Quantification of total emission of air pollutants from Beijing using mobile mini-DOAS

Johansson, Mikael; Galle, Bo; Yu, Tao; Tang, Lin; Chen, Deliang; Li, Haijun; Li, Jin Xiang; Zhang, Yan

doi:10.1016/j.atmosenv.2008.05.025

Cited by 64 publications

(61 citation statements)

References 12 publications

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“…The MAX-DOAS instrument was mounted on a car roof, and continuous measurements were performed on closed driving routes around the city center on three days during April 2010 and one day in January 2011. In combination with wind data, the total emissions from the encircled area can be determined (Johansson et al, 2008Rivera et al, 2009;Wagner et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Estimation of NOx emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data

et al. 2011

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Abstract. We present the first Multi-Axis-(MAX-) DOAS observations in India performed during April 2010 and January 2011 in Delhi and nearby regions. The MAX-DOAS instrument was mounted on a car roof, which allowed us to perform measurements along individual driving routes. From car MAX-DOAS observations along closed circles around Delhi, together with information on wind speed and direction, the NO x emissions from the greater Delhi area were determined: our estimate of 4.4 × 10 25 molecules s −1 is found to be slightly lower than the corresponding emission estimates using the EDGAR emission inventory and substantially smaller compared to a recent study by Gurjar et al. (2004). We also determined NO x emissions from Delhi using OMI satellite observations on the same days. These emissions are slightly smaller than those from the car MAX-DOAS measurements. Finally the car MAX-DOAS observations were also used for the validation of simultaneous OMI satellite measurements of the tropospheric NO 2 VCD and found a good agreement of the spatial patterns. Concerning the absolute values, OMI data are, on average, higher than the car MAX-DOAS observations close to strong emission sources, and vice versa over less polluted regions. Our results indicate that OMI NO 2 VCDs are biased low over strongly polluted regions, probably caused by inadequate apriori profiles used in the OMI satellite retrieval.

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Section: Introductionmentioning

confidence: 99%

Estimation of NOx emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data

et al. 2011

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“…The assumption by Johansson et al (2008) and Rivera et al (2009) that around noon the slant column densities for the zenith viewing direction approximate those of the vertical columns is now adopted. The tropospheric vertical columns obtained from the MAX-DOAS observation at the time the mobile DOAS passes its location (Fig.…”

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confidence: 99%

“…and area sources (e.g., cities and industrial areas). Johansson et al (2008Johansson et al ( , 2009 and Rivera et al (2009) examined the outflow of SO 2 , NO 2 , and HCHO in Mexico, Beijing and the Tula industrial area in the city of Mexico. NO x emissions in Mannheim and Ludwigshafen, Germany, using mobile MAX-DOAS (multi-axis differential optical absorption spectroscopy) were investigated by Ibrahim et al (2010).…”

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confidence: 99%

Observations of SO2 and NO2 by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010

Xie

et al. 2013

Atmos. Meas. Tech.

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Abstract. Mobile passive differential optical absorption spectroscopy measurements of SO2 and NO2 were performed in the Guangzhou eastern area (GEA) during the Guangzhou Asian Games 2010 from November 2010 to December 2010. The observations were carried out between 10:00 to 13:00 (local time, i.e., during daylight). Spatial and temporal distributions of SO2 and NO2 in this area were obtained and emission sources were determined using wind field data. The NO2 vertical column densities were found to agree with Ozone Monitoring Instrument values. The correlation coefficient (referred to as R2) was 0.88 after cloud filtering within a specific ground pixel. During the Guangzhou Asian Games and Asian Paralympics (Para) Games, the SO2 and NOx emissions in the area were quantified using averaged wind speed and wind direction. For times outside the games the average SO2 emission was estimated to be 9.50 ± 0.90 tons per hour and the average NOx emission was estimated to be 5.87 ± 3.46 tons per hour. During the phases of the Asian and Asian Para Games, the SO2 and NOx emissions were reduced by 53.50% and 43.50%, respectively, compared to the usual condition. We also investigated the influence of GEA on Guangzhou University Town, the main venue located northwest of the GEA, and found that SO2 concentrations here were about tripled by emissions from the GEA.

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“…The collected spectra have also been evaluated for O 4 both in the UV and the visible wavelength range and neither of the ranges shows differential O 4 columns above the detection limit and thus no obvious elongation of the optical path length due to radiative transport (Johansson et al, 2008;Wagner et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Mobile mini-DOAS measurement of the outflow of NO2 and HCHO from Mexico City

et al. 2009

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Abstract. We here present the results from mobile measurements using two ground-based zenith viewing Differential Optical Absorption Spectroscopy (DOAS) instruments. The measurement was performed in a cross-section of the plume from the Mexico City Metropolitan Area (MCMA) on 10 March 2006 as part of the MILAGRO field campaign. The two instruments operated in the UV and the visible wavelength region respectively and have been used to derive the differential vertical columns of HCHO and NO 2 above the measurement route. This is the first time the mobile mini-DOAS instrument has been able to measure HCHO, one of the chemically most important and interesting gases in the polluted urban atmosphere.Using a mass-averaged wind speed and wind direction from the WRF model the instantaneous flux of HCHO and NO 2 has been calculated from the measurements and the results are compared to the CAMx chemical model. The calculated flux through the measured cross-section was 1.9 (1.5-2.2) kg/s of HCHO and 4.4 (4.0-5.0) kg/s of NO 2 using the UV instrument and 3.66 (3.63-3.73) kg/s of NO 2 using the visible light instrument. The modeled values from CAMx for the outflow of both NO 2 and HCHO, 1.1 and 3.6 kg/s, respectively, show a reasonable agreement with the measurement derived fluxes.

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Quantification of total emission of air pollutants from Beijing using mobile mini-DOAS

Cited by 64 publications

References 12 publications

Estimation of NO<sub>x</sub> emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data

Estimation of NO<sub>x</sub> emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data

Observations of SO<sub>2</sub> and NO<sub>2</sub> by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010

Mobile mini-DOAS measurement of the outflow of NO<sub>2</sub> and HCHO from Mexico City

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Quantification of total emission of air pollutants from Beijing using mobile mini-DOAS

Cited by 64 publications

References 12 publications

Estimation of NO&lt;sub&gt;x&lt;/sub&gt; emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data

Estimation of NO&lt;sub&gt;x&lt;/sub&gt; emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data

Observations of SO&lt;sub&gt;2&lt;/sub&gt; and NO&lt;sub&gt;2&lt;/sub&gt; by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010

Mobile mini-DOAS measurement of the outflow of NO&lt;sub&gt;2&lt;/sub&gt; and HCHO from Mexico City

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Estimation of NO<sub>x</sub> emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data

Estimation of NO<sub>x</sub> emissions from Delhi using Car MAX-DOAS observations and comparison with OMI satellite data

Observations of SO<sub>2</sub> and NO<sub>2</sub> by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010

Mobile mini-DOAS measurement of the outflow of NO<sub>2</sub> and HCHO from Mexico City