1. Page 1© Crown copyright 2004 Initial results from Tropospheric Airborne Meteorological Data Reporting (TAMDAR) evaluation Dr J. Nash and M. Smees

2. Page 2© Crown copyright 2004 TAMDAR v Radiosonde  For the first look we manually searched and sorted TAMDAR data and operational radiosonde ascents for comparison with the RSKOMP radiosonde comparison software.  Radiosonde ascents were selected from stations that were closely located to airports where aircraft fitted with TAMDAR units operate,  and sonde ascents chosen that were within an hour of take off or landing.

3. Page 3© Crown copyright 2004 Humidity Direct difference and Flight-by-flight differences 0 to 1km

4. Page 4© Crown copyright 2004 Humidity Flight-by-flight differences and Flight-by flight Standard Deviation 0 to 1km

5. Page 5© Crown copyright 2004 Humidity Direct difference and Flight-by-flight differences 1 to 2km

6. Page 6© Crown copyright 2004 Humidity Flight-by-flight differences and Flight-by flight Standard Deviation 1 to 2km

7. Page 7© Crown copyright 2004 Humidity Direct difference and Flight-by-flight differences 2 to 3km

8. Page 8© Crown copyright 2004 Humidity Flight-by-flight differences and Flight-by flight Standard Deviation 2 to 3km

9. Page 9© Crown copyright 2004 Humidity Direct difference and Flight-by-flight differences 3 to 4km

10. Page 10© Crown copyright 2004 Humidity Flight-by-flight differences and Flight-by flight Standard Deviation 3 to 4km

11. Page 11© Crown copyright 2004 Temperature flight-by-flight differences and flight- by-flight Standard Deviation

12. Page 12© Crown copyright 2004 Flight 4. RS80 from White Lake and TAMDAT unit 228 taking off from Detroit

13. Page 13© Crown copyright 2004 Location of aircraft and radiosonde at Detroit