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Influence of mixing height and atmospheric stability conditions on correlation of NO2 columns and surface concentrations in a Mexico-United States border region
Atmospheric Science Letters ( IF 3 ) Pub Date : 2021-05-11 , DOI: 10.1002/asl.1024
David E. Flores‐Jiménez 1 , O. Rafael García‐Cueto 1 , Néstor Santillán‐Soto 1 , J. Ernesto López‐Velázquez 1 , Adriana Camargo‐Bravo 2
Affiliation  

The objective was to analyze how representative tropospheric NO2 column densities are of surface NO2 measurements under different atmospheric stability conditions in the air basin of two border cities: Calexico, United States, and Mexicali, Mexico. NO2 columns were measured by the Ozone Monitoring Instrument (OMI) on the NASA Aura satellite. NO2 concentrations and meteorological parameters were also measured on the surface for comparison. Specifically, the correlations between OMI and surface NO2 concentrations under different atmospheric stability conditions according to the Pasquill-Gifford (P-G) and Monin-Obukhov (M-O) classification schemes were determined for 2017 and 2018. During the passage of the satellite through the study area (11:00–13:00 UTC−8), unstable conditions were documented in both years. Good correlation was found between the surface NO2 and OMI NO2 column observations in the second semester of each year, particularly under unstable conditions as diagnosed by the P-G and M-O schemes applied in the first and second year, respectively. However, a weakening of these conditions occurs during the autumn–winter period. In both cases, the highest determination coefficients were found for Calexico, with values of 0.48 and 0.36 in 2017 and 2018, respectively; for Mexicali, the determination coefficients were 0.23 and 0.35, respectively. Under each atmospheric stability scheme, the mechanical and convective turbulence caused a decreasing trend in wind speed and solar radiation over the course of second semester of 2017 and in friction velocity, temperature, and sensible heat flux over the course of the same period for 2018. The negative trend of these parameters during the analyzed time frames helped to reduce the influence of unstable atmospheric conditions, favoring better correlations between satellite and surface NO2 measurements. The methodology applied and results obtained herein can enable us to better understand the representativeness of OMI NO2 data in arid border zones with extreme meteorological conditions.

中文翻译:

墨西哥-美国边境地区混合高度和大气稳定性条件对二氧化氮柱和地表浓度相关性的影响

其目的是分析对流层NO如何代表2列密度表面的NO 2两个边境城市的空气流域不同大气稳定度条件下进行测量:卡莱克西科,美国和墨西哥的墨西卡利。NO 2柱由 NASA Aura 卫星上的臭氧监测仪器 (OMI) 测量。为了比较,还在地表测量了NO 2浓度和气象参数。具体而言,OMI 与地表 NO 2之间的相关性根据 Pasquill-Gifford (PG) 和 Monin-Obukhov (MO) 分类方案确定了 2017 年和 2018 年不同大气稳定条件下的浓度。 −8),这两年都记录了不稳定的条件。在表面 NO 2和 OMI NO 2之间发现了良好的相关性每年第二学期的列观察,特别是在第一年和第二年应用的 PG 和 MO 方案诊断出的不稳定条件下。然而,在秋冬季期间,这些条件会减弱。在这两种情况下,Calexico 的决定系数最高,2017 年和 2018 年的值分别为 0.48 和 0.36;对于 Mexicali,决定系数分别为 0.23 和 0.35。在每个大气稳定方案下,机械和对流湍流导致 2017 年下半年风速和太阳辐射以及 2018 年同期摩擦速度、温度和感热通量的下降趋势。2 次测量。本文所应用的方法和获得的结果可以使我们更好地了解 OMI NO 2数据在极端气象条件下的干旱边界地区的代表性。
更新日期:2021-06-02
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