Satellite Sounding Characteristic Performance Versus Radiosonde, Impact of Local Overpass Time and Uncertainty

Transcription

1 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, 2017 Darmstadt, Germany 1

2 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

3 NPROVS Data Management Schematic Environmental Data Records (EDR) INPUTS Conventional Radiosonde GFS 6-hr NWP NUCAPS: S-NPP MetOp-A MetOp-B NOAA ATOVS NOAA-18,19 MetOp-A,B GOES MIRS: S-NPP NOAA-18,19 MetOP-A,B DMSP F16,18 NOAA GRAS MetOp-A,B AIRS v.6 Aqua-EOS NASA COSMIC IASI: MetOp-A MetOp-B EUMETSAT NWP (ANAL) Special Radiosonde: JPSS GRUAN ARM, etc NOAA NOAA EUMETSAT UCAR ECMWF PROCESSING 3 day delay Conventional Visualization Tools: ODS PDISP NARCS Special 14 day delay OUTPUTS FTP 4 million 2008 Conventional Collocation Archive 30, Special Collocation Archive Algorithm Development FTP VALAR (+SDR)

4 NPROVS Graphical Analysis Tools

5 Coast Land Island (Coast) Island (Inland) Ship Dropsonde +/- 6 hr 150 km Conventional Synoptic Radiosonde

6 NUCAPS S-NPP (NSR) NUCAPS S-NPP (FSR) NUCAPS MetOp-B AIRS v6 IR-only NOAA Unique Combined Atmospheric Processing System NUCAPS 6

7 IR pass QC Land Temp H20 Fraction January

8 IR pass QC Sea Temp H20 Fraction August

9 MiRS Sea Temp H20 Fraction August

10 NOAA Products Validation System (NPROVS) Coast Land Island (Coast) Island (Inland) Ship Dropsonde MetOp S-NPP < 3hr Aqua Number of collocations: 828 (185 unique locations) August 21, 2017 (8z) to July 31, 2017 (23z)

11 NOAA Products Validation System (NPROVS) Coast Land Island (Coast) Island (Inland) Ship Dropsonde MetOp S-NPP > 3hr Aqua Number of collocations: 844 (265 unique locations) August 21, 2017 (8z) to July 31, 2017 (23z)

12 Temperature IR pass QC MetOp S-NPP < 3hr AIRS H20 Fraction August

13 Temperature IR pass QC MetOp S-NPP > 3hr AIRS H20 Fraction August

14 NUCAPS S-NPP (NSR) 14

15 NUCAPS MetOp-B 15

16 NUCAPS S-NPP (NSR) 16

17 NUCAPS MetOp-B 17

18 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 Center CIRA (Ft Collins), PMRS Global Climate Observing System (GCOS) Reference Upper Air Network (GRUAN) www,gruan.org RIVAL, RS41/RS92 Dual including GPSRO Targeting (ARM, JPSS, GRUAN ) Special Observations

19 Coast Land Island (Coast) Island (Inland) Ship Dropsonde Special Radiosonde subsample containing GRUAN 2013 to 2017

20 Guidelines for Uncertainty Measurements (GUM) Given two measurement (m1, m2), their uncertainty (u 1, u 2 ) and uncertainty due to spatial / temporal mismatch (σ), then two observations are in statistical agreement if k.le. 2: m m2 < k σ + u1 u2 Immler et.al Atmos. Meas. Tech., 3, , doi: /amt u2 is GRUAN (m1) uncertainty given u1 is m2 uncertainty needed σ is combined mismatch and inter-platform uncertainty needed 4

21 Strategy 1) ABS (m1 m2) < k (σ 2 + u1 2 + u2 2 ) 1/2 2) k = ABS (m1 m2) / u2 for k=2 statistical agreement 3) σ 2 + u1 2 = (( k /2) 2 1) (u2) 2 4) u1 = (( k /2) 2 1) 1/2 (u2) given u2, quantify the (σ 2 + u1 2 ) required for agreement worst case estimate of u1

22 NUCAPS NSR IASI EUMETSAT IASI NSR AIRS v6 IR-only Validation data-sets in following slides are for common samples of IR satellite soundings which Pass QC blue 22

23 GRUAN Uncertainty Profile Uncertainty Estimates (u1).66, 1.1, ,.40,.40.10,.47,.72.07,.37,.43.19,.73,.84.30,.62,.69.01,.03,.04.03,.16,.18.08,.37, ,.46,.51.05,.33,.39 +/- 3 hour and 50 km 23

24 GRUAN Uncertainty Profile Uncertainty Estimates (u1).65,.89,.89.25,.43,.43.17,.65,.75.10,.37,.47.21,.62,.80.30,.59,.67.01,.02,.03.05,.10,.13.13,.32, ,.40,.67.06,.27,.45 +/- 3 hour and 50 km 24

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 25