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An enhanced resolution modelling study on anthropogenic climate change

Objective



Objectives :

To assess the anticipated change in climate after a
doubling of the carbon dioxide concentration in the
atmosphere with special emphasis on the hydrological
cycle and the characteristics of tropical cyclones.

Brief Description of the Research Project :


The project is aiming at the assessment of the
anticipated change in climate after a doubling of the
carbon dioxide (CO2) concentration in the atmosphere by
means of a numerical modelling study employing a state of
the art atmospheric general circulation model (AGCM).
Along with this goes an assessment of the AGCM's
capability in simulating the present day climate
realistically.

The model employed is the ECHAM4 AGCM. The simulations
have been performed at high horizontal resolution, that
is a triangular truncation at zonal wavenumber 106
(T106), so that they include numerous regional features
and, hence, lead to a considerable improvement of the
overall presentation of various aspects of climate in the
model.

We consider three different simulations in the project.
Two of them, covering a period of 30 years each,
represent the present day climate and the climate at a
time, when the CO2 concentration in the atmosphere has
doubled. For these so-called time-slices the lower
boundary fields have been extracted from a simulation
with a low resolution coupled atmosphere-ocean general
circulation model. For the third one, a simulation of the
present day climate covering a period of 16 years, the
lower boundary fields have been constructed from
observational data.

The project concentrates on two fundamental aspects of
climate, namely the hydrological cycle and the
characteristics of tropical cyclones. This accounts for
the fact that the ability of simulating the hydrological
cycle realistically is critical to understanding and
predicting the future climate using an AGCM. Moreover,
the possible change in precipitation and in various kinds
of extreme weather events such as tropical cyclones,
floods and droughts have the most serious consequences
for mankind.

Coordinator

DANISH METEOROLOGICAL INSTITUTE
Address
100,Lyngbyvej 100
2100 Koepenhagen
Denmark

Participants (1)

MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Germany
Address
Bundesstra¯e 55
20146 Hamburg