 |
| Titel |
Simulation of the interannual variations of aerosols in China: role of variations in meteorological parameters |
| VerfasserIn |
Q. Mu, H. Liao |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 18 ; Nr. 14, no. 18 (2014-09-16), S.9597-9612 |
| Datensatznummer |
250119030
|
| Publikation (Nr.) |
 copernicus.org/acp-14-9597-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| We used the nested grid version of the global three-dimensional Goddard Earth
Observing System chemical transport model (GEOS-Chem) to examine the
interannual variations (IAVs) of aerosols over heavily polluted regions in
China for years 2004–2012. The role of variations in meteorological
parameters was quantified by a simulation with fixed anthropogenic emissions
at year 2006 levels and changes in meteorological parameters over 2004–2012.
Simulated PM2.5 (particles with a diameter of 2.5 μm or less)
aerosol concentrations exhibited large IAVs in North China (NC;
32–42° N, 110–120° E), with regionally averaged absolute
percent departure from the mean (APDM) values of 17, 14, 14, and 11% in
December-January-February (DJF), March-April-May (MAM),
June-July-August (JJA), and September-October-November (SON), respectively.
Over South China (SC; 22–32° N, 110–120° E), the IAVs in
PM2.5 were found to be the largest in JJA, with the regional mean APDM
values of 14% in JJA and of about 9% in other seasons.
The concentrations of PM2.5 over the Sichuan Basin (SCB; 27–33° N,
102–110° E) were simulated to have the smallest IAVs among the
polluted regions examined in this work, with APDM values of 8–9%
in all seasons. All aerosol species (sulfate, nitrate, ammonium, black
carbon, and organic carbon) were simulated to have the largest IAVs over NC
in DJF, corresponding to the large variations in meteorological parameters
over NC in this season. Process analyses were performed to identify the key
meteorological parameters that determined the IAVs of different aerosol
species in different regions. While the variations in temperature and
specific humidity, which influenced the gas-phase formation of sulfate,
jointly determined the IAVs of sulfate over NC in both DJF and JJA, wind (or
convergence of wind) in DJF and precipitation in JJA were the dominant
meteorological factors to influence IAVs of sulfate over SC and the SCB. The
IAVs in temperature and specific humidity influenced gas-to-aerosol
partitioning, which were the major factors that led to the IAVs of nitrate
aerosol in China. The IAVs in wind and precipitation were found to drive the
IAVs of organic carbon aerosol. We also compared the IAVs of aerosols
simulated with variations in meteorological parameters alone with those
simulated with variations in anthropogenic emissions alone; the variations in
meteorological fields were found to dominate the IAVs of aerosols in northern
and southern China over 2004–2012. Considering that the IAVs in
meteorological fields are mainly associated with natural variability in the
climate system, the IAVs in aerosol concentrations driven by meteorological
parameters have important implications for the effectiveness of short-term
air quality control strategies in China. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|