Application of Inversion Technique to Quick Update of Anthropogenic NO<sub>x</sub> Emission with Satellite Observations and Chemical Transport Model

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  • 逆推計手法を利用したNO<sub>x</sub>排出量インベントリの速報アップデート
  • 逆推計手法を利用したNOx排出量インベントリの速報アップデート
  • ギャクスイケイ シュホウ オ リヨウ シタ NOx ハイシュツリョウ インベントリ ノ ソクホウ アップデート

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Abstract

We developed a quick update method for an emission inventory with an inverse technique, and extended the Chinese anthropogenic NOx emission in Regional Emission inventory in the ASia version 2.1 (REAS 2.1) through 2009–May 2013 with satellite observations and a chemical transport model. The satellite observations exhibited a drastic inter-annual variation in the tropospheric NO2 vertical column densities (VCDs) over the eastern Chinese region depending on the socioeconomic conditions. The increase in the NO2 VCD became sluggish during 2008–2009 due to pollutant controls by the 2008 Beijing Olympic game and the global depression, but revived in 2010 with a growth rate of 37.3%/year. A posteriori NO2 VCD successfully reproduced the inter-annual variation in the observed one, and captured the observed seasonal cycle in which the seasonal peak and bottom appear in the winter and summer, respectively. The updated Chinese anthropogenic NOx emissions during 2009–2012 were 25.7, 27.3, 28.2, 28.4 Tg/year and fell within the range of the various estimates in the literature. We estimated an annual growth rate during 2009–2012 and 2005–2012 to be 3.5%/year (0.9 Tg/year) and 5.3%/year (1.1 Tg/year), respectively.

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