smos l2 ocean salinity level 2 ocean salinity l2os planning 2 july 2014 argans & smos l2os esl...

SMOS L2 Ocean Salinity

www.argans.co.uk

Level 2 Ocean Salinity

L2OS planning

2 July 2014

ARGANS & SMOS L2OS ESL

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L2OS evolution for metrics: AUX_DTBXY

• To support L1 & L2OS metrics, AUX_DTBXY needs extending to include snapshot statistics for L1c TBs, forward model TBs, and OTT correction TBs: for all polarisations, all 12 FOV sub-zones, & all 3 forward models.

• To support A3TEC metrics, AUX_DTBXY needs extending to include retrieved TEC and associated data.

• No changes to algorithm, configuration, or science products = low risk.

• AUX_DTBXY to increase in size from max ~10Mb to ~13Mb

• We recommend L2OS v620 is delivered September 2014 and used for reprocessing, to generate AUX_DTBXY as a reference data set for L1 & L2OS metrics, and A3TEC analysis.

• Summer 2014 delivery (late – due April) will be L1 Metrics Plan (including ADD) based on draft TRUM (Tools Release User Manual) & PPSR.

• L2OS v620 delivered September 2014 with Tools for L1 Metrics2


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L2OS evolution for metrics: AUX_DTBXY

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n x geographical regions:region ID, snap start/stop time/ID3 x forward models

8 x polarisationsott statsdeltaTB[xi,eta]std(deltaTB)[xi,eta]count(deltaTB)[xi,eta]flags[xi,eta]

for each snapshot in region:ID, lat/longpolarisation flagsdeltaTB (0.3 circle)

V612 v620n x geographical regions:

region ID, snap start/stop time/ID3 x forward models

8 x polarisationsott statsdeltaTB[xi,eta]std(deltaTB)[xi,eta]count(deltaTB)[xi,eta]flags[xi,eta]

for each snapshot in region:ID, lat/longpolarisation flagsfor 12 FOV sub-zones

for 3 polarisationsL1cTBfor 3 forward models

forward model TBOTT TBdeltaTBmeasurement count

A3TEC statsfov/geo lat/long, lat TECTEC from L1c & A3, sigma

Max snapshots in global region ~1500, in OTT region ~500

Metrics adds < ~3Mb

A3TEC adds < ~90Kb


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L2OS tuning for reprocessing

Reference L2OS data sets:

• v620 ref (from ESAC rehearsal) – un-tuned configuration:L1c v620 & L2OS v612 (20110423-20110607 & 20121104 – 20130205)

• v620 run2 (ARGANS) – first tuned configuration:L1c v620 & L2OS v613 (20110423-20110607 & 20121104 – 20130205)

•L1c v620 configuration update changes border width, RFI thresholds•ESL work shows need to revisit L2OS thresholds & filtering, and not to use sun tails flag to filter measurements

•Reprocessing L2 starts September/October 2014?, end Jan/Feb 2015, followed by L1 & L2 catch-up reprocessing of 2014 data => end April/May 2015?

•Process L1c (ESAC) May 2011 (ARGANS) in August with revised thresholds

•New thresholds delivered September 2014 for L2 reprocessing

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L2OS forward model sensitivity analysis – flat sea model

Flat sea SST sensitivity: SST298 minus SST278

Sensitivity to SST is low in XX, but up to 0.1K/degree in YY at high incidence angles

Flat sea SSS sensitivity: SSS37 minus SSS33

~0.6K/psu at low incidence angles~0.9K/psu at high incidence angles


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L2OS forward model sensitivity analysis – wind speed

General bias between roughness models of ~±0.5K at 7m/s

Model updates 2010-2011: more SMOS data now => better models

M1 XX

M2 XX

M3 XX

M1 YY

M2 YY

M3 YY


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L2OS forward model sensitivity analysis

Worse case (eg high incidence angle) model sensitivities

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Flat sea Roughness model 1

Roughness model 2

Roughness model 3

Galactic noise

SSS (K / psu) 0.9 0.01 XX0.03 YY

0 0 0

SST (K / degree) 0.02 XX0.1 YY

0.005 0 0 0

WS (K / m/s) 0 0.4 XX0.2 YY

0.4 XX0.15 YY

0.4 XX0.2 YY

< 0.05

Wind direction (@ 7 m/s) 0 ±0.1 XX±0.15 YY

0 0 0

BT (K) SSS (psu)

Flat sea 0.75 1.5

Roughness model 1

Roughness model 2

Roughness model 3 @ SST 17°C, WS 7m/s ±2 ±4

Galactic noise

Worse case (eg high incidence angle) model absolute error estimates


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L2OS evolution

Major improvements in L2OS performance from v550 to v612 from:• correction of L1 long term drift (daily OTT)• new galactic scattering model• TEC retrieval in descending orbits => better Faraday rotation• multi-threading

Work-plan for 2014-2017 identifies tasks for further improvements:• minimize flaws in L1 over ocean (biases & flagging)• refine forward models• improve filtering retrieval methods• improve quality assessment & user experience

ESL already working on these tasks with promising results (land-sea, filtering) – we expect major improvements in quality of ocean products during next phase.

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L2OS follow-on ESL contract: work-plan overview

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WP Task Priority Difficulty Objective Lead CommentsMinimize flaws in L1 over oceanWP1.1 Land-sea 1 1 Empirical correction L1c TBs NR/JTWP1.2 OTT strategy 2 2 Matrix OTT/bias correction JLVWP1.3 Filtering 1 1 Improved RFI/sun flagging JLVRefine forward modelsWP2.1 Dielectric 1 1 Evolve dielectric model ? 1psuWP2.2 Roughness 1 2 Evolve models & geophysical dependencies NR SSS 1-14m/sWP2.3 Glint 2 2 Evolve GO model JT ≤1psuWP2.4 Aux data 3 2 Assess impact of geophysical aux data ?WP2.5 Rain 3 1 Identify surface & atmospheric impact XY/JBImprove retrieval methodsWP3.1 Inversion QC 1 3 Evolve OS quality metrics EOWP3.2 Retrieval algorithm 2 2 Stokes 1, 2-step, Monte-Carlo? XY/EOWP3.3 TEC 1 3 Evolve Stokes 3 TEC JLV New productImprove quality assessment & user experienceWP4.1 Validation 1 2 Improved validation tools EO Non-ESL taskWP4.2 Match-up DB 1 2 Match-up DB spec NR Non-ESL taskWP4.3 netCDF 2 3 Fool-proof products MAManagementWP5.1 Planning & delivery 1 2 Planning, documentation, processor delivery PSWP5.2 Coordination 1 2 Teleconf, PMs, QWG, SPCM, web, publications PS


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L2OS follow-on ESL contract: processor delivery schedule

L2OS v630 spring 2015:• land-sea correction (WP1.1)• improved QC (WP3.1), filtering (WP1.3)• update of roughness/foam model 1 (WP 2.2)• could be use to re-reprocess L1 v620?

L2OS v640 spring 2016:• use of new constraints on roughness models (WP2.2)• better flat sea model (WP2.1)• improved GO galactic glint model (WP2.3)• new TEC product (WP3.3)• netCDF (WP4.3)

L2OS v630 spring 2017:• improved (adaptive?) retrieval algorithm(s) (WP3.2)• using new/alternative geophysical inputs (WP2.4)• mitigation of rain impact (WP2.5)• better OTT strategy (WP1.2)• comprehensive validation (WP4.1)

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L2OS follow-on ESL contract: resources (months)

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WP Task P D2015 2016 2017 2015 2016 2017 2015 2016 2017 2015 2016 2017 2015 2016 2017 2015 2016 2017

WP1.1 Land-sea 1 1 1 0.5 0.25 0.38 0.25 0.25 1.56 1.56 0.94 0.15 0.15 0.15 5.73 5.23 5.23 NR/JB/NMWP1.2 OTT strategy 2 2 0 0 1 0.13 0.13 0.13 0 1 0.5 0.4 0.4 0.4 JBWP1.3 Filtering 1 1 1.5 0.5 0.5 1.51 1.51 1.51 1.75 0.5 0.5 0.4 0.4 0.4 JBWP2.1 Dielectric 1 1 0 0.1 0.2 0.31 0.63 1.56 0.88 1.05 3.38 ?WP2.2 Roughness 1 2 0.25 0.5 0.25 2.01 0.5 0.5 2 2 2 2.9 2.9 1.9 JBWP2.3 Glint 2 2 0.25 0.2 0.15 1.56 1.25 0.94 3.63 3 2.38 NRWP2.4 Aux data 3 2 0.25 0.5 0.5 1 2 1 ?WP2.5 Rain 3 1 0 0 0.25 0.13 1.25 1 0.4 0.4 0.4 JBWP3.1 Inversion QC 2 3 1.1 0.4 0.35 3.15 3.15 3.15 0.6 0.6 0.6 BECWP3.2 Retrieval alg 2 2 0.75 1 1.25 1.88 2.01 2.51 3 3 3 0.5 1 1 1 1 1 JB/BECWP3.3 TEC 2 3 0.5 1.5 0.75 1.01 1.51 1.26 1.25 0.75 0.75 0.4 0.4 0.4 JBWP4.1 Validation 1 2 4.6 4.6 4.6 JB/NM/BECWP4.2 Match-up DB 1 2 3.1 2.1 2.1 NR/JB/NMWP4.3 netCDF 2 3 0.1 0.5 0.25 0.1 0.1 0.1WP5.1 Plan & deliver 1 2 0.5 0.5 0.5WP5.2 Coordination 1 2 0.5 0.5 0.5 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.5 0.5 0.5 NR

Total person-months 6.7 6.7 6.7 7.28 7.4 7.4 8.4 8.4 8.4 3.69 3.69 3.69 3.9 3.65 3.15 25.6 24.7 24.4

LOCEAN BEC Ifremer/ODL ACRI-st non-ESL

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ARGANS

smos l2 ocean salinity level 2 ocean salinity l2os planning 2 july 2014 argans & smos l2os esl...

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