Dust deposition downwind of Owens (dry) Lake, 1991-1994: Preliminary findings
摘要：
Salt-rich dust derived from the Owens Lake playa is deposited in significant quantities to distances of at least 40 km north and south of the playa. Semiannual measurements from 1991 to 1994 of dust deposition rates (dust flux) and composition 2 m above the ground at seven sites in Owens Valley show that (1) dust in Owens Valley is derived mainly from the playa, although areas closer to the sites can also be sources; (2) south of the playa, dust flux is higher in the winter than in the summer, but north of the playa, dust flux is about the same or slightly lower in the winter; (3) on the playa, interannual variation in dust flux is large (factors of 510 during the 3 years), but at downwind sites, the variation is much smaller; (4) the dust typically has total soluble salt content as high as 30%, generally much higher than that of dust elsewhere in southern Nevada and California; and (5) to a distance of at least 40 km south of the playa, soluble salt flux is significantly higher than regional rates. The dust flux measurements indicate that significant quantities of salt-rich dust are probably being added to the soils in the region around Owens Lake playa; these dust additions may affect soil pH and vegetation.
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关键词：
Experimental/ atmospheric boundary layer dust sedimentation wind/ dust deposition downwind Owens Lake salt-rich dust playa semiannual measurements deposition rates Owens Valley interannual variation soil pH vegetation United States AD 1991 to 1994/ A9260M Particles and aerosols in the lower atmosphere A9260F Atmospheric boundary layer structure and processes A9330H North America A9260G Winds and their effects in the lower atmosphere
DOI：
10.1029/97JD01967
被引量：
年份：
1997
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