SMOS Science Meeting 26-29 September 2011 Arles, FR Simulating Aquarius by Resampling SMOS Gary Lagerloef, Yann Kerr & Eric Anterrieu and Initial Results.

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Presentation transcript:

SMOS Science Meeting September 2011 Arles, FR Simulating Aquarius by Resampling SMOS Gary Lagerloef, Yann Kerr & Eric Anterrieu and Initial Results from Aquarius Data The Aquarius Team

2 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Part 1: Simulating Aquarius Global Coverage in 7 Days 4 Repeat Cycles per Month Global Coverage in 7 Days 4 Repeat Cycles per Month Sun-synchronous exact repeat orbit 6pm ascending node Altitude 657 km 3 beams 390 km wide swath. 76 x 94 km96 x 156 km 84 x 120 km Beams point toward the night side to avoid sun glint Salinity Data 150km, Monthly, 0.2 (pss) Mission Requirement Salinity Data 150km, Monthly, 0.2 (pss) Mission Requirement In Orbit Chec kout Launch

3 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Cross-track Distance (km) SMOS incidence angles Inter-calibration: To verify that the two sensors produce the same measurement under the same conditions.

4 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Cross-track Distance (km) Inter-calibrate with beams at Aquarius incidence angles 10 G.Lagerloef, Feb 2009

5 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation SMOS Test Data 28.7 Incidence December 2010

6 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Aquarius Data 28.7 Incidence August 2011

7 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation SMOS Test Data 38.7 & 45.6

8 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Inter-calibration Next Steps Wait for SMOS L1 reprocessing to correct biases Focus on SMOS Alias-Free FOV; exclude Extended Alias-Free Regenerate a similar SMOS ascending pass across Pacific Match with Aquarius passes +/- three days Before end of this year Other cooperative analyses (M.Martin-Neira) RFI: Compare antenna gain patterns RFI filter algorithm Near-shore land biases; particularly Chilean coast

9 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation “First Release” Image Credit: Aquarius Instrument Cal/Val Working Group and Algorithm Development Team

10 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation First 7-day image after re-calibration

11 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation First Orbit Tv; 20 Aug 2011

12 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Buoy Matchups Aug Early Calibration Biases; all negative

13 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation F.Wentz image, 30 Aug 2011 Aquarius Salinity Top Reference Salinity Bottom Four Changes for V1.1 Processing 1.Noise Diode Temperatures 2.APC 3.Wind-Induced Emissivity Model 4.Coefficient to Salinity Retrieval Algorithm

14 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Slightly Revised Wind Model New Tb wind model function based on 1-hour collocations with F17 wind speed for August 21- Sept 5, 2011 (F.Wentz) Black = V-pol Red = H-pol Solid line is new model. Dashed line is Yueh PALS model. Almost no Polarization difference for Beam 1 Near-linear for all 3 beams Beam 1, 28.7 o Beam 2, 37.8 o Beam 3, 45.6 o

15 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Post Re-calibration Buoy Match-ups Outliers in high latitudes, especially near Antarctic ice edge

16 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Calibration Drift vs Buoys Trend of delta salinity (radiometer – in situ) 08/25-09/19 (global)

17 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Next Iteration (V1.2) Introduce time-dependent bias correction Convert from NCEP wind to scatterometer for roughness correction Probably some other minor adjustments

18 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation

19 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation

20 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation

21 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Scatterometer Receiver RFI

22 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation

23 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation

24 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Arctic Tb, 1-7 September 2011

25 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation Meetings Nov: Aquarius Cal/Val Working Group, JPL 5-9 Dec: Fall AGU Special Session, San Francisco Feb 2012: Ocean Sciences, Salt Lake City Abstract Deadline 7 October March 2012: MicroRad, Rome Abstract Deadline 9 October April 2012: Aquarius/SAC-D Science Team Meeting, Buenos Aires

26 of September 2011 SMOS Science Meeting, Arles Aquarius Simulation