ISLSCP II ECMWF Near-Surface Meteorology Parameters There are 289 compressed data files with this data set. The files include data with fixed, monthly, monthly-6-hourly, and 3- hourly temporal resolutions. ***REFER TO THE COMPANION FILE ecmwf_data_files.pdf FOR INFORMATION REGARDING THE NUMBER OF FILES PER YEAR File Name Convention -------------------- The files include data with fixed, monthly, monthly-6-hourly, 6-hourly, and 3-hourly temporal resolutions. There are 289 compressed data files. When extrapolated, all files are named using the following general naming convention: E40_XXXaabb_1d_YYYYMMDD_HH.asc: E40: Stands for ECMWF Re-Analysis (ERA40). XXX: This is the code that identifies the parameter.Some codes have been assigned and/or modified by the ISLSCP II staff. aa: This indicates if the parameter is an average or mean value ("av"), "in" for instantaneous data, "d1" for the first day of the month, or "sd" for standard deviation. This can also be "_fixed" for time invariant fields. bb: This can be "fc" for forecast, or "an" for analysis. 1d: This identifies the spatial resolution of the data-"1d" for 1-degree in both latitude and longitude. YYYY:4-digit year from 1986 to 1995. MM: 2-digit month from 01 to 12. DD: 2-digit day.A value of 00 means that the file is a monthly average. HH: 2-digit hour (GMT) from 03 to 24. Depending on the parameter, this can be the end of the time period or the value At the HH time (e.g. 06 means this is either an average from 03 to 06, or an instantaneous value at 06, denoted by "_av" or "_in" in the filename). NOTE*** A value of 24 is either an average from 21 to 24 or a value at 24 GMT, where 24 is the start of the next day, or hour 00. The hour 00 is not used here. Also note that the hourly time stamps are not provided for monthly data. .asc: This is the file extension, indicating that the file is in the ASCII,or text, format. ****** All data files are organized by temporal frequency first (i.e. fixed, monthly, monthly diurnal, 6- or 3-hourly), then by parameter, and then by time stamp (e.g. year, month, day, and 6- or 3-hourly period). ***NOTE****refer to the data set documentation and companion file 1_ecmwf_met_doc.pdf.for a list of the variables for each group of data Fixed Fields and Boundary Conditions Data file: E40_fixed_1d.tar.gz There are 10 files. The individual data files are named using the following naming convention: E40_XX_fixed_1d_mZZ.asc Where XX is the parameter code ZZ is either 00 for time invariant fields or the month from 01 to 12 for the monthly varying fixed fields. Note that all the fixed field data are year-independent. Monthly Mean Fields (Analyses) Data file:E40_monthly_analysis.tar.gz There are 5,004 data files. The data are for all 10 years.There are subdirectories named E40_variable_1d_monthly. When extrapolated, the files are named using the following naming convention: E40_xxxan_1d_YYYYMM00.asc, Where XXX is the parameter code YYYY is the year from 1986 to 1995 an means these are analyses MM is the month from 01 to 12, and 00 denotes a monthly value. When a particular field contains “av”, “sd”, or “d1” files, these are all included in the same compressed file. Note that not all fields contain all three types of “av”, “sd” and “d1” files. Monthly Mean Fields of Precipitation (Forecasts) Data file: E40_monthly_precip.tar.gz. There are four subdirectories for four variables named E40_variable_1d_monthly. When extrapolated, the files are named using the following naming convention: E40_XXavfc4_1d_YYYYMMDD.asc Where XX is the parameter code fc is for forecasts. These monthly fields contain monthly precipitation averaged over four different forecast ranges, named “fc1” through “fc4". This numbering system is related to the averaging of precipitation over different forecast ranges as seen below: Forecast ranges: 1. fc1: Averaged over forecasts at 0, 6, 12, and 18 UTC with Step=0-6 2. fc2: Averaged over forecasts at 0 and 12 UTC with Step=0-12 3. fc3: Averaged over forecasts at 0 and 12 UTC with Step=0-12 4. fc4: Averaged over forecasts at 0, and 12 UTC with Step=0-12 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. 6-hourly Diurnal Files: 1. E40_10Sav_1d_diurnal6h.tar.gz…(note that this is an “average” file) 2. E40_10Uan_1d_diurnal6h.tar.gz 3. E40_10Van_1d_diurnal6h.tar.gz When extrapolated, the data files under files 1-3 above follow the naming convention: E40_10xxx6an_1d_YYYYMMDD_ZZ.asc Where xxx is Sav, UXX or VXX (wind speed variables) YYYY is 1985-1995 MM is 01-12 DD is 00 in all cases ZZ is 06, 12, 18, and 24 (every 6 hours) 4.E40_2Dan_1d_diurnal6h.tar.gz When extrapolated, the data files for #4 are named E40_2DXX6an_1d_YYYYMMDD_ZZ.asc Where 2Dxx is a code for the dew point variable at 2 m YYYY is 1985-1995 MM is 01-12 DD is 00 in all cases ZZ is 06, 12, 18, and 24 (every 6 hours) 5. E40_2Tan_1d_diurnal6h.tar.gz When extrapolated, the data files for #5 are named E40_2TXX6an_1d_YYYYMMDD_ZZ.asc Where 2Txx is a code for the temperature variable at 2 m. The xx is for av or sd files (average or standard deviation). YYYY is 1985-1995 MM is 01-12 DD is 00 in all cases ZZ is 06, 12, 18, and 24 (every 6 hours) 6. E40_Q57an_1d_diurnal6h.tar.gz 7. E40_Q60an_1d_diurnal6h.tar.gz 8. E40_T57an_1d_diurnal6h.tar.gz 9. E40_T60an_1d_diurnal6h.tar.gz 10. E40_U57an_1d_diurnal6h.tar.gz 11. E40_V57an_1d_diurnal6h.tar.gz 12. E40_V60an_1d_diurnal6h.tar.gz When extrapolated, files within the compressed files 6-12 above follow the naming conventions: E40_Q57xx6an_1d_YYYYMMDD_ZZ.asc E40_Q60xx6an_1d_YYYYMMDD_ZZ.asc E40_T57xx6an_1d_YYYYMMDD_ZZ.asc E40_T60xx6an_1d_YYYYMMDD_ZZ.asc E40_U57xx6an_1d_YYYYMMDD_ZZ.asc E40_V57xx6an_1d_YYYYMMDD_ZZ.asc E40_V60xx6an_1d_YYYYMMDD_ZZ.asc Where Q57xx and Q60xx are for specific humidity at levels 57 and 60,T57xx and T60xx are temperature at level 57 and 60, U57xx is the U-component of wind speed at level 57, V57xx and V60 are the V-component of wind speed at levels 57 and 60.The xx is for av or sd files (average or standard deviation). YYYY is 1985-1995 MM is 01-12 DD is 00 in all cases ZZ is 06, 12, 18, and 24 (every 6 hours) 13. E40_U60an_1d_diurnal6h.tar.gz When extrapolated, files within the compressed file #13 above follow the naming convention: E40_U60XX6an_1d_YYYYMMDD_ZZ.asc Where U60x” is the U-component of wind speed at level 60, and there are av and sd files (average or standard deviation) YYYY is 1985-1995 MM is the month from 01 to 12, DD is 00 ZZ: Note that two types of variables (i.e. ZZ6) exist in the monthly-6-hourly data sets: av6 indicates a monthly average for each 6-hour synoptic time and sd6 indicates the standard deviation in the monthly mean for each 6-hour synoptic time. For all these analyses fields, all monthly averages are calculated from values EXACTLY AT the HH time stamp (i.e. instantaneous values). 14. E40_LNPan_1d_diurnal6h.tar.gz When extrapolated, files within the compressed file #14 above follow the naming convention: E40_LNPav6an_1d_YYYYMMDD_ZZ.asc Where LNP is the surface pressure variable, av files only—there are no standard deviation data files. YYYY is 1985-1995 MM is the month from 01 to 12 DD is 01-31 ZZ: Note that two types of variables (i.e. ZZ6) exist in the monthly-6-hourly data sets: av6 indicates a monthly average for each 6-hour synoptic time and sd6 indicates the standard deviation in the monthly mean for each 6-hour synoptic time. For all these analyses fields, all monthly averages are calculated from values EXACTLY AT the HH time stamp (i.e. instantaneous values). 6-hourly Files: E40_2Dan_1d_6hourly.tar.gz E40_2Tan_1d_6hourly.tar.gz The individual monthly 6-hourly files are named: E40_2X6hran_1d_YYYYMMDD_ZZ.asc Where 2X6hran is either 2Dan or 2Tan MM is the month from 01 to 12, DD is 01-31 ZZ: Note that two types of variables (i.e. ZZ6) exist in the monthly-6-hourly data sets (see av6 and sd6 below): av6 indicates a monthly average for each 6-hour synoptic time sd6 indicates the standard deviation in the monthly mean for each 6-hour synoptic time. *It is critical for users to understand that, using our ISLSCP II naming convention, the monthly 6-hourly data files at 24 UTC are monthly averages of analyses obtained at midnight of every day in the month and are equivalent to monthly averages of analyses at 00 UTC but for the very next day. 3-Hourly (Forecasts) There are 270 compressed 3-hourly files. The data  are for 27 variables for the years 1985-1995, for a total of 270 data files (27 variables x 10 years). Notes: Different variables exist in the 3- hourly data: av means averaged -- the data are averaged over the 3-hour period. av3 indicates a monthly average for each 3-hour synoptic time. sd6 indicates the standard deviation in the monthly mean for each 6-hour synoptic time (***NOTE: Standard deviations are only available at 6-hourly steps***). 3-Hourly Files: 1. E40_CP_1d_3hourly.tar.gz Instantaneous value (“in”) files: 2. E40_2D_1d_3hourly.tar.gz 3. E40_Q57_1d_3hourly.tar.gz 4. E40_Q60_1d_3hourly.tar.gz 5. E40_T57_1d_3hourly.tar.gz 6. E40_U60_1d_3hourly.tar.gz 7. E40_T60_1d_3hourly.tar.gz 8. E40_V57_1d_3hourly.tar.gz 9. E40_2T_1d_3hourly.tar.gz 10. E40_SKT_1d_3hourly.tar.gz 11. E40_EWSS_1d_3hourly.tar.gz 12. E40_NSSS_1d_3hourly.tar.gz 13. E40_RO_1d_3hourly.tar.gz 14. E40_SLHF_1d_3hourly.tar.gz 15. E40_SSHF_1d_3hourly.tar.gz 16. E40_SSRD_1d_3hourly.tar.gz 17. E40_STRD_1d_3hourly.tar.gz: Note..there are no data files for the years 1987,1989,1991,1994, or 1995. The earliest data are for 1986/04/01, and the latest data are for 1993/12/31. 18. E40_LSP_1d_3hourly_YYYY.tar.gz 19. E40_SP_1d_3hourly_YYYY.tar.gz 20. E40_SSR_1d_3hourly_YYYY.tar.gz 21. E40_STR_1d_3hourly_YYYY.tar.gz 22. E40_SSRD_1d_3hourly_YYYY.tar.gz 23. E40_E_1d_3hourly_YYYY.tar.gz 24. E40_10U_1d_3hourly_YYYY.tar.gz 25. E40_10V_1d_3hourly_YYYY.tar.gz 26. E40_U57_1d_3hourly_YYYY.tar.gz 27. E40_SF_1d_YYYY_3hourly.tar.gz