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SMOS L2 Ocean Salinity

Level 2 Ocean Salinity QWG #5

30 May – 1 June 2011

ARGANS & L2OS ESL

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SMOS L2 Ocean Salinity

L2OS DPGS status

8 March 20118 February 2011

8 March: new AFDs (OTTs & RGHNS3)8 February: new OTTs for changed configuration

26 May 2011

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SMOS L2 Ocean Salinity

• pre-FAT delivery 27 May, FAT 21-22 June

• What’s new in v500?– No longer setting Fm_valid to false when Fm_l1c_rfi flag is set– Fm_l1c_rfi = new L1c RFI tails flag (or’d with mitigation, strong, & point RFI flags)– Dg_L2_RFI replaces Dg_eaf_fov in UDP (L1c no longer contains Fm_eaf_fov)

• OSUDP2 minor schema change (requiring SDV/BEAM update)

– Removed Fg_ctrl_poor_geophysical from quality tests– Fixed SPH poor counter of successful retrieval

• see http://www.argans.co.uk/smos/L2OS/verification.php

– L2 RFI detection/mitigation: new AUX_CNFOSD/F thresholds & schema• RFI_std = 1.2, RFI_nsig = 3, Tg_num_RFI_max = 33%

– No longer setting Fm_L1c_sun when Fm_L1c_sun_tails flag is set– Other PRs fixed:

• Outlier detection now calculates median of differences as specified in ATBD• Name of the processor in log messages now conforms with ICD (includes L2OS version)• Corrected BULL_B orchestration

L2OS status

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SMOS L2 Ocean Salinity

• Sun point is marked with a 0.15 diameter circle in cosdir– ESL: agreed, circle with r = 0.075

• Width of suntails is fixed at 0.01 in cosdirESL: sun tail flag should be closer to 0.1 than 0.01,(but low impact on salinity)

L2OS: if Fml1c_sun_point or Fml1c_sun_glint_fov then Fm_l1c_sun= true, Fm_valid = false

• Width of border flag is 0.01 in cosdir• Width of belt and suspenders is 0.02 in cosdir

New/changed flags in v500

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SMOS L2 Ocean Salinity

L2OS & L1PP v500 – first look

L2OS v317 & L1OP 340 L2OS v500 & L1PP v500More retrievals in N. Pacific RFILess S. Pacific ice contamination

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SMOS L2 Ocean Salinity

L2OS & L1PP v500 – first look

L2OS v317 & L1OP 340 L2OS v500 & L1PP v500Smoother & wider cross-track quality – L1 flagging border, belt & braces?

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SMOS L2 Ocean Salinity

L2OS & L1PP v500 – first look

L2OS v317 & L1OP 340 L2OS v500 & L1PP v500L1 flagging border, belt & braces: Dg_border_fov

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SMOS L2 Ocean Salinity

OTTs – first lookOTT1 from same orbit(20100802T153815)

L1OP 340

L1PP v500

> +3K bias in HH(wrong NIR)

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SMOS L2 Ocean Salinity

L2OS & L1PP v500 RFI – first look

Dg_RFI_L1 Fm_L2_RFI Fg_ctrl_suspect_RFI

Dg_RFI_L1: % Fm_l1c_rfi (from all 4 L1c RFI flags) – in this case, only from Fm_RFI_Point

Fm_RFI_Point: set if measurement has been affected by point source RFI identified in the AUX_RFI list, or it has exceeded an RFI threshold, or is negative

Correlation between L1 & L2 RFI to be investigated

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SMOS L2 Ocean Salinity

L2OS v500 RFI detection/mitigation

RFI detection off RFI detection on RFI mitigated retrievalsL2OS v500 & L1OP 346 (from DPGS)

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SMOS L2 Ocean Salinity

L2OS v500 RFI detection/mitigation

RFI detection off RFI detection on RFI mitigated retrievalsL2OS v500 & L1OP 346 (from DPGS)

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SMOS L2 Ocean Salinity

L2OS v500 RFI detection/mitigation

RFI detection off RFI detection on RFI mitigated retrievalsL2OS v500 & L1OP 346 (from DPGS)

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SMOS L2 Ocean Salinity

Product Performance• Once new L1 500 and L2OS 500 are implemented in DPGS, check:

– Ascending/descending differences– Land contamination– L1/L2 RFI detection/mitigation– Impact of sun and galactic signals– Performance of new roughness models (RGHNS1 received 26/05/2011)– Comparison of SMOS to Argo and climatology (SSS, WS)

• Timetable?– L1OP & L2OS -> DPGS July 2011?– Analysis of August 2011 L2OS products– QWG#6 September 2011– Go-ahead for reprocessing?

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SMOS L2 Ocean Salinity

Product Performance

± 0.5 psu

South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

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SMOS L2 Ocean Salinity

Ascending orbits only: ± 0.5 psu

South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

Product Performance

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SMOS L2 Ocean Salinity

Descending orbits only: ± 0.3 psu

South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

Product Performance

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SMOS L2 Ocean Salinity

SM_OPER_MIR_OSDAP2_20110502T010038_20110502T015440_317_001_1wind/fronts/wave age/ecmwf...

Issue: discontinuities?

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SMOS L2 Ocean Salinity

Ascending orbits: TEC prior & post:

South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

Product Performance: TEC

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SMOS L2 Ocean Salinity

Descending orbits: TEC prior & post:

South Pacific (15°S -25°S; 120°W- 130°W): mean values for retrieved SSS anomalies, filtered

Product Performance: TEC

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SMOS L2 Ocean Salinity

• Long-term OTT drift observed in reprocessed constant calibration L1b/c• & in new antenna model (see next slide)

• OTT & DPGS– Update when FTT updated

• OTT & reprocessing– Dependency on FTT updates (6 monthly)– Long cal (8 weeks)– NIR updates (15 days)– Mechanism: L1c & cod– Who?

• OTT generation & LO sync– TBD

OTT issues

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SMOS L2 Ocean Salinity

Jun-Dec 2010: ascending AFFOV = -0.7 K/year (std 0.2), EAFFOV = -0.3 K/year (std 0.2)Jun-Dec 2010: descending AFFOV = -1.8 K/year (std 0.4), EAFFOV = -1.2 K/year (std 0.3)

New Antenna model OTT referenced to June 2010

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SMOS L2 Ocean Salinity

Solar flare?

SM_OPER_MIR_OSDAP2_20110215T015901_20110215T025302_316_002_1

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SMOS L2 Ocean Salinity

L1c software error flag

20110302T062507 – 20110302T071906