Journal article
Improved western U.S. background ozone estimates via constraining nonlocal and local source contributions using Aura TES and OMI observations
Journal of Geophysical Research: Atmospheres, Vol.120(8), pp.3572-3592
04/27/2015
DOI: 10.1002/2014JD022993
Abstract
Western U.S. near‐surface ozone (O3) concentrations are sensitive to transported background O3 from the eastern Pacific free troposphere, as well as U.S. anthropogenic and natural emissions. The current 75 ppbv U.S. O3 primary standard may be lowered soon, hence accurately estimating O3 source contributions, especially background O3 in this region has growing policy‐relevant significance. In this study, we improve the modeled total and background O3, via repartitioning and redistributing the contributions from nonlocal and local anthropogenic/wildfires sources in a multi‐scale satellite data assimilation system containing global Goddard Earth Observing System–Chemistry model (GEOS‐Chem) and regional Sulfur Transport and dEposition Model (STEM). Focusing on NASA's ARCTAS (Arctic Research of the Composition of the Troposphere from Aircraft and Satellites) field campaign period in June–July 2008, we first demonstrate that the negative biases in GEOS‐Chem free simulation in the eastern Pacific at 400–900 hPa are reduced via assimilating Aura‐Tropospheric Emission Spectrometer (TES) O3 profiles. Using the TES‐constrained boundary conditions, we then assimilated into STEM the tropospheric nitrogen dioxide (NO2) columns from Aura‐Ozone Monitoring Instrument to indicate U.S. nitrogen oxides (NOx = NO2 + NO) emissions at 12 × 12 km2 grid scale. Improved model skills are indicated from cross validation against independent ARCTAS measurements. Leveraging Aura observations, we show anomalously high wildfire NOx emissions in this summer in Northern California and the Central Valley while lower anthropogenic emissions in multiple urban areas than those representing the year of 2005. We found strong spatial variability of the daily maximum 8 h average background O3 and its contribution to the modeled total O3, with the mean value of ~48 ppbv (~77% of the total).
Key Points
-Multi‐scale assimilation reassessed O3 source contributions in CA and NV
-Background/total O3 varied in high‐elevation remote areas and flat urban areas
-Background O3 in five subregions on days of O3 exceedances was computed
Details
- Title: Subtitle
- Improved western U.S. background ozone estimates via constraining nonlocal and local source contributions using Aura TES and OMI observations
- Creators
- Min Huang - Now at NOAA Center for Weather and Climate PredictionKevin W Bowman - California Institute of TechnologyGregory R Carmichael - University of IowaMeemong Lee - California Institute of TechnologyTianfeng Chai - NOAA Air Resources LaboratoryScott N Spak - University of IowaDaven K Henze - University of ColoradoAnton S Darmenov - NASA Goddard Space Flight CenterArlindo M Silva - NASA Goddard Space Flight Center
- Resource Type
- Journal article
- Publication Details
- Journal of Geophysical Research: Atmospheres, Vol.120(8), pp.3572-3592
- DOI
- 10.1002/2014JD022993
- ISSN
- 2169-897X
- eISSN
- 2169-8996
- Number of pages
- 21
- Grant note
- NASA Aura‐TES project
- Language
- English
- Date published
- 04/27/2015
- Academic Unit
- Civil and Environmental Engineering; Nursing; Public Policy Center (Archive); Chemical and Biochemical Engineering; School of Planning and Public Affairs
- Record Identifier
- 9983992002502771
Metrics
18 Record Views