The AIRS V5 Ozone Validation The AIRS V5 Ozone Validation An Outline of the Paper Submitted To JGR (Presently under review). An Outline of the Paper Submitted To JGR (Presently under review). • • (Let me know if you wish a copy of the paper) (Let me know if you wish a copy of the paper) Evaluation of Atmospheric Infrared Sounder (AIRS) Ozone Profiles and Total Evaluation of Atmospheric Infrared Sounder (AIRS) Ozone Profiles and Total Ozone Retrievals with Matched Ozonesonde Measurements, ECMWF Ozone Data, Ozone Retrievals with Matched Ozonesonde Measurements, ECMWF Ozone Data, and Ozone Monitoring Instrument (OMI) Retrievals* and Ozone Monitoring Instrument (OMI) Retrievals* • On-Going Activities and Upcoming Plans • On-Going Activities and Upcoming Plans Murty Divakarla, Christopher Barnet, Mitchell Goldberg, Eric Maddy, XingpinLiu, Murty Divakarla, Christopher Barnet, Mitchell Goldberg, Eric Maddy, XingpinLiu, Walter Wolf, Lawrence Flynn, Gordon Walter Wolf, Lawrence Flynn, Gordon Labow Labow @ @ , Xiaozhen Xiong, Jennifer Wei, and , Xiaozhen Xiong, Jennifer Wei, and Lihang Zhou Lihang Zhou NOAA/NESDIS, Camp Springs, MD 20746; @NASA/GSFC NOAA/NESDIS, Camp Springs, MD 20746; @NASA/GSFC Bill Irion and Mike Bill Irion and Mike Newchurch Newchurch NASA/JPL, Univ. of Alabama NASA/JPL, Univ. of Alabama Thanks To: Thanks To: Shuntai Shuntai Zhou, NOAA/NCEP, Craig Long, NOAA/NCEP, Eric Beach NOAA, Zhou, NOAA/NCEP, Craig Long, NOAA/NCEP, Eric Beach NOAA, Bojan Bojan Bojkov Bojkov NASA/GSFC NASA/GSFC 1
What We Did What We Did • Validation of AIRS Retrieved Ozone profile, and Total Validation of AIRS Retrieved Ozone profile, and Total • Ozone with WOUDC O 3 SNDS and Total Ozone Ozone with WOUDC O 3 SNDS and Total Ozone Measurements. Measurements. » Both V4 and V5 Versions (Retrieval Emulations at Both V4 and V5 Versions (Retrieval Emulations at » NOAA/NESDIS) NOAA/NESDIS) » AIRS Ozone Profile Retrievals with O AIRS Ozone Profile Retrievals with O 3 SNDS » 3 SNDS » AIRS Total Ozone with BD Measurements AIRS Total Ozone with BD Measurements » – Simultaneous Aqua-AIRS, Aura-OMI and WOUDC Total Simultaneous Aqua-AIRS, Aura-OMI and WOUDC Total – Ozone Measurements Ozone Measurements – Individual – Individual STNs STNs, NH, SH, Tropics, Global , NH, SH, Tropics, Global • Analysis of AIRS Global Ozone Grids Analysis of AIRS Global Ozone Grids • » Using Using Gridded Gridded Monthly Averages (2004 and 2005) of AIRS, Monthly Averages (2004 and 2005) of AIRS, » OMI, SBUV and Global Forecast System (NCEP-GFS) – OMI, SBUV and Global Forecast System (NCEP-GFS) – Seasonal Trends, Patterns Seasonal Trends, Patterns » » How Point Measurements/Validation How Point Measurements/Validation Corroborate to Global Corroborate to Global Perspective Seen with the Global Grids Perspective Seen with the Global Grids » Annual Cycles Annual Cycles » 2
Data Credits and Acknowledgments Data Credits and Acknowledgments » Ozone Ozone sondes sondes and Brewer Dobson Measurements and Brewer Dobson Measurements » – WOUDC Ozone Data WOUDC Ozone Data ( (www.woudc.org www.woudc.org) ) – » Gridded » Gridded Monthly Averages for AIRS, SBU, OMI and GFS Monthly Averages for AIRS, SBU, OMI and GFS for the Years 2004 and 2005 for the Years 2004 and 2005 – – AIRS V4 and V5 Retrievals Emulated at NOAA/NESDIS AIRS V4 and V5 Retrievals Emulated at NOAA/NESDIS Global Grid Resolution: 3 Global Grid Resolution: 3 o x 3 o o x 3 o Generated by NOAA/NESDIS/IOSSPDT Generated by NOAA/NESDIS/IOSSPDT – – V4 and V5 V4 and V5 Emulation Emulation – SBUV/2 on NOAA-16 – SBUV/2 on NOAA-16 Global Grid Resolution: 2.5 Global Grid Resolution: 2.5 o x 2.5 o o x 2.5 o Monthly Data Provided by Monthly Data Provided by Shuntai Zhou Shuntai Zhou, NCEP , NCEP Download : Download : ftp://ftp.cpc.ncep.noaa.gov/SMOBA ftp://ftp.cpc.ncep.noaa.gov/SMOBA – Ozone Monitoring Instrument (OMI) on Aura Ozone Monitoring Instrument (OMI) on Aura – Global Grid Resolution: 1.25 Global Grid Resolution: 1.25 o o x 1.0 x 1.0 o o Downloaded from: Downloaded from: ftp://toms.gsfc.nasa.gov/pub/omi/data/monthly_averages/ozo ftp://toms.gsfc.nasa.gov/pub/omi/data/monthly_averages/ozo ne ne – Global Forecast System (GFS) Global Forecast System (GFS) – Monthly Data provided by Monthly Data provided by Craig Long Craig Long 3 ftp://ftp.cpc.ncep.noaa.gov/long/gfs_ozone/month/ ftp://ftp.cpc.ncep.noaa.gov/long/gfs_ozone/month/
The AIRS Ozone Validation Ladder The AIRS Ozone Validation Ladder 6 5 4 3 2 1 4
What We Did and What is Achieved (1) What We Did and What is Achieved (1) Performed validations for V4 and V5 Performed validations for V4 and V5 • • AIRS Retrieved Ozone Profiles with WOUDC O 3 SNDS AIRS Retrieved Ozone Profiles with WOUDC O 3 SNDS • • Results: Results: • • The V5 algorithm significantly improves the retrieval The V5 algorithm significantly improves the retrieval • • bias and RMS differences for the lower troposphere bias and RMS differences for the lower troposphere and especially over the tropical regions. and especially over the tropical regions. Retrieval Improvement for the Lowest Layer (1000- Retrieval Improvement for the Lowest Layer (1000- • • 260 260 mb mb) is Mainly due to the Climatology First ) is Mainly due to the Climatology First Guess Guess The Retrieval Statistics with Global O 3 SNDS The Retrieval Statistics with Global O 3 SNDS • • Bias ~ 5% Bias ~ 5% • • RMS Difference ~ 20% RMS Difference ~ 20% • • 5
V5 Physical Retrievals - Different Stations V5 Physical Retrievals - Different Stations ALL (N=353), ALL (N=353), STN 089 (N=53, NH), STN 089 (N=53, NH), STN 101(N=50,SH), Tropics (N=54, ±12HR) Tropics (N=54, ±12HR) STN 101(N=50,SH), RMS Difference RMS Difference Bias Bias 10 mb 10 10 V5 Climatology First Guess V5 Climatology First Guess Pressure (hPa) Pressure (hPa) 100 mb Helps Physical Retrival Retrival for for Helps Physical 100 100 the Lowest Layer 1 (1000- the Lowest Layer 1 (1000- 260 mb mb) ) 260 1000 mb 1000 1000 0 20 40 60 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120 140 Ozone RMS Difference (%) Ozone Bias (%) V5.0.7_ALL_3H V4.0_ALL_3H V5.0.7_STN089 V5.0.7_ALL_3H V4.0_ALL_3H V5.0.7_STN089 V4.0_STN089 V5.0.7_STN101 V4.0_STN101 V4.0_STN089 V5.0.7_STN101 V4.0_STN101 V5.0.7_TRP V4.0_TRP V4.0_TRP V5.0.7_TRP -60 -40 -20 0 20 40 60 80 100 0 20 40 60 80 100 120 140 V4 Dotted lines, V5 Solid Lines V4 Dotted lines, V5 Solid Lines ALL_3H STN089 ALL_3H STN089 STN101 STN101 TRP_12H TRP_12H ALL_12H ALL_12H 6
What We Did and What is Achieved (2) What We Did and What is Achieved (2) Performed Validations for V4 and V5 Total Ozone Performed Validations for V4 and V5 Total Ozone • • With WOUDC Brewer/Dobson Station Measurements. With WOUDC Brewer/Dobson Station Measurements. • • Results: Results: • • Total ozone from both the V4 and V5 versions agrees well Total ozone from both the V4 and V5 versions agrees well • • Bias ~ 4% and an RMS difference ~ 8%. Bias ~ 4% and an RMS difference ~ 8%. • • V5 ozone retrievals are better than V4 V5 ozone retrievals are better than V4 » Over Desert Regions (Due to Improvements in » Over Desert Regions (Due to Improvements in Emissivity Emissivity Regression implemented in V5) Regression implemented in V5) » In Depicting Ozone Hole Events, Trends, Seasonality » In Depicting Ozone Hole Events, Trends, Seasonality Patterns etc. Patterns etc. However, V5 Algorithm However, V5 Algorithm Slightly underestimates total ozone in the tropics Slightly underestimates total ozone in the tropics 1. 1. Slightly overestimates total ozone in the midlatitude and Slightly overestimates total ozone in the midlatitude and 2. 2. high latitudes regions. high latitudes regions. 3. Emissivity retrievals may require further refinements. retrievals may require further refinements. 3. Emissivity 7
V5 - Total Ozone Statistics with BD Measurements V5 - Total Ozone Statistics with BD Measurements Polar, Mid-Lat, Tropics, and Global Polar, Mid-Lat, Tropics, and Global AIRSPR_Bias(%) 10 5 V5 Bias V5 Bias V5 Physical Retrieval V5 Physical Retrieval Bias(%) 0 Bias and RMS Bias and RMS POLAR Mid-LAT TROPICS GLOBAL Difference Difference -5 AIRSPR_RMS(%) Slightly underestimates Slightly underestimates -10 25 total ozone in the total ozone in the Region AIRSPR_Bias(%) tropics tropics 20 Slightly overestimates Slightly overestimates V5 RMS V5 RMS 15 total ozone in the total ozone in the RMS (%) midlatitude and midlatitude and 10 polar regions. polar regions. 5 0 POLAR Mid-LAT TROPICS GLOBAL Region Polar Midlat Tropics Global AIRSPR_RMS(%) 8
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