edu.ucar.opensky::articles:22350 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:40:33.824587 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7cf9t45 https://doi.org/10.5067/Aura/OMI/DATA2017 https Related Dataset #1 OMI/Aura Nitrogen Dioxide (NO2) Total and Tropospheric Column 1-orbit L2 Swath 13x24 km https://doi.org/10.5067/terra/mopitt/mop02j_l2.007 https Related Dataset #2 MOPITT Level 2 Derived CO (Near and Thermal Infrared Radiances) HDF file- Version 7 Quantifying emissions of CO and NOx using observations from MOPITT, OMI, TES, and OSIRIS 2019-01-27T00:00:00Z publication https://n2t.org/ark:/85065/d7cf9t45 https://doi.org/10.1029/2018JD028670 ZHANG, X. author Jones, D. B. A. author Keller, M. author Walker, T. W. author Jiang, Z. author Henze, D. K. author Worden, Helen M. author Bourassa, A. E. author Degenstein, D. A. author Rochon, Y. J. author UCAR/NCAR - Library publisher We use the GEOS-Chem four-dimensional variational data assimilation system to estimate emissions of carbon monoxide (CO) and nitrogen oxides (NOx) in November 2009 and July 2010. We assimilated CO retrievals from The Measurements of Pollution In The Troposphere (MOPITT), ozone (O-3) retrievals from the Tropospheric Emission Spectrometer (TES) and the Optical Spectrograph and InfraRed Imager System (OSIRIS), and NO2 columns from the Ozone Monitoring Instrument (OMI). By assimilating data for multiple chemical species with the four-dimensional variational scheme we obtain a consistent chemical state over the assimilation period. The modeled O-3 bias was reduced to less than 3.5ppbv everywhere, relative to independent aircraft O-3 data, except in the high-latitude upper troposphere and lower stratosphere. We found that in November, the CO and NOx emission estimates obtained with the multiple species assimilation were generally comparable to those inferred from assimilating only MOPITT or OMI data, respectively, whereas in July the differences were larger. For the main anthropogenic source regions, the inferred North American and European emissions responded most strongly to the multispecies information in the assimilation. In July, North American and European CO emission estimates differed by 31% and 65% relative to the MOPITT-only estimates, respectively. We also found large differences for the North American and European NOx emission estimates, which differed by 27% and 16% relative to the OMI-only estimates, respectively. Our results highlight the potential benefit of exploiting the additional constraints offered by multispecies chemical data assimilation. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2019 Author(s). This work is licensed under a Creative Commons Attribution 4.0 International license. None eng geoscientificInformation