Exploiting satellite measurements to explore uncertainties in UK bottom-up NOx emission estimates
Atmospheric Chemistry and Physics(2022)
摘要
Abstract. Nitrogen oxides (NOx, NO + NO2) are potent air pollutants which
directly impact on human health and which aid the formation of other
hazardous pollutants such as ozone (O3) and particulate matter. In this
study, we use satellite tropospheric column nitrogen dioxide (TCNO2)
data to evaluate the spatiotemporal variability and magnitude of the United
Kingdom (UK) bottom-up National Atmospheric Emissions Inventory (NAEI)
NOx emissions. Although emissions and TCNO2 represent different
quantities, for UK city sources we find a spatial correlation of
∼0.5 between the NAEI NOx emissions and TCNO2 from
the high-spatial-resolution TROPOspheric Monitoring Instrument (TROPOMI),
suggesting a good spatial distribution of emission sources in the inventory.
Between 2005 and 2015, the NAEI total UK NOx emissions and long-term
TCNO2 record from the Ozone Monitoring Instrument (OMI), averaged over
England, show annually decreasing trends of 4.4 % and 2.2 %,
respectively. Top-down NOx emissions were derived in this study by
applying a simple mass balance approach to TROPOMI-observed downwind NO2 plumes from city sources. Overall, these top-down estimates were
consistent with the NAEI, but for larger cities such as London and
Birmingham the inventory is significantly (>25 %) less than
the top-down emissions.
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