U.S. DEPARTMENT OF COMMERCE NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION NATIONAL WEATHER SERVICE ' NATIONALMETEOROLOGICAL CENTER OFFICE NOTE 368 OPC UNIFIED MARINE DATABASE VERIFICATION SYSTEM Vera M. Gerald National MeteorologicalCenter This is an unreviewedmanuscript, primarily intended for informal exchange of information among NMC staff members
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U.S. DEPARTMENT OF COMMERCENATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION
NATIONAL WEATHER SERVICE' NATIONAL METEOROLOGICAL CENTER
OFFICE NOTE 368
OPC UNIFIED MARINE DATABASE VERIFICATION SYSTEM
Vera M. GeraldNational Meteorological Center
This is an unreviewed manuscript, primarily intended for informalexchange of information among NMC staff members
U. S. DEPARTMENT OF COMMERCENATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION
OCEAN PRODUCTS CENTER
TECHNICAL NOTE*
OPC Unified Marine Database Verification System
Vera M. Gerald
THIS IS AN UNREVIEWED MANUSCRIPT, PRIMARILY INTENDED FOREXCHANGE OF INFORMATION AMONG NMC STAFF MEMBERS
INTERNAL
*OPC Contribution No. 43NMC Office Note No. 368
OPC CONTrIHUTIONS SERIES
Development of Forecast L. UKKuuUnGuidance for Santa AnraConditions.
2.Lake Erie Wave Height W. RICHARDSONForecasts Generated by o.J. SCHWABEmpirical and Dynamical YIY CHAOMethods -- Comparison 0.N. WRIGHTend verification.
. Determination of Errors S.J. AUERin LFM Forecasts SurfaceLosw Over the NorthwestAtlantic Ocean,
. A NMethod of Calculating D. a. Raothe Total Flov from A S.D SteinrodGiven Sea Surface B.V. SANCHEZTopography.
5. Compendium of Marine 0.. FEElTMeteorological andOceanographic Productsof the ocean ProductsCenter.
6. A Comparison of the LFR, S.J. AUERSpectral, and ECMWFNumerical Model Forecastsof Dampening OceanicCyclones During One CoolSeason.
7 Development of open Fog L. BUJRROUHSForecasting Regions.
S. A Technique of Deducing T.W. YuWind Direction fromAltimeter Wind SpeedMesuroenta.
. A 5-Year Climatological S. 3. AUERSurvey of the Gulf Streamand Its Associated RingMovesents.
.0. Forecasting Wave Con- Y. Y. CHAOditions Affected bycurrents and BottomTopography.
1. The Editing and D.C. ESTEVAAveraging of AltimeterWayve and Wind Data.
2. Forecasting Super-structure Icing for
Alaskan Waters.
3. Tidal Estimation in theAtlantic and IndianOceans.
Performance of Tech-niques Used to DeriveOcean Surface winds.
.5. PerformanCe Statisticsof Techniques Used toDetermine ocean SurfaceWinds.
24. Synoptic Surtace NMarine V. GERALDData Monitoring.
TECH. NOTEGI.ERL CON.4471
10/87
7/86
OFF. "OE 313 7/86
NASA TECH.DO 87799
25. Estimating and Removing L. C. BREAKERSensor Induce Correlationfrom AVKR Data.
26. Infinite Elements for H.S. ChenWater Wave RAdiation andscattering.
27. A Statietical Comparison W.N. GEMILLof MthIods for Determining T.W. YUocean surface Wind. D.M. F71T
28. A Reviewv of the Program
Product Dev. of the OPC.4/87
mNRA TECH KmtO 9/86
OFF.NOTE 312TECH NOTE
OFF.NOTE 323
29. Infinite Elements forCombined Diffraction ndRefraction.
30 An Operational SpectralWave Forecasting Modelfor the Gulf of exico.8/86
31. Improving Global Wev-Forecasts IncorporatingAltimeter Data.
2/87
MON.WEA.REV. 9/87
3. GEO. RES. 10/87
TECh. NOTE
TECH. NOTE
0. 8. FElT NWA DIGEST
B.V. SANCHEZD. . RAOS, D. STEINROD
W H GEKRILLT.W. YUD.. FEIT
W.H. GEMEILLT.W. YUD .. FElT
6. Determining Equivalent T.W. YUDepths of the AtmosphericBoundary Layer Over theOcean.
L7. Analysis of the Ateos- T.W. YUpheric Mixed LayerReighte Over cthe Oceans.
la. An Operational Forecast D.8. FEETSystem for SuperstructureIcing.
19g. Evaluation of Several 0. ESTEVAExperimental AssimilatingSignificant Wave HeightEstimte into SpectralWave Models.
20 Evaluation of WavYe .Y. CHAOForecast for the Gulfof Mexico.
21 El Mino and Related L.C. BREAKERVariability in Sea SurfaceTemperature Along Central
All analysis and forecast fields verifying with the current
00z and 12z ship data are extracted from an 8-day circular file.
For each report a value of the gridded field at the observed
position(latitude,longitude) is generated by quadratic
interpolation. Table III depicts the unified marine verification
database 164 indexed array/record format.
The daily match-up of the observed data and the model outputs
are written to a 17-day circular file called, NWS.WD21.OPC.UNF-
DATA.CYC00. Approximately 1800 records are processed daily. Each
record is packed and blocked with format control. At the end of a
15-day cycle the dataset is transferred from disk to tape.
B. Statistical Evaluations
The boundary layer wind model is verified against fixed buoy
data. Statistics of bias and root mean square(RMS) error are used
to evaluate the analyses and forecasts. Figure 1 shows the 24hr
forecast RMS and bias errors in meters/second for the OPC and FNOC
boundary layer winds for June 1989 - January 1990. Figure 2
displays OPC wind analysis and forecast errors of bias and RMS in
meters/second for Sept 1989 - Jan 1990.
The OPC wave model is verified against 14 offshore deep water
3
fixed buoys. The evaluation of the OPC wave model performance is
based upon statistics of bias(m), RMS(m) error, and correlation
coefficient. Figure 3 shows the statistical comparison between the
OPC and GSOWM wave models.
Figure 4 depicts statistical verification of air and sea
surface temperature analyses, air/sea temperature differences, and
mean sea level pressure with fixed buoy data.
SUMMARY
The development of the unified marine verification database
system allows statistical evaluation and comparison of selected
operational marine products in a timely fashion. These performance
statistics(RMS error, bias, and correlation coefficient) are
presented and discussed each month during the OPC products
performance review.
ACKNOWLEDGEMENT
The author would like to thank Dr. D. B. Rao, Mr. W. Gemmill,
and Mr. D. Feit for their suggestions and guidance during the
writing of this office note. Thanks to Susan Hubbard for the
typing.
4
Table I: Parameters saved for verification from models.
ANALYS FCST(12 24 36 48 60 72)
OPC Wind Speed XWind Dir XWave Hgt XPeriod Prim XPeriod of Sec XWave Dir XFog/Vis XBlended SST XSatellite SST X
NMC RGL Bdyu XBdyv X1000mb rh X1000mb T X1000mb u X1000mb v XMSLP X
NMC AVA Bdyu XBdyv X1000mb rh X1000mb T X1000mb u X1000mb v XMSLP X
FNOC SST XBdyu XBdyv XWave Hgt XPrd Prim XPrd Sec XWave Dir X
xxx xx x xxx xx x xxx xx x xxx xx x xxx xx x x x x x x x
x x
xxx xxxx xxxx xxxx xxxx xxxx xxxx x
xx xxxxx xxxxx xxxxx xxxxx xxxxx xxxxXxx x
x xx xx xx xx xx xx xx xx xx xx xx x
xxxxxx
5
Table II: Measurements of verification parameters (and units).
Mean Sea Level PressureWind DirectionWind speedAir TempDew Point DepSea Surface TempPresent WeatherPast WeatherHorizontal VisibilityPeriod of WaveHeight of WavePeriod of SwellHeight of SwellDirection of Swell
* World Meteorological Organization(WMO) coded Standard
6
Table III: The unified marine database record format.
Record(1)"i 2*. 3
4
" 5" 6
" 7
" 8"i 9
" 10" 11
" 12" 13" 14" 15
" 16" 17" 18
" 19" 20" 21" 22" 23" 24" 25
26" 27" 28" 29" 30" 31" 32
"H 33" 34
" 35" - 36" 37
" 38.. 39
" 40" 41
42" 43" 44i" 45
" 46
Report TypeYYMMDDHHLatitudeLongitudeMean Sea Level PressureWind Direction(deg)Wind Speed(s)Air Temperature(tenth deg C)Dew Point Depression(tenth deg C)Sea Surface Temperature(tenth deg C)Present WeatherPast WeatherVisibilityPeriod of the Wave(s)Wave Height(1/2 yd)Period of the Swell(s)Height of the Swell(1/2 yd)Direction of the SwellBlended Sea Surface Temp(tenth deg C)-999-999-999-999-999-999-999-999Bdy Wind Direction (00hr) RGLi" " Speed t" "
1000mb Rh " "" Temperature " "
" Wind Direction "- "" i" Speed " "MSLP " "
Bdy Wind Direction (00hr) AVA" it Sne-ed to if
-U ---
1000mb Rh " "" Temperature i" "i
" Wind Direction " "i" " Speed I" "MSLP "
Bdy Wind Direction (00hr)" -" Speed "i
Hgt of Wave "Prd Pri Wave "
NVYI.
I.
I,
7
" Sec " I "Way Dir " "-999Wnd Spd (OOhr)" Direction " "
Hgt of Wave " "iDir " " " "
Prd " "-999-999-999-999-999-999-999,-999-999Bdy Wind Direction (24hr)