Analysis of Kinetic Behaviors of the Methane Concentration in Urban Atmosphere of Nagoya

• ITOH Akinori

  (Department of Applied Chemistry, Graduate School of Engineering,Nagoya University

• TOMIDA Mlchlo

  (Department of Applied Chemistry, Graduate School of Engineering,Nagoya University

• TAKAHASHI Ichiro

  (Department of Applied Chemistry, Graduate School of Engineering,Nagoya University

• NAGATA Yoko

  (Department of Applied Chemistry, Graduate School of Engineering,Nagoya University

• AIKAWA Masahide

  (Department of Applied Chemistry, Graduate School of Engineering,Nagoya University

• SAWATARI Hideyuki

  (Department of Applied Chemistry, Graduate School of Engineering,Nagoya University

• HARAGUCHI Hiroki

  (Department of Applied Chemistry, Graduate School of Engineering,Nagoya University

Bibliographic Information

Other Title

• 名古屋市における都市大気中メタン濃度の動態解析
• ナゴヤシ ニ オケル トシ タイキチュウ メタン ノウド ノ ドウタイ カイセ

Abstract

The continuous monitoring of the atmospheric CH4 concentration has been performed in the campus of Nagoya University, and multivariate analysis was applied to the data including the monitoring data obtained at the 7 observatory stations of Nagoya City during 1991-1995. Cluster analysis was used for the analysis of the kineticbehaviors of CH4 in urban atmosphere of Nagoya. When correlation coefficientsamong the data at the 8 stations were implemented for the measure of similarity, Nagoya City was divided mainly into two groups of urban and suburban areas. Then, when Euclidean distance metric was also applied to the same data set, the Nagoya University and Higashisakura station belonged to one cluster, where the CH4 concentrations had been kept at the higher concentration. Furthermore, time series analysiswas applied to the CH4 concentrations observed at the Nagoya University for 1991-1996, where a digital filtering technique employing the fast Fourier transform and low-pass filter was used for smoothing the data. The growth rate variations showed the slowing down in 1992 and from 1993 to 1995. Finally the CH₄ out-flux in Nagoya Cityarea was estimated as 2.0-2.7 tCH4 km^-2 yr^-1 from the mass balance of CH₄ .

Journal

• ENVIRONMENTAL SCIENCE

  ENVIRONMENTAL SCIENCE 11 (3), 289-296, 1998

  SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

Keywords

• methane, urban area, cluster analysis, long-term growth rate, out-flux

Details

• CRID: 1390282679397099520
• NII Article ID: 10002758847
• NII Article ID: 130004303914
• NII Book ID: AN10165252
• DOI: 10.11353/sesj1988.11.289
• ISSN: 18845029
• ISSN: 09150048
• NDL BIB ID: 4562759
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4562759
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed