Tomoki Mochizuki1, Kimitaka Kawamura 1, Kazuma Aoki2

  • 1 Institute of Low Temperature Science, Hokkaido University, N19 W8, Kita-ku Sapporo 060-0819, Japan
  • 2 Department of Earth Science, Faculty of Science, University of Toyama, 3190, Gofuku, Toyama 930-8555, Japan

Received: April 24, 2015
Revised: August 16, 2015
Accepted: September 15, 2015
Download Citation: ||  

  • Download: PDF

Cite this article:
Mochizuki, T., Kawamura, K. and Aoki, K. (2016). Water-Soluble Organic Nitrogen in High Mountain Snow Samples from Central Japan. Aerosol Air Qual. Res. 16: 632-639.


  • Water-soluble organic nitrogen contributes to 15% of water-soluble total nitrogen.
  • Concentrations of WSON in high mountain snowpack samples are relatively low.
  • WSON is significantly less abundant than WSOC with the ratio of 24.
  • WSON in snow samples positively correlates with a dust tracer (nss-Ca).
  • WSON may be seriously decomposed during long-range transport.



We measured water-soluble organic nitrogen (WSON) in snow pit samples, which were collected at the Murodo-Daira snowfield near the summit of Mt. Tateyama, central Japan in 2008, 2009, and 2011. The concentrations of WSON ranged from 12.8 to 96.7 ng g–1, which were significantly lower than those reported in continental wet deposition samples from the Asian continent. WSON may be largely diluted in the snow samples during snowing processes over the high mountains. We found that WSON significantly correlated with nss-Ca2+ and water-soluble organic carbon (WSOC). Concentrations of WSON are likely controlled by the intensity of Asian dust events. Contributions of WSON to water soluble total nitrogen (WSTN) in snow pit sequence was found to be 15 ± 10%, which is lower than those (63–91%) of reference dust materials collected in China. Mass concentration ratio of WSOC/WSON was on average 23.7, which is significantly higher than the C/N weight ratio (5.6) calculated from the Redfield ratio. This result suggests that WSOC is largely produced by secondary photochemical oxidation of anthropogenic volatile organic compounds during the transport from East Asia to the high mountain areas in Japan. On the other hand, WSON may be contributed from Asian dusts from arid areas in China whereas water-soluble inorganic nitrogen may be derived from pollution sources.

Keywords: Water-soluble organic nitrogen; High mountain snow; Central Japan; Long-range atmospheric transport; East Asia

Share this article with your colleagues 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

79st percentile
Powered by
   SCImago Journal & Country Rank

2023 Impact Factor: 2.5
5-Year Impact Factor: 2.8

Aerosol and Air Quality Research partners with Publons

CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit
CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal that promotes submissions of high-quality research and strives to be one of the leading aerosol and air quality open-access journals in the world. We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.