1 / 11

Evolution of L2OS Metrics for Enhanced Ocean Salinity Monitoring

This report outlines the planning and evolution of the Level 2 Ocean Salinity (L2OS) metrics as of July 2014. Key proposed changes include extending AUX_DTBXY to support additional snapshot statistics for L1 and L2OS metrics. The introduction of A3TEC metrics and enhancements to auxiliary data will be made to achieve more accurate ocean salinity measurements. The transition to version 620 of L2OS is earmarked for delivery in September 2014, ensuring continuity in performance and paves the way for comprehensive reprocessing of 2014 data, with a focus on improving model accuracy and data quality.

nevan
Télécharger la présentation

Evolution of L2OS Metrics for Enhanced Ocean Salinity Monitoring

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Level 2 Ocean Salinity L2OS planning 2 July 2014 ARGANS & SMOS L2OS ESL

  2. 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 Metrics

  3. L2OS evolution for metrics: AUX_DTBXY V612 v620 n x geographical regions: region ID, snap start/stop time/ID 3 x forward models 8 x polarisations ott stats deltaTB[xi,eta] std(deltaTB)[xi,eta] count(deltaTB)[xi,eta] flags[xi,eta] for each snapshot in region: ID, lat/long polarisation flags for 12 FOV sub-zones for 3 polarisations L1cTB for 3 forward models forward model TB OTT TB deltaTB measurement count A3TEC stats fov/geo lat/long, lat TEC TEC from L1c & A3, sigma n x geographical regions: region ID, snap start/stop time/ID 3 x forward models 8 x polarisations ott stats deltaTB[xi,eta] std(deltaTB)[xi,eta] count(deltaTB)[xi,eta] flags[xi,eta] for each snapshot in region: ID, lat/long polarisation flags deltaTB (0.3 circle) Max snapshots in global region ~1500, in OTT region ~500 Metrics adds < ~3Mb A3TEC adds < ~90Kb

  4. 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

  5. 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

  6. L2OS forward model sensitivity analysis – wind speed • M1 XX • M2 XX • M3 XX • M1 YY • M2 YY • M3 YY General bias between roughness models of ~±0.5K at 7m/s Model updates 2010-2011: more SMOS data now => better models

  7. L2OS forward model sensitivity analysis • Worse case (eg high incidence angle) model sensitivities • Worse case (eg high incidence angle) model absolute error estimates

  8. 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.

  9. L2OS follow-on ESL contract: work-plan overview

  10. 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)

  11. L2OS follow-on ESL contract: resources (months)

More Related