• V1.0 was released in 2009 • SQUAM analyzes bias of global satellite L2/L3 SSTs w.r.t. 2 types of reference SSTs - (1) in situ (from the NOAA iQuam system) ; and (2) global gap-free L4 SST analyses. - L4 analyses offer global coverage (“instantaneous look”) and greater uniformity in space & time - The global distributions of the ΔTs are expected to be centered at ~0 and close to Gaussian • Plots: Maps, Histograms, Time Series, Dependencies, and Hovmöller Diagrams • SQUAM is a GHRSST resource for near real-time monitoring and validation of major global satellite & blended SST products produced by the SST community • Updated to V2.0 in 2017 - Focus on NOAA & partners products (can add other products by data users/ producers request) - Polar page: Selection of ACSPO VIIRS, ACSPO AVHRR GAC, and AVHRR FRAC (ACSPO & OSI SAF) - New Geo page created: H08 AHI; option to display vs. GMT and Local Time - L4 page: reduced list of products (NOAA partners; most informative for SQUAM analyses) - New features: SSES bias correction, time aggregation, etc. - Interface redesign • Replaced the ACSPO development products with operational products • NOAA-20 provisioned (pending ACSPO 2.50 operational deployment) • Added ACSPO G16 ABI; G17 ABI provisioned (currently disabled) • Full line of ACSPO L3U provisioned (pending ACSPO 2.50 operational deployment) SQUAM Background Structure (Newly added) Geo: G16 1. NOAA/NESDIS/STAR 2. Global Science and Technology, Inc 3.Colorado State University/CIRA Kai He1,2, Xinjia Zhou1,3, Sasha Ignatov1, Olafur Jonasson1,2 Update to SST Quality Monitor (SQUAM) Polar: GAC L2P vs. L3U Comparison between Metop-A GAC L2P and L3U • Global statistics are comparable between L2P and L3U GHRSST XIX Meeting, Darmstadt, Germany, 4 - 8 June 2018 SQUAM v2.1: https://www.star.nesdis.noaa.gov/sod/sst/squam/ What’s new in v2.1 Polar L2/L3 Geo L2/L3 Analysis L4 High Resolution S-NPP VIIRS (N20 coming soon) ACSPO L2P/L3U AVHRR FRAC ACSPO L2P OSISAF L2P H08 AHI ACSPO L2P/L3U G16 ABI ACSPO L2P/L3U MUR (JPL) Low Resolution AVHRR GAC ACSPO OPR L2P ACSPO RAN L2P/L3U CMC (Environment Canada) OSTIA (Met Office) OSTIA RAN (Met Office) GMPE (Met Office) Geo Polar Blended (NOAA) Reynolds (NOAA) GAMSSA (BoM) • Operational product (ACSPO 2.50) • L2P/3U - Subsampled to 1 image per hour - Planning to move to L2C/3C (hourly collated) • UTC based (default) - For monitoring sensor performance • Local solar time based - For scientific analysis, such as diurnal cycle effect G16 ABI: L2P vs. L3U • Mean and SD Statistics of (ABI SST – CMC) are comparable between L2P and L3U L4 Analyses L4 SSTs: CMC, OSTIA, GMPE, Reynolds, GAMSSA, MUR, OSTIA RAN, GPB • Added by Request of the NOAA Coral Reef Watch Team • OSTIA Reanalysis (RAN): Jan 1985 – Dec 2007 • NOAA Geo-Polar Blended (GPB): Sep 2002 - present SD(L4 SST – in situ) Summary • SQUAM v2.1 has been expanded to include several new products • Only operational products are now displayed in SQUAM • Back-end processing has been rewritten and highly optimized • Data access page is added Future work - ACSPO G16 ABI - A consistent line of L3U - OSTIA RAN and GPB L4 - G17 and N20 buttons provisioned Alex.Ignatov@noaa.gov Acknowledgments • This work is supported by the JPSS and GOES-R Program Offices, and the NOAA Ocean Remote Sensing (ORS) Program. • The views, opinions, and findings in this report are those of the authors and should not be construed as an official NOAA or U.S. government position or policy Night L3U SD(SST – CMC), day SD(SST – in situ), day SD(SST – CMC), night SD(SST – in situ), night Day L3U Night L2P Day L2P Mean(SST – CMC) SD(SST – CMC) G16 ABI: L2C & L3C • SD reduced by up to ~0.3K (in RMS sense) in L2C/3C • NOBS and clear-sky ratio remarkably boosted (~2M more valid SSTs) Mean(SST – CMC) SD(SST – CMC) Matchup(SST – CMC) Clear%(SST – CMC) - Add N20 VIIRS and G17 ABI - Two ACSPO lines: OPR + RAN - For ABI/AHI, switch from L2P/3U to L2/3C - Add Metop-C SST when launched in Sep 2018