x and NO x emissions over North America Daniel Jacob Viral Shah Ruijung Dang Laura Yang Shah et al in prep Dang et al in prep Lowest 2 km contributes only 30 of tropospheric NO ID: 1045451
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1. Exploiting TEMPO NO2 observations to better understand background NOx and NOx emissions over North America Daniel Jacob, Viral Shah, Ruijung Dang, Laura YangShah et al., in prep.; Dang et al., in prep.Lowest 2 km contributes only 30% of tropospheric NO2 seen by satellite in summer, 70% in winter; model simulation of free troposphere is critical for interpretation of tropospheric NO2 columnsAircraft NO2 measurements above 6 km have positive interference, better to use NO and PSS for model evaluationImproved GEOS-Chem includes nitrate photolysis, updated aircraft emissionsIncreasing aircraft emissions and fires may drive increase in background, affecting satellite trendsTEMPO may enable improved cloud slicing to separate free tropospheric NO2.
2. AMF contribution to diurnal cycle of TEMPO NO2Diurnal cycle of NO2 over Seoul during KORUS-AQRush hour happens at a difficult time for boundary layer modelingLow sun angle, collapsed mixed layer leads to increased importance of backgroundNeed to understand diurnal cycle of AMF and its contribution to diurnal cycle of NO2 observed by TEMPOYang et al., in prep.