Preprints
https://doi.org/10.5194/acpd-13-14037-2013
https://doi.org/10.5194/acpd-13-14037-2013

  28 May 2013

28 May 2013

Review status: this preprint has been withdrawn by the authors.

An evaluation of the CMAQ reproducibility of satellite tropospheric NO2 column observations at different local times over East Asia

H. Irie1, K. Yamaji2, K. Ikeda2, I. Uno3, S. Itahashi4, T. Ohara5, and J. Kurokawa6 H. Irie et al.
  • 1Center for Environmental Remote Sensing, Chiba University, 1-33 Yayoicho, Inage-ku, Chiba 263-8522, Japan
  • 2Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan
  • 3Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga Park, Kasuga, Fukuoka 816-8580, Japan
  • 4Department of Earth System Science and Technology, Kyushu University, 6-1 Kasuga Park, Kasuga, Fukuoka 816-8580, Japan
  • 5National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
  • 6Asia Center for Air Pollution Research, 1182 Sowa, Nishi-ku, Niigata 950-2144, Japan

Abstract. Despite the importance of the role of nitrogen dioxide (NO2) in tropospheric chemistry, the causes leading to the discrepancy between satellite-derived and modeled tropospheric NO2 vertical column densities (VCDs) over East Asia remain unclear. Here the reproducibility of satellite tropospheric NO2 VCD data by a regional chemical transport model (CMAQ) with the Regional Emission inventory in ASia (REAS) Version 2 is evaluated from the viewpoint of the diurnal variation of tropospheric NO2 VCDs, where satellite observations at different local times (SCIAMACHY/ENVISAT, OMI/Aura, and GOME-2/Metop-A) are utilized considering literature validation results. As a case study, we concentrate on June and December 2007 for a detailed evaluation based on various sensitivity simulations, for example with different spatial resolutions (80, 40, 20, and 10 km) for CMAQ. For June, CMAQ generally reproduces absolute values of satellite NO2 VCDs and their diurnal variations over all 12 selected diagnostic regions in East Asia. In contrast, a difficulty arises in interpreting the significant disagreement between satellite and CMAQ values over most of the diagnostic regions in December. The disagreement cannot be explained by any of the sensitivity simulations performed in this study. To address this, more investigations, including further efforts for satellite validations in wintertime, are needed.

This preprint has been withdrawn.

H. Irie et al.

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Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

H. Irie et al.

H. Irie et al.

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