1 / 22

Configuration Change Request – ACSPO vs. IDPS SST 29 July 2013

Configuration Change Request – ACSPO vs. IDPS SST 29 July 2013. VIIRS Sea Surface Temperature (SST): ACSPO vs. IDPS Alexander Ignatov NOAA/STAR. Advanced Clear-Sky Processor for Oceans (ACSPO): NOAA heritage SST system and Line of products ACSPO Products & Versions

thyra
Download Presentation

Configuration Change Request – ACSPO vs. IDPS SST 29 July 2013

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. Configuration Change Request – ACSPO vs. IDPS SST29 July 2013 VIIRS Sea Surface Temperature (SST): ACSPO vs. IDPS Alexander Ignatov NOAA/STAR VIIRS SST - ACSPO vs IDPS

  2. Advanced Clear-Sky Processor for Oceans (ACSPO): NOAA heritage SST system and Line of products ACSPO Products & Versions Operational: May 2008 – NOAA-17, -18, Metop-A AVHRR GAC; Mar 2009 – NOAA-19 GAC; Apr 2009 – Metop-A AVHRR FRAC; Oct 2012 – Metop-B AVHRR GAC and FRAC Experimental: Jan 2012 – S-NPP VIIRS, Terra & Aqua MODIS Versions: May 2008 – v1.0; Apr 2009 – v1.1; Aug 2009 – v1.2; Mar 2010 – v1.3; Dec 2010 – v1.4; Jan 2012 – v2.0; May 2013 – v2.2; Oct 2013 – v2.3 ACSPO Features Provides clear–sky radiances in addition to SST (used by NCEP for RTG) Well tested and validated, closer to meeting the L1RD specs than IDPS RTM capability used for cloud screening & physical SST ACSPO Users Heritage NOAA Users: NCEP RTG and RTOFS; NOS Data assimilation; Coral Reef Watch; POES-GOES-Blended; Coast / Ocean Watch External Users: EUMETSAT; UK Met Office; JMA Background: ACSPO VIIRS SST - ACSPO vs IDPS

  3. Background: IDPS • Interface Data Processing Segment (IDPS) SST EDR • No heritage with AVHRR, MODIS • Newly introduced for VIIRS • Performance – 3 major issues • SST Algorithm (Regression Equations) – Fixed in v8.0 • VIIRS Cloud Mask suboptimal – working with VCM Team to fix • VIIRS Ice Mask suboptimal – Fixes underway • IDPS SST EDR Features • No clear sky radiances – cannot support NCEP RTG • Substantial effort to meet specs • No RTM capability – potential for cloud mask/SST limited • IDPS SST EDR Users • No NOAA users expressed interest in using IDPS SST • No external users expressed interest in using IPDS SST VIIRS SST - ACSPO vs IDPS

  4. NOAA Cal/Val Tools for SSTs and Radiances SQUAM - SST Quality Monitor www.star.nesdis.noaa.gov/sod/sst/squam/ • Monitor SST Products (L2, L3, L4) for Self- and Cross-Consistency; Validate against in situ SSTs (iQuam) iQuam - In situ Quality Monitor (input to SQUAM) www.star.nesdis.noaa.gov/sod/sst/iquam/ • QC in situ SSTs, Monitor on Web, Distribute to users MICROS - Monitoring IR Clear-sky Radiances over Oceans for SST www.star.nesdis.noaa.gov/sod/sst/micros/ • Monitor Clear-sky ocean radiances for Self- and Cross-Consistency; Validate against CRTM simulations VIIRS SST - ACSPO vs IDPS

  5. IDPSand ACSPOSSTs have been continuously Monitored in SST Quality Monitor (SQUAM) since 22 Jan 2012 www.star.nesdis.noaa.gov/sod/sst/squam/ VIIRS SST - ACSPO and IDPS

  6. ACSPO – IDPS Comparisons • Use SST Quality Monitor - SQUAM www.star.nesdis.noaa.gov/sod/sst/squam/ • Comparisons stratified by Day and Night • IDPS vs. ACSPO are compared globally, to check • SST Domain • SST Performance Statistics • Methodology • Analyze VIIRS L2 minus reference L4 SST (OSTIA) and against in situ SSTs from in situ Quality Monitor (iQuam) • Difference expected to be near-zero & near-Gaussian • Cold anomalies likely indicate residual cloud/aerosol VIIRS SST - ACSPO and IDPS

  7. 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 VIIRS SST - ACSPO and IDPS

  8. DAY: IDPS L2 minus OSTIA L4 31 December 2012 • More Cloud leakages in IDPS than in ACSPO • “Limb Cooling” – due to SST equations/coefficients VIIRS SST - ACSPO and IDPS

  9. DAY: ACSPO L2 minus OSTIA L4 31 December 2012 • Shape close to Gaussian • Domain and Performance Stats close to expected VIIRS SST - ACSPO and IDPS

  10. 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 VIIRS SST - ACSPO and IDPS

  11. DAY: ACSPO L2 minus in situ SST 31 December 2012 • Shape close to Gaussian • Domain and Performance Stats close to expected VIIRS SST - ACSPO and IDPS

  12. 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 VIIRS SST - ACSPO and IDPS

  13. DAY 31 December 2012 – Summary 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 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 VIIRS SST - ACSPO and IDPS

  14. NIGHT STD DEV wrt. Reynolds L4 www.star.nesdis.noaa.gov/sod/sst/squam/ IDPS SST: Larger STD than ACSPO SST • All ACSPO SSTs – AVHRR, MODIS, VIIRS – are consistent • ACSPO products are comparable to EUMETSAT OSI SAF Metop product • IDPS VIIRS SST shows larger STD; Recently, closer to specs at night • Based on 18mo monitoring, ACSPO consistently outperforms IDPS VIIRS SST - ACSPO vs IDPS

  15. DAY STD DEV wrt. Reynolds L4 www.star.nesdis.noaa.gov/sod/sst/squam/ IDPS SST: Much larger STD than ACSPO SST • All ACSPO SSTs – AVHRR, MODIS, VIIRS – are consistent • ACSPO products are comparable to EUMETSAT OSI SAF Metop product • IDPS VIIRS SST shows much larger STD; Out of spec during daytime • Based on 18mo monitoring, ACSPO consistently outperforms IDPS VIIRS SST - ACSPO vs IDPS

  16. VIIRS SST In family with AVHRR/MODIS SSTs www.star.nesdis.noaa.gov/sod/sst/micros/ CRTM V2.1 implemented New Reg. Coeff. used VIIRS recalibration N16: unstable and out of family • 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 VIIRS SST - ACSPO vs IDPS

  17. VIIRS is good sensor for SST Radiances: Stable, accurate, consistent w/AVHRRs & MODISs Quality of SST Imagery comparable or exceeds MODIS NOAA has two operational Level 2 SST products Advanced Clear-Sky Processor for Oceans (ACSPO) Interface Data Processing Segment (IDPS) EDR Status of ACSPO Will go operational later in 2013 So far, ACSPO performs better than IDPS Status of IDPS “Beta” (available to users via CLASS). Quality suboptimal due to 1) SST algorithms; 2) Cloud Mask; 3) Ice Mask Working to fix for “provisional” stage Recommend select ACSPO as NOAA L2 SST Product Conclusion ACSPO and VIIRS SST Products

  18. Back-Up Slides VIIRS SST - ACSPO vs IDPS

  19. Example ACSPO SST Imagery S-NPP/VIIRS vs. Aqua/MODIS Gulf of Mexico 23 May 2012 – Night VIIRS SST - ACSPO vs IDPS

  20. 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 VIIRS SST - ACSPO vs IDPS

  21. 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 VIIRS SST - ACSPO vs IDPS

  22. VIIRS vs. MODIS and AVHRR Summary S-NPP and Aqua fly close orbits @1:30am/pm • The two images are separated by ~30min ACSPO VIIRS vs. MODIS SST Imagery • SST comparable between S-NPP VIIRS and Aqua MODIS • Striping in VIIRS less pronounced than in MODIS • VIIRS SST imagery is sharper & reveals more structure ACSPO VIIRS vs. MODIS Cloud Mask • Clouds move between different S-NPP and Aqua overpasses, very consistent across two sensors otherwise ACSPO SST is consistent across VIIRS, MODIS, AVHRR • Other analyses suggest consistency of VIIRS and AVHRR SSTs VIIRS SST - ACSPO vs IDPS

More Related