Rafael N. Liñán-Abanto

Jorge Basadre Grohmann National University

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D. Salcedo

Universidad Nacional Autónoma de México

T. Castro

Universidad Nacional Autónoma de México

L. G. Ruíz-Suárez

Universidad Nacional Autónoma de México

Giovanni Carabalí

Universidad Nacional Autónoma de México

HÁ

Harry Álvarez‐Ospina

Universidad Nacional Autónoma de México

P. Arnott

University of Nevada, Reno

G. Paredes-Miranda

University of Nevada, Reno

Oscar Peralta

Universidad Nacional Autónoma de México

W. P. Arnott

University of Nevada, Reno

Sara Erika Olivares-Salazar

Universidad Nacional Autónoma de México

Cooperative Institutions

Universidad Nacional Autónoma de México

University of Nevada, Reno

Desert Research Institute

Nevada System of Higher Education

Jorge Basadre Grohmann National University

Center for Research and Advanced Studies of the National Polytechnic Institute

Universidad Autónoma de la Ciudad de México

University of Ottawa

Rocky Mountain Research Station

University of Utah

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Optical properties of atmospheric particles over an urban site in Mexico City and a peri-urban site in Queretaro

Journal of Atmospheric Chemistry (2019)

Rafael N. Liñán-Abanto Oscar Peralta D. Salcedo L. G. Ruíz-Suárez P. Arnott

Dry season

Wet season

Single-scattering albedo

Albedo (alchemy)

10.1007/s10874-019-09394-1

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Citations (10)

Mediciones continuas de carbono negro, monóxido de carbono y dióxido de carbono, durante la temporada seca caliente 2016, en un sitio periurbano de Querétaro, México

CIENCIA & DESARROLLO (2020)

Rafael N. Liñán-Abanto D. Salcedo T. Castro Giovanni Carabeli Oscar Peralta

En Juriquilla-Querétaro, se midió la concentración en masa de carbono negro (BC), la relación de mezcla de monóxido de carbono (CO) y el dióxido de carbono (CO2). Las mediciones se realizaron del 01 de marzo al 30 de abril de 2016. En abril, los valores medios del BC (1.23 µg/m3) y CO (0.30 ppm) fueron mayores a sus correspondientes del mes de marzo (1.08 µg/m3 y 0.26 ppm, respetivamente). El CO2 no sufrió variación en estos meses y mantuvo un valor casi constante de alrededor de 406 ppm. Las tendencias diarias del BC, CO y CO2 fueron similares, con un máximo pronunciado por la mañana y un mínimo por la tarde. Estos contaminantes alcanzaron su valor máximo alrededor de las 08:00-09:00 Hora Local (HL). Se presentó una buena correlación en el ajuste lineal de BC-CO, BC-CO2 y CO-CO2, lo que sugiere que estos contaminantes provendrían de las mismas fuentes. Se observó un efecto fin de semana (valores más bajos del BC, CO y CO2 el fin de semana en comparación con los de días laborables), principalmente en las horas de máximo tráfico.Al no existir estudios de mediciones continuas de BC, CO y CO2; desarrollamos esta investigación para determinar las tendencias diarias de estos contaminantes y sus correlaciones mutuas en una zona periurbana, en Querétaro.

10.33326/26176033.2020.26.934

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nivel de confiabilidad de la modelación usada en la aplicación de Modelos de dispersión de Contaminantes Atmosféricos en los Estudios de Impacto Ambiental del Perú, 2005-2010

Informador Técnico (2013)

Rafael N. Liñán-Abanto

La presente investigación busca determinar el nivel de confiabilidad de la modelación en la aplicación de los Modelos de Dispersión de Contaminantes At- mosféricos (MDCA) en los Estudios de Impacto Ambiental (EIA) de los grandes proyectos de inversión sometidos al Sistema Nacional de Evaluación de Impacto Ambiental del Perú (SEIA), entre los años 2005 y 2010. Para la revisión sistemá- tica de las aplicaciones de los MDCA en una muestra representativa de doce (12) proyectos, a partir de una población de 785 EIA, que incluye proyectos mineros, fundiciones y centrales termoeléctricas, usamos un instrumento validado por expertos. Los resultados demuestran que las aplicaciones de los MDCA no se realizaron con una aproximación metodológica adecuada, por consiguiente, su nivel de confiabilidad es bajo debido a que no se estudiaron mi definieron los problemas adecuadamente, no se construyó ni se seleccionó el modelo apropiado, no se especificaron los valores de las variables y los parámetros a evaluar y validar.

10.23850/22565035.52

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Pm Chemical Characterization at a Semi-Arid Urban Environment in Central Mexico

D. Salcedo Harry Álvarez‐Ospina Rafael N. Liñán-Abanto T. Castro

The central part of Mexico, a semi-arid region, hosts many anthropogenic activities that might affect the air quality of the several large cities within; however, the processes that occur in its atmosphere are poorly understood. Here, we investigated the concentration and chemical composition of the particulate matter in the Metropolitan Area of Queretaro for one year, together with meteorological variables and other pollutants data. Seasonal concentrations were determined by temperature, humidity, regional transport, and boundary layer height. Additional to the typical primary combustion sources in an urban area, resuspension was very important, as expected in a semi-arid climate; however, the secondary components comprised the largest fraction of PM2.5. Regional processing of aerosol played a very important role in the formation of secondary aerosols. Local oxidation producing nitrate and less oxidized organic aerosol, occurred more rapidly at night, although photochemical production in the morning was also observed. These results represent the first study of its kind in the MAQ and its surrounding area; hence, they are highly relevant regarding local and regional air pollution. In addition, they might be important for better understanding the production of secondary aerosols in other semi-arid urban areas.

Characterization

10.2139/ssrn.4485258

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Black Carbon in a City of the Atacama Desert before and after the Start of the COVID-19 Lockdown: Ground Measurements and MERRA-2 Reanalysis

Remote Sensing (2023)

Rafael N. Liñán-Abanto W. P. Arnott G. Paredes-Miranda Omar Ramos-Pérez D. Salcedo

In this study, the temporal variations of black carbon (BC) were analyzed from November 2019 to September 2021, in Tacna, Peru. Ground measurements obtained with a photoacoustic extinctiometer (PAX BC) and NASA’s MERRA-2 reanalysis data (MERRA-2 BC) were used. The seasonal concentrations of PAX BC (mean ± standard deviation) were as follows: 0.70 ± 0.35, 0.73 ± 0.46, 0.70 ± 0.39, and 0.85 ± 0.46 µg m−3, for spring, summer, autumn, and winter, respectively; while MERRA-2 BC values were 0.12 ± 0.11, 0.06 ± 0.02, 0.06 ± 0.02, and 0.11 ± 0.06 µg m−3, for the same seasons. We found a large discrepancy between these two techniques, as the PAX BC measurements were an order of magnitude higher than the MERRA-2 BC values. In addition, MERRA-2 did not record urban pollution events and did not present the BC weekend effect. The most frequent wind direction (81%) was from the southwest and the sources of greatest contamination were located to the northeast and southeast. The Mann–Kendall test confirmed a downward trend in PAX BC one week (37%) and two weeks (30%) after the start of the COVID-19 lockdown, and no trend in MERRA-2 BC. These results suggest that MERRA-2 underestimates the BC emissions from local sources.

10.3390/rs15194702

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Citations (2)

Respiratory Aerosols: the dominant route of the spread of COVID 19

Atmósfera (2020)

Rafael N. Liñán-Abanto

2019-20 coronavirus outbreak

10.20937/atm.52967

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PM chemical characterization at a semi-arid urban environment in Central Mexico

Urban Climate (2023)

D. Salcedo Harry Álvarez‐Ospina Sara Erika Olivares-Salazar Rafael N. Liñán-Abanto T. Castro

10.1016/j.uclim.2023.101723

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Characteristics of Absorbing Aerosols in Mexico City: A Study of Morphology and Columnar Microphysical Properties

Atmosphere (2024)

Giovanni Carabalí Faustino Juárez-Sánchez Rafael N. Liñán-Abanto Héctor Estévez Mauro Valdés-Barrón

This paper presents an analysis of the morphology and columnar microphysical properties of atmospheric aerosols in Mexico City (MC) for the period 2022–2023. The morphological study focused on the structure description of soot particles and tar balls (TB). By transmission electron microscope (TEM) and scanning electrode microscope (SEM), voluminous soot aggregates mixed with TBs were observed. The chemistry shows that both soot and TBs are mostly carbonaceous species with well-defined morphologies. On the other hand, the columnar aerosol microphysical properties recovered from AERONET show that the particles have a bimodal aerosol size distribution (ASD) with two modes: fine and coarse. The ASD remains constant without showing significant seasonal changes, only with some variability for coarse particles. The aerosol optical depth (AOD) value is significantly high, typical of urban areas. The real (n) and imaginary (k) parts of the complex refractive index (CRI) were obtained from the photometric measurements. The CRI values show seasonal variations, with spring being the season with the highest values for n, while the highest values for k were measured in winter.

Morphology

AERONET

10.3390/atmos15010108

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Citations (2)

Temporal variations of black carbon, carbon monoxide, and carbon dioxide in Mexico City: Mutual correlations and evaluation of emissions inventories

Urban Climate (2021)

Rafael N. Liñán-Abanto D. Salcedo P. Arnott G. Paredes-Miranda Michel Grutter

Emission inventory

Carbon fibers

10.1016/j.uclim.2021.100855

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Citations (19)