Nested Global and Regional aerosol and ozone assimilation and forecasting experiments during the NOAA CalNex field mission R. Bradley Pierce 1, Todd Schaack.

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Presentation transcript:

Nested Global and Regional aerosol and ozone assimilation and forecasting experiments during the NOAA CalNex field mission R. Bradley Pierce 1, Todd Schaack 2, Allen Lenzen 2, Pius Lee 3, Tom Ryerson 4, Ilana Pollack 4,Owen Cooper 4, Chris Hostetler 5, Rich Ferrare 5, David Winker 5 Ilana Pollack 4,Owen Cooper 4, Chris Hostetler 5, Rich Ferrare 5, David Winker 5 1 NOAA/NESDIS/STAR Advanced Satellite Products Branch, Madison WI 2 UW-Madison Space Science and Engineering Center, Madison, WI 3 NOAA ARL, Silver Spring, MD 4 NOAA ESRL Chemical Sciences Division, Boulder, CO 5 NASA Langley Research Center, Hampton, VA

During May-June 2010 the National Oceanic and Atmospheric Administration (NOAA) and the California Air Resources Board (CARB), conducted a joint field study of atmospheric processes over California and the eastern Pacific coastal region called CalNex emphasizing the interactions between air quality and climate change issues. NOAA WP-3D Flight Track Map NOAA CalNex Field Mission

Online global chemical and aerosol assimilation/forecasting system This talk presents results from post mission studies focused on: 1)Evaluation of the RAQMS large-scale ozone and aerosol analyses using airborne, ground based, and satellite measurements during CalNex 2)Evaluation of the RAQMS large-scale ozone and aerosol forecast skill. 3)Nested RAQMS/WRF-CHEM aerosol assimilation studies 4)Nested RAQMS/NAM-CMAQ ozone assimilation studies Real-time assimilation: Microwave Limb Sounder (MLS) stratospheric ozone profiles (above 50mb) Ozone Monitoring Instrument (OMI) total ozone column (cloud cleared) Moderate Resolution Imaging Spectroradiometer (MODIS) Aerosol Optical Depth (AOD) Real-time fire detection: Moderate Resolution Imaging Spectroradiometer (MODIS)

CalNex-2010 O 3 sondes – Owen Cooper (NOAA ESRL) RAQMS NO ASSIM is low biased up to 30% of Ozonesonde CalNex Ozonesonde NO ASSIM Tropospheric low bias

CalNex-2010 O 3 sondes – Owen Cooper (NOAA ESRL) RAQMS MLS+OMI analysis is within 20% of Ozonesonde CalNex Ozonesonde MLS+OMI ASSIM Reduced tropospheric bias

Comparison with NOAA P3 Insitu O3 Measurements (Primarily LA Basin/Central Valley) Assimilation of MLS+OMI O3 retrievals results in increased lower-tropospheric O3 (and improved agreement with airborne insitu O3) over Southern California No AssimMLS+OMI Assim Insitu O3 from Tom Ryerson, NOAA ESRL

V3-01 aerosol profile retrievals 5 o Lat, 10 o Lon, 1km bins CAD< -20, COT=0.0 QC=0,1 (unadjusted retrievals) New 1x1 degree Re-analysis with Corrected dust and Sea-salt aod calculation CALIPSO and Co-located RAQMS AOD May-June 2010 Clear sky CALIPSO scenes are dominated by Saharan Dust and South Asian emissions during May-June 2010 RAQMS overestimates Saharan Dust and SE Asian and S African biomass burning AOD relative to CALIPSO during May-June 2010 Dave Winker, NASA LaRC

1x1 Degree Re-analysis

RAQMS 1x1 Degree Re-analysis Captures Structure of Dust Plume very well CALIPSO vs. RAQMS Extinction 13:52Z 06/01/2010

CALIPSO vs. RAQMS Extinction 03:12Z 06/01/2010 RAQMS 1x1 Degree Re-analysis Captures Structure of Dust Plume Very well

RAQMS 1x1 Degree Re-analysis underestimates Dust Extinction away from source CALIPSO vs. RAQMS Extinction 04:51Z 06/01/2010

V3-01 aerosol profile retrievals 5 o Lat, 10 o Lon, 1km bins CAD< -20, COT=0.0 QC=0,1 (unadjusted retrievals) New 1x1 degree Re-analysis with Corrected dust and Sea-salt aod calculation CALIPSO and Co-located RAQMS AOD May-June 2010 Clear sky CALIPSO scenes are dominated by Saharan Dust and South Asian emissions during May-June 2010 RAQMS overestimates Saharan Dust and SE Asian and S African biomass burning AOD relative to CALIPSO during May-June 2010 Dave Winker, NASA LaRC

Comparison with HSRL Lidar Measurements (Primarily LA Basin, Chris Hostetler, NASA LaRC) RAQMS free tropospheric median aerosol extinction is in very good agreement with HSRL Variability is underestimated, particularly for lower values of aerosol extinction Largest biases are found within the LA Basin Boundary Layer (below 1000m) were RAQMS median extinction is low

Assessment of Global 850mb O3 and Aerosol Extinction Forecast Skill Anomaly Correlations (AC) Correlation between forecast and analysis May-June mean removed Spectrally truncated to wavenumber 20 Averaged from 20N-80N useful Skill

Northern Hemisphere 850mb May-June 2010 Anomaly Correlations (AC) (No Assimilation) useful Skill 850mb ozone forecasts have useful skill past 3 days (significantly better than water vapor) 850mb extinction forecasts do not have useful skill at 1 day

Northern Hemisphere 850mb May-June 2010 Anomaly Correlations (AC) (With MLS/OMI/MODIS Assimilation) useful Skill Assimilation of O3 retrievals results in slight improvements in 850mb ozone forecasts Assimilation of AOD retrievals results in significant improvement in 850mb extinction forecasts with useful skill at ~1.5 days

useful Skill Northern Hemisphere 850mb May-June 2010 Anomaly Correlations (AC) (No Assimilation) Only 850mb SO4 extinction forecasts useful skill past 1 day Black and organic carbon (BC+OC) and dust extinctions are both poorly initialized and forecasted

Northern Hemisphere 850mb May-June 2010 Anomaly Correlations (AC) (With MODIS Assimilation) useful Skill MODIS AOD assimilation results in small changes in 850mb SO4 extinction forecasts MODIS AOD assimilation results in significant improvements in black and organic carbon (BC+OC) and dust forecast skill (dust prediction useful at 2 days)

12km WRF-CHEM 00Z-24Z May 31 st, 2010 RAQMS/WRF-CHEM May-June 2010 aerosol analysis GOCART aerosol module, MODIS AOD assimilation, Two nests: 36km and 12km

WRF-CHEM 12km (NO ASSIM) vs Aeronet Note: need to cloud clear WRF-CHEM analysis to account for miss match between observed and predicted clouds

MODIS AOD assimilation does not have a significant impact on regional scale AOD over CONUS during May-June 2010 Assimilation results in slight reduction in correlation and slight increase in RMS error WRF-CHEM 12km (MODIS ASSIM) vs Aeronet

Development of GOES Total Column Ozone Assimilation Within Operational NAM-CMAQ We currently developing capabilities to assimilate GOES Sounder TCO retrievals into the Community Multi-scale Air Quality (CMAQ; model.org/) model using the NCEP Grid-point Statistical Interpolation (GSI) analysis scheme. model.org/ GOES provides hourly TCO during day and night. OMI daytime TCO is used for bias correction

Three NAM-CMAQ/GOES TCO Experiments have been conducted: RAQMS Lateral Boundary Conditions/default background errors Fixed Lateral Boundary Conditions/default background errors Fixed Lateral Boundary Conditions+GFS UT/LS/GFS background errors Fixed LBC underestimates TCO, Fixed LBC+GFS UT/LS overestimates TCO

RAQMS LBC Default Background Errors FIXED LBC Default Background Errors FIXED LBC +GFS UT/LS GFS Background Errors CalNex-2010 O 3 sondes – Owen Cooper (NOAA ESRL) CalNex Ozonesonde RAQMS LBC and default background errors results in free tropospheric overestimates but good PBL and UT/LS FIXED LBC and default background errors results in free tropospheric and PBL overestimates with UT/LS underestimates FIXED LBC+GFS UT/LS and GFS background errors results in best agreement with IONS ozonesonde

Current Directions Work with NOAA Air Resources Lab and the National Air Quality Forecasting Capability team to test impact of improved vertical resolution on GOES TCO assimilation within NMMB-CMAQ Work with NASA Air Quality Applied Science Team to implement 3D tropospheric POX/LOX within GFS to provide improved time-dependent lateral boundary conditions to NMMB-CMAQ Evaluate the relative impacts of IASI ozone profile and ozone band radiance assimilation on GFS tropospheric ozone distributions Focus on NASA DISCOVER-AQ mission timeframe (July 2011)

I would like to acknowledge Dr. Daewon Byun’s personal contribution to this effort. He conducted the first experiments on assimilation of GOES TCO within CMAQ nearly a decade ago, and always provided enthusiastic support for using satellite measurements to improve regional air quality predictions Benchmark Study conducted in collaboration with EPA/ORD (Alice Gilliland, Ken Schere) and the University of Houston Institute for Multidimensional Air Quality Studies (Daewon Byun)