Climatology of ozone exceedences in the Atlanta metropolitan area: 1-hour vs 8-hour standard and the role of plume recirculation air pollution episodes
Climatology of ozone exceedences in the Atlanta metropolitan area: 1-hour vs 8-hour standard and the role of plume recirculation air pollution episodes
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DOI：
10.1021/es961068a
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发表时间：
1997-01-01
影响因子：
11.4
通讯作者：
Chameides, William L.
中科院分区：
文献类型：
--
作者：
St John, James C.;Chameides, William L.
这项工作比较了相对频率和气象条件最有利于目前的1小时/120 ppbv国家环境空气质量标准的臭氧和建议的修订标准的基础上，每日最大8小时平均值的beneficiations。从1987年到1993年在佐治亚州亚特兰大收集的化学和气象数据，用于确定每天最大的1小时和8小时平均臭氧混合比在每个当地监测站点，在每年的臭氧季节。最高的最大值和并发的当地气象条件的性质进行了检查。我们发现，在亚特兰大的每日最大1小时和8小时平均值（R-2 = 0.92）之间的相关性很高，8小时的每日最大浓度为98 ppbv的气候相当于1小时的每日最大值为120 ppbv。在7年的调查期间，8小时平均浓度为70，80和90 ppbv的连续性在亚特兰大比目前的1小时/120 ppbv标准的连续性高出约5，3和2倍。在此期间，促成亚特兰大最严重的1小时和8小时最大臭氧污染事件的气象条件非常相似。大多数最极端的1小时和8小时的事件与多天的情节非常停滞的气象条件和亚特兰大的羽流连续几天的再循环和再煮。这些事件，被称为“羽流再循环”的情节，是从其他多天的情节，其特点是相当稳定的风，很少或没有再循环，和更温和的O-3浓度不同。烟羽再循环事件是亚特兰大最严重的O-3污染事件之一，因此被格鲁吉亚州选择在其最新的州实施计划（SIP）中用于城市空气区建模，即使现在颁布了8小时标准，也可能仍然是未来SIP的重点。
This work compares the relative frequencies of and meteorological conditions most conducive to exceedences of the current 1-h/120-ppbv national ambient air quality standard for ozone and the proposed revised standard based on daily maximum 8-h averages. Chemical and meteorological data gathered from 1987 through 1993 in Atlanta, GA, are used to determine the daily maximum 1-h and 8-h average ozone mixing ratios at each local monitoring site, during the ozone season for each year. The nature of the highest among the maxima and the concurrent local meterological conditions are examined. We find a high degree of correlation between the daily maximum 1-h and 8-h averages (R-2 = 0.92) in Atlanta, with an 8-h daily maximum concentration of 98 ppbv being climatologically equivalent to a 1-h daily maxima of 120 ppbv. Over the 7-year period investigated, exceedences of 8-h-averaged concentrations of 70, 80, and 90 ppbv were about 5, 3, and 2 times more frequent in Atlanta than exceedences of the current 1-h/120-ppbv standard. Meteorological conditions that fostered Atlanta's most severe 1-h and 8-h maximum ozone pollution events over the period were quite similar. The majority of the most extreme 1-h and 8-h events were associated with multiple-day episodes with very stagnant meteorological conditions and a recirculation and recooking of Atlanta's plume on consecutive days. These events, called 'plume recirculation' episodes, are distinct from other multiple-day episodes that were characterized by fairly steady winds, little or no recirculation, and more modest O-3 concentrations. Plume recirculation episodes are among Atlanta's most severe O-3 exceedences and therefore were chosen by the State of Georgia for urban airshed modeling in its most recent State Implementation Plan (SIP) and will likely remain the focus in future SIPs even if a now 8-h standard is promulgated.