Analysis of variation factors in atmospheric methane concentration using WDCGG data

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  • WDCGGデータを用いた大気中メタン濃度の変動要因分析
  • WDCGGデータを用いた大気中メタン濃度の変動要因分析 : 韓国のGosanを対象にして
  • WDCGG データ オ モチイタ タイキ チュウ メタン ノウド ノ ヘンドウ ヨウイン ブンセキ : カンコク ノ Gosan オ タイショウ ニ シテ
  • －韓国のGosanを対象にして－
  • - A case study of Gosan observatory, Republic of Korea -

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Abstract

Currently, there is no extant technology that is able to measure only the amount of methane emission without recourse to laboratory work. Also, although observation data from Gosan, Republic of Korea, which is part of the WDCGG, is vital for understanding not only the atmospheric background pollution on the Korean Peninsula, but also background pollution carried long distances from the Asian mainland, the characteristics of this important data have yet to be clarified. With this in mind, this research evaluates factors influencing changes in methane concentrations at Gosan between 2007 and 2009, by applying the GEP Method (Greenhouse gases Emission Presumption Method), which is a method for evaluation the methane generation around an observation point, and analyzing observations of methane concentrations obtained by SCIAMACHY sensors. The results show that the annual average methane concentration in Gosan (1,858 ppb) increased by 18.2 ppb due to the influence of advection. The influence of advection from the mainland and peninsular was the largest factor in the concentration increment. In addition, general waste landfill and livestock production activities on Jeju Island were also considered to be factors in the increase. The research also evaluated the influence of wind direction on increases in methane concentration due to long distance advection. The results show that at wind speeds of 10.8-41.7 m/s, an increase of 38.9 ppb will occur by advection from mainland China with wind direction WNW-NNW and 24 ppb by advection from mainland South Korea with wind direction N-NE. A decrease of 29.8 ppb will be caused by advection from the East China Sea and western Pacific with wind direction SE-SSW. Increases in methane concentration due to long distance advection can be expected to be high in winter, when SE-SSW winds are relatively rare. The sources of methane concentration transported from the mainland and peninsular in summer may result from rice production.

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