Arid
DOI10.1029/2001JD001446
Dry deposition of airborne trace metals on the Los Angeles Basin and adjacent coastal waters
Lu, R; Turco, RP; Stolzenbach, K; Friedlander, SK; Xiong, C; Schiff, K; Tiefenthaler, L; Wang, GY
通讯作者Lu, R
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2003
卷号108期号:D2
英文摘要

We present an assessment of the deposition rates of airborne trace metals onto the Los Angeles Basin and adjacent coastal waters. For this purpose, the UCLA Surface Meteorology and Ozone Generation (SMOG) air pollution modeling system has been used to simulate the geographical distributions of trace metals and their deposition fluxes. Calculations were performed for average summer and winter conditions, as well as for extreme meteorological events, in particular, for Santa Ana winds. Thus, a series of simulations were carried out that define the range of meteorological conditions contributing to dry deposition in the region. These predictions have been calibrated and validated using measurements collected in the LA area. Significant spatial and temporal variability are found in trace metal concentrations and deposition rates. Large spatial gradients occur near the coast as well as at the mountainous boundaries of the airshed. Considerable diurnal and seasonal variations in trace metal deposition are also noted. For example, the development of a daytime sea breeze, particularly in the warmer months, leads to greater deposition in the northern and eastern basin as well as in the high desert. A nighttime land breeze, especially in the colder months, enhances deposition onto coastal ocean surfaces. Large particles dominate local trace metal deposition in central urban ( and adjacent) areas, while fine particles export metals over regional scales through long-range advection. Since the majority of urban metal deposition occurs on particles larger than 10-mum diameter, routine measurements of PM10 or PM2.5 concentrations for air quality characterization may not be reliable indicators of local sources. Some 35-45% of all trace metal emissions are deposited locally within the Los Angeles Basin on an annual basis. Santa Monica Bay and its watersheds receive about 6% of this amount, which can have a significant impact on trace metal concentrations in the surface waters of the bay, primarily through land runoff following storms.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000182897200008
WOS关键词POLLUTION MODELING SYSTEM ; POLYCYCLIC AROMATIC-HYDROCARBONS ; SOUTHERN LAKE-MICHIGAN ; AIR-POLLUTION ; SIZE DISTRIBUTIONS ; ATMOSPHERIC DEPOSITION ; PARTICLE DEPOSITION ; PHASE SIMULATIONS ; REGIONAL SCALES ; SURFACE SAMPLER
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
来源机构University of California, Los Angeles
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/145190
作者单位(1)Univ Calif Los Angeles, Inst Environm, Los Angeles, CA 90024 USA;(2)So Calif Coastal Water Res Project, Westminster, CA USA;(3)Santa Monica Bay Restorat Project, Los Angeles, CA USA
推荐引用方式
GB/T 7714
Lu, R,Turco, RP,Stolzenbach, K,et al. Dry deposition of airborne trace metals on the Los Angeles Basin and adjacent coastal waters[J]. University of California, Los Angeles,2003,108(D2).
APA Lu, R.,Turco, RP.,Stolzenbach, K.,Friedlander, SK.,Xiong, C.,...&Wang, GY.(2003).Dry deposition of airborne trace metals on the Los Angeles Basin and adjacent coastal waters.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,108(D2).
MLA Lu, R,et al."Dry deposition of airborne trace metals on the Los Angeles Basin and adjacent coastal waters".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 108.D2(2003).
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