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Study of the indirect and direct climate influences of anthropogenic trace gas emissions

Objetivo

To study the atmospheric part of the global biochemical cycles of
methane, nitogene and sulfur species, and to estimate their
direct and indirect climate forcings due to chemical feedbacks
e.~g. through ozone and sulfate aerosol on regional and global
scales.


Assesment of the regional distributions of the methane sources
and source strengths will be achieved by "inverse modelling"
using global three--dimensional tracer transport models (TM2 and
MOGUNTIA) and global observations.

Atmospheric chemistry models will be further developed to
be able to calculate distributions of sulfur species, the methane
cycle, taking into account the role of CO, NOx and several
hydrocarbons. The models will be based on the transport models
TM2 and MOGUNTIA.

A scheme for radiation calculation of atmosphereic radiation for
use in the three--dimensional climate model ECHAM will be
developed. It will be based on the Morcrette scheme, which is
used in the ECMWF operational weather prediction model. A code
will be developed, which will treat the trace gases
independedntly, and which will take into account the optical
properties of aerosols. The scheme will be compared with detailed
line--by--line calculations. A scheme for treating aerosols in
the MOGUNTIA model will be developed, based on earlier work on
the sulfur cycle. For use in the ECHAM model, a parametrization
will be developed to describe the major aerosol influence on
cloud microstructure and the optical properties of clouds.

The ECHAM model will be applied to estimate the indirect cooling
effect of ozone depletion. Also, the ECHAM model, coupled with a
MPI ocean model, will be applied to study the climatic responses
to perturbations in the radiative fluxes by alteration of
concentrations of methane, sulfate and ozone. Program modules
developed by the individual participants will be implemented in
ECHAM and several sensitivity studies performed. Results of these
studies will be used to improve the TM2 and MOGUNTIA models.

Model results will be validated through comparison with trace gas
measurements from monitoring networks, precipitation statistics,
precipitation chemical composition, aerosol climatologies from
in--situ and remote sensing data, and with satellite data on
aerosol and cloud optical depths and liquid water path. Much of
the work will be done in collaboration with the Center for
Clouds, Chemistry and Climate (C4) in the USA.

Ámbito científico

Programa(s)

Tema(s)

Convocatoria de propuestas

Data not available

Régimen de financiación

CSC - Cost-sharing contracts

Coordinador

MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Aportación de la UE
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Dirección
Bundesstra¯e 55
20146 HAMBURG
Alemania

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Coste total
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Participantes (5)

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Última actualización: 1 Abril 1996

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Permalink: https://cordis.europa.eu/project/id/EV5V0122/es

European Union, 2024