Satellite Sounding Characteristic Performance Versus Radiosonde, Impact of
Local Overpass Time and Uncertainty
Tony Reale, Bomin Sun, Mike Pettey and Ryan Smith(Lihang Zhou … JPSS)
12/04/2017
International ATOVS Study Conference (ITSC-21)Nov 29 to Dec 5, 2017Darmstadt, Germany
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OUTLINE• NPROVS collocations of satellite and radiosondes provide an “enterprise” validation approach … “historical ITOVS function”
• Impact of local satellite overpass on sounding product assessment (bias) using synoptic radiosonde
• Sounding product assessment (uncertainty estimate) using GCOS Reference Upper Air Network (GRUAN) radiosonde …
• Summary
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Conventional Collocation
Archive
Conventional Special
ConventionalRadiosonde
GFS 6-hr NWP
Special Radiosonde:
JPSSGRUANARM, etc
NUCAPS:S-NPP
MetOp-AMetOp-B
NOAA
MIRS:S-NPP
NOAA-18,19MetOP-A,B
DMSP F16,18
NOAA
AIRS v.6Aqua-EOS
NASA
IASI:MetOp-AMetOp-B
EUMETSAT
GOES
NOAA
ATOVSNOAA-18,19MetOp-A,B
NOAA
COSMIC
UCAR
GRASMetOp-A,B
EUMETSAT
Special Collocation
Archive
3 day delay
FTP
VALAR(+SDR)
14 day delay
FTP
AlgorithmDevelopment
Visualization Tools:ODS
PDISPNARCS
INPUTS
PROCESSING
OUTPUTS
NPROVS Data Management Schematic
NWP (ANAL)
ECMWF
Environmental Data Records (EDR)
https://www.star.nesdis.noaa.gov/smcd/opdb/nprovs
4 million2008…
30,0002013…
NPROVS Graphical Analysis Tools
https://www.star.nesdis.noaa.gov/smcd/opdb/nprovs
Coast Land Island (Coast) Island (Inland) Ship Dropsonde
Conventional Synoptic Radiosonde
+/- 6 hr150 km
6NOAA Unique Combined Atmospheric Processing System … NUCAPS
NUCAPS S-NPP (NSR)
NUCAPS MetOp-B
NUCAPS S-NPP (FSR)
AIRS v6 … IR-only
7January 2017
H20 Fraction
IR pass QC
Land
Temp
8August 2017
IR pass QC
Sea
Temp H20 Fraction
9August 2017
MiRS
Sea
Temp H20 Fraction
Coast Land Island (Coast) Island (Inland) Ship DropsondeNOAA Products Validation System (NPROVS)
Number of collocations: 828 (185 unique locations) August 21, 2017 (8z) to July 31, 2017 (23z)
MetOpS-NPP < 3hrAqua
Coast Land Island (Coast) Island (Inland) Ship DropsondeNOAA Products Validation System (NPROVS)
Number of collocations: 844 (265 unique locations) August 21, 2017 (8z) to July 31, 2017 (23z)
MetOpS-NPP > 3hrAqua
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MetOpS-NPP < 3hrAIRS
August 2017
IR pass QCTemperature
H20 Fraction
13
MetOpS-NPP > 3hrAIRS
August 2017
IR pass QCTemperature
H20 Fraction
14NUCAPS S-NPP (NSR)
15NUCAPS MetOp-B
16NUCAPS S-NPP (NSR)
17NUCAPS MetOp-B
Global Climate Observing System (GCOS) Reference Upper Air Network (GRUAN)
www,gruan.org
JPSS Funded Dedicated RAOB(Lihang Zhou (STAR), Lori Borg (SSEC) …)
• DOE ARM (SGP, NSA, ENA)(2) per week, GRUAN Processed (GP) includes dual sequential …
• AEROSE (GP), • CALWATER, El-Nino RR,
Beltsville, ARM Mobile Sterling Field Support CenterCIRA (Ft Collins), PMRS
RIVAL, RS41/RS92 Dual including GPSRO Targeting(ARM, JPSS, GRUAN …)
Special Observations
Coast Land Island (Coast) Island (Inland) Ship Dropsonde
2013 to 2017
Special Radiosonde … subsample containing GRUAN
Given two measurement (m1, m2), their uncertainty (u1, u2) and uncertainty due to spatial / temporal mismatch (σ), then two observations are in statistical agreement if “k” .le. 2:
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21
221 uukmm ++<− σ
u2 is GRUAN (m1) uncertainty … givenu1 is “m2” uncertainty … needed
σ is combined mismatch and inter-platform uncertainty … needed
Guidelines for Uncertainty Measurements (GUM)
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Immler et.alAtmos. Meas. Tech., 3, 1217–1231, 2010www.atmos-meas-tech.net/3/1217/2010/doi:10.5194/amt-3-1217-2010
1) ABS (m1 – m2) < k (σ2 + u12 + u22)1/2
2) “k” = ABS (m1 – m2) / u2
3) σ2 + u12 = ((“k”/2)2 –1) (u2)2
4) u1 = ((“k”/2)2 –1)1/2 (u2)
… given u2, quantify the (σ2 + u12 ) required for “agreement”… worst case estimate of u1
for k=2 … statistical agreement
Strategy
22Validation data-sets in following slides are for “common” samples of ”IR” satellite soundings which Pass QC … “blue”
NUCAPS NSR IASI EUMETSAT
IASI NSR AIRS v6 … IR-only
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.66, 1.1, 1.1
.25, .40, .40
.10, .47, .72
.07, .37, .43
.19, .73, .84
.30, .62, .69
.01, .03, .04
.03, .16, .18
.08, .37, .47---, .46, .51
.05, .33, .39
ProfileUncertainty Estimates (u1)
GRUANUncertainty
GRUAN @ +/- 3 hour and 50 km
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.65, .89, .89
.25, .43, .43
.17, .65, .75
.10, .37, .47
.21, .62, .80
.30, .59, .67
ProfileUncertainty Estimates (u1)
GRUANUncertainty
.01, .02, .03
.05, .10, .13
.13, .32, .54---, .40, .67
.06, .27, .45
GRUAN @ +/- 3 hour and 50 km
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Summary NPROVS provides “enterprise” assessment for satellite derived atmospheric sounding products … past, current, future … legacy “ITSC” function … goal to expand product suites accessed.
Strategy and results on sounding product characteristic performance and impact of systematic local satellite overpass / synoptic radiosonde time differences
Such systematic differences (bias) when observed are more likely “internally” rooted (tuning)
Examples of strategy to estimate satellite product (and nwp) uncertainty traceable to GRUAN across NUCAPS, IASI EU, AIRS and ECMWF … GUM
Special “RIVAL” Campaign (ARM, GRUAN, JPSS), GPSRO Targeting … Sharing with ITSC (Climate) community