1. Caroline Nowlan, Xiong Liu, Cheng Liu, Gonzalo Gonzalez Abad, Kelly Chance Harvard-Smithsonian Center for Astrophysics, Cambridge, MA James Leitch, Joshua Cole, Tom Delker, Bill Good, Frank Murcray, Lyle Ruppert, Dan Soo Ball Aerospace, Boulder, CO Chris Loughner, Melanie Follette-Cook, Scott Janz, Matt Kowalewski, Ken Pickering NASA GSFC, Greenbelt, MD

2.  New test-bed instrument for the geostationary TEMPO (scheduled for launch 2018-2019) and GEO-CAPE (Decadal Survey) satellite instruments  First flights happened during DISCOVER-AQ on NASA Falcon  Texas 2013 (6 flight days)  Colorado 2014 (12 flight days)

3.  Measures with 2 detector arrays  UV: 280 – 410 nm (O 3, HCHO, SO 2 )  Visible: 416 – 690 nm (NO 2, O 3, aerosols)  2-D CCD array detector  One dimension across flight track and one in wavelength dimension  Resolution at surface:  ~500x500 m 2 (NO 2, HCHO, O 3 )  ~1x1 km 2 (SO 2 )  We retrieve slant columns using nearby zenith-sky reference spectra, then convert to vertical columns with air mass factor from a radiative transfer code (VLIDORT, Spurr et al., 2006) using CMAQ at 4x4 km 2 resolution

4.  Texas campaign:  NO 2 vertical columns available  UV radiance calibration needs refinement  Colorado campaign:  NO 2 and SO 2 slant columns available for 4 of 12 days  To come: Ozone profiles, NO 2 vertical columns, HCHO, more flights to process  First Houston data should be up on DISCOVER- AQ data archive by the end of May.  Contact: cnowlan@cfa.harvard.edu

5. Houston: 09/13, 09/14, 09/18, 09/24 GeoCAPE ocean color flight: 09/17 OMI underflight: 09/16 Transit out (GA power plants): 09/12 Transit back (NC power plants): 09/24 (NO 2 data in red are currently available.)

6. Transit back (power plants, Kansas City, St. Louis): 08/13 Transit out (power plants): 07/25 Denver: 07/29, 07/31, 08/01, 08/02, 08/06, 08/08, 08/10, 08/11 West Colorado power plants: 08/09 Plateville Oil & Gas: 08/03 (NO 2 data in red are currently available.)

7. Vertical Column 13 Sept 2013 10:00-11:30AM 18 Sept 2013 9:00-11:45AM 24 Sept 2013 10:00-11:45AM 14 Sept 2013 2:00-5:00PM

8. Vertical Column

9.  Cloud-free observations Small bias, possible causes to be investigated: Aerosols not currently included in radiative transfer model for air mass factor calculation Effects from zenith sky observations or background offset removal using clean observations over water

10.  Lamsal et al. (2008) method is often used to infer surface mixing ratio from satellite measurements:  Scale satellite vertical column density (VCD) using a model to get surface concentration (S).

12.  Close flights on 13 September 2013 show very similar NO 2  Both analyzed with GeoTASO algorithm

13. 8:00 – 11:30 AM LOCAL TIME 2:00 – 4:00 PM LOCAL TIME Slant Column

14. Photo by J.B. Forbes GeoTASO measured coincident slant columns of NO 2 and SO 2 downwind from Missouri’s largest coal-burning power plant, on transit back to Virginia

15.  O 3 profile work in preparation for TEMPO mission  Formaldehyde retrieval optimization  Aerosol sensitivities in air mass factor  Process rest of Colorado data  Improvements to UV calibration for Houston campaign  Comparisons with GCAS, P-3B and satellites  Responsibility for GeoTASO transferring this year from Ball Aerospace to NASA Goddard (Scott Janz)