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| Titel |
Seasonality of Particulate Matter Enhancement by Aerosol Climate Effect in East Asia |
| VerfasserIn |
Xin Zhang, Qiang Zhang |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149226
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| Publikation (Nr.) |
 EGU/EGU2017-13559.pdf |
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| Zusammenfassung |
| A fully online coupled Weather Research and Forecasting model with Chemistry
(WRF-Chem) is used to identify impacts of aerosol climate feedback in East Asia in different
seasons in 2014. Simulation results could successfully capture both spatial and temporal
distribution of temperature, relative humidity, wind speed and particulate matter
concentration. Direct and semi-direct climate effect of aerosols could reduce monthly mean
values of surface heat flux, temperature, wind speed, and planetary boundary layer height by
up to 27 W/m3, 1.0K, 0.1m/s, and 160m respectively, yet increase relative humidity by
up to 4%. Meanwhile, indirect effect of aerosols plays a more important role in
suppressing precipitation. Direct and semi-direct effects is more crucial in modulating
PM2.5 with a maximum enhancement of over 50 μg/m3 ,comparing with a minor
effect from indirect feedback which is within 3 μg/m3. Enhancement by species is
different in four seasons. In moist seasons (spring, summer, and autumn), nitrate
composed a higher proportion in enhanced concentrations (36.7%, 32.6%, and 37.8%)
comparing to the concentration in non-feedback simulation (23.6%, 21.1%, and
24.6%). Correspondingly, percentage of sulfate drops from 14.2%, 18.9%, and 13.2%
to 3.5%, 7.1%, and 4.2% respectively. This could possibly results from rising of
relative humidity which may influence various chemical processes in moist seasons. |
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