1. M ULTI-FREQUENCY MICROWAVE EMISSION OF THE EAST ANTARCTIC PLATEAU IGARSS- Vancouver – July 24-29 2011 Marco Brogioni G.Macelloni, S. Pettinato CNR-IFAC R. Zasso, A. Crepaz CVA-ARPAV B. Padovan, J. Zaccaria PNRA M. Drinkwater ESA-ESTEC

6. The DOMEX Campaign Concordia base Air temperature Mean: - 53 degs Max: - 23 degs Min: - 78 degs TOWER VIEW

7. Complementary Snow measurements Winter Summer Snow layers: Temperature Hardness Density Grains shape and Size Dielectric Constant Snow deposition: Grains shape and Size Classification(precipitation, hoar,wind, etc.)

8. Domex -2 – 2009 campaign Theta = 42° SMOS angle Power Failure > 10 days Radomex Temperature < -60°C !!! No temperature control  Low temperature /High fluctuation

9. Temporal Stability – corrected values 6 Months Scale = December 2008 – May 2009

10. Domex-2 : 2010 campaign 11 months data Power Failure PC crash April 10 Problem Solved –July 2010

11. SMOS comparison - Temporal Trends The target response is very stable. Fluctuation are typical of the SMOS data. Domex Tb could be used as a benchmark for improve SMOS data? some jumps: surface effect (?)

12. Possible Explaination: wind effect Lines= High Wind Speed (> 7 m/s)

13. DOMEX- Angular Trend

14. SMOS – comparison: Angular Trend SMOS data provided by CESBIO dots – SMOS lines - DOMEX

15. Multi-frequency Tb data: temporal trends Obs. angle 55 deg Mean Std Dev V pol H pol almost a Black Body V pol fluctuates less because of the Brewster angle! L C X Ku Ka 175 153.16 152.84 154.70 150.36 - 1.15 1.29 1.65 2.12 L C X Ku Ka 218 200.23 194.93 184.83 169.88 - 0.50 0.57 0.81 1.80

16. Tb – StdDev vs Frequency (AMSR-E & DOMEX) Tb sdev decreases when frequency decreases The site is stable at L band

22. RADOMEX looking in the Antarctic night Thanks for the attention!