HR: 1330h
AN: PP52A-0949    [PDF]
TI: Climate and Solar Impacts on $^{10}$Be Deposition in ice Cores
AU: * Salyk, C
EM: csalyk@giss.nasa.gov
AF: NASA GISS and Center for Climate Systems Research, Columbia University, 2880 Broadway, New York, NY 10025 United States
AU: Schmidt, G A
EM: gschmidt@giss.nasa.gov
AF: NASA GISS and Center for Climate Systems Research, Columbia University, 2880 Broadway, New York, NY 10025 United States
AU: Koch, D
EM: dorothy.koch@yale.edu
AF: NASA GISS and Center for Climate Systems Research, Columbia University, 2880 Broadway, New York, NY 10025 United States
AU: Veeder, C
EM: christyveeeder@earthlink.net
AF: NASA GISS and Center for Climate Systems Research, Columbia University, 2880 Broadway, New York, NY 10025 United States
AB: $^{10}$Be is a key cosmogenic isotope whose production is modulated by the strength of the solar magnetic field. Since this is correlated with solar irradiance over the satellite observational period, records of $^{10}$Be in ice cores can potentially be used to constrain past variations in solar irradiance. However, the deposition of $^{10}$Be is mediated by atmospheric processes of stratospheric-tropospheric exchange, aerosol transport and the hydrologic cycle. The GISS atmospheric GCM is therefore used to simulate the production, transport and deposition of $^{10}$Be. Various climate changes (including a Younger Dryas-like N. Atl. cooling), and different production functions are used to estimate resulting variations in $^{10}$Be flux and, by accounting for changing snow accumulation over the ice caps, $^{10}$Be concentration in ice cores. Preliminary results show that although production rate changes dominate, climate impacts (particularly in Greenland) can be of the same order of magnitude, complicating the attribution of $^{10}$Be variability to solar effects alone.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 1650 Solar variability
DE: 3344 Paleoclimatology
DE: 7537 Solar and stellar variability
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2003 Fall Meeting