HR: 1340h
AN: PP33C-1588    [Abstracts]
TI: Stable isotopes in precipitation and frost during the wintering at Dome Fuji, east Antarctica 2003
AU: * Fujita, K
EM: cozy@nagoya-u.jp
AF: Graduate School of Environmental Studies, Nagoya University, Chikusa-ku, Nagoya, 464-8601 Japan
AB: Stable isotopes in ice are the most familiar index of temperature in ice core study and the relation between stable isotopes in deposited snow and temperature has been studied in many previous studies. However, observations of stable isotopes in precipitation (not deposited snow) were few. Stable isotopes in precipitation and frost during the wintering during 2003 at Dome Fuji, east Antarctica were collected and analyzed in this study. Precipitation samples were collected at the height of 2 m from the surface nearly every day. Total amount of precipitation is 28 mm water equivalent, which coincides with surface accumulation measured by the stake network near the station. Stable isotopes show clear seasonal fluctuation correlating with air temperature. The minimum values of oxygen and hydrogen isotopes are about -80 and -600 per mil, respectively, which are the lowest values observed ever. Although stable isotopes in frost show no clear difference from those of precipitation, d-excess in frost shows different fluctuation from that of precipitation. D-excess in frost is higher in summer and lower in winter than that of precipitation. This difference is due to the height of precipitation formation since the frost would directly condensed from vapor near the surface, whereas the height where the precipitation was formed would change with vertical profile of air temperature.
DE: 0724 Ice cores (4932)
DE: 0726 Ice sheets
DE: 0736 Snow (1827, 1863)
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005