ECMWF Joint OSSE Nature Runs Data Description

Nature Run is a free forecast run with daily SST and ice. Model used is Version c31r1 (id=128), which is similar model used for interim reanalysis at ECMWF (c31r2). The reason for using a free forecast run is explained at: http://www.emc.ncep.noaa.gov/research/osse/NR/record/TWS.OSSE_truth.html

T511NR (13 month long nature run to study data impact on large scale events)

Horizontal resolution: T511
Number of vertical levels: 91
Period covers 20050510-20060531 (3-hour write ups)
Completed: July 17, 2006

T799Oct05 (hurricane period)

Horizontal resolution: T799
Number of vertical levels: 91
Hourly write ups

September 27- November 1st

T799Apr06 (season for mid-latitude severe storms)

Horizontal resolution: T799
Number of vertical levels: 91
Hourly write ups

Initial conditions from the T511NR

Period: April 10-May 15th

[Format]

Grib1

Decoder is available at

http://www.ecmwf.int/products/data/software/download/gribex.html

[Variables, levels and resolution]

Model level data:

Reduced Gaussian grid used for model

N256 for T511NR (1024 grid point around the equator)

N400 for T799NR (1600 grid point around the equator)

91-level data:

Uhbl 131 U velocity [m s**-1]

Vhbl 132 V velocity [m s**-1]

VOhbl 138 Vorticity (relative) [s**-1]

Whbl 135 Vertical velocity [Pa s**-1]

Thbl 130 Temperature [K]

O3hbl 203 Ozone mass mixing ratio [kg kg**-1]

CChbl 248 Cloud cover [(0 - 1)]

CIWChbl 247 Cloud ice water content [kg kg**-1]

CLWChbl 246 Cloud liquid water content [kg kg**-1]

Dhbl 155 Divergence [s**-1]

Qhbl 133 Specific humidity [kg kg**-1]

no100hbl 100 Geopotential height

One level data:

LNSPhlev1 152 hybrid level 1 Logarithm of surface pressure

Zhlev1 129 hybrid level 1 Geopotential [m**2 s**-2]

Surface data:

Reduced Gaussian grid used for model.

N256 for T511NR (1024 grid point around the equator)

N400 for T799NR (1600 grid point around the equator)

no10Usfc 165 10 metre U wind component [m s**-1]

no10Vsfc 166 10 metre V wind component [m s**-1]

no2Dsfc 168 2 metre dewpoint temperature [K]

no2Tsfc 167 2 metre temperature [K]

ASNsfc 32 Snow albedo [(0-1)]

BLDsfc 145 Boundary layer dissipation [W m**-2 s]

BLHsfc 159 Boundary layer height [m]

CAPEsfc 59 Convective available potential energy [J kg**-1]

CHNKsfc 148 Charnock

CIsfc 31 Sea-ice cover [(0-1)]

CPsfc 143 Convective precipitation [m]

Esfc 182 Evaporation [m of water]

ESsfc 44 Snow evaporation [m of water]

EWSSsfc 180 East/West surface stress [N m**-2 s]

FALsfc 243 Forecast albedo [(0 - 1)]

FLSRsfc 245 Forecast log of surface roughness for heat

FSRsfc 244 Forecast surface roughness [m]

GWDsfc 197 Gravity wave dissipation [W m**-2 s]

HCCsfc 188 High cloud cover [(0 - 1)]

LCCsfc 186 Low cloud cover [(0 - 1)]

LGWSsfc 195 Lat. component of gravity wave stress [N m**-2 s]

LSMsfc 172 Land/sea mask [(0, 1)]

LSPsfc 142 Stratiform precipitation [m]

LSPFsfc 50 Large-scale precipitation fraction [s]

MCCsfc 187 Medium cloud cover [(0 - 1)]

MGWSsfc 196 Meridional component of gravity wave stress [N m**-2 s]

MSLsfc 151 Mean sea-level pressure [Pa]

NSSSsfc 181 North/South surface stress [N m**-2 s]

PARsfc 58 Photosynthetically active radiation at the surface [W m**-2]

ROsfc 205 Runoff [m]

RSNsfc 33 Snow density [kg m**-3]

SDsfc 141 Snow depth [m of water equivalent]

SFsfc 144 Snowfall (convective + stratiform) [m of water equivalent]

SKTsfc 235 Skin temperature [K]

SLHFsfc 147 Surface latent heat flux [W m**-2 s]

SMLTsfc 45 Snowmelt [m of water]

SRCsfc 198 Skin reservoir content [m of water]

SSHFsfc 146 Surface sensible heat flux [W m**-2 s]

SSRsfc 176 Surface solar radiation [W m**-2 s]

SSRCsfc 210 Surface net solar radiation, clear sky [W m**-2]

SSRDsfc 169 Surface solar radiation downwards [W m**-2 s]

SSTKsfc 34 Sea surface temperature [K]

STRsfc 177 Surface thermal radiation [W m**-2 s]

STRCsfc 211 Surface net thermal radiation, clear sky [W m**-2]

STRDsfc 175 Surface thermal radiation downwards [W m**-2 s]

SUNDsfc 189 Sunshine duration [s]

TCCsfc 164 Total cloud cover [(0 - 1)]

TCO3sfc 206 Total column ozone [Dobson]

TCWsfc 136 Total column water [kg m**-2]

TCWVsfc 137 Total column water vapour [kg m**-2]

TSNsfc 238 Temperature of snow layer [K]

TSRsfc 178 Top solar radiation [W m**-2 s]

TSRCsfc 208 Top net solar radiation, clear sky [W m**-2]

TTRsfc 179 Top thermal radiation [W m**-2 s]

TTRCsfc 209 Top net thermal radiation, clear sky [W m**-2]

UVBsfc 57 Downward UV radiation at the surface (Ultra-violet band B) [W m**-2]

Zsfc 129 Geopotential [m**2 s**-2]

var78sfc 78 Total column liquid water [kg m**-2]undefined

var79sfc 79 Total column ice water [kg m**-2]undefined

STL10_7cm 139 0-7 cm underground Soil temperature level 1 [K]

STL27_28cm 170 7-28 cm underground Soil temperature level 2 [K]

STL328_100cm 183 28-100 cm underground Soil temperature level 3 [K]

STL4100_255cm 236 100-255 cm underground Soil temperature level 4 [K]

SWVL10_7cm 39 0-7 cm underground Volumetric soil water layer 1 [m**3 m**-3]

SWVL27_28cm 40 7-28 cm underground Volumetric soil water layer 2 [m**3 m**-3]

SWVL328_100cm 41 28-100 cm underground Volumetric soil water layer 3 [m**3 m**-3]

SWVL4100_255cm 42 100-255 cm underground Volumetric soil water layer 4 [m**3 m**-3]

ISTL10_7cm 35 0-7 cm underground Ice surface temperature layer 1 [K]

ISTL27_28cm 36 7-28 cm underground Ice surface temperature layer 2 [K]

ISTL328_100cm 37 28-100 cm underground Ice surface temperature layer 3 [K]

ISTL4100_255cm 38 100-255 cm underground Ice surface temperature layer 4 [K]

Verification data are provided for pressure levels.

Regular lat lon on a 1deg x 1deg for T511 NR

Regular lat lon on a 0.5deg x 0.5deg for T799 NR

31 Pressure levels:

1000 975 950 925 900 850 800 775 750 700 650 600 550 500 450 400 350 300 250 200 150 100 70 50 30 20 10 7 5 3 2 1

Variables
CCprs 248 Cloud cover [(0 - 1)]

CIWCprs 247 Cloud ice water content [kg kg**-1]

CLWCprs 246 Cloud liquid water content [kg kg**-1]

Dprs 155 Divergence [s**-1]

O3prs 203 Ozone mass mixing ratio [kg kg**-1]

Qprs 133 Specific humidity [kg kg**-1]

Rprs 157 Relative humidity [%]

Tprs 130 Temperature [K]

Uprs 131 U velocity [m s**-1]

Vprs 132 V velocity [m s**-1]

VOprs 138 Vorticity (relative) [s**-1]

Wprs 135 Vertical velocity [Pa s**-1]

Zprs 129 Geopotential [m**2 s**-2]

Verification data on isentropic levels.

Regular lat lon on a 1deg x 1deg for T511 NR

Regular lat lon on a 0.5deg x 0.5deg for T799 NR

Five potential temperature levels: 315,330,350,370,530

Variables

Dtht 155 Divergence [s**-1]

MONTtht 53 Montgomery potential [m**2 s**-2]

O3tht 203 Ozone mass mixing ratio [kg kg**-1]

PREStht 54 Pressure [Pa]

PVtht 60 Potential vorticity [K m**2 kg**-1 s**-1]

Qtht 133 Specific humidity [kg kg**-1]

Utht 131 U velocity [m s**-1]

Vtht 132 V velocity [m s**-1]

VOtht 138 Vorticity (relative) [s**-1]

Time series of Surface data on a 1deg x 1deg for both T799NR and T511NR.
CP(Convective precipitation), LSP(Large Scale Precipitation) HCC,MCC,LCC, SD SKT, T2m TD2m U10m,V10m, and MSLP

Time series of all surface data on a 0.5 deg x 0.5 deg for T799 NR.

Surface height on a 1deg x 1deg for May 1, 2005 at 12z