Chapter 3.6 Application of four-dimensional variational (4DVAR) data assimilation for optimal estimation of mineral dust and CO emissions in eastern Asia

研究成果: 著書/レポートタイプへの貢献

抜粋

A four-dimensional variational (4DVAR) data assimilation system was developed for a regional chemical transport model (CTM). In this study, we applied it to inverse modeling of CO emissions and mineral dust emission flux over East Asia, and demonstrated the feasibility of our assimilation system. In CO inverse modeling, three ground-based observations were used for estimating CO emission over East Asia. Assimilated results showed better agreement with observations; the RMS differences were reduced by 16-27%. CO emission over industrialized east central China between Shanghai and Beijing has increased markedly, and the results show that the annual anthropogenic (fossil and biofuel combustion) CO emission over China are 147 Tg. In dust inverse modeling, NIES LIDAR observations were used. The assimilated results better reflects the presence of the elevated dust layer and improved the under-prediction of dust concentrations. We obtained an 18% increase in calculated dust emissions through data assimilations, especially over the Mongolian region, indicating that the observed high-dense dust layer might originate in that region. These data assimilation results indicate that the 4DVAR method is very powerful for unification of observation and numerical modeling by CTM.

元の言語英語
ホスト出版物のタイトルAir Pollution Modeling and Its Application XVIII
編集者Carlos Borrego, Eberhard Renner
ページ318-328
ページ数11
DOI
出版物ステータス出版済み - 12 1 2007

出版物シリーズ

名前Developments in Environmental Science
6
ISSN(印刷物)1474-8177

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Pollution
  • Atmospheric Science
  • Health, Toxicology and Mutagenesis

これを引用

Yumimoto, K., & Uno, I. (2007). Chapter 3.6 Application of four-dimensional variational (4DVAR) data assimilation for optimal estimation of mineral dust and CO emissions in eastern Asia. : C. Borrego, & E. Renner (版), Air Pollution Modeling and Its Application XVIII (pp. 318-328). (Developments in Environmental Science; 巻数 6). https://doi.org/10.1016/S1474-8177(07)06036-6