Comparison of ozone exposure characteristics in forested regions near Mexico City and Los Angeles

Miller, Paul R.; Bauer, María de Lourdes de Lourdes de la Isla de de; Nolasco, Abel Quevedo; Tejeda, Tomás Hernández

doi:10.1016/1352-2310(94)90029-9

Cited by 43 publications

(22 citation statements)

References 10 publications

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“…8 (44) 2006; Ferreti et al, 2007aFerreti et al, , 2007b y la disminución del crecimiento radial (Peterson et al, 1991;Somers et al, 1998). Otras invvestigaciones señalan efectos sobre el desarrollo del follaje de árboles de bosques templados; por ejemplo, clorosis foliar, caída prematura de acículas, seguido de un proceso de senescencia prematura, el cual culmina con la muerte parcial o total de los individuos en extensas áreas forestales (Miller et al, 1994;Grulke y Lee 1997;Skelly et al, 1997;Somers et al, 1998;Krupa, 1999;Hernández-Tejeda, 2014).…”

Section: Revista Mexicana De Ciencias Forestalesunclassified

“…Sin embargo, Miller et al (1994), con medios electrónicos automatizados registraron concentraciones de ozono del orden de 16 a 88 ppb promedio por hora, de mayo de 1990 a abril de 1991 en el DDL.…”

Section: De = Error Estándarunclassified

“…En todos los sitios de monitoreo se obtuvieron concentraciones de ozono promedio que esta variable es determinante para una mayor producción de ozono troposférico, pues de acuerdo con Miller et al, (1994) y Jáuregui (1993b a una altitud superior existe más cantidad de luz ultravioleta en la atmósfera, a Revista Mexicana de Ciencias Forestales Vol. 8 (44) disposición para que las moléculas por absorción aumenten su reactividad fotoquímica (flujo actínico).…”

Section: Influencia De La Altitud Y Distancia De La Fuente De Emisiónunclassified

“…También, se ha evidenciado que el ozono puede ser transportado a cientos de millas de las áreas donde se ubican los precursores originales (Miller et al, 1994;US EPA, 1984). Letras distintas indican diferencias significativas con p<0.0001.…”

Section: Influencia De La Altitud Y Distancia De La Fuente De Emisiónunclassified

“…Letras distintas indican diferencias significativas con p<0.0001. Con base en los resultados obtenidos, es evidente que la altitud y el patrón de vientos dominantes que circulan de nor-noreste a sur-suroeste en la Cuenca de México (Jáuregui et al, 1981;Jáuregui, 1993a;Miller et al, 1994;Bravo y Díaz, 1996;Raga et al, 1999;Bravo et al, 2001;Jáuregui, 2002) desempeñan un papel crucial en la concentración e incremento de los niveles de ozono en el área bajo estudio (Jáuregui et al, 1981;Jáuregui, 1993a;Miller et al, 1994;Bravo y Díaz, 1996;Raga et al, 1999;Bravo et al, 2001;Jáuregui, 2002).…”

Section: Influencia De La Altitud Y Distancia De La Fuente De Emisiónunclassified

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Concentraciones in situ de ozono en bosques de la Cuenca de México e influencia de la altitud

Alvarado-Rosales

Saavedra-Romero

Hernández-Tejeda

et al. 2017

RMCF

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Resumen:La presencia de contaminantes fotoquímicos en la Cuenca de México es una realidad, y el daño que causan a la salud humana y a la vegetación es evidente. La falta de datos sobre concentraciones de ozono en los bosques de la Cuenca fue la principal razón para realizar el presente estudio en tres áreas boscosas: El Ajusco (AJU), Desierto de los Leones (DDL) e Izta-Popocatépetl (IZP). Se utilizaron monitores pasivos CanOxy Plate TM con períodos de exposición de tres semanas,

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Section: Revista Mexicana De Ciencias Forestalesunclassified

Section: De = Error Estándarunclassified

Section: Influencia De La Altitud Y Distancia De La Fuente De Emisiónunclassified

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Concentraciones in situ de ozono en bosques de la Cuenca de México e influencia de la altitud

Alvarado-Rosales

Saavedra-Romero

Hernández-Tejeda

et al. 2017

RMCF

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Global radiation attenuation by air pollution and its effects on the thermal climate in Mexico City

Jáuregui

Luyando

1999

Int. J. Climatol.

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Solar radiation attenuation in Mexico City is estimated by comparing global radiation intensity observed at a station in the downtown area, relative to that observed in a cleaner rural air at a site 8 km northeast of the airport. On average, the city receives on clear days during the dry season 21.6% less solar energy than the rural surroundings. Similar values of attenuation are observed during the rainy season when aerosol concentration is abated by a wash-out effect. As expected, solar dimming shows an inverse relation to wind and temperature. Attenuation reaches its maximum (25-35%) with prevailing weak winds (1 -2 m/s) and high noon relative humidity. In the city, variation of global radiation by the day of week, shows that solar attenuation is highest on Tuesdays, while on Saturdays solar dimming by smog was less. Since a similar weekly variation (with lower values) was observed at the rural site, the conclusion was that the smog layer affects the solar radiation climate in rural areas beyond the immediate city limits. The declining annual mean of maximum temperatures observed near the limits of the Mexico City basin, suggests that the smog layer is affecting the radiation and thermal climate of a vast region downwind of the capital city.An attempt is made to show that while in the industrial and downtown areas the day time heat island effect dominates over the cooling effect of aerosols, in other suburban and rural sites downwind and away from the warm air mass, the reflecting properties of the smog layer seem to prevail resulting in an observed decreasing trend in maximum temperatures. From the above it may be concluded that maximum temperatures continue to rise in downtown Mexico City in spite of the attenuation due to absorption and reflection of incoming solar energy by the smog layer.

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Histologic, metabolomic, and transcriptomic differences in fir trees from a peri‐urban forest under chronic ozone exposure

Reyes‐Galindo,

Jaramillo‐Correa,

Shishkova

et al. 2024

Ecology and Evolution

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Urbanization modifies ecosystem conditions and evolutionary processes. This includes air pollution, mostly as tropospheric ozone (O3), which contributes to the decline of urban and peri‐urban forests. A notable case are fir (Abies religiosa) forests in the peripheral mountains southwest of Mexico City, which have been severely affected by O3 pollution since the 1970s. Interestingly, some young individuals exhibiting minimal O3—related damage have been observed within a zone of significant O3 exposure. Using this setting as a natural experiment, we compared asymptomatic and symptomatic individuals of similar age (≤15 years old; n = 10) using histologic, metabolomic, and transcriptomic approaches. Plants were sampled during days of high (170 ppb) and moderate (87 ppb) O3 concentration. Given that there have been reforestation efforts in the region, with plants from different source populations, we first confirmed that all analyzed individuals clustered within the local genetic group when compared to a species‐wide panel (Admixture analysis with ~1.5K SNPs). We observed thicker epidermis and more collapsed cells in the palisade parenchyma of needles from symptomatic individuals than from their asymptomatic counterparts, with differences increasing with needle age. Furthermore, symptomatic individuals exhibited lower concentrations of various terpenes (ß‐pinene, ß‐caryophylene oxide, α‐caryophylene, and ß‐α‐cubebene) than asymptomatic trees, as evidenced through GC–MS. Finally, transcriptomic analyses revealed differential expression for 13 genes related to carbohydrate metabolism, plant defense, and gene regulation. Our results indicate a rapid and contrasting phenotypic response among trees, likely influenced by standing genetic variation and/or plastic mechanisms. They open the door to future evolutionary studies for understanding how O3 tolerance develops in urban environments, and how this knowledge could contribute to forest restoration.

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Comparison of ozone exposure characteristics in forested regions near Mexico City and Los Angeles

Cited by 43 publications

References 10 publications

Concentraciones in situ de ozono en bosques de la Cuenca de México e influencia de la altitud

Concentraciones in situ de ozono en bosques de la Cuenca de México e influencia de la altitud

Global radiation attenuation by air pollution and its effects on the thermal climate in Mexico City

Histologic, metabolomic, and transcriptomic differences in fir trees from a peri‐urban forest under chronic ozone exposure

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