1. www.argans.co.uk SMOS L2 Ocean Salinity Level 2 Ocean Salinity 21-22 February, 2011 ARGANS & L2OS ESL Tools for monitoring time drifts in SMOS L2OS parameters over selected ocean regions

2. www.argans.co.uk SMOS L2 Ocean Salinity Aim – to create a tool (set of scripts) for monitoring SMOS data for pre-defined regions of interest, in particular – to observe time drifts, seasonal variations of the parameters; at first stages – maybe to help identifying L1 and instrumental problems causing drift in L2OS parameters. The results are supposed to be derived from SMOS UDP/DAP product, processed automatically, in real time (as the products appear) or post-processed; The results should be ultimately suitable for web access, similar to current ARGANS web interface to DPGS processed SMOS DAP products.

3. www.argans.co.uk SMOS L2 Ocean Salinity Regions of Interest SouthernPacific; NorthAtlantic; TropicalPacificSW; SouthOfTasmania; EquatorialOcean; TarfayaModelregion; AmazonPlume; GulfOfBiscay; MediterranianSea; SouthernOcean; IntertropicalPacific; Spanish-IEO_Mooring;

4. www.argans.co.uk SMOS L2 Ocean Salinity Model_1 retrieving WSn instead of UN10 and VN10 Contents

5. www.argans.co.uk SMOS L2 Ocean Salinity List of geophysical parameters to monitor Roughness 1: SSS, Sigma_SSS, SST, Sigma_SST, UN10, Sigma_UN10, VN10, Sigma_VN10, TEC, Sigma_TEC; Roughness 2: SSS, Sigma_SSS, SST, Sigma_SST, TEC, Sigma_TEC, Uwav ( L20S_3.16 and lower ), Sigma_Uwav ( L20S_3.16 and lower ), WSn ( L20S_3.17 and higher ), Sigma_WSn ( L20S_3.17 and higher ), omega, Sigma_omega, phi_wsn, Sigma_phi_wsn; Roughness 3: SSS, Sigma_SSS, TEC, Sigma_TEC, WSn, Sigma_WSn, HS, Sigma_HS, phi_wsn (L20S_3.17 and higher), Sigma_phi_wsn (L20S_3.17 and higher); Cardioid: Acard, Sigma_Acard, SST, Sigma_SST;

6. www.argans.co.uk SMOS L2 Ocean Salinity Statistical output Min; Max; Mean; Median; Stdev; Kurtosis; Skew;

7. www.argans.co.uk SMOS L2 Ocean Salinity Selection algorithm For each day in specified range (say, from 15/07/2010 to 31/12/2010) -identify list of orbits within +/- n days, say n=3; -exclude from the list the orbits with wrong asc/desc and full/dual pol; -exclude orbits not having a point(s) in pre-defined Lat/Lon box For each half-orbit from the list reduced according to the algorithm above -read UDP and DAP products; -exclude -999 marked points; -exclude points at the X-swath edges (say beyond +/-300 km band); -exclude points not satisfying defined UDP flag filters; For all the points selected above, calculate statistics listed on the previous page, for each field on the page 6, plot histogram and store statistics in a file corresponding the central day of this 2*n sampling; Combine statistics for each day into time line curves;

8. www.argans.co.uk SMOS L2 Ocean Salinity Output of the exercise N folders (corresponding to N days of observation) containing set of histograms (examples on the next page) suitable for animation to watch day-by-day changes in long-term trends for specified parameters; N folders (corresponding to N days of observation) containing set of text files with individual statistics for the time period centred around the day of observation Set of time curves with dates for X-axis and one of the statistic characteristics – for Y-axis, say, mean, median, kurtosis etc. Mean and median curves are supplied by errorbars corresponding to stdev values; separate curves are produced for (a) not filtered GP sets, (b) filtered by Xswath location and (c) filtered by UDP quality flags; Kurtosis and Skew curves are plotted without errorbars but combined into triplets non- filtered/Xswath-filtered/UDP-filtered;

9. www.argans.co.uk SMOS L2 Ocean Salinity Examples

10. www.argans.co.uk SMOS L2 Ocean Salinity Examples of histograms

11. www.argans.co.uk SMOS L2 Ocean Salinity S/Pacif asc orbs 2010_10_21 3 days,148102,66213,-30.0,0.0,-150.0,-120.0,SSS,2 min, max, mean, median, std, skew, kurtosis 34.041, 39.22, 36.584, 36.572, 0.6754, 0.07864, -0.18186 # in-box, filtered, x-swath selected ######################## --STATISTICS EXTRA-- ################################################ 33.705, 39.22, 36.588, 36.575, 0.6749, 0.07184, -0.17542 # in-box, NO filt, x-swath select 28.934, 43.546, 36.605, 36.585, 1.02, 0.042553, 2.4468 # in-box, NO filt, NO x-swath sel ### Total number of processed GP's in selected orbits: 1657202 ### Number of GP's after removing '-999': 1057173 ### Number of GP's in the box (no filters): 148102 ### Number of GP's in the box, selected over x-swath: 75810 ### Number of GP's in the box, filtered: 66213 # $BOX COORDINATES$ # ###### South: -30.000000 ###### North: 0.000000 ###### West: -150.000000 ###### East: -120.000000 # $OUTPUT$ # ###### Field: SSS ###### Roughness Model: 2 ###### Anomaly: NO # $X-swath FILTER$ 300.000000 km # # $UDP FILTERS$ # -Fg_ctrl_sigma = 0 -Fg_ctrl_chi2 = 0 -Fg_ctrl_chi2_P = 0 -Fg_ctrl_marq = 0 -Fg_ctrl_valid = 1 -Fg_ctrl_reach_maxiter = 0 # $ORBITS$ # /mnt/satabeast3/smos/data/2010/10/18/SM_OPER_MIR_OSDAP2_20101018T140029_20101018T145431_316_001_1, A /mnt/satabeast3/smos/data/2010/10/18/SM_OPER_MIR_OSDAP2_20101018T154034_20101018T163433_316_001_1, A /mnt/satabeast3/smos/data/2010/10/22/SM_OPER_MIR_OSDAP2_20101022T162504_20101022T171858_316_001_1, A /mnt/satabeast3/smos/data/2010/10/22/SM_OPER_MIR_OSDAP2_20101022T144455_20101022T153854_316_001_1, A /mnt/satabeast3/smos/data/2010/10/20/SM_OPER_MIR_OSDAP2_20101020T160246_20101020T165647_316_001_1, A /mnt/satabeast3/smos/data/2010/10/20/SM_OPER_MIR_OSDAP2_20101020T142241_20101020T151642_316_001_1, A /mnt/satabeast3/smos/data/2010/10/19/SM_OPER_MIR_OSDAP2_20101019T132133_20101019T141534_316_001_1, A /mnt/satabeast3/smos/data/2010/10/19/SM_OPER_MIR_OSDAP2_20101019T150137_20101019T155539_316_001_1, A /mnt/satabeast3/smos/data/2010/10/21/SM_OPER_MIR_OSDAP2_20101021T152349_20101021T161750_316_001_1, A /mnt/satabeast3/smos/data/2010/10/21/SM_OPER_MIR_OSDAP2_20101021T134346_20101021T143745_316_001_1, A /mnt/satabeast3/smos/data/2010/10/23/SM_OPER_MIR_OSDAP2_20101023T140558_20101023T145957_316_001_1, A /mnt/satabeast3/smos/data/2010/10/23/SM_OPER_MIR_OSDAP2_20101023T154603_20101023T164002_316_001_1, A Example of stat file

12. www.argans.co.uk SMOS L2 Ocean Salinity Examples of timelines, different types of filtering

13. www.argans.co.uk SMOS L2 Ocean Salinity Sub-areas of SouthernPacific 30S - 0 20S – 10S 25S – 20S

14. www.argans.co.uk SMOS L2 Ocean Salinity Examples of timelines

15. www.argans.co.uk SMOS L2 Ocean Salinity Examples of timelines m/s

16. www.argans.co.uk SMOS L2 Ocean Salinity Summary We have selected a way and prepare a set of tools/scripts for statistical monitoring of retrieved SMOS parameters for selected Ocean areas; We are trying to identify and test proper statistical characteristics (mean/median/kurtosis etc); We are working on optimal filtering criteria; one preliminary conclusion – from statistical point of view, Xswath filtering does most of the job, comparing to other types of filtering;