Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS04] Atmospheric Chemistry

Wed. May 29, 2019 1:45 PM - 3:15 PM 102 (1F)

convener:Tomoki Nakayama(Graduate School of Fisheries and Environmental Sciences, Nagasaki University), Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Sakae Toyoda(Department of Chemical Science and Engineering, Tokyo Institute of Technology), Nawo Eguchi(Kyushu University), Chairperson:Takashi Maki(気象研究所)

2:30 PM - 2:45 PM

[AAS04-09] Black Carbon and Inorganic Aerosols in Snowpack over the Arctic

*Tatsuhiro Mori1, Kumiko Goto-Azuma2,3, Yutaka Kondo2, Yoshimi Ogawa-Tsukagawa2, Kazuhiko Miura1, Motohiro Hirabayashi2, Naga Oshima4, Makoto Koike5, Kaarle Kupiainen6, Nobuhiro Moteki5, Sho Ohata7, Sinha Puna Ram8, Konosuke Sugiura9, Teruo Aoki10, Martin Schneebeli11, Konrad Steffen11, Atsushi Sato12, Akane Tsushima13, Vladimir Makarov14, Satoshi Omiya15,16, Atsuko Sugimoto17, Shinya Takano17 (1.Tokyo University of Science, 2.National Institute of Polar Research, 3.The Graduate University for Advanced Studies, 4.Meteorological Research Institute, 5.Depertment of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 6.Environmental Protection Department Ministry of the Environment, 7.Institute for Space–Earth Environmental Research (ISEE), Nagoya University, 8.Department of Space Indian Space Research Organization, 9.University of Toyama, 10.Okayama University, 11.WSL Institute for Snow and Avalanche Research, 12.former Snow and Ice Research Center, 13.Reserach Institute for Humanity and Nature, 14.Melnikov’s Permafrost Institute, 15.Institute of Low Temperature Science, Hokkaido University, 16.Civil Engineering Research Institute for Cold Region, 17.Graduate School of Environmental Science, Hokkaido University)

Keywords:Black carbon, Wet deposition, Arctic

Black carbon (BC) deposited on snow lowers snow albedo, potentially contributing to the warming in the Arctic. The distributions of inorganic aerosols (ions), which contribute to direct and indirect aerosol effects, are also greatly influenced by deposition. It is critically important to measure the spatial distributions of BC and ions in snowpack in different regions of the Arctic to quantify these effects. Because accurate measurements of BC and ions in snowpack are very limited, we measured the mass concentrations of size-resolved BC (CMBC) and ions in snowpack over Finland, Alaska, Siberia, Greenland, and Spitzbergen in early spring during the period of 2012 – 2016 by using a single-particle soot photometer and ion chromatography, respectively. BC deposition amounts (DEPMBC) during snow accumulation periods were derived from CMBC and snow water equivalent (SWE). Detailed analyses have shown that the spatial distributions of the anthropogenic BC flux and topography strongly influenced the latitudinal variations of CMBC and BC size distributions. The average size distributions of BC in snowpack shifted to smaller sizes with the decrease in CMBC, likely due to an increase in the removal efficiency of BC with the increase in BC diameter during transport from major BC sources. The present CMBC were much lower than previous CMBC measured by using an Integrating Sphere/Integrating Sandwich spectrophotometer by a factor of about 13. The present accurate data of CMBC, SWE, and DEPMBC are very useful in constraining climate model to estimate the effect of BC on the climate of the Arctic.