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Aspects of ozone transport, mixing, and chemistry in the greater Maryland area

机译：大马里兰地区的臭氧传输，混合和化学方面

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摘要

This study examined the role of ozone transported and the subsequent mixing of the transported ozone on the ozone concentration and chemistry in the surface layer at locations in central Maryland. Surface data from the United States Environmental Protection Agency's (EPA) Aerometric Information Retrieval System (AIRS) database, ozone profile data from the University of Maryland's aircraft measurements, trajectory analyses using the HYSPLIT model, and predictions using the Semi-Empirical Integrated Pollution Model (SIPM) for the periods 11-15 July 1995 and 12-16 July 1997 were used to meet the objectives of this study. It was found that on the day before the air mass reached the receptor in Maryland, the air mass passed over regions where the diurnal maximum ozone concentration was sufficiently large and the mixing sufficiently deep, in most cases, to have been the primary source of the ozone that was found over central Maryland the next morning. Mixing took place between the air mass above the nocturnal inversion and the surface layer when the nocturnal inversion broke down sometime after sunrise, and the ozone in the surface layer increased by about 13ppb, on average, as a result of the mixing. The results also showed that when certain conditions were met, the chemistry in the surface layer produced up to about three times more ozone when mixing of ozone into the surface layer took place and when a non-zero value for the diurnal minimum zone concentrations were used to initialize the chemistry. There were, however, a number of situations when mixing of ozone into the surface layer and when a non-zero value for the diurnal minimum ozone concentrations were used to initialize the chemistry, had little effect on the surface ozone layer. The conditions, under which both situations occurred, are discussed.
机译：这项研究检查了运输的臭氧的作用以及随后运输的臭氧对马里兰州中部地区表层臭氧浓度和化学成分的混合作用。来自美国环境保护局（EPA）的航空信息检索系统（AIRS）数据库的表面数据，来自马里兰大学的飞机测量结果的臭氧剖面数据，使用HYSPLIT模型进行的轨迹分析以及使用半经验综合污染模型进行的预测（ 1995年7月11日至15日和1997年7月12日至16日期间的SIPM）用于实现本研究的目标。据发现，在空气质量到达马里兰州的接收器的前一天，空气质量越过了区域，在这些区域中，每日最大臭氧浓度足够大，并且混合足够深，在大多数情况下，它们已成为空气的主要来源。第二天早上在马里兰州中部发现的臭氧。当日出后的某个时间夜间反转发生破坏时，夜间反转上方的空气质量与表层之间发生混合，并且由于混合，平均地表层中的臭氧增加了约13ppb。结果还表明，当满足某些条件时，当将臭氧混合到表层中并且使用昼夜最小区域浓度的非零值时，表层中的化学物质最多产生约三倍的臭氧。初始化化学反应。但是，在许多情况下，将臭氧混合到表层中，并且使用非零的每日最低臭氧浓度值来初始化化学过程，对表层臭氧层的影响很小。讨论了两种情况都发生的条件。

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