HR: 0800h
AN: C51B-1034    [Abstracts]
TI: SWING - The Stable Water Isotope Intercomparison Group
AU: * Werner, M
EM: martin.werner@bgc-jena.mpg.de
AF: Max-Planck-Institute for Biogeochemistry, P.O.Box 100164, Jena, 07743 Germany
AU: Barras, V
EM: vbarras@earthsci.unimelb.edu.au
AF: University of Melbourne, Parkville, Victoria, 3010 Australia
AU: Brown, J
EM: josephine.brown@reading.ac.uk
AF: University of Reading, P.O.Box 243, Reading, RG6 6BB United Kingdom
AU: Gourcy, L
EM: L.Gourcy@iaea.org
AF: International Atomic Energy Agency, P.B.Box 100, Vienna, 1400 Austria
AU: Henderson-Sellers, A
EM: ahssec@ansto.gov.au
AF: ANSTO Environment, PMB 1, Menai, NSW 2234 Australia
AU: Hoffmann, G
EM: hoffmann@lsce.saclay.cea.fr
AF: LSCE, D.S.M. / Orme des Merisiers / Bat. 701 C.E. Saclay, Gif-sur-Yvette, 91191 France
AU: Ichiyanagi, K
EM: kimpei@jamstec.go.jp
AF: Frontier Observational Research System for Global Change, 3173-25, Showa-machi, Kanazawa-ku, Yokohama-city, Kanagawa, 236-0001 Japan
AU: Kelley, M
EM: kelley@giss.nasa.gov
AF: LSCE, D.S.M. / Orme des Merisiers / Bat. 701 C.E. Saclay, Gif-sur-Yvette, 91191 France
AU: Noone, D
EM: dcn@colorado.edu
AF: University of Colorado, Stadium 255-10 (Gate 7), Boulder, 80309 United States
AU: Roads, J
EM: jroads@ucsd.edu
AF: USCD, SIO/NH 441 8810 Shellback Way, La Jolla, CA 92037 United States
AU: Schmidt, G
EM: gschmidt@giss.nasa.gov
AF: NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025 United States
AU: Sturm, K
EM: sturm@lgge.obs.ujf-grenoble.fr
AF: LGGE, 54 rue MoliŠre - BP 96, Saint-Martin d'Heres, 38402 France
AU: Tindall, J
EM: Julia.Tindall@bristol.ac.uk
AF: University of Bristol, University Road, Bristol, BS8 1SS United Kingdom
AU: Valdes, P
EM: P.J.Valdes@bristol.ac.uk
AF: University of Bristol, University Road, Bristol, BS8 1SS United Kingdom
AU: Yoshimura, K
EM: kei@iis.u-tokyo.ac.jp
AF: University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505 Japan
AU: Zakharov, V
EM: vz@uraltc.ru
AF: The Ural State University, 51 Lenin Avenue, Ekaterinburg, 620083 Russian Federation
AB: For more than four decades the isotopic composition of water stored in various archives (e.g. ice cores, ground water) has been used to study changes in the hydrological cycle on timescales from glacial-interglacial to short term variations. However, the interpretation of isotopic variations in terms of climate change is often handicapped by a lack of other relevant observational climate parameters (e.g. temperature, relative humidity, precipitation) both in space and time. Modeling the isotopic composition of water within the hydrological cycle of general circulation models (GCM) may help to overcome this deficit on available climate data. Isotope GCMs simulate the 18O/16O (and/or 2H/1H) relation as an independent quantity within a closed "model world" where all other relevant climate parameters are known, too. This enables an improved analysis of (simulated) isotope variability in terms of climate change and during the last decade several state-of-the-art GCM models (GISS, ECHAM, LMD, GENESIS and others) have been enhanced by the capability to simulate the atmospheric and/or ocean cycle of H218O and 1H2H16O. To ensure isotope GCM reliability, any isotope GCM simulation must pass a rigorous comparison of simulated versus observed isotope data (model-data-intercomparison). In addition, artifacts in isotope simulations based on a specific GCM model parameterization or set-up have to be identified by comparing simulation results of several different isotope GCMs (model-model intercomparison). In our presentation we will give an overview and first results of the SWING project, founded in 2004. This initiative serves as a community platform for experts from the various isotope research groups and has the following objectives: (1) enable an overview about ongoing isotope GCM modeling capabilities; (2) define and perform future common GCM isotope simulation experiments of the various research groups; (3) identify the most important need of new observational isotope data in space, time and the various aggregate forms of water; (4) strengthen the linkage between the modeling community and the key contributors of observational water isotope data; (5) serve as an interface to other model intercomparison studies.
UR: http://www.bgc-jena.mpg.de/projects/SWING
DE: 3309 Climatology (1620)
DE: 1655 Water cycles (1836)
DE: 1854 Precipitation (3354)
DE: 1610 Atmosphere (0315, 0325)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting