Temporal variations of nitrogen wet deposition across Japan from 1989 to 2008

Y. Morino, T. Ohara, J. Kurokawa, M. Kuribayashi, Itsushi Uno, H. Hara

Research output: Contribution to journalArticle

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Abstract

To evaluate temporal variations in nitrogen wet deposition across Japan during 1989-2008, we analyzed results of a chemical transport model (the Models-3 Community Multiscale Air Quality) and observational data. The model successfully reproduced the general patterns of spatial and temporal variations of observed NO3- wet deposition rates. Wet deposition rates of NO3- across Japan increased during 1989-2008, with rates of increase of 2-5%/yr. Sensitivity simulations indicated that the increase of NO3- wet deposition rates was mostly (61%-94%) explained by the increased emissions of atmospheric pollutants in China. Contributions of China's emissions increased from 29%-35% during 1989-1993 to 43%-61% during 2004-2008, suggesting that transboundary pollution had a large impact on NO3- wet deposition in Japan. The contribution of observed NO3- to total nitrogen wet deposition (i.e., NO3- + NH4+) increased in southwestern Japan, and currently, NO3- and NH 4+ make similar contributions to nitrogen wet deposition across Japan. Interannual variation of NO3- wet deposition was further evaluated using a meteorological index, area-weighted surface pressure anomaly (ASPA). When ASPA was negative, air masses from the Asian continent were more directly transported to Japan, and NO3 - concentrations across Japan became high. Thus, anomalies of NO 3- concentrations were negatively correlated with ASPA. Anomalies of NO3- wet deposition rates, however, showed a weak positive correlation with ASPA, reflecting a positive correlation between anomalies in precipitation rates and ASPA. This result strongly suggests that precipitation patterns have a large impact on the interannual variation of NO3- wet deposition across Japan.

Original languageEnglish
Article numberD06307
JournalJournal of Geophysical Research Atmospheres
Volume116
Issue number6
DOIs
Publication statusPublished - Jan 1 2011

Fingerprint

wet deposition
temporal variation
Japan
Nitrogen
Deposition rates
nitrogen
anomalies
surface pressure
anomaly
annual variations
annual variation
China
Air quality
transboundary pollution
Pollution
air quality
air masses
continents
pollution
air mass

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Temporal variations of nitrogen wet deposition across Japan from 1989 to 2008. / Morino, Y.; Ohara, T.; Kurokawa, J.; Kuribayashi, M.; Uno, Itsushi; Hara, H.

In: Journal of Geophysical Research Atmospheres, Vol. 116, No. 6, D06307, 01.01.2011.

Research output: Contribution to journalArticle

Morino, Y. ; Ohara, T. ; Kurokawa, J. ; Kuribayashi, M. ; Uno, Itsushi ; Hara, H. / Temporal variations of nitrogen wet deposition across Japan from 1989 to 2008. In: Journal of Geophysical Research Atmospheres. 2011 ; Vol. 116, No. 6.
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