The 2005 and 2006 DANDELIONS NO2 and aerosol intercomparison campaigns

Brinksma, E. J.; Pinardi, Gaia; Volten, H.; Braak, R.; Richter, Andreas; Schönhardt, Anja; Roozendael, Van M; Fayt, C.; Hermans, Christian; Dirksen, R.; Vlemmix, Tim; Berkhout, A. J. C.; Swart, D. P. J.; Oetjen, H.; Wittrock, F.; Wagner, Thomas; Ibrahim, O.; Leeuw, de G; Moerman, Marcel; Curier, R.L.; Celarier, E. A.; Cede, Alexander; Knap, Wouter; Veefkind, J. P.; Eskes, H. J.; Allaart, M.; Rothe, Rasmus; Piters, A. J. M.; Levelt, P.

doi:10.1029/2007jd008808

Cited by 137 publications

(172 citation statements)

References 34 publications

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“…The slope of the correlations was found to be 0.69 ± 0.04, indicating a negative bias in the OMI data by 31 ± 4%. This is consistent with other validation studies (e.g., Celarier et al 2008). After the estimated bias was taken into account, the mean trend over the industrial area of China (30° 40°N and 110° 123°E) was estimated to be about 5 ± 3% per year ((7 ± 5) × 10 14 molecules cm 2 per year) for 2005 2008.…”

Section: Discussionsupporting

confidence: 90%

“…The correlation coefficient for the regression analysis (R 2 ) is as high as 0.64, indicating that the relative changes seen in OMI data are very accurate. The regression line has a slope of 0.69 ± 0.04, indicating a negative bias of 31 ± 4% on average in the OMI data analyzed here, consistent with other validation comparisons, which suggested a negative bias of about 15 30% (e.g., Celarier et al 2008).…”

Section: Omisupporting

confidence: 90%

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Characterization of OMI Tropospheric NO2 Measurements in East Asia Based on a Robust Validation Comparison

Irie

Kanaya

Takashima

et al. 2009

SOLA

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In the period from June 2006 to December 2008, we measured the tropospheric nitrogen dioxide (NO2 ) column by ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) at an urban site in China (Tai'an) and three sites in Japan, covering urban (Yokosuka), suburban (Tsukuba), and remote areas (Hedo). This robust dataset is used to characterize Ozone Monitoring Instrument (OMI) tropospheric NO2 column data (the standard product, version 3). Correlations between MAX-DOAS and OMI data, both of which show very low NO2 at Hedo and moderate/high levels at the other sites, have correlation coefficients (R 2 ) as high as 0.64, indicating that relative changes in OMI NO2 data are reliable. However, OMI data have a negative bias of 31% on average. Assuming that these results are valid for OMI data taken over China, we find an increasing trend in tropospheric column NO2 at about 5% per year on average in the industrial areas of China (30° 40°N and 110° 123°E) over 2005 2008, but its spatial distribution is highly inhomogeneous.

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Section: Discussionsupporting

confidence: 90%

Section: Omisupporting

confidence: 90%

Characterization of OMI Tropospheric NO2 Measurements in East Asia Based on a Robust Validation Comparison

Irie

Kanaya

Takashima

et al. 2009

SOLA

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“…For each scan, VCD a is derived using the geometrical approximation method; that is, the SO 2 layer is assumed to be located below the scattering altitude at 30 • EVA, so that tropospheric SO 2 VCDs can be derived by applying a geometrical air mass factor (AMF) to measured 30 • EVA DSCDs (Hönninger et al, 2004;Brinksma et al, 2008; see also Hendrick et al, 2014). In case of aerosols, a fixed AOD of 0.2 is used.…”

Section: Atmosmentioning

confidence: 99%

Evaluation of tropospheric SO2 retrieved from MAX-DOAS measurements in Xianghe, China

et al. 2014

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Abstract. Ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements of sulfur dioxide (SO 2 ) have been performed at the Xianghe station (39.8 • N, 117.0 • E) located at ∼ 50 km southeast of Beijing from March 2010 to February 2013. Tropospheric SO 2 vertical profiles and corresponding vertical column densities (VCDs), retrieved by applying the optimal estimation method to the MAX-DOAS observations, have been used to study the seasonal and diurnal cycles of SO 2 , in combination with correlative measurements from in situ instruments, as well as meteorological data. A marked seasonality was observed in both SO 2 VCD and surface concentration, with a maximum in winter (February) and a minimum in summer (July). This can be explained by the larger emissions in winter due to the domestic heating and, in case of surface concentration, by more favorable meteorological conditions for the accumulation of SO 2 close to the ground during this period. Wind speed and direction are also found to be two key factors in controlling the level of the SO 2 -related pollution at Xianghe. In the case of east or southwest wind, the SO 2 concentration does not change significantly with the wind speed, since the city of Tangshan and heavy polluting industries are located to the east and southwest of the station, respectively. In contrast, when wind comes from other directions, the stronger the wind, the less SO 2 is observed due to a more effective dispersion. Regarding the diurnal cycle, the SO 2 amount is larger in the early morning and late evening and lower at noon, in line with the diurnal variation of pollutant emissions and atmospheric stability. A strong correlation with correlation coefficients between 0.6 and 0.9 is also found between SO 2 and aerosols in winter, suggesting that anthropogenic SO 2 , through the formation of sulfate aerosols, contributes significantly to the total aerosol content during this season. The observed diurnal cycles of MAX-DOAS SO 2 surface concentration are also in very good agreement (correlation coefficient close to 0.9) with those from collocated in situ data, indicating the good reliability and robustness of our retrieval.

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“…2). This location was chosen because of its unobstructed views close to horizontal at many azimuth angles, its large variability in tropospheric NO 2 , the absence of local pollution sources, good local support because of its closeness to KNMI headquarters in De Bilt near Utrecht, and its tower of height over 200 m. The same site has been used for two previous MAX-DOAS campaigns focusing on validation of satellite observations (Brinksma et al, 2008;Hains et al, 2010). The Cabauw site has a large suite of meteorological instruments deployed continuously, specialising in the boundary layer.…”

Section: The Intercomparison Campaignmentioning

confidence: 99%

Intercomparison of slant column measurements of NO2 and O4 by MAX-DOAS and zenith-sky UV and visible spectrometers

et al. 2010

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Abstract. In June 2009, 22 spectrometers from 14 institutes measured tropospheric and stratospheric NO 2 from the ground for more than 11 days during the Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI), at Cabauw, NL (51.97 • N, 4.93 • E). All visible instruments used a common wavelength range and set of cross sections for the spectral analysis. Most of the instruments were of the multi-axis design with analysis by differential spectroscopy software (MAX-DOAS), whose nonzenith slant columns were compared by examining slopes of their least-squares straight line fits to mean values of a selection of instruments, after taking 30-min averages. Zenith slant columns near twilight were compared by fits Correspondence to: H. K. Roscoe (h.roscoe@bas.ac.uk) to interpolated values of a reference instrument, then normalised by the mean of the slopes of the best instruments. For visible MAX-DOAS instruments, the means of the fitted slopes for NO 2 and O 4 of all except one instrument were within 10% of unity at almost all non-zenith elevations, and most were within 5%. Values for UV MAX-DOAS instruments were almost as good, being 12% and 7%, respectively. For visible instruments at zenith near twilight, the means of the fitted slopes of all instruments were within 5% of unity. This level of agreement is as good as that of previous intercomparisons, despite the site not being ideal for zenith twilight measurements. It bodes well for the future of measurements of tropospheric NO 2 , as previous intercomparisons were only for zenith instruments focussing on stratospheric NO 2 , with their longer heritage.Published by Copernicus Publications on behalf of the European Geosciences Union.

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The 2005 and 2006 DANDELIONS NO₂ and aerosol intercomparison campaigns

Cited by 137 publications

References 34 publications

Characterization of OMI Tropospheric NO2 Measurements in East Asia Based on a Robust Validation Comparison

Characterization of OMI Tropospheric NO2 Measurements in East Asia Based on a Robust Validation Comparison

Evaluation of tropospheric SO<sub>2</sub> retrieved from MAX-DOAS measurements in Xianghe, China

Intercomparison of slant column measurements of NO<sub>2</sub> and O<sub>4</sub> by MAX-DOAS and zenith-sky UV and visible spectrometers

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The 2005 and 2006 DANDELIONS NO2 and aerosol intercomparison campaigns

Cited by 137 publications

References 34 publications

Characterization of OMI Tropospheric NO2 Measurements in East Asia Based on a Robust Validation Comparison

Characterization of OMI Tropospheric NO2 Measurements in East Asia Based on a Robust Validation Comparison

Evaluation of tropospheric SO&lt;sub&gt;2&lt;/sub&gt; retrieved from MAX-DOAS measurements in Xianghe, China

Intercomparison of slant column measurements of NO&lt;sub&gt;2&lt;/sub&gt; and O&lt;sub&gt;4&lt;/sub&gt; by MAX-DOAS and zenith-sky UV and visible spectrometers

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Product

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About

The 2005 and 2006 DANDELIONS NO₂ and aerosol intercomparison campaigns

Evaluation of tropospheric SO<sub>2</sub> retrieved from MAX-DOAS measurements in Xianghe, China

Intercomparison of slant column measurements of NO<sub>2</sub> and O<sub>4</sub> by MAX-DOAS and zenith-sky UV and visible spectrometers