HR: 1330h
AN: PP22A-1200    [PDF]
TI: Deuterium and Deuterium Excess in Current Bolivian Precipitation: Towards Improvement in Andean ice Cores Interpretation
AU: * Vimeux, F
EM: vimeux@lsce.saclay.cea.fr
AF: IRD-LSCE, CE Saclay Orme des Merisiers Bat 709, Gif-sur-Yvette, 91191 France
AU: Gallaire, R
EM: rgallaire@mail.megalink.com
AF: IRD, CP9214, La Paz, 00095 Bolivia
AU: Bony, S
EM: sandrine.bony@lmd.jussieu.fr
AF: LMD, 4 place Jussieu, Paris, 75252 France
AB: Two ice cores studies have been carried out in Bolivia (Sajama and Illimani) for the last few years. Although the long term trend of water stable isotopes records clearly reflect well known periods (deglaciation, period associated to the Younger Dryas cooling in the North Atlantic sector, Holocene optimum), the interpretation in terms of climate changes is difficult because of the complexity of the hydrological cycle in the tropics and subtropics (cloud convection, recycling over Amazonia, partial evaporation of droplets at the based of the cloud). Indeed, a remarkable common signal has been pointed out from deuterium records over the last century and the interpretation of such a signal is currently discussed in terms of precipitation amount variations. To better understand the seasonal isotopic signal recorded in those ice cores, we need to calibrate the isotope content of precipitation regarding local and/or regional and/or source meteorological parameters. In this context, a network sampling either each event of precipitation or monthly precipitation has been set up for more than 4 years in Bolivia. We present here analyses for both deuterium and deuterium excess regarding local meteorological data, reanalysis, satellite data and atmospheric general circulation model outputs.
DE: 1655 Water cycles (1836)
DE: 3309 Climatology (1620)
DE: 3354 Precipitation (1854)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2003 Fall Meeting