Relationships of coastal nocturnal boundary layer winds and turbulence to Houston ozone concentrations during TexAQS 2006
Relationships of coastal nocturnal boundary layer winds and turbulence to Houston ozone concentrations during TexAQS 2006
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2006 年 TexAQS 期间沿海夜间边界层风和湍流与休斯顿臭氧浓度的关系
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Hardesty
中科院分区：
文献类型：
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作者：
S. Tucker;R. Banta;A. Langford;C. Senff;W. Brewer;E. Williams;B. Lerner;H. Osthoff;R. Hardesty
[1]在2006年夏季德克萨斯州空气质量研究期间使用船载多普勒测风激光雷达进行测量，研究了德克萨斯州休斯顿两种不同流型下对流层下部垂直结构与风和臭氧（O3）浓度之间的关系。我们观察到，由美国大西洋沿岸的副热带反气旋（百慕大高压）主导的强南风流型导致了强（即，高风速）陆上夜间低空急流（LLJ）和低O3和氧化剂Ox（其中Ox = O3 + NO2）浓度在晚上和第二天下午。相比之下，偏北或偏东气流占主导地位的时期导致相对较弱（低风速），但仍然在岸上，夜间LLJ与较高的并发和第二天的O3和Ox浓度。我们目前的激光雷达数据从24小时的例子周期为每一个这些条件，并演示了如何每种类型的流态相关的原位船基臭氧测量。我们扩大了研究范围，包括研究期间船在休斯顿附近的所有日子，以证明高空的纬向风的强度如何显示出比表面附近的风更好的与同时船测得的Ox浓度的关系。我们发现了一个很强的关系之间的参数化观测到的夜间喷气机，这反映了天气条件，峰值每小时O3测量的第二天在船上和平均整个休斯顿/加尔维斯顿/Brazoria连续环境监测站监测网络，规划空气质量的潜在应用。
[1] Measurements made with a ship-based Doppler wind lidar during the summertime 2006 Texas Air Quality Study are used to study the relationship between lower-tropospheric vertical structure and winds and ozone (O3) concentrations in Houston, Texas, under two different flow regimes. We observed that strong southerly flow regimes, dominated by the subtropical anticyclone (Bermuda high) off the Atlantic coast of the United States, resulted in strong (i.e., high wind speed) onshore nocturnal low-level jets (LLJ) and low O3 and oxidant Ox (where Ox = O3 + NO2) concentrations at night and the following afternoon. In contrast, periods dominated by northerly or easterly flow resulted in relatively weak (low wind speed), but still onshore, nocturnal LLJs associated with higher concurrent and next-day concentrations of O3 and Ox. We present lidar data from 24 h example periods for each of these conditions and demonstrate how each type of flow regime is related to in situ ship-based ozone measurements. We expanded the study to include all days during the study when the ship was near Houston, to demonstrate how the strength of the meridional winds aloft show a better relationship to concurrent ship-measured Ox concentrations than the winds near the surface do. We found a strong relationship between a parameterization of the observed nocturnal jets, which reflect the synoptic conditions, to peak hourly O3 measured the next day at the ship and averaged throughout the Houston/Galveston/Brazoria continuous ambient monitoring stations monitoring network, indicating potential applications for planning air quality.