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| Titel |
The mass and number size distributions of black carbon aerosol over Europe |
| VerfasserIn |
C. L. Reddington, G. McMeeking, G. W. Mann, H. Coe, M. G. Frontoso, D. Liu, M. Flynn, D. V. Spracklen, K. S. Carslaw |
| 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 ; 13, no. 9 ; Nr. 13, no. 9 (2013-05-14), S.4917-4939 |
| Datensatznummer |
250018649
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| Publikation (Nr.) |
 copernicus.org/acp-13-4917-2013.pdf |
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| Zusammenfassung |
| Black carbon-containing aerosol particles play an important role in the
direct and indirect radiative forcing of climate. However, the magnitude and
sign of the net radiative effect is strongly dependent on the physical
properties of the black carbon (BC) component of the particles, such as mass
concentration, number size distribution and mixing state. Here we use a
global aerosol model combined with aircraft measurements of BC particle
number and size from the Single Particle Soot Photometer (SP2) to assess the
realism with which these physical properties are predicted by global models.
The comparison reveals a substantial mismatch between the measured and
modelled BC size distribution over the size range of the SP2 instrument
(90–400 nm BC diameter). The model predicts BC particle number
concentrations a factor ~3.5–5.7 higher than measured and a mode
diameter that is ~40–65 nm smaller than observed. More than
~90% of the model particles with dry diameters ≳260 nm
contain BC, while the observations suggest only 14% on average. These
model–observation biases in the BC properties are considerably greater than
for the overall particle distribution, suggesting that the discrepancy is
associated with model assumptions about the size and mixing state of the
emitted carbonaceous particles. We expect the discrepancy in BC size
distribution to be common among most global aerosol models, with implications
for model estimates of absorption optical depth and direct radiative forcing. |
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