a case study of the radiative effect of aerosols over europe: eucaari-longrex
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2016
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Abstract
The radiative effect of anthropogenic aerosols over Europe during the 2008
European Integrated Project on Aerosol Cloud Climate and Air Quality
Interactions Long Range Experiment (EUCAARI-LONGREX) campaign has been calculated using measurements collected by
the Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 aircraft and radiative transfer modelling. The aircraft
sampled anthropogenically perturbed air masses across north-western Europe
under anticyclonic conditions with aerosol optical depths ranging from 0.047
to 0.357. For one specially designed “radiative closure” flight, simulated
irradiances have been compared to radiation measurements for a case of aged
European aerosol in order to explore the validity of model assumptions and
the degree of radiative closure that can be attained given the spatial
and temporal variability of the observations and their measurement
uncertainties. Secondly, the diurnally averaged aerosol radiative effect
throughout EUCAARI-LONGREX has been calculated. The surface radiative effect
ranged between −3.9 and −22.8 W m−2 (mean
−11 ± 5 W m−2), whilst top-of-the-atmosphere (TOA) values were
between −2.1 and −12.0 W m−2 (mean −5 ± 3 W m−2).
We have quantified the uncertainties in our calculations due to the way in
which aerosols and other parameters are represented in a radiative transfer
model. The largest uncertainty in the aerosol radiative effect at both the
surface and the TOA comes from the spectral resolution of the information
used in the radiative transfer model (∼ 17 %) and the aerosol
description (composition and size distribution) used in the Mie calculations
of the aerosol optical properties included in the radiative transfer model
(∼ 7 %). The aerosol radiative effect at the TOA is also highly
sensitive to the surface albedo (∼ 12 %).
| Reference Key |
esteve2016atmospherica
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|---|---|
| Authors | ;A. R. Esteve;A. R. Esteve;A. R. Esteve;E. J. Highwood;C. L. Ryder |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-7639-2016
|
| URL | |
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