HALO Scientific Scope
The HALO aircraft will represent a major improvement in the airborne
research capability for research institutes and universities to study
atmospheric phenomena and their interactions from local to global
scales. Aircraft measurements are particularly valuable to describe
processes at the scales of transport and photochemistry. The observed
spatial variability in clouds, aerosols, water vapour and ozone, for
example, ranges from less than 100 m (turbulence) to more than 1000 km
(synoptic weather systems). Since oxidation processes in the atmosphere
proceed through radical reaction chains, chemical measurements must
typically be performed at a time resolution of seconds to minutes.
Because of its relatively large size, HALO will facilitate the deployment
of comprehensive sets of instrumentation, as developed within Germany or
elsewhere, to simultaneously measure physical and chemical parameters to
characterise transport, radiation and chemical processes. Furthermore,
the long range and high altitude performance will greatly increase the
fraction of the global atmosphere in which fundamental physical and
chemical processes can be directly observed.
Intensive field measurement campaigns are being planned that involve a
large number of institutions and universities. The aim is to reduce
uncertainties in the understanding of crucial atmospheric processes,
A more detailed description on the Scientific Questions to be addressed
with HALO can be found in the
HALO - proposal submitted the Federal Ministry
for Education and Research,
the Questionnaire prepared for the German Science Council and The
Scientific Achievements laid down by the Scientific Steering Committee of HALO.
A brochure on HALO and its planned research activities can also be downloaded
from the link below.
- The influence of aerosol particles on cloud microphysical and radiation processes;
- The role of vertical exchange processes within the troposphere and between the troposphere and stratosphere;
- The chemistry of the upper troposphere and lower stratosphere, and the influence of aircraft emissions;
- The role of cirrus clouds (and aircraft condensation trails) in radiation transfer, climate and atmospheric chemistry;
- Oxidation and aerosol physical-chemical processes in the tropical troposphere;
- Long-range transport of pollutants that affect regional and global air quality and climate.