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

Abstract

[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.

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

“…Burning of biomass, such as residential cooking and heating, which are sources of non-methane hydrocarbons and NO x , also contribute to tropospheric ozone formation especially in densely populated areas of developing countries. Previous studies connected with the measurement of NO 2 in the TienShan region occurred during the ground-based validation of vertical column NO 2 satellite data (EOS-Aura OMI) in (Ionov et al, 2008. The satellite and ground-based data over Issyk-Kul (~120 km to the west from Lidar-Site) agreed within (~0.26 ± 0.28) × 10 15 molec/cm 2 , with a correlation coefficient of 0.87.…”

“…Monthly average values of NO 2 in the tropospheric column (Boersma et al, 2004), retrieved from the Aura Comparison of Aura OMI vertical column NO 2 data with collocated ground-based measurements showed biases over Kyrgyzstan (Ionov et al, 2008), which can be due to the detection of pollution in the tropospheric by OMI, but not observed in the ground-based measurements, as the zenith sky observation in twilight was slightly sensitive to tropospheric NO 2 . Comparisons with in situ and groundbased data suggest that the OMI tropospheric NO 2 columns are biased by ~5% .…”

“…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).…”

Tropospheric nitrogen dioxide column retrieval from ground-based zenith–sky DOAS observations

“…Several studies (e.g. Solomon et al, 1987;Van Roozendael et al, 1994;Ionov et al, 2008) showed that this uncertainty is of about 10 % at 90 • SZA.…”

Analysis of NO2over the Korean Peninsula from Ozone Monitoring Instrument Satellite Measurements

“…대기의 미량기체 중 이산화질소(NO 2 )는 대기 화학 적으로 큰 영향을 미치는 가스이며 (Sheel et al, 2010;Boersma et al, 2009;Zyrichidou et al, 2009;Ionov et al, 2008), 대표적인 대기 오염원 중 하나이다. 그리고 이산화질소에 노출되어 흡입할 경우 폐질환을 일으 킬 수 있으며 (Cheon et al, 2010) (Han et al, 2011;Wang et al, 2011;Sheel et al, 2010;Chai et al, 2009;Kurokawa et al, 2009;Zyrichidou et al, 2009;Shi et al, 2008;He et al, 2007;Ma et al, 2006), 위성자료와 지상관측 자료 또는 항 공기 관측 자료와의 상호 비교 분석 (Gruzdev and Elokhov, 2010;Lamsal et al, 2010Lamsal et al, , 2008Ionov et al, 2008Ionov et al, , 2006, 위성 간의 상호 비교 분석 Bracher et al, 2005 (Han et al, 2011;Hains et al, 2010; Boersma et al, 2007 3.…”