Quantification of nitrogen oxides emissions from build-up of pollution over Paris with TROPOMI

Abstract

Nitrogen dioxide (NO2) is a regulated air pollutant that is of particular concern in many cities, where concentrations are high. Emissions of nitrogen oxides to the atmosphere lead to the formation of ozone and particulate matter, with adverse impacts on human health and ecosystems. The effects of emissions are often assessed through modeling based on inventories relying on indirect information that is often outdated or incomplete. Here we show that NO2 measurements from the new, high-resolution TROPOMI satellite sensor can directly determine the strength and distribution of emissions from Paris. From the observed build-up of NO2 pollution, we find highest emissions on cold weekdays in February 2018, and lowest emissions on warm weekend days in spring 2018. The new measurements provide information on the spatio-temporal distribution of emissions within a large city, and suggest that Paris emissions in 2018 are only 5–15% below inventory estimates for 2011–2012, reflecting the difficulty of meeting NOx emission reduction targets.

2013–2019 increases of surface ozone pollution in China: anthropogenic and meteorological influences

“…have been scaled to the OMI data for that year with the multiplicative factor indicated in legend. The low bias for 10 TROPOMI NO2 is similar with the finding by Lorente et al (2019).…”

“…Phys., 18, 14095-14111, http://dx.doi.org/10.5194/acp-18-14095-2018Phys., 18, 14095-14111, http://dx.doi.org/10.5194/acp-18-14095- , 2018 Zhu, L., Mickley, L. J., Jacob, D. J., Marais, E. A., Sheng, J., Hu, L., González Abad, G., and Chance, K.: Long-term (2005Long-term ( -2014 have been scaled to the OMI data for that year with the multiplicative factor indicated in legend. The low bias for TROPOMI NO2 is similar with the finding by Lorente et al (2019). have been scaled to the OMI data for that year with the multiplicative factor indicated in legend.…”

Updated tropospheric chemistry reanalysis and emission estimates, TCR-2, for 2005–2018

“…Meanwhile, TROPOMI provides global maps of the tropospheric NO 2 column on a daily basis with improved accuracy and higher spatial resolution compared with OMI (Griffin et al, 2019). Assimilating TROPOMI NO 2 has potential for improved evaluation of the changing landscape of emissions on urban-to-regional and regional-to-global scales (Lorente et al, 2019). Assimilation of other retrievals such as OMI and TROPOMI CH 2 O; CrIS Isoprene (Fu et al, 2019); and TES, CrIS, and IASI NH 3 (Shephard and Cady-Pereira, 2015) would also help improve the model chemistry and tropospheric ozone reanalysis.…”

“…These ozone precursors are largely controlled by anthropogenic and natural emissions, e.g., transportation, industry, lightning, biogenic and biomass burning sources. Analyses of co-emitted species have been used to explain emission and ozone production processes (e.g., Mauzerall et al, 1998;Ryerson et al, 1998).…”

An updated tropospheric chemistry reanalysis and emission estimates, TCR-2, for 2005–2018

“…Meanwhile, TROPOMI provides global maps of the tropospheric NO 2 column on a daily basis with improved accuracy and higher spatial resolution compared with OMI (Griffin et al, 2019). Assimilating TROPOMI NO 2 has potential for improved evaluation of the changing landscape of emissions on urban-to-regional and regional-to-global scales (Lorente et al, 2019). Assimilation of other retrievals such as OMI and TROPOMI CH 2 O, CrIS Isoprene (Fu et al, 2019), and TES, CrIS, and IASI NH 3 (Shephard and Cady-Pereira, 2015) would also help improve the model chemistry and tropospheric ozone reanalysis.…”