| Title: | A 60 year record of atmospheric aerosol depositions preserved in a high-accumulation dome ice core, southeast Greenland |
| Authors: | Iizuka, Yoshinori Browse this author →KAKEN DB |
| Uemura, Ryu Browse this author →KAKEN DB |
| Fujita, Koji Browse this author →KAKEN DB |
| Hattori, Shohei Browse this author →KAKEN DB |
| Seki, Osamu Browse this author →KAKEN DB |
| Miyamoto, Chihiro Browse this author |
| Suzuki, Toshitaka Browse this author →KAKEN DB |
| Yoshida, Naohiro Browse this author →KAKEN DB |
| Motoyama, Hideaki Browse this author →KAKEN DB |
| Matoba, Sumito Browse this author →KAKEN DB |
| Keywords: | Anthropogenic Emission |
| Ice Core |
| Post-Depositional Effect |
| Nitrate |
| Sulfate |
| Greenland |
| Isotopic composition and chemistry |
| Ice cores |
| Chemical and biological geochronology |
| Cryospheric change |
| Regional climate change |
| Issue Date: | 4-Jan-2018 |
| Publisher: | American Geophysical Union |
| Journal Title: | Journal of Geophysical Research: Atmospheres |
| Volume: | 123 |
| Issue: | 1 |
| Start Page: | 574 |
| End Page: | 589 |
| Publisher DOI: | 10.1002/2017JD026733 |
| Abstract: | The Southeastern Greenland Dome (SE-Dome) has both a high elevation and a high accumulation rate (1.01 m w.e. yr-1), which are suitable properties for reconstructing past environmental changes with a high time resolution. For this study, we measured the major ion fluxes in a 90-m ice core drilled from the SE-Dome region in 2015, and present the records of annual ion fluxes from 1957 to 2014. From 1970 to 2010, the trend of non-sea-salt (nss) SO42- flux decreases, whereas that for NH4+ increases, tracking well with the anthropogenic SOx and NH3 emissions mainly from North America. The result suggests that these fluxes reflect histories of the anthropogenic SOx and NH3 emissions. In contrast, the decadal trend of NO3- flux differs from the decreasing trend of anthropogenic NOx emissions. Although the cause of this discrepancy remains unclear, it may be related to changes in particle formation processes and chemical scavenging rates caused by an increase in sea-salt and dust and/or a decrease in nssSO42-. We also find a high average NO3- flux (1.13 mmol m-2 yr-1) in the ice core, which suggests a negligible effect from post-depositional NO3- loss. Thus, the SE-Dome region is an excellent location for reconstructing nitrate fluxes. Over a decadal timescale, our NO3- flux record is similar to those from other ice cores in Greenland high-elevation sites, suggesting that NO3- concentrations records from these ice cores are reliable. |
| Rights: | Copyright 2018 American Geophysical Union. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/70919 |
| Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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