An evaluation of the CMAQ reproducibility of satellite tropospheric NO2 column observations at different local times over East Asia
Item
Title (Dublin Core)
An evaluation of the CMAQ reproducibility of satellite tropospheric NO2 column observations at different local times over East Asia
Description (Dublin Core)
Despite the importance of the role of nitrogen dioxide (NO<sub>2</sub>) in tropospheric chemistry, the causes leading to the discrepancy between satellite-derived and modeled tropospheric NO<sub>2</sub> vertical column densities (VCDs) over East Asia remain unclear. Here the reproducibility of satellite tropospheric NO<sub>2</sub> 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 NO<sub>2</sub> 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 NO<sub>2</sub> 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.
Creator (Dublin Core)
Irie, H.
Yamaji, K.
Ikeda, K.
Uno, I.
Itahashi, S.
Ohara, T.
Kurokawa, J.
Date (Dublin Core)
2018-08-11
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acpd-13-14037-2013
https://acp.copernicus.org/preprints/acp-2013-215/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
