Interhemispheric differences in cirrus properties from anthropogenic
The EU-INCA Project Team
||Deutsches Zentrum für Luft- und Raumfahrt
||Laboratoire de Météorologie Physique
||Laboratoire de Météorologie Dynamique du CNRS
||University of Helsinki
||Norwegian Institute for Air Research
Background of the Partners
Stockholm University is the only institute in Europe that operates a counterflow
virtual impactor (CVI) that is optimised for high clouds. The CVI is presently
the only device available to obtain information in-situ about the properties
of particles incorporated into the crystals.
Laboratoire de Météorologie Physique is the only institute
in the world operating a Polar nephelometer capable of determining the
phase and scattering properties of cirrus crystals in-situ. Combining this
information with the spectral measurements of ice crystals using other
optical probes and the direct measurement of condensed cloud water using
the CVI, a strong closure of the cirrus properties can be acquired.
In Europe, the Falcon aircraft is the only platform suitable to use for
the objectives of the INCA project. No other European institute has more
experience than the Atmospheric Physics department at DLR in conducting
in-situ aerosol and trace gas measurements from the Falcon aircraft. A
workshop will be organised in 2000, after the first campaign, to
discuss the observations and their modelling and interpretation with interested
partners from the modelling community.
Water vapour is perhaps the most fundamental species in atmospheric science,
but still one of the hardest to observe. In Europe there are two or three
groups that are capable of measuring water vapour accurately in the tropopause
region. Laboratoire de Météorologie Dynamique at CNRS is
one of these institutes.
The Norwegian institute for air research has successfully provided chemical
forecasts in several previous airborne experiments, partly in cooperation
with other INCA team members. This operative support has been developed
into an extremely useful flight-planing tool, which is distributed via
the Internet for easy access. Supplying the forecasts during the campaigns
and providing the analysed fields after the campaigns is important support
for a successful campaign.
The department of Physics at University of Helsinki, one of Europe’s leading
institutes in numerical simulations of particle and ice nucleation, is
part of the consortium. Together with the other partners, the main objective
of UHEL is to synthesis the observations into a form that is functional
and easily accessible to a broad category of different models.