Validation Update Eric Fetzer AIRS Science Team Meeting February - - PowerPoint PPT Presentation

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Eric Fetzer February 21, 2001 1

Validation Update

Validation Update

Eric Fetzer AIRS Science Team Meeting February 21, 2001 Pasadena

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Eric Fetzer February 21, 2001 2

Validation Update

Today’s Topics

• Report on the February 7 Aqua Validation

Working Group meeting at GSFC.

• Validation software status
• Update on primary validation data sources

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Eric Fetzer February 21, 2001 3

Validation Update

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

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Eric Fetzer February 21, 2001 4

Validation Update

AIRS Aqua-wide Validation Issues

From page 13 of the current AIRS Team Science Validation Plan:

Inter-Aqua Data for AIRS Standard Product Validation AIRS Validation Focus 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 network CO, Methane retrievals Surface-based VIS / NIR VIS / NIR retrievals MODIS low cloud indicator VIS / NIR low cloud algorithm

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Eric Fetzer February 21, 2001 5

Validation Update

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

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Eric Fetzer February 21, 2001 6

Validation Update

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)

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Eric Fetzer February 21, 2001 7

Validation Update

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

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Eric Fetzer February 21, 2001 8

Validation Update

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

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Eric Fetzer February 21, 2001 9

Validation Update

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

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Eric Fetzer February 21, 2001 10

Validation Update

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 -

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Eric Fetzer February 21, 2001 11

Validation Update

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

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Eric Fetzer February 21, 2001 12

Validation Update

ARM CART Data Flow and Versioning

TWP 25Aug01 0Z TWP 25Aug01 12Z TWP 26Aug02 0Z TWP 26Aug02 12Z TWP 27Aug02 0Z

• • •
• • •

UW TWP Data

• • •

SGP 25Aug01 0Z SGP 25Aug01 12Z SGP 26Aug02 0Z SGP 26Aug02 12Z SGP 27Aug02 0Z

• • •

UW SGP Data

TLSCF TDS

Match-Up Software

• SGP 25Aug01 0Z

SGP 25Aug01 12Z SGP 26Aug02 0Z SGP 26Aug02 12Z SGP 27Aug02 0Z + Golfballs

• Match-up

SGP Data Match-up TWP Data Match-up NSA Data

NSA 25Aug01 0Z NSA 25Aug01 12Z NSA 26Aug02 0Z NSA 26Aug02 12Z NSA 27Aug02 0Z

• • •
• • •

UW NSA Data Long-Term Match-Ups Long-Term SGP Match-ups Long-Term TWP Match-ups Long-Term NSA Match-ups Match-Ups by Site Interface Issues for Site Match- Up:

• Versioning
• Format
• METADATA

Interface Issues For Long-Term Match-Ups:

• Version
• Format
• Accumulation

Time

• METADATA

Other Sites: e. g. Brazil, Australia

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Eric Fetzer February 21, 2001 13

Validation Update

Radiosonde (PREPQC) Data Handoff

NOAA EMC GDAAC

Operations Team (currently Mike Theobald for testing) Interface Issues (and Solutions):

• Data

PREPQC

• Frequency

four files daily

• Data Volume

75 MB/day

• Latency

24 hours

• Format

BUFR

• Ingest

Edward Olsen

TLSCF

Quentin Sun

TDS

Interface Issues (and Solutions):

• Data

PREPQC

• Format

HDF-EOS Point

• Content

Selected Fields

• Subscription

Push

• Data

Matchups

• Format

HDF-EOS Swath

• Content

nominally 30 matchups/day Interface Issues (and Solutions):

• Data

Matchups

• Format

HDF-EOS Swath

• Content

nominally 100 matchups/day

• Data

Golden Day Matchups

• Format

HDF-EOS Swath

• Content

Radiosonde or AVN Forecast for selected Profiles

Joel Susskind

Science Team

Mitch Goldberg

• Validation
• Validation

Data Provider Steps Data Users

• Tuning
• Validation

Larry McMillin GSFC NOAA TLSCF Eric Fetzer

• Validation

JPL

Interface Issues:

• Metadata
• Format
• Content
• Frequency
• Timeliness
• Pull
• Radiance bias studies

Luke Chen Edward Olsen

• Radiance Bias/Tuning
• Validation
• Trend Analyses

Matchups HDF-EOS Swath (after L+12 Months) PREPQC HDF-EOS Point

• Validation

Bjorn Lambrigtsen Phil Rosenkranz

• Validation
• Validation

Dave Staelin MIT

• Retrieval QA assessment

Evan Fishbein UMBC Larrabee Strow

• RTA

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Eric Fetzer February 21, 2001 14

Validation Update

Data Flow for AIRS Sea Surface Temperature Product Validation

Launch + 150 days (or when product available) . . .

Golf Ball Module including Sea Surface Temperature Product And Truth Pointers Golf Ball Module including Sea Surface Temperature Product And Truth Pointers Truth Data: NOAA Surface Marine GDC Drifter Data SST Climatology Truth Data: NOAA Surface Marine GDC Drifter Data SST Climatology Sort using cloud flag Day/night Scan angle Buoy matchups Cloudy cases Buoy matchups Cloudy cases Buoy match-ups Clear cases Buoy match-ups Clear cases Special SVP drifters Compare L2 SST Day vs night scan angle Column H20 Compare surface emissivity product: Cloud fraction Scan angle Emissivity model Special SVP drifters Apply surface gradient correction Determine rejection criteria Sort by cloud fraction Compare L2 SST Day vs night

• Scan angl

e Cloud fraction Surface Emissivity Basic drifters Adjust for obvious temperature effects Basic drifters Compare L2 SST Day vs night scan angle Column H20

Data Products: Statistics as function

• f scan angle, day-night, surface

gradient, column H20, cloud fraction, surface emissivity.