Impact of Long-Range Dust Transport on Northern California in Spring 2002

Cameron-Smith, P ; Bergmann, D ; Chuang, C ; Bench, G ; Cliff, S ; Kelly, P ; Perry, K ; VanCuren, T

Lawrence Livermore National Laboratory

关键词: Dusts;    Aerosols;    Aerodynamics;    Soils;    Simulation;   

DOI  :  10.2172/15015186
RP-ID  :  UCRL-TR-209597
RP-ID  :  W-7405-ENG-48
RP-ID  :  15015186

美国|英语

来源: UNT Digital Library

【 摘 要 】

It has been well documented that spectacular dust storms in Asia (e.g. the events in 1998 and 2001) can affect the USA through long-range transport of dust across the Pacific. However, our observations and modeling show that the majority of dust at sites in Lassen National Park and Trinity Alps (Northern California) in spring 2002 (a year with no spectacular Asian dust events) is still from long-range intercontinental transport across the Pacific. We implemented the interactive dust emission algorithm of Ginoux et al. (2004) into the LLNL 3-D global atmospheric chemistry and aerosol transport model (IMPACT), then ran the model using a separate tracer for each dust emission region, using hi-resolution (1 x 1 degree) meteorological data from the NASA GMAO GEOS-3 assimilation system for 2001 and 2002. We also experimentally analyzed size- and time-resolved aerosol samples at Lassen National Park and Trinity Alps in the spring of 2002, which were taken as part of NOAA's ITCT 2k2 measurement campaign. The model-predicted time-series of soil dust over Northern California agrees remarkably well with our measurements, with a strong temporal correlation between the observations and intercontinental transport of dust across the Pacific in the model. Hence, we conclude that the majority of dust we sampled in Northern California in spring 2002, with aerodynamic diameters of 0.56-5 microns, is from long-range intercontinental transport across the Pacific. The strong correlations also strongly validate atmospheric transport in the IMPACT model over the Northern Pacific in spring.