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

1

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

2

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

12

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:

22

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)

4

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

23

.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

24

.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

25

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