Spatial and temporal variability of nonmethane hydrocarbon mixing ratios and their relation to photochemical lifetime

被引:80
作者
Jobson, BT
Parrish, DD
Goldan, P
Kuster, W
Fehsenfeld, FC
Blake, DR
Blake, NJ
Niki, H
机构
[1] NOAA, Aeron Lab, Boulder, CO 80303 USA
[2] Univ Calif Irvine, Dept Chem, Irvine, CA 92717 USA
[3] York Univ, Ctr Atmospher Chem, N York, ON M3J 1P3, Canada
[4] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA
关键词
D O I
10.1029/97JD01715
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The relationship between temporal and spatial variability of C-2-C-8 nonmethane hydrocarbon mixing ratios and their HO lifetimes (tau) is presented for samples collected during the 1993 North Atlantic Regional Experiment (NARE) and from other urban and remote sites. The C-2-C-4 alkanes, acetylene and benzene typically define a trend of the form s(lnx) = A tau(-b) where slnx is the standard deviation of the In of the mixing ratio. The relationship extended over a wider range of hydrocarbons in winter. The exponent b ranged in value from 0.28 +/- 0.023 for winter urban data where C-2-C-8 hydrocarbons defined a strongly correlated trend, to 0.56 +/- 0.15 for C2-C4 hydrocarbons at a coastal site in Nova Scotia during NARE. The trends are significantly different from that given by the Junge relationship [Junge, 1974]. Data from the Azores do not display such a trend and were likely influenced by local emissions. Variance trends are a useful analytical tool for examining the validity of hydrocarbon measurements.
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页码:13557 / 13567
页数:11
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