北京市与香河县大气臭氧及氮氧化合物的变化特征
CHARACTERISTICS OF OZONE AND OXIDES OF NITROGEN IN BEIJING AND XIANGHE
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摘要: 于2005年春、夏之交,在北京市及河北省香河县两地同时开展了臭氧和氮氧化合物的连续监测.结果表明,香河县和北京市的臭氧统计日变化形式基本一致,北京市大气臭氧平均浓度比香河低,分别为28×10-9V/V和43×10-9V/V;大气中Ox浓度北京市高于香河县,分别为72×10-9V/V和60×10-9V/V.观测期间,两地臭氧的月最高值出现时间一致,其中6月21日北京市的臭氧浓度最高达到200×10-9V/V,香河县也达到149×10-9V/V.在三次臭氧严重超标事件发生的前一天,两地都伴随有氮氧化合物的高浓度积累;南风时北京市和香河县的Ox浓度都比平均值高25%.Abstract: Ozone in the near-surface atmosphere as an important photochemical production has very close relation with NOx. Data on the concentrations of ozone and NOx was measured from spring to the summertime of 2005 in Beijing and Xianghe simultaneously. There are the same diurnal variations of ozone in Beijing and Xianghe. During the observation, ozone concentration is much lower in Beijing than that in Xianghe, which are 28�10-9 V/V and 43�10-9 V/V in Beijing and Xianghe respectively. But the Ox concentrations are reversed, which are 72�10-9 V/V and 60�10-9 V/V. The monthly highest ozone pollution episodes of Beijing and Xianghe happen at the same days. The maximum ozone with 200�10-9 V/V was observed on 21th June in Beijing, 149�10-9 V/V in Xianghe simultaneously. NOx is accumulated intensively before all the ozone pollution episodes. The Ox concentration is strongly correlated with wind. The concentrations of Ox are 25% higher than the average both in Beijing and Xianghe when the wind direction is south.
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Key words:
- ozone /
- NOx /
- Ox /
- wind direction
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