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TES Data User Session

TES Science Team Meeting – Feb 2009. TES Data User Session. Susan Kulawik Ming Luo Greg Osterman TES Science Team Jet Propulsion Laboratory/California Institute of Technology. TES Data Products. TES Data Products. TES Data Products. Research Products: Ammonia Methanol Carbon Dioxide.

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TES Data User Session

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  1. TES Science Team Meeting – Feb 2009 TES Data User Session Susan Kulawik Ming Luo Greg Osterman TES Science Team Jet Propulsion Laboratory/California Institute of Technology

  2. TES Data Products

  3. TES Data Products

  4. TES Data Products Research Products: Ammonia Methanol Carbon Dioxide

  5. Where to get TES Data/Documentation • The primary location for obtaining TES data is the Earth Observing System (EOS) Data Gateway https://wist.echo.nasa.gov/api/. This site makes available earlier versions of the TES data. • A secondary location for obtaining TES data is the Langley ASDC data pool. The data pool has space limitations that make it somewhat dynamic, therefore older versions of TES data may not be available there. http://eosweb.larc.nasa.gov/PRODOCS/tes/table_tes.html • Aura Data Validation Center – (Subsetting, validation data) http://avdc.gsfc.nasa.gov/ • Documentation available at the Langley ASDC site and the TES website: http://tes.jpl.nasa.gov/

  6. Documentation & Readers TES Quick Start Guide – In development TES Data User’s Guide v4.0 – Completed will be available within a couple of weeks on the TES web sites TES L2 Data Product Specification v11.8 – Provides information on all TES Level 2 data fields TES L2 Validation Report v4.0 – Nearly complete (available in April 2009) L2 Data Readers (in IDL) available at the Langley ASDC Ozone “C-Curve” flag routines (IDL) available at ASDC soon

  7. TES Nadir Observations TES Footprint 5 x 8 km Global Survey footprints 180 km apart Every 2 days… ~703 and counting Step & Stare footprints 45 km apart Special observation ~1747 run as Feb 2009 Transect footprints 12 km apart Special observation ~192 run as of Feb 2009

  8. TES Special Observations Stare 32 scans at same target Special observation ~65 run as of 2/2009 Step & Stare footprints 45 km apart Special observation ~1747 run as Feb 2009

  9. Elevated CO and O3 over SE Texas observed from TES on Aug 23, 2006 Step & Stare footprints 45 km apart Special observation ~1747 run as Feb 2009

  10. Using Satellite Data to Study Air Pollution andPotential Health Impacts - Continued Aura Contribution: Using OMI/MLS products to map tropospheric ozone along with the ability of TES to provide vertical information on ozone and carbon monoxide in the troposphere to help the EPA to understand air pollution events TES Contribution: TES provided special observations across the US/Mexico border near San Diego and El Paso Future Work: The work in this project is a first step and provides insight into how the NASA satellite data might be used with EPA tools and health data for studying air pollution events and their health impacts Transect footprints 12 km apart Special observation ~192 run as of Feb 2009 TES special observation near San Diego on June 9, 2007 showing high levels of ozone in the lower troposphere on the US side of the border

  11. TES Stare Observations Stare 32 scans at same target Special observation ~65 run as of 2/2009 Stare observations used mostly for validation (ARC-IONS, other ozonesonde sites)

  12. Global Survey Changes 2008 AGU Joint Assembly

  13. Visualization of TES Special Observations http://tes.jpl.nasa.gov/visualization/l2plots/ 2008 AGU Joint Assembly

  14. Special Observation Visualizations 2008 AGU Joint Assembly

  15. Run ID Table http://tes.jpl.nasa.gov/data/datacalendar/

  16. Visualization of GS, Time Trends

  17. TES Level 2 Data Version 3 • The Version 3 TES data includes: • Limb profiles valid into the upper troposphere • Improvements to the temperature retrievals (updated CO2 spectroscopy) • Improvements to the methane retrievals • Species dependent quality control information • Use of GMAO GEOS-5.1.0 products in L2 retrievals • O3, CO, H2O, HDO, TATM , SST validated with known biases • CH4, Limb Products provisionally validated • F04_04 in filename • TES Version 3 data products began processing January 2007 • Complete reprocessing completed (Sep 2004 – Sep 2008) • TES data and documentation can be found: • Langley Atmospheric Science Data Center (http://eosweb.larc.nasa.gov/) • Aura Validation Data Center (http://avdc.gsfc.nasa.gov/) • TES L2 Data User’s Guide available at both sites • TES L2 Validation Report available at both sites

  18. TES Level 2 Data Version 4 • The Version 4 TES data will include: • Limb profiles valid into the upper troposphere • Improvements to the temperature retrievals (updated CO2 spectroscopy) • Improvements to the methane retrievals • Species dependent quality control information • Use of GMAO GEOS-5 products in L2 retrievals • Validation analyses are underway

  19. Version 4 Processing • Began processing in September 2008 • Labels in filename F05_05 and F05_06 • Difference in label depends on the GMAO GEOS version used in the retrievals • Special Observations before October 3, 2008 (Run ID 9168) use GMAO GEOS-5.1.0 • Special Observations after October 3, 2008 (Run ID 9168) use GMAO GEOS-5.1.0 • Global Surveys before September 30, 2008 (Run ID 9131) use GMAO GEOS-5.1.0 • Global Surveys after September 30, 2008 (Run ID 9131) use GMAO GEOS-5.1.0 • Problem found in some ozone retrievals at high surface pressures (>1030 hPa) and in the reporting of some water error matrices • Restart V04 processing in March 2009 with updated L2 retrieval code • Label in filename will be F05_07 • Differentiate GEOS-5.x.0 version by date/run ID • Processing should be complete late in 2009 • Data with label F05_05/F05_06 remain publicly available until F05_07 is processed for a given run ID – usable in scientific analyses

  20. TES Level 2 Data Version 4: Validation Update • The Version 4 TES data has undergone preliminary validation analyses (processing began in early Sep 2008) • Improvements to nadir temperature key feature of V04 data • Bias improved to less than 0.5K compared to sondes at nearly all altitudes • Bias at 400 hPa is ~0.7K • See R Herman et al. poster presentation on Wednesday • TES nadir methane retrievals processed as “representative tropospheric VMR” are biased 3-4% high relative to aircraft data • See V Payne et al., presentation – Wed 4:45 • Minor changes to ozone retrievals • High bias of 3-10 ppbv (sondes) in V02 data • V02, V03 and V04 data consistent • More successful quality retrievals in V04 • Fewer cases with anomalous high ozone at surface in V04 • V04 carbon monoxide, nadir water, HDO, limb products consistent with V03

  21. Recommendations when using TES ozone data • V02 data is a thoroughly validated version of the TES nadir ozone product • V03 data is largely consistent with V02 (as suggested by lidar and total column comparisons) • Some spatial differences (observed in monthly maps). • Differences in the occurrence of high surface/very low mid troposphere ozone cases (referred to as “C-curve” cases) observed in comparisons to ozonesondes • V04 data validation is currently ongoing, early results suggest: • Higher number of good ozone profiles compared to V03 • A decrease of more than 50% in C-curve cases compared to V03 • There will be a full sonde validation analysis for V04 data and could be expanded to include the TES limb ozone product

  22. Recommendations when using TES ozone data • C-curve ozone profiles in TES data occur in ~5% of the V03 ozone retrievals • C-curve profiles tend to be a problem in the following cases: • Tropical observations • Locations very close to land/sea boundaries • Mountainous terrain • Desert terrain • In these observing locations, the data user should use both the ozone master quality flag and test for C-curve cases • The V03 TES ozone master quality flag does not include a condition for C-curve cases. • No C-curve flag in the V03 data product • Pseudo-code for a C-Curve flag is available in the TES L2 Data User’s Guide • The V04 TES ozone master quality flag also does not include a condition for C-curve cases • There is a C-curve flag included in the data product based on the pseudo-code described in the Data User’s Guide.

  23. Recommendations when using TES ozone data • Lin Zhang at Harvard University has developed an alternate test for C-curve profile in the TES ozone product • Preliminary tests with V03 data show it to be very effective at screening out potentially anomalous high surface ozone values • Pseudo-code for this version of the flag will be included in the Data User’s Guide • TES ozone profiles flagged as C-curve cases are likely anomalous, but not necessarily always that way. • The flag could screen out actual cases of high ozone in the lowest portion of the troposphere.

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