Aircraft observations of aerosols, O3 and NOy in a nighttime urban plume

被引:14
作者
Berkowitz, CM [1 ]
Zaveri, RA [1 ]
Bian, XD [1 ]
Zhong, SY [1 ]
Disselkamp, RS [1 ]
Laulainen, NS [1 ]
Chapman, EG [1 ]
机构
[1] Pacific NW Natl Lab, Richland, WA 99352 USA
关键词
ozone; aerosols; heterogeneous chemistry; nighttime chemistry; urban plume; air pollution;
D O I
10.1016/S1352-2310(00)00521-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nighttime measurements of aerosol surface area, O-3, NOy and moisture were made downwind of Portland, Oregon, as part of a study to characterize the chemistry in a nocturnal urban plume. Air parcels sampled within the urban plume soon after sunset. had positive correlations between O-3, relative humidity, NOy and aerosol number density. However, the air parcels sampled within the urban plume just before dawn had O-3 mixing ratios that were highly anti-correlated with aerosol number density, NOy and relative humidity. Bank-trajectories from a mesoscale model show that both the post-sunset and pre-dawn parcels came from a common maritime source to the northwest of Portland. The pre-dawn parcels with strong anti-correlations passed directly over Portland in contrast to the other parcels that were found to pass west of Portland. Several gas-phase mechanisms and a heterogeneous mechanism involving the loss of O-3 to the aerosol surface, are examined to explain the observed depletion in O-3 within the pre-dawn parcels that had passed over Portland. Published by Elsevier Science Ltd.
引用
收藏
页码:2395 / 2404
页数:10
相关论文
共 33 条
[31]   A new lumped structure photochemical mechanism for large-scale applications [J].
Zaveri, RA ;
Peters, LK .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1999, 104 (D23) :30387-30415
[32]  
ZHANG Y, 1994, J APPL METEOROL, V33, P813, DOI 10.1175/1520-0450(1994)033<0813:POPITP>2.0.CO
[33]  
2