Sensitivity of ozone to summertime climate in the eastern USA: A modeling case study
Sensitivity of ozone to summertime climate in the eastern USA: A modeling case study
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DOI：
10.1016/j.atmosenv.2006.10.033
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发表时间：
2007-03-01
影响因子：
5
通讯作者：
Pandis, Spyros N.
中科院分区：
文献类型：
--
作者：
Dawson, John P.;Adams, Peter J.;Pandis, Spyros N.
这项模拟研究的目标是确定臭氧浓度如何响应美国东部地区的气候变化。分别研究了臭氧平均浓度对温度、风速、绝对湿度、混合高度、云中液态水含量和光学厚度、云区面积、降雨率和降水区范围的敏感性。模拟时间为2001年7月12-21日，在此期间东南部发生了臭氧事件。使用的臭氧指标包括每日最高8小时平均O-3浓度和超过美国环保局环境空气质量标准的网格单元数量。对这两个臭氧指标影响最大的气象因子是温度，在模拟区域内，温度使日最大8h平均O-3增加了0.34 ppb K-1。绝对湿度对日最大8h平均O-3的影响较小(绝对湿度每增加一个百分点，O-3的日最大值为-0.025 ppb)。虽然区域平均对风速、混合高度、云中液态水含量和光学厚度变化的响应相当小，但这些因素在许多地区确实具有明显的局部影响。温度对空气质量超标的影响也最大；温度每升高2.5K，超标面积就会增加30%。风速和混合高度对臭氧空气质量超标也有显著影响。(C)2006爱思唯尔有限公司。保留所有权利。
The goal of this modeling study is to determine how concentrations of ozone respond to changes in climate over the eastern USA. The sensitivities of average ozone concentrations to temperature, wind speed, absolute humidity, mixing height, cloud liquid water content and optical depth, cloudy area, precipitation rate, and precipitating area extent are investigated individually. The simulation period consists of July 12-21, 2001, during which an ozone episode occurred over the Southeast. The ozone metrics used include daily maximum 8 h average O-3 concentration and number of grid cells exceeding the US EPA ambient air-quality standard. The meteorological factor that had the largest impact on both ozone metrics was temperature, which increased daily maximum 8 h average O-3 by 0.34 ppb K-1 on average over the simulation domain. Absolute humidity had a smaller but appreciable effect on daily maximum 8 h average O-3 (-0.025 ppb for each percent increase in absolute humidity). While domain-average responses to changes in wind speed, mixing height, cloud liquid water content, and optical depth were rather small, these factors did have appreciable local effects in many areas. Temperature also had the largest effect on air-quality standard exceedances; a 2.5 K temperature increase led to a 30% increase in the area exceeding the EPA standard. Wind speed and mixing height also had appreciable effects on ozone air-quality standard exceedances. (c) 2006 Elsevier Ltd. All rights reserved.