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| Titel |
Systematic analysis of interannual and seasonal variations of model-simulated tropospheric NO2 in Asia and comparison with GOME-satellite data |
| VerfasserIn |
I. Uno, Y. He, T. Ohara, K. Yamaji, J.-I. Kurokawa, M. Katayama, Z. Wang, K. Noguchi, S. Hayashida, A. Richter, J. P. Burrows |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 6 ; Nr. 7, no. 6 (2007-03-27), S.1671-1681 |
| Datensatznummer |
250004837
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| Publikation (Nr.) |
 copernicus.org/acp-7-1671-2007.pdf |
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| Zusammenfassung |
| Systematic analyses of interannual and seasonal variations of tropospheric
NO2 vertical column densities (VCDs) based on GOME satellite data and
the regional scale chemical transport model (CTM), Community Multi-scale Air
Quality (CMAQ), are presented for the atmosphere over eastern Asia between
1996 and June 2003. A newly developed year-by-year emission inventory (REAS)
was used in CMAQ. The horizontal distribution of annual averaged GOME
NO2 VCDs generally agrees well with the CMAQ results. However,
CMAQ/REAS results underestimate the GOME retrievals with factors of 2–4
over polluted industrial regions such as Central East China (CEC), a major
part of Korea, Hong Kong, and central and western Japan. The most probable
reasons for the underestimation typically over the CEC are accuracy of the
basic energy statistic data, emission factors, and socio-economic data used
for construction of emission inventory. For the Japan region, GOME and CMAQ
NO2 data show reasonable agreement with respect to interannual
variation and show no clear increasing trend. For CEC, GOME and CMAQ
NO2 data indicate a very rapid increasing trend from 2000. Analyses of
the seasonal cycle of NO2 VCDs show that GOME data have larger dips
than CMAQ NO2 during February–April and September–November.
Sensitivity experiments with fixed emission intensity reveal that the
detection of emission trends from satellite in fall or winter has a larger
error caused by the variability of meteorology. Examination during summer
time and annual averaged NO2 VCDs are robust with respect to
variability of meteorology and are therefore more suitable for analyses of
emission trends. Analysis of recent trends of annual emissions in China
shows that the increasing trends of 1996–1998 and 2000–2002 for GOME and
CMAQ/REAS show good agreement, but the rate of increase by GOME is
approximately 10–11% yr−1 after 2000; it is slightly steeper
than CMAQ/REAS (8–9% yr−1). The greatest difference was
apparent between the years 1998 and 2000: CMAQ/REAS only shows a few
percentage points of increase, whereas GOME gives a greater than 8% yr−1 increase. The exact reason remains unclear, but the most likely
explanation is that the emission trend based on the Chinese emission related
statistics underestimates the rapid growth of emissions. |
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