Variations of O3 and CO in summertime at a rural site near Beijing
[摘要] Large intra-season differences in mixing ratios of CO and O3 weredetected at Miyun, a rural site north of Beijing, in summer 2006. Despite anincrease in mean daytime mixing ratio of CO from 500 ppbv in June to 700ppbv in July, mean daytime O3 dropped from 67 ppbv in June to 50 ppbvin July and August. The observed changes in CO and O3 are attributed tothe influence of the summer monsoonal circulation that develops over theNorth China Plain in July. Photochemical production of O3 is reduced asa consequence of increased cloudiness during July and August, as indicatedby the strong negative correlation observed between O3 and satelliteobservations of cloud optical depth, with cloudiness having little effect onCO. The analysis suggests a strategy for emission controls that could beimplemented in an economically efficient manner to minimize the frequency ofhigh levels of O3 during summer in Beijing.
[发布日期] [发布机构]
[效力级别] [学科分类] 大气科学
[关键词] [时效性]
