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Content archived on 2024-05-14

Indirect radiative forcing due to aerosols over the North Atlantic region.

Objective


Cloudy-Column is one of five projects which constitute the European contribution to the second Aerosol Characterisation Experiment (ACE-2) of the International Global Atmospheric Chemistry Project (IGAC). Cloudy-Column is specifically dedicated to the study of the indirect effect. The objective is to develop parameterisations of marine extended stratocumulus for climate models, that include explicitly the characteristics of the aerosol background and their effects on cloud radiative properties.


For the experimental phase, a field experiment will be conducted from the Tenorrhaphy island. It is based on
simultaneous airborne measurements of the aerosol characteristics in the boundary layer, of cloud microphysical
properties of stratocumulus and of their radiative properties. The instrumented aircraft will be equipped with
a MAP and a Fast FSSP (Meteo-France Merlin-IV) for measurements of the interstitial aerosols and droplet size
distributions and with POLDER and OVID (DLR Falcon-20) for radiative measurements.
Various conditions with pure marine air, continental dust from Africa and polluted air from Europe will be
documented in order to quantify the sensitivity of cloud radiative properties to the aerosol characteristics.
A column closure experiment will be performed to validate
parameterisations that describe the links between
aerosol and cloud radiative properties, such as activation of condensation nuclei, droplet growth and spatial
distribution, and resulting radiative properties. Numerical schemes of these processes will be improved and
tested.
The parameterisations will then be integrated in a mesoscale model for upscaling from the cloud scale to the
scale of an ensemble of clouds for the development of parameterisations suitable for climate models.
Finally, the project will be supported by a climatological study of the spatial and temporal distribution of
aerosols based on the POLDER-ADEOS products. The classification of aerosol characteristics from clear air
images and the radiative properties of clouds in the same area will be used for the generalisation of the results
obtained in the region of Tenorrhaphy to the whole North Atlantic region.

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Coordinator

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
EU contribution
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Address
Avenue Gustave Coriolis 42, C.N.R. MTtTorologique
31057 TOULOUSE
France

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Total cost

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Participants (7)

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