Monitoring Air Quality from Space: The Case for the Geostationary Platform

Lahoz, W. A.; Peuch, Vincent-Henri; Orphal, J.; Attié, Jean-Luc; Chance, K.; Liu, Xueliang; Edwards, D. P.; Elbern, Hendrik; Flaud, J.‐M.; Claeyman, M.; Amraoui, L. El

doi:10.1175/bams-d-11-00045.1

Cited by 46 publications

(51 citation statements)

References 35 publications

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“…A key feature of the system should be the ability to predict and attribute ozone to emissions. A combination of satellites, ground-based remote sensing and ground-based observations are needed with geostationary observations (Lahoz et al, 2011) being an observational anchor (see Fig. 43).…”

Section: Discussionmentioning

confidence: 99%

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer

et al. 2015

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Abstract. Ozone holds a certain fascination in atmospheric science. It is ubiquitous in the atmosphere, central to tropospheric oxidation chemistry, yet harmful to human and ecosystem health as well as being an important greenhouse gas. It is not emitted into the atmosphere but is a byproduct of the very oxidation chemistry it largely initiates. Much effort is focused on the reduction of surface levels of ozone owing to its health and vegetation impacts, but recent efforts to achieve reductions in exposure at a country scale have proved difficult to achieve owing to increases in background ozone at the zonal hemispheric scale. There is also a growing realisation that the role of ozone as a short-lived climate pollutant could be important in integrated air quality climate change mitigation. This review examines current understanding of the processes regulating tropospheric ozone at global to local scales from both measurements and models. It takes the view that knowledge across the scales is important for dealing with air quality and climate change in a synergistic manner. The review shows that there remain a number of clear challenges for ozone such as explaining surface trends, incorporating new chemical understanding, ozone-climate coupling, and a better assessment of impacts. There is a clear and present need to treat ozone across the range of scales, a transboundary issue, but with an emphasis on the hemispheric scales. New observational opportunities are offered both by satellites and small sensors that bridge the scales.

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Section: Discussionmentioning

confidence: 99%

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer

et al. 2015

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“…Satellite observations on the other hand offer a unique opportunity for studying the continuous spatial patterns and the temporal dynamics of the constituents affecting air quality in general (Martin, 2008;Burrows et al, 2011;Lahoz et al, 2012;Duncan et al, 2014) and of tropospheric NO 2 in particular Martin, 2008;Zhou et al, 2012;Castellanos and Boersma, 2012;Schneider and van der A, 2012;Hilboll et al, 2013;Curier et al, 2014).…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Recent satellite-based trends of tropospheric nitrogen dioxide over large urban agglomerations worldwide

Schneider

Lahoz

2015

Atmos. Chem. Phys.

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Abstract. Trends in tropospheric nitrogen dioxide (NO 2 ) columns over 66 large urban agglomerations worldwide have been computed using data from the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) instrument onboard the Envisat platform for the period August 2002 to March 2012. A seasonal model including a linear trend was fitted to the satellite-based time series over each site. The results indicate distinct spatial patterns in trends. While agglomerations in Europe, North America, and some locations in East Asia/Oceania show decreasing tropospheric NO 2 levels on the order of −5 % yr −1 , rapidly increasing levels of tropospheric NO 2 are found for agglomerations in large parts of Asia, Africa, and South America. The site with the most rapidly increasing absolute levels of tropospheric NO 2 was found to be Tianjin in China with a trend of 3.04(±0.47) × 10 15 molecules cm −2 yr −1 , whereas the site with the most rapidly increasing relative trend was Kabul in Afghanistan with 14.3(±2.2) % yr −1 . In total, 34 sites exhibited increasing trends of tropospheric NO 2 throughout the study period, 24 of which were found to be statistically significant. A total of 32 sites showed decreasing levels of tropospheric NO 2 during the study period, of which 20 sites did so at statistically significant magnitudes. Overall, going beyond the relatively small set of megacities investigated previously, this study provides the first consistent analysis of recent changes in tropospheric NO 2 levels over most large urban agglomerations worldwide, and indicates that changes in urban NO 2 levels are subject to substantial regional differences as well as influenced by economic and demographic factors.

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“…In addition to the NASA GEO-CAPE mission, Japanese GMAP-Asia (Geostationary Meteorology and Air PollutionAsia, Akimoto et al, 2008) mission, Korea GEMS (Geostationary Environment Monitoring Spectrometer, Lee et al, 2010) mission, European GMES (Global Monitoring for Environment and Security) Sentinel-4 and Sentinel-5 missions (ESA, 2007;Lahoz et al, 2012;Ingmann et al, 2012) have been proposed for the air quality application. The Canadian PCW/PHEMOS-WCA (Polar Communication and Weather/Polar Highly Elliptical Molniya Orbital ScienceWeather, Climate and Air quality, McConnell et al, 2011) mission proposed to use UV-VIS-TIR spectrometers onboard two satellites, each in a highly eccentric orbit (apogee:…”

Section: Introductionmentioning

confidence: 99%

Characterization of ozone profiles derived from Aura TES and OMI radiances

Worden

Liu

et al. 2013

Atmos. Chem. Phys.

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We present satellite based ozone profile estimates derived by combining radiances measured at thermal infrared (TIR) wavelengths from the Aura Tropospheric Emission Spectrometer (TES) and ultraviolet (UV) wavelengths measured by the Aura Ozone Monitoring Instrument (OMI). The advantage of using these combined wavelengths and instruments for sounding ozone over either instrument alone is improved sensitivity near the surface as well as the capability to consistently resolve the lower troposphere, upper troposphere, and lower stratosphere for scenes with varying geophysical states. For example, the vertical resolution of ozone estimates from either TES or OMI varies strongly by surface albedo and temperature. Typically, TES provides 1.6 degrees of freedom for signal (DOFS) and OMI provides less than 1 DOFS in the troposphere. The combination provides 2 DOFS in the troposphere with approximately 0.4 DOFS for near surface ozone (surface to 700 hPa). We evaluated these new ozone profile estimates with ozonesonde measurements and found that calculated errors for the joint TES and OMI ozone profile estimates are in reasonable agreement with actual errors as derived by the root-mean-square (RMS) difference between the ozonesondes and the joint TES/OMI ozone estimates. We also used a common a priori profile in the retrievals in order to evaluate the capability of different retrieval approaches on capturing near-surface ozone variability. We found that the vertical resolution of the joint TES/OMI ozone profile estimates shows significant improvements on quantifying variations in near-surface ozone with RMS differences of 49.9% and correlation coefficient of R = 0.58 for the TES/OMI near-surface estimates as compared to 67.2% RMS difference and R = 0.33 for TES and 115.8% RMS difference and R = 0.09 for OMI. This comparison removes the impacts of using the climatological a priori in the retrievals. However, it results in artificially large sonde/retrieval differences. The TES/OMI ozone profiles from the production code of joint retrievals will use climatological a priori and therefore will have more realistic ozone estimates than those from using a common a priori volume mixing ratio profile

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Monitoring Air Quality from Space: The Case for the Geostationary Platform

Cited by 46 publications

References 35 publications

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer

Recent satellite-based trends of tropospheric nitrogen dioxide over large urban agglomerations worldwide

Characterization of ozone profiles derived from Aura TES and OMI radiances

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