotenv.2021.150002. | Versión del editor: | https://doi.org/10.1016/j.scitotenv.2021.150002 | URI: | http://hdl.handle.net/10261/257929 | DOI: | 10.1016/j.scitotenv.2021.150002 | ISSN: | 0048-9697 | E-ISSN: | 1879-1026 |
Aparece en las colecciones: | (IQF) Artículos |
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