Evaluación de la Estabilidad Atmosférica Bajo Condiciones Físicas y Meteorólogicas del Altiplano Ecuatoriano

Velasteguí, Arquímides Xavier Haro; Nieto, Cecilia Teresa Limáico; Cahueñas, Nelly Patricia Perugachi; Parra, María Isabel Fernández

doi:10.1590/0102-7786332015

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…where ρ is the density of dry air (1.2 kgÁm −3 ), T (K) is the temperature, C p (1,010 JÁkg −1 ÁK −1 ) is the specific heat of air at constant pressure, k (0.4) is the Von Karman constant, and g (9.81 mÁs −2 ) is the gravitational acceleration (Bonan, 2015;Haro Velasteguí et al, 2018). The temperature and sensible heat flux (Q H ) were obtained from the meteorological station of II_UABC (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

“…In the Pasquill‐Gifford classification, net radiation and wind speed values are considered (Asharafi and Hoshyaripour, 2010). In the Monin‐Obukhov classification, the length L was estimated as follows:

L = - \frac{ρ C_{p} T u_{\cdot}^{3}}{italickg Q_{H}}

where ρ is the density of dry air (1.2 kg·m −3 ), T (K) is the temperature, C p (1,010 J·kg −1 ·K −1 ) is the specific heat of air at constant pressure, k (0.4) is the Von Karman constant, and g (9.81 m·s −2 ) is the gravitational acceleration (Bonan, 2015; Haro Velasteguí et al ., 2018). The temperature and sensible heat flux ( Q H ) were obtained from the meteorological station of II_UABC (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

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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

Flores-Jiménez

García-Cueto

Santillán-Soto

et al. 2021

Atmospheric Science Letters

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The objective was to analyze how representative tropospheric NO 2 column densities are of surface NO 2 measurements under different atmospheric stability conditions in the air basin of two border cities: Calexico, United States, and Mexicali, Mexico. NO 2 columns were measured by the Ozone Monitoring Instrument (OMI) on the NASA Aura satellite. NO 2 concentrations and meteorological parameters were also measured on the surface for comparison. Specifically, the correlations between OMI and surface NO 2 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 NO 2 and OMI NO 2 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 NO 2 measurements. The methodology applied and results obtained herein can enable us to better understand the representativeness of OMI NO 2 data in arid border zones with extreme meteorological conditions.

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Section: Methodsmentioning

confidence: 99%

L = - \frac{ρ C_{p} T u_{\cdot}^{3}}{italickg Q_{H}}

Section: Methodsmentioning

confidence: 99%

Influence of mixing height and atmospheric stability conditions on correlation of NO₂ columns and surface concentrations in a Mexico‐United States border region

Flores-Jiménez

García-Cueto

Santillán-Soto

et al. 2021

Atmospheric Science Letters

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“…In areas with valley topography, temperature inversions at night limit the dispersion of pollutants from sources of terrestrial origin (Allen et al 2011). At night, atmospheric stability varies from neutral to moderately stable, with an ambient temperature gradient smaller than the adiabatic dry temperature gradient (De Nevers 1998, Haro et al 2018. This situation generates that these VOCs.…”

Section: Introductionmentioning

confidence: 99%

VOCs and PM listing of Eucalyptus globulus combustion in residential wood stoves

Henriquez

Hernández

Varas-Concha

et al. 2023

Maderas, Cienc. tecnol.

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Pollutant residential emissions from wood stoves have significant impacts both on the environment and people's health. The above makes it essential to know the types of volatile organic compounds emitted during combustion and explore their relationship with particulate matter and greenhouse gas emissions. This paper studies and analyzes these emissions using Eucalyptus globulus as fuel varying its moisture levels. Emissions were determined using an adapted commercial stove. The concentration levels of volatile organic compounds and particulate matter increase with the moisture of wood. When analyzing volatile organic compounds, particulate matter, and O 2 with the combustion stages of wood, it is found that their concentrations were higher in the ignition and the reload stage. The concentrations of CO 2 and NO x were higher in the reload stage. Other chemical compounds, such as toluene, xylene, and benzene, were also found within the volatile organic compounds listing, which increased their concentration in the ignition and stable reload stages. However, in the quenching stage, they are not present. Finally, the dispersion of these molecules in the environment is evaluated, obtaining that if the atmospheric conditions are adverse, these molecules remain in the environment in direct contact with the people living in those places.

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Evaluación de la Estabilidad Atmosférica Bajo Condiciones Físicas y Meteorólogicas del Altiplano Ecuatoriano

Cited by 2 publications

References 9 publications

Influence of mixing height and atmospheric stability conditions on correlation of NO₂ columns and surface concentrations in a Mexico‐United States border region

Influence of mixing height and atmospheric stability conditions on correlation of NO₂ columns and surface concentrations in a Mexico‐United States border region

VOCs and PM listing of Eucalyptus globulus combustion in residential wood stoves

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Evaluación de la Estabilidad Atmosférica Bajo Condiciones Físicas y Meteorólogicas del Altiplano Ecuatoriano

Cited by 2 publications

References 9 publications

Influence of mixing height and atmospheric stability conditions on correlation of NO2 columns and surface concentrations in a Mexico‐United States border region

Influence of mixing height and atmospheric stability conditions on correlation of NO2 columns and surface concentrations in a Mexico‐United States border region

VOCs and PM listing of Eucalyptus globulus combustion in residential wood stoves

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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

Influence of mixing height and atmospheric stability conditions on correlation of NO₂ columns and surface concentrations in a Mexico‐United States border region