This data set for the ISLSCP Initiative II data collection provides meteorology data with fixed, monthly, monthly-6-hourly, 6-hourly, and 3-hourly temporal resolutions. The data were derived from the European Centre for Medium-range Weather Forecasts (ECMWF) near-surface meteorology data set, 40-year re-analysis, or ERA-40 (Simmons and Gibson, 2000), which covers the years 1957 to 2001. The data were processed onto the ISLSCP II Earth grid with a spatial resolution of 1-degree in both latitude and longitude, and span the common ISLSCP II period from 1986 to 1995.
The ECMWF forecast system is called the Integrated Forecasting System (IFS) and was developed in co-operation with Meteo-France. For ERA40 it is used with 60 levels from the top of the model at 10 Pa to the lowest level at about 10 m above the surface.
There are 289 compressed (.tar.gz) data files with this data set.
This data set is one of the products of the International Satellite Land-Surface Climatology Project, Initiative II (ISLSCP II) data collection which contains 50 global time series data sets for the ten-year period 1986 to 1995. A complete description of the data, it's derivation, acknowledgements, and references provided by the ISLSCP II Data Management Staff is included with this data set as a companion file named 1_ecmwf_met_doc.pdf.
ISLSCP II is a consistent collection of data sets that were compiled from existing data sources and algorithms, and were designed to satisfy the needs of modelers and investigators of the global carbon, water and energy cycle. The data were acquired from a number of U.S. and international agencies, universities, and institutions. The data and documentation have undergone two peer reviews.
ISLSCP is one of several projects of Global Energy and Water Cycle Experiment (GEWEX) [http://www.gewex.org/] and has the lead role in addressing land-atmosphere interactions -- process modeling, data retrieval algorithms, field experiment design and execution, and the development of global data sets.
Cite this data set as follows:
Beljaars, A.C.M, A.K. Betts, and E. Brown de Colstoun. 2014. ISLSCP II ECMWF Near-Surface Meteorology Parameters. In Hall, Forrest G., G. Collatz, B. Meeson, S. Los, E. Brown de Colstoun, and D. Landis (eds.). ISLSCP Initiative II Collection. Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/1222
The archived data sets for ISLSCP II have been organized by categories. This data set is in the Near-Surface Meteorology category.
Data Set Spatial Extent: Global
Westernmost Longitude: -180 W
Easternmost Longitude: 180 E
Northernmost Latitude: 90 N
Southernmost Latitude: -90 S
Data Set Spatial Resolution: one degree in both latitude and longitude
Data File Format
There are 289 compressed data files (.tar.gz) with this data set. 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. The files are in standard arc/info ascii grid format.
Table 1. Compressed file names and descriptions
|Compressed File Names||Number of Files in Compressed File||Description|
|FIXED-FIELDS DATA FILES-There are 21 *.asc files for the years 1986-1995|
||21||Data are year-independent for 10
When extrapolated, the files are named
E40_variable_fixed_1d_m00.asc. The variables include:
Albedo background (AL)
High vegetation fraction (CVH)
Low vegetation fraction (CVL)
Land/water mask (LMS)
Logarithm of surface roughness length for heat (LSRH)
Surface roughness length for momentum (SR)
Low vegetation dominant type (TVL)
High vegetation dominant type (TVH)
Geopotential of model surface (Orography * g) (Z)
|MONTHLY MEAN DATA FILES|
Analysis files ("an" in file names
variables, for the years 1986-1995.
There are 15 subdirectories, one for each variable.
The subdirectories are named E40_variable_1d_monthly.
The variables include:|
Snow depth (SD)
Snow albedo (ASN)
Snow temperature (TSN)
Snow density (RSN)
Soil Moisture Layer 1 (SWL1)
Soil Moisture Layer 1 (SWL2)
Soil Moisture Layer 1 (SWL3)
Soil Moisture Layer 1 (SWL4)
Soil Temperature Layer 1 + Sea Surface Temperature (SST) over Ocean (STL1)
Soil Temperature Layer 2 + SST (STL2)
Soil Temperature Layer 3 + SST (STL3)
Soil Temperature Layer 3 + SST(STL4)
Sea Ice Fraction (CI)
Soil Moisture Availability Index (Root Zone) (SMIR)
Soil Moisture Availability Index (Bare Soil) (SMIB)
Monthly precipitation averaged over four different forecast ranges, indicated by fc1 through fc4 in the file names
for four variables.
There are four subdirectories for the four variables named E40_variable_1d_monthly.|
The variables are
Convective Precipitation Rate (CP)
Large Scale Precipitation Rate (LSP)
Total Precipitation Rate (TOTP)
Snow Fall Rate (SF)
|6-HOURLY DIURNAL FILES-The first file listed contains averaged data files (av in file names) file; all other files are analyses (an) files. There are a total of 12,350 files for 13 variables for the years 1985-1995.|
|E40_10Sav_1d_diurnal6h.tar.gz||480||Average (av) files for horizontal wind speed at 10 m|
|E40_10Uan_1d_diurnal6h.tar.gz||926||U-component of wind speed at 10 m|
|E40_10Van_1d_diurnal6h.tar.gz||960||V-component of wind speed at 10 m|
|E40_2Dan_1d_diurnal6h.tar.gz||960||Dew point at 2 m level|
|E40_2Tan_1d_diurnal6h.tar.gz||960||Temperature at 2 m level|
|E40_Q57an_1d_diurnal6h.tar.gz||960||Specific humidity at level 57|
|E40_Q60an_1d_diurnal6h.tar.gz||960||Specific humidity at level 60|
|E40_T57an_1d_diurnal6h.tar.gz||960||Temperature at level 57|
|E40_T60an_1d_diurnal6h.tar.gz||960||Temperature at level 60|
|E40_U57an_1d_diurnal6h.tar.gz||960||U-component of wind speed at level 57|
|E40_U60an_1d_diurnal6h.tar.gz||864||U-component of wind speed at level 60|
|E40_V57an_1d_diurnal6h.tar.gzv||960||V-component of wind speed at level 57|
|E40_V60an_1d_diurnal6h.tar.gz||960||V-component of wind speed at level 60|
|6-HOURLY FILES- Analyses data (an) in file names). The data are for the years 1985-1995|
|E40_2Dan_1d_6hourly.tar.gz||14,608||Dew point at 2 m level|
|E40_2Tan_1d_6hourly.tar.gz||14,608||Temperature at 2 m level|
|3-HOURLY FILES (Forecasts)- The data are for 27 variables for the years 1985-1995, for a total of 270 data files (27 variables x 10 years).|
|E40_CP_1d_3hourly_YYYY.tar.gz||29,216||Convective Precipitation Rate|
|E40_2D_1d_3hourly_YYYY.tar.gz||29,216||Dew point at 2 m level|
|E40_2T_1d_3hourly_YYYY.tar.gz||29,216||Temperature at 2 m level|
|E40_Q57_1d_3hourly_YYYY.tar.gz||29,216||Specific humidity at level 57|
|E40_Q60_1d_3hourly_YYYY.tar.gz||29,216||Specific humidity at level 60|
|E40_SLHF_1d_3hourly_YYYY.tar.gz||29,216||Surface latent heat flux|
|E40_SSHF_1d_3hourly_YYYY.tar.gz||29,216||Surface sensible heat flux|
|E40_STRD_1d_3hourly_YYYY.tar.gz||29,216||Surface LW downward|
|E40_T57_1d_3hourly_YYYY.tar.gz||29,216||Temperature at level 57|
|E40_U57_1d_3hourly_YYYY.tar.gz||29,216||U-component of wind speed at level 60|
|E40_U60_1d_3hourly_YYYY.tar.gz||29,216||U-component of wind speed at level 60|
|E40_T60_1d_3hourly_YYYY.tar.gz||29,216||Temperature at level 60|
|E40_V57_1d_3hourly_YYYY.tar.gz||29,216||V-component of wind speed at level 57|
|E40_V60_1d_3hourly_YYYY.tar.gz||29,216||V-component of wind speed at level 60|
|E40_LSP_1d_3hourly_YYYY.tar.gz||28,976||Large Scale Precipitation Rate|
|E40_10U_1d_3hourly_YYYY.tar.gz||28,968||U-component of wind speed at 10 m|
|E40_10V_1d_3hourly_YYYY.tar.gz||29,216||V-component of wind speed at 10 m|
|E40_SSR_1d_3hourly_YYYY.tar.gz||29,216||Surface net SW radiation|
|E40_STR_1d_3hourly_YYYY.tar.gz||29,216||Surface net LW radiation|
|E40_SSRD_1d_3hourly_YYYY.tar.gz||29,216||Surface SW downward|
|E40_E_1d_3hourly_YYYY.tar.gz||29,216||Surface evaporation rate|
Please refer to the companion files 0_ecmwf_met_readme.txt, ecmwf_data_files.pdf , and 1_ecmwf_met_doc.pdf for additional information on the data file contents and naming conventions.
These data are available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC) [http://daac.ornl.gov].
Telephone: +1 (865) 241-3952
Simmons A.J. and J.K. Gibson, 2000. The ERA-40 Project Plan, ERA-40 Project Report Series No. 1, ECMWF, Reading RG2 9AX, UK., 63pp.