Black Carbon and Inorganic Aerosols in Arctic Snowpack

Tatsuhiro Mori, Kumiko Goto-Azuma, Yutaka Kondo, Yoshimi Ogawa-Tsukagawa, Kazuhiko Miura, Motohiro Hirabayashi, Naga Oshima, Makoto Koike, Kaarle Kupiainen, Nobuhiro Moteki, Sho Ohata, P. R. Sinha, Konosuke Sugiura, Teruo Aoki, Martin Schneebeli, Konrad Steffen, Atsushi Sato, Akane Tsushima, Vladimir Makarov, Satoshi OmiyaAtsuko Sugimoto, Shinya Takano, Naoko Nagatsuka

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Black carbon (BC) deposited on snow lowers its albedo, potentially contributing to warming in the Arctic. Atmospheric distributions of BC and inorganic aerosols, which contribute directly and indirectly to radiative forcing, are also greatly influenced by depositions. To quantify these effects, accurate measurement of the spatial distributions of BC and ionic species representative of inorganic aerosols (ionic species hereafter) in snowpack in various regions of the Arctic is needed, but few such measurements are available. We measured mass concentrations of size-resolved BC (CMBC) and ionic species in snowpack by using a single-particle soot photometer and ion chromatography, respectively, over Finland, Alaska, Siberia, Greenland, and Spitsbergen during early spring in 2012–2016. Total BC mass deposited per unit area (DEPMBC) during snow accumulation periods was derived from CMBC and snow water equivalent (SWE). Our analyses showed that the spatial distributions of anthropogenic BC emission flux, total precipitable water, and topography strongly influenced latitudinal variations of CMBC, BC size distributions, SWE, and DEPMBC. The average size distributions of BC in Arctic snowpack shifted to smaller sizes with decreasing CMBC due to an increase in the removal efficiency of larger BC particles during transport from major sources. Our measurements of CMBC were lower by a factor of ~13 than previous measurements made with an Integrating Sphere/Integrating Sandwich spectrophotometer due mainly to interference from coexisting non-BC particles such as mineral dust. The SP2 data presented here will be useful for constraining climate models that estimate the effects of BC on the Arctic climate.

Original languageEnglish
Pages (from-to)13325-13356
Number of pages32
JournalJournal of Geophysical Research: Atmospheres
Volume124
Issue number23
DOIs
Publication statusPublished - 2019 Dec 16
Externally publishedYes

Keywords

  • Arctic
  • black carbon
  • deposition
  • inorganic aerosols
  • single-particle soot photometer
  • snow water equivalent

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Black Carbon and Inorganic Aerosols in Arctic Snowpack'. Together they form a unique fingerprint.

Cite this