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Request for SST Beta Maturity 23 February 2013, College Park, MD Request for SST Beta Maturity Sasha Ignatov – SST Lead John Stroup – SST Technical Liaison.

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Presentation on theme: "Request for SST Beta Maturity 23 February 2013, College Park, MD Request for SST Beta Maturity Sasha Ignatov – SST Lead John Stroup – SST Technical Liaison."— Presentation transcript:

1 Request for SST Beta Maturity 23 February 2013, College Park, MD Request for SST Beta Maturity Sasha Ignatov – SST Lead John Stroup – SST Technical Liaison Rosalie Marley – SST JAM STAR - Prasanjit Dash, Xingming Liang, Yury Kihai, Boris Petrenko, Marouan Bouali, Feng Xu U. Miami - Peter Minnett, Bob Evans, Kay Kilpatrick; NAVO - Doug May, Jean-Francois Cayula; NRL/USM - Bob Arnone, Walt McBride; EUMETSAT/Meteo France - Pierre Le Borgne, Herve Roquet NGAS - Sid Jackson; Raytheon - Bill Johnsen, Marian Hollingshead 23 February 2013SST EDR Beta1

2 Tracking DR # 7050 CCR # 474-CCR-13-0871 DRAT discussion: Feb 27, 2013 AERB presentation: Feb 27, 2013 23 February 2013SST EDR Beta2

3 JPSS Program – Mitch Goldberg, Kathryn Schontz, Bill Sjoberg NPP Project Scientist – Jim Gleason JPSS DPA – Heather Kilcoyne, Janna Feeley, Bonnie Reed, Bruce Gunther, and others VIIRS Sensor Data Records (SDR; L1b) Team – Changyong Cao, Frank DeLuccia, Mark Liu, and others VIIRS VCM Team – Andy Heidinger, Tom Kopp, Denis Botambekov NESDIS/STAR JPSS Team – Ivan Csiszar, Laurie Rokke, Lihang Zhou, and many others Acknowledgements 23 February 2013SST EDR Beta3

4 Outline SST Stakeholders, Community, NOAA Mission, Users Beta Maturity Definition SST EDR Summary –Inputs (SDRs & VCM), Algorithms & Product SST Requirements & DRs SST EDR Evaluation –VIIRS SST Imagery relative to MODIS –VIIRS Radiances (SDR): Stability/Consistency w/AVHRR/MODIS –EDR SST (VCM): Consistency w/ACSPO VIIRS/AVHRR/MODIS Summary and Recommendation –VIIRS Radiances are adequate for SST –Work underway with VCM Team to improve performance for SST Remaining Tasks Towards Provisional 23 February 2013SST EDR Beta4

5 Stakeholders  NWS (NCEP, CPC, OPC, JCSDA)  NESDIS (Coast Watch, Coral Reef Watch, NCDC, NODC, OSPO)  NMFS/NOS/OAR (Coast Watch)  DOD/Navy NOAA Mission Goals supported  Weather and Water  Climate  Ecosystem User’s Community  Climate  Weather  Oceanography  Operational Ocean Forecasting  Fisheries and Shipping  Academia Stakeholders, User Community, NOAA Mission 23 February 2013SST EDR Beta5

6 NCEP – Bob Grumbine, Avichal Mehra OPC, CPC – Joe Sienkiewicz NESDIS STAR Coast Watch – K. Hughes, Coral Reef Watch – M. Eakin, OSD NDE – T. Schott, OSPO – J. Sapper, NODC – K. Casey, NCDC – D. Reynolds/V. Banzon US Navy/FNMOC – Jim Cummings EUMETSAT – Simon Elliott Meteo France – Pierre Le Borgne, Herve Roquet Group for High Resolution SST – Peter Minnett UK Met Office – Matt Martin Japanese Met Agency – S. Ishizaki, D. Ichikawa Canadian Met Centre – Bruce Brasnett Bureau of Meteorology, Australia – Helen Beggs Sea and Atmosphere Inst., Lisboa, Portugal – A. Arriaga VIIRS SST Users 23 February 2013SST EDR Beta6

7 Early release product Minimally validated May still contain significant errors Versioning not established until a baseline is determined Available to allow users to gain familiarity with data formats and parameters Product is not appropriate as the basis for quantitative scientific publication studies and applications Beta Maturity Definition 23 February 2013SST EDR Beta7

8 Derived from SDRs in bands M12, M15, M16, and Geo Critically sensitive to accuracy and precision of SDRs Work closely with SDR Team to ensure adequate input Relies on external VIIRS Cloud Mask (VCM) and ice mask Critically sensitive to accuracy and precision of VCM Work closely with VCM Team to ensure adequate cloud/ice masks Retrieves 2 SSTs (skin, bulk) using regression algorithms New L1RD calls for one SST – skin; bulk is skin +0.17K IDPS regression formulations suboptimal, working to revisit SST EDR defines internal SST Quality Flags Current QFs found suboptimal/overly restrictive, working to revisit SST EDR Summary 23 February 2013SST EDR Beta8

9 SST (Skin) Requirements (new L1RD) EDR AttributeThresholdObjective a. Horizontal Cell Size (Res)1.6km 1 0.25km b. Mapping Uncertainty, 3σ2km 1 0.1km c. Measurement Range271 K to 313 K271 K to 318 K d. Measurement Accuracy 2 0.2K0.05K e. Measurement Precision 2 0.6K0.2K (<55° VZA) f. Refresh Rate12 hrs3 hrs g. Latency90 min15 min h. Geographic coverage Global cloud and ice-free ocean; excluding lakes and rivers Global cloud and ice-free ocean, plus large lakes and wide rivers 1 Worst case scenarios corresponding to swath edge; both numbers are ~1km at nadir 2 Represent global mean bias and standard deviation validation statistics against quality-controlled drifting buoys (for day and night, and in full VIIRS swath and range of atmospheric conditions). Uncertainty is defined as square root of accuracy squared plus precision squared. Better performance is expected against ship radiometers. 23 February 2013SST EDR Beta9

10 SST DRs DR numberShort Description 4696Fast-track SST EDR Tables 4727Update FT VIIRS SST regression coefficients table 4748 algorithm needs to check cloud mask quality 4789 Remove/replace bulk SST data 4790SST QFs code reorganization 4807Change forms of SST equations 4844SZA exclusion and SZA degradation flags affected by setting of cloudy/clear flags 4845OAD for SST does not agree with code in PCR31250 4846CDFCB vol IV part 3 SZA quality flag definition 4925Unsatisfactory VCM Performance for SST 4947SST to discontinue use of several ASFs 4948Add VCM snow/ice flag to SST EDR 49651st Guess Skin Temp Change to SST product 23 February 2013SST EDR Beta10

11 Gulf of Mexico 23 May 2012 – Night Examples ACSPO VIIRS and MODIS SST Imagery 23 February 2013SST EDR Beta11

12 ACSPO_V2.10_NPP_VIIRS_2012-05-23_0730-0740_20120526.053954.hdf NPP/VIIRS ACSPO SST 23 May 2012 0730-0740 UTC – Night – Swath Projection 23 February 2013SST EDR Beta12

13 ACSPO_V2.10_AQUA_MODIS_2012-05-23_0800-0805_20120527.093405.hdf Aqua/MODIS ACSPO SST 23 May 2012 0800-0805 UTC – Night – Swath Projection 23 February 2013SST EDR Beta13

14 NPP/VIIRS ACSPO SST 23 May 2012 0730-0740 UTC – Night – Mapped onto 0.8km grid ACSPO_V2.10_NPP_VIIRS_2012-05-23_0730-0740_20120526.053954.hdf 23 February 2013SST EDR Beta14

15 Aqua/MODIS ACSPO SST 23 May 2012 0800-0805 UTC – Night – Mapped onto 0.8km grid ACSPO_V2.10_AQUA_MODIS_2012-05-23_0800-0805_20120527.093405.hdf 23 February 2013SST EDR Beta15

16 Great Britain and Ireland 26 May 2012 – Day Examples ACSPO VIIRS and MODIS SST Imagery 23 February 2013SST EDR Beta16

17 NPP/VIIRS ACSPO SST 26 May 2012 1250-1300 UTC – Day – Swath Projection ACSPO_V2.10_NPP_VIIRS_2012-05-26_1250-1300_20120529.075657.hdf 23 February 2013SST EDR Beta17

18 Aqua/MODIS ACSPO SST 26 May 2012 1300-1305 UTC – Day – Swath Projection ACSPO_V2.10_AQUA_MODIS_2012-05-26_1300-1304_20120527.215350.hdf 23 February 2013SST EDR Beta18

19 NPP/VIIRS ACSPO SST 26 May 2012 1250-1300 UTC – Day – Mapped onto 0.8km grid ACSPO_V2.10_NPP_VIIRS_2012-05-26_1250-1300_20120529.075657.hdf 23 February 2013SST EDR Beta19

20 Aqua/MODIS ACSPO SST 26 May 2012 1300-1305 UTC – Day – Mapped onto 0.8km grid ACSPO_V2.10_AQUA_MODIS_2012-05-26_1300-1304_20120527.215350.hdf 23 February 2013SST EDR Beta20

21 Wind Speed 26 May 2012 – Day – 1° gridded NCEP GFS 23 February 2013SST EDR Beta21

22 VIIRS, MODIS, and AVHRR Radiance Monitoring in MICROS www.star.nesdis.noaa.gov/sod/sst/micros/ 23 February 2013SST EDR Beta22

23 Model minus Observation (“M-O”) Biases -M (Model) = Community Radiative Transfer Model (CRTM) simulated TOA Brightness Temperatures (w/ Reynolds SST, GFS profiles as input) -O (Observation) = Clear-Sky sensor (AVHRR, MODIS, VIIRS) BTs Double Differences (“DD”) for Cross-Platform Consistency -“M” used as a “Transfer Standard” -DDs cancel out/minimize effect of systematic errors & instabilities in BTs arising from e.g. -Errors/Instabilities in Reynolds SST & GFS -Missing aerosol -Possible systemic biases in CRTM -Updates to ACSPO algorithm M-O Biases and Double Differences (“DD”) 23 February 2013SST EDR Beta23

24 All AVHRRs and NPP/VIIRS are consistent to within ±0.1K VIIRS Cal change 7 Mar 2012 reset BT@M15 by +0.14K – now better in family Terra and Aqua/MODIS out of family by 0.6K – due to suboptimal CRTM coefficients in V2.02 Both were back in family after CRTM V2.1 implemented on Sep. 13, 2012 Metop-B is inconsistent with Metop-A by ~0.3 K, due to suboptimal CRTM coefficients used in CRTM V2.1 N16: unstable and out of family VIIRS recalibration CRTM V2.1 implemented Metop-B: out of family Liang, Ignatov: Stability & Radiometric Consistency between AVHRR, MODIS, and VIIRS in SST bands. JGR, 2013, submitted Double Differences in IR11 (VIIRS M15) 23 February 2013SST EDR Beta24

25 All AVHRRs, MODISs and NPP/VIIRS SSTs are consistent to within ±0.1K VIIRS Cal Change 7 Mar 2012: SST +0.10K – Out of family New SST coefficients implemented 3 May 2012: SST -0.15K – Back in family CRTM update resulted regression SSTs more noise, and the new coefficients have been implemented since Dec. 2012. More data is needed to understand their performance N16: unstable and out of family VIIRS recalibration New Reg. Coeff. used CRTM V2.1 implemented Double Differences in SST 23 February 2013SST EDR Beta25

26 VIIRS SST Imagery Is of comparable quality to Aqua MODIS or exceeds Crisp, and nicely resolves fine surface structure Striping is comparable to Aqua MODIS or exceeds VIIRS is a good instrument for SST MICROS captured the 0.14K increase in BTs on 7 Mar 2012 MICROS also captured the WUCD event (~7K) in Feb 2012 Provided feedback to SDR Team, worked to improve SDRs Radiances are Stable & consistent with AVHRRs/MODISs MODIS All MODIS bands were out of AVHRR/VIIRS family by 0.3-0.6K. Sensor was fine, but CRTM coefficients were in error. Provided feedback to CRTM Team, fixed in CRTM v2.1. MODIS Terra-Aqua 3.7 µm still inconsistent by 0.3K – working to fix Summary to Imagery and Radiance Analyses 23 February 2013SST EDR Beta26

27 IDPS and ACSPO SST Monitoring in SST Quality Monitor (SQUAM) www.star.nesdis.noaa.gov/sod/sst/squam/ 23 February 2013SST EDR Beta27

28 VCM and Ice Mask for SST in SQUAM  STAR analyses use VCM Confidently Clear data only (consistent with VCM Beta Review Analyses, Apr’2012)  SST QF have been analyzed & Discussed at several SST Telecons in Mar’2012  Based on these analyses, SST QFs were found too restrictive.  They are not used in the SST Analyses presented here, pending QF redesign ACSPO (NOAA heritage) vs. IDPS SSTs Objective: Ensure comparable SST performance in comparable SST domain Analysis of one representative day of data – 31 December 2012 in SST Quality Monitor (SQUAM) www.star.nesdis.noaa.gov/sod/sst/squam/ 23 February 2013SST EDR Beta28

29 DAY: ACSPO L2 minus OSTIA L4 31 December 2012 Deviation from Reference SST is flat & close to 0 Residual Cloud/Aerosol leakages seen as cold spots 23 February 2013SST EDR Beta29

30 DAY: IDPS L2 minus OSTIA L4 31 December 2012 More Cloud leakages in IDPS than in ACSPO “Limb Cooling” – due to SST equations/coefficients 23 February 2013SST EDR Beta30

31 DAY: ACSPO L2 minus OSTIA L4 31 December 2012 23 February 2013SST EDR Beta Shape close to Gaussian Domain and Performance Stats close to expected 31

32 DAY: IDPS L2 minus OSTIA L4 31 December 2012 IDPS sample +25% larger compared to ACSPO increased Min/Max, STDV/RSD & Larger fraction of outliers 23 February 2013SST EDR Beta32

33 DAY: ACSPO L2 minus in situ SST 31 December 2012 23 February 2013SST EDR Beta Shape close to Gaussian Domain and Performance Stats close to expected 33

34 DAY: IDPS L2 minus in situ SST 31 December 2012 IDPS sample +51% larger compared to ACSPO increased Min/Max, STDV/RSD & Larger fraction of outliers 23 February 2013SST EDR Beta34

35 DAY 31 December 2012 – Summary NOBS (%ACSPO) Min/ MaxMean/ STDMed/ RSDSkew/ Kurt ACSPO 84.4M (100%)-6.8/ +9.8+0.26/0.65+0.22/0.49+1.0/ +7.9 IDPS105.4M (125%)-33.5/+10.4-0.03/0.88+0.03/0.60-0.9/+8.2 ΔT = “VIIRS minus OSTIA” SST (expected ~0) IDPS SST domain +25% larger but all Stats degraded, compared to ACSPO Gap between Conventional and Robust stats wider in IDPS - More outliers NOBS (%ACSPO) Min/ MaxMean/ STDMed/ RSDSkew/ Kurt ACSPO 811 (100%)-1.4/ +2.2-0.11/0.46+0.12/0.37+0.4/ +3.0 IDPS 1,223 (151%)-3.8/+2.9-0.25/0.76-0.14/0.51-0.4/+3.2 ΔT = “VIIRS minus in situ” SST (expected ~0) IDPS SST domain is +51% larger but all Stats degraded, compared to ACSPO Gap between Conventional and Robust stats wider in IDPS - More outliers 23 February 201335SST EDR Beta

36 NIGHT STD DEV wrt. Reynolds L4 AVHRR & MODIS SSTs are consistent ACSPO VIIRS is consistent with MODIS & AVHRR VIIRS EDR shows larger STD, out of spec Large peaks due to suboptimal performance of Ice Mask Warm-Up Cool-Down EventIDPS shows larger STD 23 February 2013SST EDR Beta36

37 DAY STD DEV wrt. Reynolds L4 Warm-Up Cool-Down Event AVHRR & MODIS SSTs are consistent ACSPO VIIRS is consistent with MODIS & AVHRR VIIRS EDR shows much larger STD, out of spec Large peaks due to suboptimal performance of Ice Mask 23 February 2013SST EDR Beta37 IDPS shows much larger STD

38 VCM Performance for SST Remains Suboptimal IDPS domain larger than ACSPO, but SST statistics degraded SST specs are not met (including revisited in new L1RD) Improvements are needed in both day (more problematic) and night (less problematic) VCM Suboptimal SST performance is in part due to SST algorithms (e.g., limb cooling at swath edges) – work is underway to revisit Work is underway with VCM Team at U. Wisconsin (Andy Heidinger and Denis Botambekov) to fine tune VCM for SST Summary to VCM and IM Analyses in SQUAM 23 February 2013SST EDR Beta38

39 SST Data record available in CLASS from 22 Jan 2012 – onward is suboptimal and highly non-uniform As of this report, VIIRS SDR has been verified and has reached a stable and accurate performance for SST As of this report, VCM and Ice Mask performance for SST remain non-uniform and suboptimal As of this report, SST EDR reports two SSTs – skin and bulk. Work is underway to exclude bulk SST Reveals strong limb cooling and degraded performance, due to suboptimal SST Regressions which are being revisited SST QFs are suboptimal and being revisited 23 February 2013SST EDR Beta39 Recommend SST for Beta with Caveats

40 Work with VCM Team to fine-tune VCM and Ice Mask for SST Work underway with UW Andy Heidinger and Denis Botambekov Redesign SST EDR per new L1RD Only keep skin SST, and exclude bulk SST Reuse bulk SST layer to store first-guess SST Reformulate SST regression equations, to improve SST statistics and remove limb cooling at swath edges Redesign SST Quality Flags Current SST QFs are too restrictive – SST domain too small Work is underway to revisit Remaining SST Work Towards Provisional 23 February 2013SST EDR Beta40

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