1、NCEP资料（时、日、月）下载及说明路径：ftp:/ftp.cdc.noaa.gov/pub/Datasets/分时资料：ftp:/ftp.cdc.noaa.gov/pub/Datasets/ncep.rean alysis/日平均资料：ftp:/ftp.cdc.noaa.gov/pub/Datasets/ncep.reanalysis.dailyavgs/月平均资料：ftp:/ftp.cdc.noaa.gov/pub/Datasets/ncep.reanalysis.derived/一、分时资料地面分时资料下载路径：ftp:/ftp.cdc.noaa.gov/Datasets/ncep.re
2、analysis/surface/4-times daily，1948 年至今，2.52.5类型 文件名 变量名 单位 文件大小气温 air.sig995.YYYY.nc 4xDaily Air temperature at sigma level 995 degK 29.2MB抬升指数 lftx.sfc.YYYY.nc 4xDaily Surface Lifted Index degK 29.2MB最佳抬升指数 lftx4.sfc.YYYY.nc 4xDaily Best (4-layer) Lifted Index degK 29.2MB上升速度 omega.sig995.YYYY.nc
3、4xDaily omega at surface Pascal/s 29.2MB潜在温度pottmp.sig995.YYYY.nc 4xDaily potential temperature at sigma level 995 degK29.2MB大气可降水 pr_wtr.eatm.YYYY.nc 4xDaily Precipitable Water for entire atmosphere kg/m2 29.2MB本站气压 pres.sfc.YYYY.nc 4xDaily Pressure at surface Pascals 29.2MB相对湿度 rhum.sig995.YYYY.nc
4、 4xDaily relative humidity at sigma level 995 % 29.2MB海平面气压 slp.YYYY.nc 4xDaily Sea Level Pressure Pascals 29.2MB风速（u 分量） uwnd.sig995.YYYY.nc 4xDaily u-wind at sigma level 995 m/s 29.2MB风速（v 分量） vwnd.sig995.YYYY.nc 4xDaily v-wind at sigma level 995 m/s 29.2MB注：文件命中 YYYY 代表年份，下同。高空分时日资料下载：ftp:/ftp.cd
5、c.noaa.gov/Datasets/ncep.reanalysis/pressure/4-times daily，1948 年至今，2.52.5类型 文件名 变量名 单位 文件大小气温 air.YYYY.nc 4xDaily Air temperature degK 499MB位势高度 hgt.YYYY.nc 499MB上升速度 omega.YYYY.nc Pascal/s 351MB相对湿度 rhum.YYYY.nc % 234MB绝对湿度 shum.YYYY.nc 4xDaily specific humidity kg/kg 234MB风速（u 分量） uwnd.YYYY.nc m/
6、s 497MB风速（v 分量） vwnd.YYYY.nc m/s 497MB二、日平均资料地面日资料下载路径：ftp:/ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.dailyavgs/surface/1948至今，2.52.5类型 文件名 变量名 单位 文件大小气温 air.sig995.YYYY.nc mean Daily Air temperature at sigma level 995 degK抬升指数 lftx.sfc.YYYY.nc mean Daily Surface Lifted Index degK最佳抬升指数 lftx4.sfc.YY
7、YY.nc mean Daily Best (4-layer) Lifted Index degK上升速度 omega.sig995.YYYY.nc mean Daily omega at surface Pascal/s潜在温度 pottmp.sig995.YYYY.nc mean Daily potential temperature at sigma level 995 degK大气可降水 pr_wtr.eatm.YYYY.nc mean Daily Precipitable Water for entire atmosphere kg/m2本站气压 pres.sfc.YYYY.nc m
8、ean Daily Pressure at surface Pascals相对湿度 rhum.sig995.YYYY.nc mean Daily relative humidity at sigma level 995 %海平面气压 slp.YYYY.nc mean Daily Sea Level Pressure Pascals风速（u 分量） uwnd.sig995.YYYY.nc mean Daily u-wind at sigma level 995 m/s风速（v 分量） vwnd.sig995.YYYY.nc mean Daily v-wind at sigma level 995
9、 m/s高空日资料下载路径：ftp:/ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.dailyavgs/pressure/1948至今，2.52.5类型 文件名 变量名 单位 文件大小 层次气温 air.YYYY.nc mean Daily Air temperature degK 124MB 17位势高度 hgt.YYYY.nc mean Daily Geopotential height m 124MB 17上升速度 omega.YYYY.nc mean Daily Omega Pascal/s 87.8MB 12相对湿度 rhum.YYYY.nc m
10、ean Daily relative humidity % 58.5MB 8绝对湿度 shum.YYYY.nc mean Daily specific humidity kg/kg 58.5MB 8风速（u 分量） uwnd.YYYY.nc mean Daily U-wind m/s 58.5MB 17风速（v 分量） vwnd.YYYY.nc mean Daily V wind m/s 58.5MB 17注：17 层（1000、925、850、700、600、500、400、300、250、200、150、100、70、50、30、20、10hPa）12 层（1000、925、850、700
11、、600、500、400、300、250、200、150、100hPa）8 层（1000、925、850、700、600、500、400、300hPa）三、月平均资料地面月平均资料下载路径：ftp:/ftp.cdc.noaa.gov/pub/Datasets/ncep.reanalysis.derived/surface/1948至今，2.52.5类型 文件名 变量名 单位 文件大小气温 air.mon.mean.nc Monthly Mean Air Temperature degK 30.4MB大气可降水 pr_wtr.mon.mean.nc Monthly Mean of Precipi
12、table Water Content kg/m2 30.4MB本站气压 pres.mon.mean.nc Monthly Mean of Surface Pressure Pascals 30.4MB相对湿度 rhum.mon.mean.nc Monthly Mean of Relative Humidity % 30.4MB海平面气压 slp.mon.mean.nc Sea Level Pressure Pascals 30.4MB风速（u 分量） uwnd.mon.mean.nc Monthly surface zonal wind m/s 30.4MB风速（v 分量） vwnd.mon
13、.mean.nc Monthly surface meridional wind m/s 30.4MB风速 wspd.mon.mean.nc Monthly surface wind speed m/s 30.4MB高空日资料下载路径：ftp:/ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.dailyavgs/pressure/1948至今，2.52.5类型 文件名 变量名 单位 其他气温 air.mon.mean.nc Monthly Mean Air Temperature degK 17 层位势高度 hgt.mon.mean.nc上升速度 omega
14、.mon.mean.nc相对湿度 rhum.mon.mean.ncshum.mon.mean.nc风速（u 分量） uwnd.mon.mean.nc m/s风速（v 分量） vwnd.mon.mean.nc m/swspd.mon.mean.ncpottmp.mon.mean.ncNCEP/NCAR Reanalysis 1: SummaryOne-Line Description:* NCEP/NCAR Reanalysis 1Temporal Coverage:* 4-times daily, daily and monthly values for 1948/01/01 to prese
15、nt* Long term monthly means, derived from data for years 1968 - 1996Spatial Coverage:* Global GridsLevels:* 17 Pressure level and 28 sigma levels. N/AUpdate Schedule:* DailyWe have separated the data documentation into seven sections:* Pressure level* Surface* Surface Fluxes* Other Fluxes* Tropopaus
16、e* Derived Data* Spectral CoefficientsUsage Restrictions:* NoneDetailed Description:* The NCEP/NCAR Reanalysis 1 project is using a state-of-the-artanalysis/forecast system to perform data assimilation using pastdata from 1948 to the present. A large subset of this data isavailable from PSD in its o
17、riginal 4 times daily format and asdaily averages. However, the data from 1948-1957 is a littledifferent, in the regular (non-Gaussian) gridded data. That datawas done at 8 times daily in the model, because the inputsavailable in that era were available at 3Z, 9Z, 15Z, and 21Z,whereas the 4x daily d
18、ata has been available at 0Z, 6Z, 12Z, and18Z. These latter times were forecasted and the combined resultfor this early era is 8x daily. The local ingestion process tookonly the 0Z, 6Z, 12Z, and 18Z forecasted values, and thus onlythose were used to make the daily time series and monthly meanshere.C
19、aveats:* Please read the problem list before using the data.Related File Naming & Structure Information:File Names:* See individual sections. Data in /Datasets/ncep.reanalysis/,Datasets/ncep.reanalysis.dailyavgs/,/Datasets/ncep.reanalysis.derived/* Data can be ftpd from ftp.cdc.noaa.govDataset Forma
20、t and Size:* PSD standard NetCDF most are (packed).* If you would like datasets on a media such as tape, you will needto get them from another institution. NCAR (link) provides such aservice for their datasets.Missing Data:* Missing data is flagged with a value of 32767s or 9.36e36fCitation:* For da
21、taset source, please cite:Kalnay et al.,The NCEP/NCAR40-year reanalysis project, Bull. Amer. Meteor. Soc., 77, 437-470,1996.* Please note: If you acquire NCEP Reanalysis data products fromPSD, we ask that you acknowledge us in your use of the data. Thismay be done by including text such as NCEP Rean
22、alysis dataprovided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, fromtheir Web site at http:/www.esrl.noaa.gov/psd/ in any documentsor publications using these data. We would also appreciatereceiving a copy of the relevant publications. This will help PSDto justify keeping the NCEP Reanalysis d
23、ata set freely availableonline in the future. Thank you!References:* March, 1996 BAMSOriginal Source:* NOAA National Center for Environmental PredictionContact:* Physical Sciences Division: Data ManagementNOAA/ESRL/PSD325 BroadwayBoulder, CO 80305-3328esrl.psd.datanoaa.govU.S. Department of Commerce | National Oceanic and AtmosphericAdministrationEarth System Research Laboratoryhttp:/www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.htmlSite Map
