At a glance
Title: Impact of Biogenic versus
Anthropogenic emissions on Clouds
and Climate: towards a Holistic
UnderStanding
Instrument: FP7 collaborative project
Total Cost: 11.463.091 €
EC Contribution: 8.746.587 €
Duration: 48 months
Start Date: 1 December 2013
Consortium: 20 partners from 12
countries
Project Coordinator: ETH Zürich (CH)
Project Web Site: http://www.aerosols-climate.org/
Key Words: Aerosol-cloudinteractions,
climate feedbacks,
biosphere, VOCs, climate-change,
Arctic, Amazon, ice nucleation, field
studies, satellite studies, long-term
observations, process & earth system
models
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Climate Change
BACCHUS
The challenge
Clouds are a very important, yet not well
understood feedback factor in climate change and
they contribute to the radiative forcing (RF)
through aerosol-cloud interactions (ACI). The
uncertainty caused by this crucial detail of the
climate system is larger than the uncertainty
related to the forcing of other agents. Also,
feedbacks between the terrestrial and marine
biosphere and the atmosphere involving ACI are
thought to play an important role in regulating
climate change but their relevance remains poorly
quantified.
Project Objectives
BACCHUS will quantify key processes and
feedbacks controlling ACI, by combining advanced
measurements of cloud and aerosol properties
with state-of-the-art numerical modelling. The
analysis of contrasting environments will be the
guiding strategy for BACCHUS. We will investigate
the importance of biogenic versus anthropogenic
emissions for ACI in regions that are key
regulators of Earth's climate (Amazonian rain
forest) or are regarded as tipping elements in the
climate system (Arctic).
Capturing the key aerosol-cloud interactions and
feedbacks involving natural and anthropogenic
aerosols in the present climate will reduce the
uncertainty about the impact of biogenic and
anthropogenic emissions on clouds and climate in
future climate projections.
Methodology
BACCHUS will generate a unique database linking
long-term observations and field campaign data of
aerosol, cloud condensation and ice nuclei and
cloud microphysical properties; this will enable a
better quantification of the natural aerosol
concentrations and the anthropogenic aerosol
effect. BACCHUS will advance the understanding of biosphere
aerosol-cloud-climate feedbacks that occur via emission and
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