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Near-Surface Meteorology Data
The Center for Ocean-Land Atmosphere Studies (COLA) near-surface data set for ISLSCP-II has been derived from the NCEP/DOE AMIP-II reanalysis (http://www.cpc.ncep.noaa.gov/products/wesley/reanalysis2/ [Internet Link], Kanamitsu et al., 2000, 2002) covering the years from 1979-2003. The purpose of the NCEP/DOE Reanalysis is to provide an improved version of the original NCEP/NCAR reanalysis (Kalnay et al. 1996; Kistler et al. 2001) for use by the Atmospheric Model Inter-comparison Project (AMIP) II (Gleckler 1996; http://www-pcmdi.llnl.gov/projects/amip/index.php [Internet Link]) for GCM validation. The NCEP/DOE reanalysis uses a very similar analysis system to the NCEP/NCAR reanalysis and an upgraded version of the same general circulation model, with known errors fixed and assimilation of a more complete stream of observational data after 1993. Near-surface meteorological state variables and fluxes from the NCEP/DOE reanalysis are of potentially great value to the ISLSCP data user community. To co-register the NCEP/DOE reanalysis on the ISLSCP 1° grid, the reanalysis data set was regridded from its native T62 Gaussian grid) resolution (192 x 94 grid boxes globally) to 1° ISLSCP-II required resolution.
The fields that are used for ISLSCP-II are near surface meteorological fields, fluxes of heat, moisture and momentum at the surface, and land surface state variables. There are five temporal categories of data; time invariant and monthly mean annual cycle fields (together referred to as "fixed" fields); monthly mean fields; monthly-3-hourly (mean diurnal cycle) fields, and 3-hourly fields. Two types of variables exist in this data; instantaneous fields (primarily state variables), and average fields (primarily flux fields expressed as a rate).
Data Provider: Paul Dirmeyer, Mei Zhao, Glenn White, Wesley Ebisuzaki
 Data Files (stored at the Goddad DAAC) |
 Data Set Documentation |
 Image Viewing Tutorial |
The files have been compressed using the PKZip program. Each uncompressed file contains space-delimited ASCII text with 360 values per line and 180 lines of data (1 degree resolution). Each line is terminated by a newline character. The data are structured so that the upperleft corner of the first pixel is located at 90 North latitude and 180 West longitude. Each pixel represents a 1 by 1 degree area.
| File Abbrev. | Type of Data | Temporal Coverage |
|---|---|---|
| cpr | Convective precipitation rate | 3-hourly |
| dlw | Surface downward long wave radiation | diurnal, 3-hourly |
| dsw | Surface downward short wave radiation | diurnal, 3-hourly |
| falbedo | Snow-free surface albedo (climatological monthly mean annual cycle) including effects of permanent ice. | fixed |
| forogrd | Orographic height above MSL | fixed |
| fresis | Plant resistance function | fixed |
| frough | Surface roughness length for momentum and heat (climatological monthly mean annual cycle) | fixed |
| imask | Data mapping mask | fixed |
| lh | Surface latent heat flux | diurnal |
| prec | Total precipitation rate | diurnal, 3-hourly |
| pres | Surface pressure | diurnal |
| roff | Surface runoff | diurnal |
| sh | Surface sensible heat flux | diurnal |
| snc | Fraction of snow cover | monthly |
| snd | Snow cover in terms of water equivalent depth (mass per unit area) | monthly, 3-hourly |
| snlw | Surface net long wave radiation | diurnal, 3-hourly |
| snr | Snowfall rate | diurnal, 3-hourly |
| snsw | Surface net short wave radiation | diurnal, 3-hourly |
| spfh | Specific humidity at 2 m AGL | diurnal, 3-hourly |
| sw10 | Surface layer (0-10 cm) volumetric soil moisture | monthly |
| sw200 | Subsurface layer (10-200 cm) volumetric soil moisture | monthly |
| t10 | Surface layer (0-10 cm) soil temperature | monthly |
| t200 | Subsurface layer (10-200 cm) soil temperature | monthly |
| tmax | Maximum of temperature at 2 m | diurnal |
| tmin | Minimum of temperature at 2 m AGL | diurnal |
| tmp | Temperature at 2 m AGL | diurnal, 3-hourly |
| tnlw | TOA outgoing long wave radiation | diurnal |
| tnsw | TOA net shortwave radiation | diurnal |
| u10 | Zonal component of wind at 10 m AGL | diurnal |
| ustr | Zonal wind stress | diurnal |
| v10 | Meridional component of wind at 10 m AGL | diurnal |
| vstr | Meridional wind stress | diurnal |
| w10 | Wind speed at 10 m AGL | 3-hourly |
Related Pages:
ISLSCP Initiative II Home
General Data Overview
Near-Surface Met Data Overview
NCEP II Reanalysis Meteorology Data
Revision Date: July 2, 2004