Abstract:
This data set contains a series of land surface parameters simulated from the Noah land-surface model (LSM) for Phase 2 of the North American Land Data Assimilation System (NLDAS-2). The data are in 1/8th degree grid spacing and range from Jan 1979 to the present. The temporal resolution is monthly. The file format is WMO GRIB-1. The NLDAS-2 monthly Noah model data were generated from the NLDAS-2 ... hourly Noah model data, as monthly accumulation for rainfall, snowfall, subsurface runoff, surface runoff, total evapotranspiration, and snow melt, and monthly average for other variables. Monthly period of each month is from 00Z at start of the month to 23:59Z at end of the month, except the first month (Jan. 1979) that starts from 00Z 02 Jan 1979. Also for the first month ( Jan 1979), because the variables listed as instantaneous in the README file (http://hydro1.sci.gsfc.nasa.gov/data/s4pa/NLDAS/README.NLDAS2.pdf) do not have valid data exactly on 00Z 02 Jan 1979, and this one hour is not included in the average for this month only.
Details about the NLDAS-2 configuration of the Noah LSM can be found in Xia et al. (2012).
The NLDAS-2 Noah monthly data contain fifty-two fields. The data set applies a user-defined parameter table to indicate the contents and parameter number. The following table shows a list of parameters, their Product Definition Section (PDS) IDs and units.
PDS_IDs:Short_Name:Full_Name [Unit] 179:ACONDsfc:Aerodynamic conductance [m/s] 84:ALBDOsfc:Albedo [%] 162:ARAINsfc:Rainfall (unfrozen precipitation) [kg/m^2] 161:ASNOWsfc:Snowfall (frozen precipitation) [kg/m^2] 148:AVSFTsfc:Average surface skin temperature [K] 234:BGRUNsfc:Subsurface runoff (baseflow) [kg/m^2] 181:CCONDsfc:Canopy conductance [m/s] 223:CNWATsfc:Plant canopy surface water [kg/m^2] 205:DLWRFsfc:Longwave radiation flux downwards (surface) [W/m^2] 204:DSWRFsfc:Shortwave radiation flux downwards (surface) [W/m^2] 199:EVBSsfc:Direct evaporation from bare soil [W/m^2] 200:EVCWsfc:Canopy water evaporation [W/m^2] 57:EVPsfc:Total evapotranspiration [kg/m^2] 155:GFLUXsfc:Ground heat flux [W/m^2] 182:LAIsfc:Leaf area index (0-9) [unitless] 121:LHTFLsfc:Latent heat flux [W/m^2] 151:LSOIL0_10cm:0-10 cm liquid soil moisture content (non-frozen) [kg/m^2] 151:LSOIL10_40cm:10-40 cm liquid soil moisture content (non-frozen) [kg/m^2] 151:LSOIL40_100cm:40-100 cm liquid soil moisture content (non-frozen) [kg/m^2] 151:LSOIL100_200cm:100-200 cm liquid soil moisture content (non-frozen) [kg/m^2] 207:MSTAV0_100cm:0-100 cm Moisture availability [%] 207:MSTAV0_200cm:0-200 cm total column Moisture availability [%] 112:NLWRSsfc:Longwave radiation flux net (surface) [W/m^2] 111:NSWRSsfc:Shortwave radiation flux net (surface) [W/m^2] 145:PEVPRsfc:Potential evaporation rate [W/m^2] 248:RCQsfc:Humidity parameter in canopy conductance [fraction] 246:RCSsfc:Solar parameter in canopy conductance [fraction] 249:RCSOLsfc:Soil moisture parameter in canopy conductance [fraction] 247:RCTsfc:Temperature parameter in canopy conductance [fraction] 255:RSMACRsfc:Relative soil moisture availability control factor [0-1] 203:RSMINsfc:Minimal stomatal resistance [s/m] 250:RZSMgnd:Root zone soil moisture [kg/m^2] 198:SBSNOsfc:Sublimation (evaporation from snow) [W/m^2] 122:SHTFLsfc:Sensible heat flux [W/m^2] 66:SNODsfc:Snow depth [m] 229:SNOHFsfc:Snow phase-change heat flux [W/m^2] 99:SNOMsfc:Snow melt [kg/m^2] 238:SNOWCsfc:Snow cover [fraction] 86:SOILM0_10cm:0-10 cm layer 1 Soil moisture content [kg/m^2] 86:SOILM0_100cm:0-100 cm top 1 meter Soil moisture content [kg/m^2] 86:SOILM0_200cm:0-200 cm total column Soil moisture content [kg/m^2] 86:SOILM10_40cm:10-40 cm layer 2 Soil moisture content [kg/m^2] 86:SOILM40_100cm:40-100 cm layer 3 Soil moisture content [kg/m^2] 86:SOILM100_200cm:100-200 cm layer 4 Soil moisture content [kg/m^2] 235:SSRUNsfc:Surface runoff (non-infiltrating) [kg/m^2] 210:TRANSsfc:Transpiration [W/m^2] 85:TSOIL0_10cm:0-10 cm Soil temperature [K] 85:TSOIL10_40cm:10-40 cm Soil temperature [K] 85:TSOIL40_100cm:40-100 cm Soil temperature [K] 85:TSOIL100_200cm:100-200 cm Soil temperature [K] 87:VEGsfc:Vegetation [fraction] 65:WEASDsfc:Accumulated snow water-equivalent [kg/m^2]
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Publications/References
Xia, Y., K. Mitchell, M. Ek, J. Sheffield, B. Cosgrove, E. Wood, L. Luo, C. Alonge, H. Wei, J. Meng, B. Livneh, D. Lettenmaier, V. Koren, Q. Duan, K. Mo, Y. Fan, and D. Mocko, (2012), Continental-scale water and energy flux analysis and validation for the North American Land Data Assimilation System project phase 2 (NLDAS-2): 1. Intercomparison and application of model products, J. Geophys. Res., ... 117, D03109, doi:10.1029/2011JD016048.
Betts, A., F. Chen, K. Mitchell, and Z. Janjic (1997), Assessment of the land surface and boundary layer models in two operational versions of the NCEP Eta model using FIFE data, Mon. Weather Rev., 125, 2896-2916, doi:10.1175/1520-0493(1997)125<2896:AOTLSA>2.0.CO;2.
Chen, F., Z. Janjic, and K. Mitchell (1997), Impact of atmospheric surface-layer parameterizations in the new land-surface scheme of the NCEP mesoscale Eta model, Boundary Layer Meteorol., 85, 391-421, doi:10.1023/A:1000531001463.
Ek, M. B., K. E. Mitchell, Y. Lin, E. Rodgers, P. Grunman, V. Koren, G. Gayno, and J. D. Tarpley (2003), Implementation of Noah land surface model advances in the National Centers for Environmental Prediction operational mesoscale Eta model, J. Geophys. Res., 108(D22), 8851, doi:10.1029/2002JD003296.
Koren, V., J. Schaake, K. E. Mitchell, Q. Duan, F. Chen, and J. Baker (1999), A paramerization of snowpack and frozen ground intended for NCEP weather and climate models, J. Geophys. Res., 104, 19569-19585, doi:10.1029/1999JD900232.
Livneh, B., Y. Xia, M. B. Ek, K. E. Mitchell, and D. Lettenmaier (2010), Noah LSM snow model diagnostics and enhancements, J. Hydrometeorol., 11, 721-738, doi:10.1175/2009JHM1174.1.
Wei, H., Y. Xia, K. E. Mitchell, and M. B. Ek (2011), Improvement of Noah land surface model for warm season processes: Evaluation of water and energy flux simulation, Hydrol. Processes, doi:10.1002/hyp.9214.
