Validation Update Eric Fetzer AIRS Science Team Meeting February 21, 2001 Pasadena Eric Fetzer 1 Validation Update February 21, 2001
Today’s Topics • Report on the February 7 Aqua Validation Working Group meeting at GSFC. • Validation software status • Update on primary validation data sources Eric Fetzer 2 Validation Update February 21, 2001
Aqua Validation Meeting General Impressions • Several common validation issues – Clear sky identification is key – Upwelling radiance, SST, LST under clear sky is next – Upper trop water of particular concern for CERES • Standards for data distribution and formatting are needed • The selected Aqua validation proposals will be announced on or near February 23, according to David Starr Eric Fetzer 3 Validation Update February 21, 2001
AIRS Aqua-wide Validation Issues From page 13 of the current AIRS Team Science Validation Plan: Inter-Aqua Data for AIRS Standard AIRS Validation Focus Product Validation MODIS cloud retrieval Clear-sky flag, cloud clearing, VIS / NIR cloud fraction AMSR-E SST SST retrieval MODIS SST SST retrieval MODIS, CERES radiance Radiance CERES OLR OLR CO and Methane from MOPPIT and CO, Methane retrievals network Surface-based VIS / NIR VIS / NIR retrievals MODIS low cloud indicator VIS / NIR low cloud algorithm Eric Fetzer 4 Validation Update February 21, 2001
Aqua Validation Meeting Relevant Instrument Team Activities • Vince Salomonson on MODIS – Steve Ackerman and others at U. Wisconsin have experience identifying clear sky conditions – Upwelling radiance from many sources, e. g., dedicated M-AERI cruise will be used. • Some will be useful in our efforts • See their Validation Plan linked to AIRS home page Eric Fetzer 5 Validation Update February 21, 2001
Aqua Validation Meeting Relevant Instrument Team Activities • Bruce Weilicki on CERES – Early processing backlogged • complex data availability requirements for processing • ephemeris information delayed ~1 month – OLR product calculation requires accurate upper tropospheric water vapor • They will oversee a DAO-ECMWF shoot-out this spring for upper trop water vapor (and land skin T / diurnal cycle) Eric Fetzer 6 Validation Update February 21, 2001
Aqua Validation Meeting Relevant Instrument Team Activities • Bruce Weilicki on CERES (continued) – Polar temperature inversions are a concern (!) – Upper trop water vapor is important (!) – They will measure clear sky ocean radiance with M-AERI Eric Fetzer 7 Validation Update February 21, 2001
Aqua Validation Meeting Relevant Instrument Team Activities • Elena Loebl on AMSR-E – They have well-instrumented land surface experiments • Measure T, soil moisture • Large area of instrumentation (~50 km diameter) • Several locations in central Asia – Tibetan plateau (high altitudes) – Mongolia (middle altitudes) • The effort is led by Eni Njoku at JPL Eric Fetzer 8 Validation Update February 21, 2001
JPL Validation Software • A hierarchy is analyses is needed – Granule- and footprint-level display – Manipulation of correlative data will be the next development phase – Large-scale statistics (as with GSTAT files) • An unmet action item by JPL is delivery of Vendaval 2.0 – Currently bullet-proofing the code – Will include a suite of graphics software Eric Fetzer 9 Validation Update February 21, 2001
Correlative Data Activities • Acquisition, cataloging of three data types: – Sample radiosondes from ESDIS • In HDF • Latest test set is matched to December 15 simulations – ARM CART best estimates • In NetCDF • We have a one month sample for a non-simulation period – Ocean buoys • In ASCII • Currently testing a one-week sample that includes Dec 15 -- We are about to test regular, daily ingest of all these data - - Eric Fetzer 10 Validation Update February 21, 2001
Correlative Data Activities (continued) • A common input format to AIRS forward model calculations (RTP) has been defined. Available at: – http://asl.umbc.edu/pub/motteler/rtp/rtpspec/rtpspec.html • Software and format issues will be reviewed after selection of Aqua validation proposals Eric Fetzer 11 Validation Update February 21, 2001
ARM CART Data Flow Match-Ups by Site and Versioning • Match-up • SGP • Data SGP 25Aug01 0Z • • • UW SGP 25Aug01 12Z SGP 26Aug02 0Z SGP SGP 26Aug02 12Z SGP 25Aug01 0Z Data SGP 25Aug01 12Z SGP 27Aug02 0Z SGP 26Aug02 0Z + Golfballs SGP 26Aug02 12Z SGP 27Aug02 0Z Interface Issues • • for Site Match- • • • • Up: • • • Match-up TWP Data - Versioning UW -Format TWP TWP 25Aug01 0Z - METADATA Match-up NSA Data TWP 25Aug01 12Z Data TWP 26Aug02 0Z TWP 26Aug02 12Z TWP 27Aug02 0Z TLSCF Long-Term Match-Ups • • • Long-Term TWP Match-ups Long-Term NSA Match-ups Long-Term SGP Match-ups Interface Issues TDS • • • UW For Long-Term NSA NSA 25Aug01 0Z Match-Ups: NSA 25Aug01 12Z Data - Version NSA 26Aug02 0Z NSA 26Aug02 12Z Match-Up -Format NSA 27Aug02 0Z Software -Accumulation • • • Time - METADATA Other Sites: e. g. Brazil, Australia Eric Fetzer 12 Validation Update February 21, 2001
Radiosonde (PREPQC) Data Handoff Data Users Data Provider Steps Science Team Larry Operations Team McMillin (currently NOAA -Tuning Mike Theobald Edward Olsen - Validation for testing) Mitch Goldberg Quentin -Validation PREPQC Sun HDF-EOS Point NOAA Joel Susskind GDAAC TDS GSFC EMC -Validation Matchups HDF-EOS Swath Dave Staelin (after L+12 Months) TLSCF - Validation MIT Phil Rosenkranz Interface Issues Interface Issues Interface Issues -Validation (and Solutions): (and Solutions): (and Solutions): - Data - Data - Data Larrabee Strow UMBC PREPQC Matchups PREPQC -RTA - Frequency - Format - Format four files daily HDF-EOS Swath HDF-EOS Point JPL Edward Olsen - Data Volume - Content - Content -Radiance Bias/Tuning 75 MB/day nominally Selected Fields -Validation - Latency 100 matchups/day TLSCF - Subscription -Trend Analyses 24 hours Push Interface Eric Fetzer - Format - Data Issues: -Validation BUFR Golden Day Matchups - Data - Metadata Bjorn Lambrigtsen - Ingest - Format Matchups -Validation - Format HDF-EOS Swath - Format -Content Luke Chen - Content HDF-EOS Swath -Radiance bias studies -Frequency Radiosonde or - Content -Timeliness Evan Fishbein AVN Forecast nominally -Retrieval QA assessment -Pull for selected Profiles 30 matchups/day Eric Fetzer 13 Validation Update February 21, 2001
Data Flow for AIRS Sea Surface Temperature Product Validation Launch + 150 days (or when product available) . . . Special SVP drifters Special SVP drifters Apply surface Compare L2 SST gradient correction Day vs night Determine rejection Golf Ball Module scan angle Golf Ball Module Buoy match-ups criteria Buoy match-ups including Column H 2 0 including Clear cases Clear cases Sea Surface Sea Surface Temperature Product Temperature Product Basic drifters And Truth Pointers Basic drifters Compare L2 SST And Truth Pointers Adjust for obvious Day vs night temperature scan angle effects Column H 2 0 Sort using cloud flag Day/night Data Products: Statistics as function Scan angle of scan angle, day-night, surface Truth Data: Truth Data: gradient, column H 2 0, cloud fraction, NOAA Surface Marine NOAA Surface Marine surface emissivity. GDC Drifter Data GDC Drifter Data Compare surface Buoy matchups Compare L2 SST Buoy matchups emissivity product: Cloudy cases SST Climatology Cloudy cases Sort by cloud Day vs night SST Climatology Cloud fraction fraction � Scan angl e Scan angle Cloud fraction Emissivity Surface Emissivity model Eric Fetzer 14 Validation Update February 21, 2001
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