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North-south climatic connection and carbon cycle over the last 250 kyr.

Ziel


To analyse the climate signals in Greenland and Antarctic ice cores, and to study North-South climatic connections and their dynamics.


The project consists of three parts: Further studies of ice core data, in particular based on the GRIP core,
modelling the isotopic composition of precipitation to help in the interpretation of the ice core signals, and
climate and carbon cycle modelling to analyse the mechanisms of North-South climatic connections.
The ice core analyses will include study of possible chemical transformations altering the isotopic composition
of CO2 in the GRIP core, and further analysis of the isotopic composition, trace gases and dust contents. From
these data the climatic forcings and conditions (temperature changes) will be refined and compared with other
proxy data (in particular the oceanic records). Special attention will be placed on the correlation and phasing
of the signals between North and South, and on abrupt changes, and on estimates of climate sensitivity based
on the simultaneous records of forcing factors and temperature.
A detailed modelling study will be performed to better quantify the ice core palaeothermometer (Oxygen and
Deuterium isotopic contents). This study will be based on the direct simulation of the isotopes in GCMs, and
will include the use of finer grid GCMs (NASA/GISS, LMD and ECHAM model versions).
Mechanisms responsible for North-South long term climate connections will be analysed with the LLN two
dimensional (zonally averaged) climate model. Specific questions that will be addressed are the role of the
external forcings, greenhouse gases, land-ice and sea-level connection etc. A relatively simple biospheric carbon
cycle submodel will be used to study feedback to the physical climate system. Explicit inclusion of isotopic
contents (in particular 13C) will be used to compare with observational data. Related to these studies will be the
development of continental biospheric carbon cycle and vegetation (sub)models. These will be used to study
vegetation changes related to climatic changes and including albedo feedbacks.

Programm/Programme

Thema/Themen

Aufforderung zur Vorschlagseinreichung

Data not available

Finanzierungsplan

CSC - Cost-sharing contracts

Koordinator

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
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Rue Molière 54, Université de Grenoble 1
38402 SAINT-MARTIN-D'HERES
Frankreich

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Letzte Aktualisierung: 8 Oktober 1998

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Permalink: https://cordis.europa.eu/project/id/ENV4950130/de

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