Seasonal Variation of Wet Deposition of Black Carbon at Ny-Ålesund, Svalbard

Tatsuhiro Mori, Yutaka Kondo, Sho Ohata, Kumiko Goto-Azuma, Kaori Fukuda, Yoshimi Ogawa-Tsukagawa, Nobuhiro Moteki, Atsushi Yoshida, Makoto Koike, P. R. Sinha, Naga Oshima, Hitoshi Matsui, Yutaka Tobo, Masanori Yabuki, Wenche Aas

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Black carbon (BC) aerosol deposited in and onto Arctic snow increases the snow's absorption of solar radiation and accelerates snowmelt. Concentrations of BC in the Arctic atmosphere and snow are controlled by wet deposition; however, details of this process are poorly understood owing to the scarcity of time-resolved measurements of BC in hydrometeors. We measured mass concentrations of BC in hydrometeors (CMBC) and in air (MBC) with 16% and 15% accuracies, respectively, at Ny-Ålesund, Svalbard during 2012–2019. Median monthly MBC and CMBC values showed similar seasonal variations, being high in winter-spring and low in summer. Median monthly BC wet deposition mass flux (FMBC) was highest in winter and lowest in summer, associated with seasonal patterns of CMBC and precipitation. Seasonally averaged BC size distributions in hydrometeors were similar except for summer. Measurements of MBC and CMBC in spring 2017 showed a size-independent removal efficiency, indicating that BC-containing particles were efficiently activated into cloud droplets. These observations at Ny-Ålesund were compared with observations at Barrow, Alaska, during 2013–2017. The near-surface MBC at Ny-Ålesund and Barrow had similar seasonal patterns; however, the two sites differed in CMBC and FMBC. In summer, CMBC was low at Ny-Ålesund but moderate at Barrow, likely reflecting differences in MBC in the lower troposphere. Seasonally averaged BC size distributions in hydrometeors were similar at both sites, suggesting that average BC size distributions are similar in the Arctic lower troposphere. The efficiency of BC removal tends to be size-independent during transport, leading to the observed similarity.

Original languageEnglish
Article numbere2020JD034110
JournalJournal of Geophysical Research: Atmospheres
Issue number12
Publication statusPublished - 2021 Jun 27
Externally publishedYes


  • Arctic
  • Black carbon
  • seasonal variation
  • single-particle soot photometer
  • size distribution
  • wet deposition

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science


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