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| Titel |
Can a coupled meteorology–chemistry model reproduce the historical trend in aerosol direct radiative effects over the Northern Hemisphere? |
| VerfasserIn |
J. Xing, R. Mathur, J. Pleim, C. Hogrefe, C.-M. Gan, D. C. Wong, C. Wei |
| 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 ; 15, no. 17 ; Nr. 15, no. 17 (2015-09-07), S.9997-10018 |
| Datensatznummer |
250120019
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| Publikation (Nr.) |
 copernicus.org/acp-15-9997-2015.pdf |
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| Zusammenfassung |
| The ability of a coupled meteorology–chemistry model,
i.e., Weather Research and Forecast and Community Multiscale Air Quality
(WRF-CMAQ), to reproduce the historical trend in aerosol optical
depth (AOD)
and clear-sky shortwave radiation (SWR) over the Northern Hemisphere has been
evaluated through a comparison of 21-year simulated results with
observation-derived records from 1990 to 2010. Six satellite-retrieved AOD
products including AVHRR, TOMS, SeaWiFS, MISR, MODIS-Terra and MODIS-Aqua as
well as long-term historical records from 11 AERONET sites were used for the
comparison of AOD trends. Clear-sky SWR products derived by CERES at both the
top of atmosphere (TOA) and surface as well as surface SWR data derived from
seven SURFRAD sites were used for the comparison of trends in SWR. The model
successfully captured increasing AOD trends along with the corresponding
increased TOA SWR (upwelling) and decreased surface SWR (downwelling) in both
eastern China and the northern Pacific. The model also captured declining AOD
trends along with the corresponding decreased TOA SWR (upwelling) and
increased surface SWR (downwelling) in the eastern US, Europe and the
northern Atlantic for the period of 2000–2010. However, the model
underestimated the AOD over regions with substantial natural dust aerosol
contributions, such as the Sahara Desert, Arabian Desert, central Atlantic
and northern Indian Ocean. Estimates of the aerosol direct radiative effect
(DRE) at TOA are comparable with those derived by measurements. Compared to
global climate models (GCMs), the model exhibits better estimates of
surface-aerosol direct radiative efficiency (Eτ). However,
surface-DRE tends to be underestimated due to the underestimated AOD in land
and dust regions. Further investigation of TOA-Eτ estimations as
well as the dust module used for estimates of windblown-dust emissions is
needed. |
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