Time variability of the total methane content in the atmosphere over the vicinity of St. Petersburg

Makarova, Maria; Поберовский, А. В.; Visheratin, K. N.; Polyakov, A. V.

doi:10.1134/s000143380906005x

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…Measurements of CO 2 TC showed changes of the amplitude of seasonal variations correlated with temperature anomalies in the summer period. Studies of seasonal variations of CH 4 and CO TCs revealed their significant variability [3,4]. Seasonal behavior of such components as HF, HCl, HNO 3 are in good agreement with data of NDACC stations and measurements of satellite devices.…”

Section: Results Of Measurements and Comparisons With Satellite Datasupporting

confidence: 60%

Ground-based measurements of atmospheric trace gases near Saint-Petersburg, Russia

Timofeyev¹,

Poberovsky²,

Makarova³

et al. 2013

AIP Conference Proceedings

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Section: Results Of Measurements and Comparisons With Satellite Datasupporting

confidence: 60%

Ground-based measurements of atmospheric trace gases near Saint-Petersburg, Russia

Timofeyev¹,

Poberovsky²,

Makarova³

et al. 2013

AIP Conference Proceedings

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“…In Saint Petersburg State University (SPbU), spectroscopic measurements of total column methane were started in 1991 (Mironenkov et al, 1996;Makarova et al, 2009). These measurements up to the year 2009 were carried out using a solar IR grating spectrometer with resolution of 0.4-0.6 cm −1 .…”

Section: Introductionmentioning

confidence: 99%

Comparisons of CH<sub>4</sub> ground-based FTIR measurements near Saint Petersburg with GOSAT observations

et al. 2014

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“…The distribution of all the total vertical columns of methane measured between June 2010 and December 2011 are presented in Figure 3 (Makarova et al, 2009;Angelbratt et al, 2011). Despite the strong global trend, a comparison is presented in Table III with other stations around the world.…”

Section: Resultsmentioning

confidence: 99%

Solar absorption infrared spectroscopic measurements over Mexico City: Methane enhancements

Bezanilla¹,

Krüger²,

Stremme³

et al. 2014

Atmósfera

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RESUMENEn este trabajo se describe el experimento para realizar mediciones espectroscópicas de absorción solar en el infrarrojo desde el observatorio atmosférico de la Universidad Nacional Autónoma de México (UNAM), ubicado en el campus de Ciudad Universitaria en la ciudad de México. El espectrofotómetro por transformada de Fourier en el infrarrojo (FTIR, por sus siglas en inglés) opera con el rastreador solar desde junio de 2010, y a partir de los espectros medidos se calculan las densidades totales de columna de varios gases atmosféricos. Se presentan los resultados para el metano (CH 4 ), un contaminante que participa en la formación de ozono y que es importante como gas de efecto invernadero. Las columnas totales obtenidas con alta resolución temporal muestran gran dispersión y variabilidad diaria. Para los análisis que comprenden el periodo junio de 2010 a diciembre de 2011 se obtuvo un valor promedio de 2.88 × 10 19 moléculas/cm 2 (1.829 ppm) con un intervalo de confianza del 95% entre las 2.62 y 3.14 × 10 19 moléculas/cm 2 . No se puede identificar un ciclo anual claro de los promedios mensuales, lo cual sugiere una afectación significativa de la concentración natural de fondo como resultado de las emisiones locales. Se presentan algunos días con aumentos extraordinarios, y un análisis sencillo de las trayectorias apunta a una dirección predominante desde el noreste del sitio de mediciones. Sin embargo, es probable que las masas contaminadas con metano que pasan sobre el observatorio atmosférico de la UNAM se originen no en una sino en varias fuentes distribuidas por la ciudad de México. Se requiere análisis más detallado de la dinámica de estas masas de aire mediante modelación. ABSTRACTIn this work, the experiment for performing solar-absorption infrared measurements from the atmospheric observatory of the Universidad Nacional Autónoma de México (UNAM) located at the university campus in Mexico City is described. The Fourier transform infrared (FTIR) spectrometer and solar-tracking system have been operating since June 2010, and from the recorded spectra the total column amounts of several atmospheric gases can be derived. The current study presents the results obtained for methane (CH 4 ), an important pollutant involved in ozone production and a rapidly increasing greenhouse gas. The total column amounts, retrieved with high temporal resolution, present a large dispersion and day-to-day variability. A mean value of 2.88 × 10 19 molecules/cm 2 (1.829 ppm), with a 95% confidence interval between 2.62 and 3.14 × 10 19 molecules/cm 2 , has been obtained for the period from June 2010 to December 2011. No clear annual cycle can be determined from the monthly means due to the large variability in the measurements, suggesting a significant effect of local emissions on the natural background concentrations. Some days with extraordinary enhancements are presented and a simple back trajectory analysis points to a predominant source direction from the northeast of the measurement site. The methane-contaminated ai...

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Time variability of the total methane content in the atmosphere over the vicinity of St. Petersburg

Cited by 13 publications

References 6 publications

Ground-based measurements of atmospheric trace gases near Saint-Petersburg, Russia

Ground-based measurements of atmospheric trace gases near Saint-Petersburg, Russia

Comparisons of CH<sub>4</sub> ground-based FTIR measurements near Saint Petersburg with GOSAT observations

Solar absorption infrared spectroscopic measurements over Mexico City: Methane enhancements

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Time variability of the total methane content in the atmosphere over the vicinity of St. Petersburg

Cited by 13 publications

References 6 publications

Ground-based measurements of atmospheric trace gases near Saint-Petersburg, Russia

Ground-based measurements of atmospheric trace gases near Saint-Petersburg, Russia

Comparisons of CH&lt;sub&gt;4&lt;/sub&gt; ground-based FTIR measurements near Saint Petersburg with GOSAT observations

Solar absorption infrared spectroscopic measurements over Mexico City: Methane enhancements

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Comparisons of CH<sub>4</sub> ground-based FTIR measurements near Saint Petersburg with GOSAT observations