June 06, 2012 Thunder Basin, WY Stratospheric Intrusion (SI) event

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Presentation transcript:

June 06, 2012 Thunder Basin, WY Stratospheric Intrusion (SI) event

310K O3 from RAQMS/WRF-CHEM Simulation 00Z 05/30 – 00Z 06/07, 2012 Stratosphere/tropospheric exchange processes within a quasi-stationary low pressure system over the Gulf of Alaska played a critical role in the SI event

310K O3 from RAQMS/WRF-CHEM Simulation Southeasterly transport of stratospheric air along the 310K isentropic surface leads to the SI event sampled by the AJAX flight over CA on June 5, 2012

RAQMS Nested RAQMS/WRFCHEM 310K isentrope NASA AJAX Flight 47, June 5, 2012 Nested RAQMS/WRFCHEM simulations significantly improve the agreement with AJAX measurements during the off-shore spiral (B) but still underestimate ozone within the narrow filament sampled during the spiral over the San Joaquin Valley, CA (A) (A)(B) (A)(B) RAQMS (red) AJAX (black) WRFCHEM (red) AJAX (black)

Improved estimates of ozone within the SI event lead to significant improvements (19.3 vs 31.8ppbv daytime bias) in predictions of ozone at the Thunder Basin, WY surface site in the nested RAQMS/WRF-CHEM simulation. However, peak ozone mixing ratios are still underestimated by nearly 30ppbv June 6-7, 2012 Surface ozone comparison: Thunder Basin, WY Surface O3 from AIRNow and Nested RAQMS/WRF-CHEMSurface O3 from AIRNow and RAQMS RAQMS Nested RAQMS/WRFCHEM RAQMS (red) AIRNow (black) WRFCHEM (red) AIRNow (black)

A. R. Russell, L. C. Valin, and R. C. Cohen, Trends in OMI NO2 observations over the United States: effects of emission control technology and the economic recession. Atmos. Chem. Phys., 12, 12197–12209, doi: /acp NO2 trends associated with Oil and Gas Extraction

Salt Lake City Phoenix Denver NW Background N Background SW Background E Background SE Background Uinta Basin San Juan Basin Denver- Julesburg Basin Powder River Basin Green River Basin Piceance Basin Williston Basin WRAP WestJumpAQMS Phase III O&G NO2 modeled/gridded emissions (all area sources) Provided by Tom Moore WRAP

VIIRS DNB cloud cleared radiance composite (2012/4/18-26 and 2012/10/11-23) (15 arc second) Provided by NOAA NGDC Salt Lake City Phoenix Denver NW Background N Background SW Background E Background SE Background Uinta Basin San Juan Basin Denver- Julesburg Basin Powder River Basin Green River Basin Piceance Basin Williston Basin

2008 vs 2011 OMI BEHR NO2 column Region A: Salt Lake City (OMI BEHR NO2 retrieval provided by Ron Cohen) General declines in mean and median NO2 columns within the WestJumpAQMS urban OMI NO2 between 2008 and 2011.

2008 vs 2011 OMI BEHR NO2 column Region E: Williston Basin (OMI BEHR NO2 retrieval provided by Ron Cohen) Williston Basin shows (decrease/increase) in the frequency of (low/high) NO2 columns, respectively

STEM NO 2 : Model-Obs along DC-8 flights in ppb Impact of assimilating OMI NO 2 columns in STEM (before/after assimilation) on near-surface (< 2 km a.g.l.) NO 2 along DC-8 flights Assimilation of OMI reduced NO 2 mixing ratios along DC-8 by ~10%, and the error by ~8%, mostly occurred in the valley and the Bay area 10 −9 kg/s/m 2 Before After Assimilation of OMI reduced NOx emissions by ~1.7%: -(5-20)% urban areas; >+80% at some fire locations Slides from Min Huang AQAST 6 th Biannual

Impact of assimilating OMI NO 2 columns on STEM ozone: Change in absolute mixing ratios near the surface Contributions from US emissions on modeled ozone decreased by up to ~5 ppb after the assimilation. This drop in ozone compensated the increases resulted from assimilating TES in GEOS-Chem - We repartitioned the ozone contributions from local and non-local sources. Period-mean near-surface (<~2 km a.g.l.) daytime ozone After assimilation After-Before Slides from Min Huang AQAST 6 th Biannual

Mean: Mean: Mean: 0.10 Mean: 0.07 Impact of assimilating OMI NO 2 columns on STEM ozone: Fractional bias (unitless): 2x(model-obs)/(model+obs) Period-mean surface (AQS & CASTNET) daily-max 8h average ozone Period-mean “near-surface” (< 2 km a.g.l.) ozone along DC-8 flights Assimilation reduced the positive biases near Sacramento-Fresno regions by Not much improvement near the Bay area (VOC-limited chemical regime affected) Before After Slides from Min Huang AQAST 6 th Biannual