 |
| Titel |
The radiative effect of aerosols over Europe during the EUCAARI-LONGREX campaign |
| VerfasserIn |
Anna R. Esteve, Ellie Highwood, William T. Morgan, Hugh Coe, Phil Brown, Kate Szpek, J. Antonio Martínez-Lozano |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250092187
|
| Publikation (Nr.) |
 EGU/EGU2014-6515.pdf |
|
|
|
|
|
| Zusammenfassung |
| Atmospheric aerosols affect the Earth’s climate both directly, through the scattering and
absorption of radiation, and indirectly, via changes to cloud microphysics and properties. The
resultant change in net radiation (radiative forcing) is still characterized by a great
uncertainty, both at regional and global scales, due to the variability of the optical properties
and the spatial - temporal distribution of the aerosols.
Here, we calculate the radiative effect of anthropogenic aerosols over Europe using the
data collected by the Facility for Airborne Atmospheric Measurements (FAAM)
BAe-146 aircraft during the European Integrated Project on Aerosol Cloud Climate and
Air Quality Interactions Long Range Experiment (EUCAARI-LONGREX). The
EUCAARI-LONGREX campaign consisted of 15 flights over central Europe or off the
UK coast (47 - 57°N and 12°W - 22°E) during May 2008, designed to map
the aerosol concentrations and properties over Europe, with a particular focus on
observing long range transport of aerosol properties, as well as changes in those
properties. The instrumentation aboard the FAAM BAe-146 aircraft allowed the
measurement of the chemical composition, microphysical, optical and hygroscopic
properties of the atmospheric aerosols, as well as the upwelling and downwelling
radiation. We have also quantified here the uncertainties in our calculations due to the
variability of aerosol concentration and properties and the way in which they are
represented in models. For our calculations of the direct aerosol radiative effect, we use
the composition and microphysical measurements together with the Edwards and
Slingo radiative transfer model to estimate irradiances from 0.2 to 10 μm. Vertical
profiles of temperature, aerosol, water vapour and ozone are taken from the aircraft
measurements. The modelled irradiances have been compared to the radiation data from
flight b374 of the FAAM BAe-146 aircraft in order to evaluate the validity of model
assumptions and the degree of “radiative closure” that can be achieved in a case of
aged European aerosol. Our results provide a description of the radiative effect of
aerosols of different ages over Europe which could be later employed to assess the
sensitivity of climate response to the representation of aerosols in climate models. |
|
|
|
|
|
|