SMOS L2 Ocean Salinity www.argans.co.uk Level 2 Ocean Salinity L1 -> L2OS tools 12 February 2014 ARGANS & SMOS L2OS ESL.

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SMOS L2 Ocean Salinity Level 2 Ocean Salinity L1 -> L2OS tools 12 February 2014 ARGANS & SMOS L2OS ESL

SMOS L2 Ocean Salinity L1 -> L2OS tools L1 performance characteristic Long term drift/bias Land/sea contamination Latitude bias/short term drift Spatial bias TB absolute accuracy Sun correction Sun tail flagging/correction RFI detection/mitigation Ascending/descending delta Full polarimetry SSS quality Parameter – product parameter tested Maturity – is the test tool available? Time – estimated time to run Run by – ESL/ESAC/IDEAS/SPQC – TBD Impact – on L1 quality/metrics CharacteristicTestParameterMaturityTimeRun byImpact Long term drift/bias2.1. Stokes 1 bias using forward model 2 (CLS)L1b TBsReady ESACHigh

SMOS L2 Ocean Salinity L1 -> L2OS tools: part 1 CharacteristicTestParameterMaturityTimeRun byImpact Long term drift/bias 2.1. Stokes 1 bias using forward model 2 (CLS) L1b TBsReady ESACHigh Long term drift/bias 2.2. Impact of sun on NIR antenna temperature & flagging (Ifremer/CLS) TBDNot yet available Long term drift/bias 2.3. Snapshot mean deltaTB from AUX_DTBXY_ (ARGANS) L1c TBsHigh4 days per year for OTT regions ESAC/SPQCHigh Long term drift/bias 2.4. OTT deltaTB statistics from AUX_DTBCUR (ARGANS) L1c TBsHigh5 days per year for OTT regions ESAC/SPQCHigh Land/sea contamination 3.1. Global Stokes 1 plots (Ifremer/CLS)L1b TBsReady ESACHigh Land/sea contamination day sub-cycle full pol monitoring (Ifremer/CLS) TBDNot yet available Land/sea contamination 3.3. Ghost detection (ACRI-ST)L1 browseReady 4 monthsACRI-STMedium Latitude bias/short term drift 4.1. Hovmoller plots of Stokes 1 in AFFOV using forward model 2 (Ifremer/CLS) L1c TBsReady ESACHigh Latitude bias/short term drift 4.2. Hovmoller plots of snapshot mean deltaTB from AUX_DTBXY_ (ARGANS) L1c TBsHigh4 days per year for OTT regions ESAC/SPQCHigh Latitude bias/short term drift 4.3 Latitudinal plots of delta(SSS – ISAS) (LOCEAN) L2OS SSSHighfastLOCEANMedium Spatial bias 5.1. OTT analysis (ARGANS)L1c TBsHighfastESACHigh TB absolute accuracy6.1. Compare Stokes 1 with forward model TBs (Ifremer/CLS) L1b TBsHigh ESACHigh TB absolute accuracy6.2. Global plots of per snapshot mean deltaTBs from DTBXY (ARGANS) L1c TBsHigh5 days per month ESACMedium

SMOS L2 Ocean Salinity CharacteristicTestParameterMaturityTimeRun byImpact Sun correction 7.1. OTT anomaly plots (LOCEAN)L1c TBs LOCEANHigh Sun tail flagging/correction 8.1. OTT std(deltaTB)/ra plots (LOCEAN) L1c TBs LOCEANHigh RFI detection/mitigation 9.1. OTT std(deltaTB)/ra plots (LOCEAN/ARGANS) L1c TBsHighfast per orbitESACLow RFI detection/mitigation 9.2. RFI probability monthly maps (Ifremer/CLS) L3 CATDS TBs Not yet available Ifremer/CLS RFI detection/mitigation 9.3 Compare L1 & L2OS RFI flagging (LOCEAN/ARGANS/ACRI-ST) L1c & L2OS flags Readyfast per orbitESACHigh Ascending/descending delta Hovmoller plots & global maps (Ifremer/CLS) L1b TBsReady ESACHigh Ascending/descending delta 10.2 Global L3 SSS maps (LOCEAN/CLS/BEC) LOCEAN, CLS, BEC Medium Full polarimetry Global average maps of Stokes 3 & 4 (Ifremer/CLS) L1b TBsNot yet available Full polarimetry Polarisation mixing (ACRI-ST)L1c TBsReady 4 monthsACRI-STMedium SSS quality (regional assessment) 12.1 Global monthly SSS anomaly maps (LOCEAN) L2OS SSSReadyfast from monthly maps LOCEANHigh SSS quality (quantification of performance) 12.2 Collocations with ARGO (LOCEAN) L2OS SSS colocated with ARGO SSS Ready time consuming LOCEANHigh SSS quality12.3 Global L3 SSS anomaly maps (BEC) L3 BEC SSS BECHigh L1 -> L2OS tools: part 2

SMOS L2 Ocean Salinity L1 -> L2OS tools: long term drift/bias 2.1 Stokes 1 bias using forward model 2 (CLS) 92+ Pacific orbit model 2 TBs from CLS compare with L1b TBs Plot bias in (Tx+Ty)/2 in AF & EAF for ascending & descending orbits 2.3. Snapshot mean deltaTB from AUX_DTBXY (ARGANS) Extracts mean deltaTB (= L1c – model 1 TBs) per snapshot in 0.3 radius xi/eta circle Plot deltaTB for any region, per polarisation 2.4. OTT deltaTB statistics from AUX_DTBCUR (ARGANS) Extracts OTT region deltaTB statistics (median & std) for FOV sub-regions Plot deltaTB per polarisation, per FOV sub-region

SMOS L2 Ocean Salinity L1 -> L2OS tools: land-sea contamination 3.1. Global Stokes 1 plots (Ifremer/CLS – same as 6.1) Global plots of JRECON minus (Tx+Ty)/2 L1c TB Global plots of delta between (JRECON – L1b) for different L1 configurations/versions 3.3. Ghost detection (ACRI-ST) Monthly TB map from 42.5° TB at 3 FOV positions. All polarizations.

SMOS L2 Ocean Salinity L1 -> L2OS tools: latitude bias/short term drift 4.1. Hovmoller plots of Stokes 1 in AFFOV using forward model 2 (Ifremer/CLS) South Pacific orbits; Hovmoller plots of (Tx+Ty)/2 L1c TB minus JRECON 4.2. Hovmoller plots of snapshot mean deltaTB from AUX_DTBXY_ (ARGANS) Hovmoller plots per polarisation (or Stokes1) for any region of binned mean deltaTB (= L1c – model 1 TBs) per snapshot in 0.3 radius xi/eta circle 4.3. Latitudinal plots of delta(SSS – ISAS) (LOCEAN) Compare good quality retrieved SSS with ISAS for similar orbits (eastern Pacific or other) Bias patterns can be due to L1 or L2OS forward model

SMOS L2 Ocean Salinity L1 -> L2OS tools: spatial bias 5.1. OTT analysis (ARGANS) Plots, statistics and histograms of OTT deltaTB for all polarisations in AF/EAF/FOV sub-regions, for single orbits (AUX_DTBXY_, any geographical region) and multiple orbits (AUX_DTBCUR, OTT regions only). Ascending OTT median & std deltaTB for FOV sub-regions (AUX_DTBCUR, 10 May 2011) v505v611_300v505v611_300

SMOS L2 Ocean Salinity L1 -> L2OS tools: TB absolute accuracy 6.1. Compare Stokes 1 with forward model TBs (Ifremer/CLS – same as 3.1) Global plots of JRECON minus (Tx+Ty)/2 L1c TB Global plots of delta between (JRECON – L1b) for different L1 configurations/versions 6.2. Global plots of per snapshot mean deltaTBs from AUX_DTBXY_ (ARGANS) Global plots of any polarisation or Stokes 1 of binned per snapshot mean deltaTBs in a xi/eta 0.3 circle

SMOS L2 Ocean Salinity L1 -> L2OS tools: sun & sun tails 7.1. OTT anomaly plots (LOCEAN) Plots of anomalies (vertical & diagonal stripes) between reference and extracted OTTs 8.1. OTT std(deltaTB)/ra plots (LOCEAN) Plots of ratios of std(deltaTB) to radiometric accuracy: high values indicate sun tail flagging/correction problems

SMOS L2 Ocean Salinity L1 -> L2OS tools: RFI 9.1. OTT std(deltaTB)/ra plots (LOCEAN/ARGANS) Plots of std(deltaTB)/ra for one or more orbits Data extracted using breakpoints/ L2OS debug version 9.3. Compare L1 & L2OS RFI flagging (LOCEAN/ARGANS/ACRI-ST) Snapshot data extracted using compareTBs, flags/TBs plotted per snapshot -> statistical analysis, animations, visual inspection…

SMOS L2 Ocean Salinity L1 -> L2OS tools: ascending/descending delta Hovmoller plots (Pacific) & global maps (Ifremer/CLS – same as 3.1/6.1/7.1) Hovmoller & global plots of Stokes 1 descending minus ascending 10.2 Global L3 SSS maps (LOCEAN/CLS/BEC) Global plots of L3 SSS ascending minus descending

SMOS L2 Ocean Salinity L1 -> L2OS tools: Full polarimetry Globally averaged maps of T3 and T4 (Ifremer/CLS) – not yet available -Monitoring of Sea ice/ocean and land/ocean edges -Monitoring of high TEC regions -Monitoring of storms signatures Polarisation mixing (ACRI-ST). Monthly maps of T3/(TX-TY) and T4/T3 at 42.5° and 3 FOV positions.

SMOS L2 Ocean Salinity L1 -> L2OS tools: SSS quality 12.3 Global L3 SSS anomaly maps (BEC) Global plots of L3 SSS anomaly 12.1 Global monthly SSS anomaly maps (LOCEAN) SSS SMOS minus SSS ISAS (2D smoothed ARGO), shows systematic biases eg land and ice contamination Collocations with ARGO (LOCEAN) Quantitative comparisons of SSS with collocated ARGO => SSS quality (bias, std_difference, r) at global and regional scale

SMOS L2 Ocean Salinity CharacteristicTestParameterMaturityTimeRun byImpactDeliver? Long term drift/bias2.1. Stokes 1 bias using forward model 2 (CLS) L1b TBsReady ESACHighDone Long term drift/bias2.2. Impact of sun on NIR antenna temperature & flagging (Ifremer/CLS) TBDNot yet available Later Long term drift/bias2.3. Snapshot mean deltaTB from AUX_DTBXY_ (ARGANS) L1c TBsHigh4 days per year for OTT regions ESAC/SPQCHighSummer Long term drift/bias2.4. OTT deltaTB statistics from AUX_DTBCUR (ARGANS) L1c TBsHigh5 days per year for OTT regions ESAC/SPQCHighSummer Land/sea contamination 3.1. Global Stokes 1 plots (Ifremer/CLS)L1b TBsReady ESACHighDone Land/sea contamination day sub-cycle full pol monitoring (Ifremer/CLS) TBDNot yet available Later Land/sea contamination 3.3. Ghost detection (ACRI-ST) L1 browseReady 4 monthsACRI-STMedium Latitude bias/short term drift 4.1. Hovmoller plots of Stokes 1 in AFFOV using forward model 2 (Ifremer/CLS) L1c TBsReady ESACHighDone Latitude bias/short term drift 4.2. Hovmoller plots of snapshot mean deltaTB from AUX_DTBXY_ (ARGANS) L1c TBsHigh4 days per year for OTT regions ESAC/SPQCHighSummer Latitude bias/short term drift 4.3 Latitudinal plots of delta(SSS – ISAS) (LOCEAN) L2OS SSSHighfastLOCEANMedium Spatial bias5.1. OTT analysis (ARGANS)L1c TBsHighfastESACHighSummer TB absolute accuracy6.1. Compare Stokes 1 with forward model TBs (Ifremer/CLS) L1b TBsHigh ESACHighDone TB absolute accuracy6.2. Global plots of per snapshot mean deltaTBs from DTBXY (ARGANS) L1c TBsHigh5 days per month ESACMediumSummer

SMOS L2 Ocean Salinity CharacteristicTestParameterMaturityTimeRun byImpactDeliver? Sun correction7.1. OTT anomaly plots (LOCEAN)L1c TBs LOCEANHigh Sun tail flagging/correction 8.1. OTT std(deltaTB)/ra plots (LOCEAN) L1c TBs LOCEANHigh RFI detection/mitigation 9.1. OTT std(deltaTB)/ra plots (LOCEAN/ARGANS) L1c TBsHighfast per orbitESACLow RFI detection/mitigation 9.2. RFI probability monthly maps (Ifremer/CLS) L3 CATDS TBsNot yet available Ifremer/CLS Later RFI detection/mitigation 9.3 Compare L1 & L2OS RFI flagging (LOCEAN/ARGANS/ACRI-ST) L1c & L2OS flags Readyfast per orbitESACHigh Ascending/descending delta Hovmoller plots & global maps (Ifremer/CLS) L1b TBsReady ESACHighDone Ascending/descending delta 10.2 Global L3 SSS maps (LOCEAN/CLS/BEC) LOCEAN, CLS, BEC Medium Full polarimetry11.1. Global average maps of Stokes 3 & 4 (Ifremer/CLS) L1b TBsNot yet available Later Full polarimetry11.2. Polarisation mixing (ACRI-ST) L1c TBsReady 4 monthsACRI-STMediu m SSS quality (regional assessment) 12.1 Global monthly SSS anomaly maps (LOCEAN) L2OS SSSReadyfast from monthly maps LOCEANHigh SSS quality (quantification of performance) 12.2 Collocations with ARGO (LOCEAN) L2OS SSS colocated with ARGO SSS Ready time consuming LOCEANHigh SSS quality12.3 Global L3 SSS anomaly maps (BEC) L3 BEC SSS BECHigh