CHARACTERIZATION OF OZONE AT HIGH ELEVATION IN THE EASTERN UNITED-STATES - TRENDS, SEASONAL-VARIATIONS, AND EXPOSURE
CHARACTERIZATION OF OZONE AT HIGH ELEVATION IN THE EASTERN UNITED-STATES - TRENDS, SEASONAL-VARIATIONS, AND EXPOSURE
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DOI：
10.1029/92jd00503
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发表时间：
1992-06-20
影响因子：
4.4
通讯作者：
LI, Z
中科院分区：
文献类型：
--
作者：
ANEJA, VP;LI, Z
对 1986 年 5 月至 10 月至 1988 年期间美国东部 5 个高海拔（大于或接近 1000 m msl）山云化学计划 (MCCP) 站点的臭氧测量结果进行了分析。为了描述和比较这些地点的臭氧暴露情况，使用了几种臭氧暴露指数。 1988 年所有每小时平均臭氧浓度等于或大于 0.07 ppm (SUM07) 的总和表明了臭氧暴露的南北梯度：东南部地点（北卡罗来纳州米切尔山，百万分之 105 小时 (ppm-h)，弗吉尼亚州白托普山，85.7 ppm-h，弗吉尼亚州谢南多厄公园，51.6 ppm-h）；东北地区（纽约州怀特菲斯山，49.2 ppm-h，新罕布什尔州穆西劳克山，34.2 ppm-h）。这表明，在1988年炎热干燥的测量季节，东南部高海拔地区的森林地区比东北地区的森林地区经历了更高的臭氧暴露。所有地点的臭氧事件（浓度大于 70 ppbv 持续 8 小时或更长时间）在夏季更为频繁。这表明与季节性光化学循环以及可能与当地生物碳氢化合物排放相关。季节性分析表明，臭氧峰值出现在春季，与夏威夷莫纳罗亚山和欧洲阿尔卑斯山站的春季峰值一致，暗示了潜在的半球现象。从 5 月到 10 月，所有五个高海拔地点都观察到了反向昼夜循环（夜间最大值）模式。在高臭氧事件期间，回溯轨迹分析表明，大多数 MCCP 地点受到美国中西部地区城市和工业来源的影响，表明大规模的运输模式。
Ozone measurements at five high-elevation (greater-than-or-similar-to 1000 m msl) Mountain Cloud Chemistry Program (MCCP) sites in the eastern United States for the period from May to October 1986-1988 have been analyzed. In order to characterize and compare the exposure to ozone at these sites, several ozone exposure indices are used. The sum of all hourly mean ozone concentrations equal to or greater than 0.07 ppm (SUM07) for 1988 indicates a north-south gradient in ozone exposure: Southeastern sites (Mount Mitchell, North Carolina, 105 parts per million-hours (ppm-h), Whitetop Mountain, Virginia, 85.7 ppm-h, Shenandoah Park, Virginia, 51.6 ppm-h); Northeastern sites (Whiteface Mountain, New York, 49.2 ppm-h, Mount Moosilauke, New Hampshire, 34.2 ppm-h). This shows that forest areas in the southeastern high-elevation sites experienced higher ozone exposure than their northeastern counterparts during the hot and dry 1988 measurement season. Ozone episodes (concentrations greater than 70 ppbv lasting 8 hours or more) were more frequent during the summer months at all sites. This suggests a correlation with the seasonal photochemical cycle and perhaps with local biogenic hydrocarbon emissions. Seasonal analysis suggests that ozone maximum occurs during spring coincident with spring maximum at Mauna Loa, Hawaii and at Alpine stations in Europe, suggestive of an underlying hemispheric phenomena. A reversed diumal cycle (nighttime maximum) pattern was also observed from May to October at all the five high-elevation sites. Back trajectory analysis, during high-ozone episodes, indicates that most MCCP sites were influenced by urban and industrial sources from the midwestern region of the United States, suggesting large-scale transport patterns.