Validation of GOME (ERS-2) NO2 vertical column data with ground-based measurements at Issyk-Kul (Kyrgyzstan)

Ionov, Dmitry V.; Sinyakov, Valery P.; Semenov, V. K.

doi:10.1016/j.asr.2005.11.011

Cited by 13 publications

(7 citation statements)

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“…In contrast to previous studies, which measured only twilight NO 2 columns (e.g. Petritoli et al, 2004;Ionov et al, 2006b), the present study observed zenith-sky scattered light during the whole day and retrieved the diurnal variation of the total NO 2 columns. By using some simple but rational assumptions, the tropospheric NO 2 columns were extracted from the total ones.…”

Section: Introductioncontrasting

confidence: 42%

Tropospheric NO<sub>2</sub> column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

et al. 2009

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Abstract. Zenith-sky scattered sunlight observations using differential optical absorption spectroscopy (DOAS) technique were carried out in Shanghai, China (31.3 • N, 121.5 • E) since December 2006. At this polluted urban site, the measurements provided NO 2 total columns in the daytime. Here, we present a new method to extract time series of tropospheric vertical column densities (VCDs) of NO 2 from these observations. The derived tropospheric NO 2 VCDs are important quantities for the estimation of emissions and for the validation of satellite observations. Our method makes use of assumptions on the relative NO 2 height profiles and the diurnal variation of stratospheric NO 2 VCDs. The main error sources arise from the uncertainties in the estimated stratospheric slant column densities (SCDs) and the determination of tropospheric NO 2 air mass factor (AMF). For a polluted site like Shanghai, the accuracy of our method is conservatively estimated to be <25% for solar zenith angle (SZA) lower than 70 • . From simultaneously performed longpath DOAS measurements, the NO 2 surface concentrations at the same site were observed and the corresponding tropospheric NO 2 VCDs were estimated using the assumed seasonal NO 2 profiles in the planetary boundary layer (PBL). By making a comparison between the tropospheric NO 2 VCDs from zenith-sky and long-path DOAS measurements, it is found that the former provides more realistic information about total tropospheric pollution than the latter, so it's more suitable for satellite data validation. A comparison between the tropospheric NO 2 VCDs from ground-based zenith-sky measurements and SCIAMACHY was also made. Satellite validation for a strongly polluted area is highly needed, butCorrespondence to: B. Zhou (binzhou@fudan.edu.cn) exhibits also a great challenge. Our comparison shows good agreement, considering in particular the different spatial resolutions between the two measurements. Remaining systematic deviations are most probably related to the uncertainties of satellite data caused by the assumptions on aerosol properties as well as the layer heights of aerosols and NO 2 .

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Section: Introductioncontrasting

confidence: 42%

Tropospheric NO<sub>2</sub> column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

et al. 2009

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“…The Issyk‐Kul station is located in a remote plateau of the Tien Shan mountains in northeast Kyrgyzstan, which is presumed to be a pollution‐free area. Operational GOME measurements of NO 2 VCDs (GOME Data Processor 3 (GDP 3)) have been compared with collocated ground‐based observations at Issyk‐Kul for the period of 1996–2002 [ Ionov et al , 2006a]. According to that study, the GOME data are reasonably close to the corresponding ground‐based sunrise observations, within ±0.7 × 10 15 molecules/cm 2 , while the agreement with ground‐based sunset measurements is not as close, about ±2.2 × 10 15 molecules/cm 2 (RMS).…”

Section: Ground‐based Validation Of Satellite No2 Data: Comparison Mementioning

confidence: 99%

Ground‐based validation of EOS‐Aura OMI NO₂ vertical column data in the midlatitude mountain ranges of Tien Shan (Kyrgyzstan) and Alps (France)

et al. 2008

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[1] Ground-based UV-visible instruments for NO 2 vertical column measurements have been operating at Issyk-Kul station, in Kyrgyzstan, and Observatoire de Haute-Provence (OHP), in France, since 1983 and 1992, respectively. These measurements have already been used for validation of ERS-2 Global Ozone Monitoring Experiment (GOME) and Envisat Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) NO 2 column data. Building upon the successful missions of GOME and SCIAMACHY, the Ozone Monitoring Experiment (OMI) was launched by NASA onboard the EOS Aura satellite in July 2004. Here we present the results of recent comparisons between OMI NO 2 operational data (standard product) and correlative ground-based twilight measurements in midlatitudes, at Issyk-Kul and OHP, in 2004-2006. The stratospheric NO 2 columns, observed by OMI and our ground-based instruments, have been corrected for NO 2 diurnal change and normalized to local noon values using a photochemical box model. According to our comparison, OMI stratospheric NO 2 columns underestimate ground-based measurements by (0.3 ± 0.3) Â 10 15 molecules/cm 2 and (0.7 ± 0.6) Â 10 15 molecules/cm 2 at Issyk-Kul and OHP, respectively. The effect of tropospheric pollution on the NO 2 measurements in both regions of observations has been identified and discussed.

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“…The information is an important step forward in the assessment of air pollution effects and air quality in the Central Asia region, since past studies of trace gases in the region were mainly connected with the ground-based validation of satellite measurements and referred basically to total column amounts rather then tropospheric content (e.g., Ionov et al, 2006Ionov et al, , 2008. These measurements coincide with a larger study that obtained first time particulate matter mass and detailed chemical composition at two sites during the same time period in Central Asia (Miller-Schulze et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Ozone Variations over Central Tien-Shan in Central Asia and Implications for Regional Emissions Reduction Strategies

Chen

Imashev

Sverdlik

et al. 2013

Aerosol Air Qual. Res.

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The variability of total column ozone (TCO) and tropospheric column ozone (TrCO) was examined in Central Asia. Measurements were conducted at the Lidar Station Teplokluchenka in eastern Kyrgyzstan for one year, July 2008-July 2009.TCO was obtained using a handheld Microtops II Ozonometer (TCO-MII) and from the Aura OMI (TCO-OMI) satellite. Nitrogen dioxide (NO 2 ) and formaldehyde concentrations also were obtained from the OMI satellite. Formaldehyde was used as a surrogate for volatile organic compounds. TrCO was estimated by the difference between TCO-OMI and stratospheric column ozone retrieved from the MLS satellite. Comparison of the ground-based TCO-MII with TCO-OMI showed good agreement (r 2 = 0.93), and linear regression between these was used to estimate missing values in the TCO-MII dataset. The contribution of TrCO to TCO varied from 15% in summertime to 5% in winter. High values of TrCO were observed during summer (July: 45 DU) and low values during winter (December: 15 DU), as is typically observed. The average values of TrCO for summer, autumn, winter, and spring were equal to 42, 27, 20, and 30 DU, respectively. Seasonal variability of TrCO corresponded to solar intensity, indicating that TrCO is likely to form through photochemical means rather than stratospheric intrusion.The spatial distribution of NO 2 and VOC were examined to better understand the regional sources of these ozone precursors. Transport from highly populated areas of the Ferghana Valley and Tashkent in Uzbekistan contributed to the TrCO concentrations observed in this work. The HCHO/NO 2 ratio, an indicator of the ozone production rate, suggested that reducing NO 2 would be more effective in reducing TrCO during most of the year, except summer, when reductions of both would likely be needed.

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Validation of GOME (ERS-2) NO2 vertical column data with ground-based measurements at Issyk-Kul (Kyrgyzstan)

Cited by 13 publications

References 13 publications

Tropospheric NO<sub>2</sub> column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

Tropospheric NO<sub>2</sub> column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

Ground‐based validation of EOS‐Aura OMI NO₂ vertical column data in the midlatitude mountain ranges of Tien Shan (Kyrgyzstan) and Alps (France)

Ozone Variations over Central Tien-Shan in Central Asia and Implications for Regional Emissions Reduction Strategies

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Validation of GOME (ERS-2) NO2 vertical column data with ground-based measurements at Issyk-Kul (Kyrgyzstan)

Cited by 13 publications

References 13 publications

Tropospheric NO&lt;sub&gt;2&lt;/sub&gt; column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

Tropospheric NO&lt;sub&gt;2&lt;/sub&gt; column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

Ground‐based validation of EOS‐Aura OMI NO2 vertical column data in the midlatitude mountain ranges of Tien Shan (Kyrgyzstan) and Alps (France)

Ozone Variations over Central Tien-Shan in Central Asia and Implications for Regional Emissions Reduction Strategies

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Tropospheric NO<sub>2</sub> column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

Tropospheric NO<sub>2</sub> column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation

Ground‐based validation of EOS‐Aura OMI NO₂ vertical column data in the midlatitude mountain ranges of Tien Shan (Kyrgyzstan) and Alps (France)