HR: 17:30h
AN: H54C-07    [Abstracts]
TI: Cloud Water Interception at two Tropical Montane Cloud Forest Sites in Hawai'i
AU: * Giambelluca, T W
EM: thomas@hawaii.edu
AF: University of Hawaii at Manoa, Geography Department , Honolulu, HI 96822 United States
AU: DeLay, J K
EM: delay@hawaii.edu
AF: University of Hawaii at Manoa, Geography Department , Honolulu, HI 96822 United States
AU: Nullet, M A
EM: mnullet@hawaii.edu
AF: University of Hawaii at Manoa, Geography Department , Honolulu, HI 96822 United States
AU: Scholl, M A
EM: mascholl@usgs.gov
AF: US Geological Survey, Water Resources Division , Reston, VA 20192 United States
AU: Gingerich, S B
EM: sbginger@usgs.gov
AF: US Geological Survey, Water Resources Division, Honolulu, HI 96813 United States
AB: A preliminary analysis of fog gauge measurements and canopy water balance estimates is presented, based on field measurements at dry (Auwahi) and wet (Waikamoi) cloud forest sites on the Island of Maui. Estimates of cloud water flux are based on fog gauge observations, with corrections for the effects of windblown rainfall and varying wind direction. We estimate event totals of cloud water interception by the vegetation at each site based on throughfall measurements, incident rainfall estimates and calculated evaporation. Measured throughfall was about 65% of incident rainfall at Auwahi, and 119% of incident rainfall at Waikamoi. Throughfall is dominated by rainfall at both sites, and is significantly influenced by fog only at Waikamoi. Fog contributed to water input events at an average frequency of once every two days at Auwahi and about twice in three days at Waikamoi. Cloud water interception was equivalent to 268 mm yr$^{-1}$ at Auwahi and 1073 mm yr$^{-1}$ at Waikamoi. At Auwahi, however, the majority of intercepted water is evaporated from the wet vegetation, never reaching the ground. Cloud water interception is related to fog screen catch and cloud water flux at Waikamoi, but not at Auwahi.
UR: http://water.usgs.gov/nrp/proj.bib/hawaii/maui_fog.htm
DE: 1818 Evapotranspiration
DE: 1833 Hydroclimatology
DE: 1836 Hydrologic budget (1655)
DE: 1884 Water supply
DE: 1894 Instruments and techniques
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting