HR: 0800h
AN: C21C-1109    [Abstracts]
TI: A simple bias-correction procedure to estimate false precipitation due to blowing snow flux into the precipitation gauge
AU: * Sugiura, K
EM: sugiura@jamstec.go.jp
AF: Institute of Observational Research for Global Change, JAMSTEC, 2-15, Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Ohata, T
EM: ohatat@jasmtec.go.jp
AF: Institute of Observational Research for Global Change, JAMSTEC, 2-15, Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Yang, D
EM: ffdy@uaf.edu
AF: Water and Environmental Research Center, University of Alaska Fairbanks, 457 Duckering Building, Fairbanks, AK 99775-5860 United States
AB: Gauge-measured solid precipitation has systematic errors caused by wind-induced undercatch, wetting loss, evaporation loss, trace precipitation loss and blowing snow. The need to correct these biases has now been more widely acknowledged. In this presentation, bias-correction procedures for gauge-measured solid precipitation in high-wind regions are considered. Using the solid precipitation data with various precipitation gauges installed at Barrow, Alaska, in accordance with the WMO precipitation procedures, the catch ratio of the precipitation gauge to the DFIR (Double Fence Intercomparison Reference) was analyzed on a daily basis. Although the daily catch ratio decreased rapidly with increasing wind speed, the daily catch ratio was considerably scattered under strong wind conditions due to blowing snow. A simple bias-correction procedure physically based on saltation and suspension processes in blowing snow and suitable for high-wind regions is proposed for estimating the amount of false precipitation due to blowing snow flux into the precipitation gauge. It was shown that the scatter of the daily catch ratio under strong wind conditions is correctable and systematic errors are predicted. Further efforts are needed in order to confirm the validity of the bias-correction procedure for false precipitation through field experiments.
DE: 0736 Snow (1827, 1863)
DE: 0776 Glaciology (1621, 1827, 1863)
DE: 1833 Hydroclimatology
DE: 1836 Hydrological cycles and budgets (1218, 1655)
DE: 1854 Precipitation (3354)
SC: Cryosphere [C]
MN: Fall Meeting 2005