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NOAA's PRECipitation REConstruction over Land (PREC/L)

Mean files have been converted to netCDF4-classic format

Brief Description:

• NOAA's Precipitation Reconstruction over Land (PREC/L)

Temporal Coverage: Monthly values 1948/01 to Nov 2019 except the 0.5 degree data, which runs behind. Long Term Mean 1981-2010 Spatial Coverage: 2.5 degree latitude x 2.5 degree longitude global grid (144x72). 88.75N - 88.75S, 1.25E - 358.75E. 1.0 degree latitude x 1.0 degree longitude global grid (360x180). 89.50N - 89.50S, 0.5E - 359.50E. 0.5 degree latitude x 0.5 degree longitude global grid (720x360). 89.75N - 89.75S, 0.25E - 359.75E.

Levels:

• Surface

Update Schedule:

• Near Real-time at NOAA/CPC

Download/Plot Data:

Variable	Statistic	Download File	Create Plot/Subset
Precipitation	Mean	precip.mon.mean.2.5x2.5.nc
Precipitation	Number of Gauges	precip.mon.number_gauges.2.5x2.5.nc
Precipitation	Long Term Mean	precip.mon.ltm.2.5x2.5.nc
Precipitation	Mean	precip.mon.mean.1x1.nc
Precipitation	Number of Gauges	precip.mon.number_gauges.1x1.nc
Precipitation	Long Term Mean	precip.mon.ltm.1x1.nc
Precipitation	Mean	precip.mon.mean.0.5x0.5.nc
Precipitation	Number of Gauges	precip.mon.number_gauges.0.5x0.5.nc
Precipitation	Long Term Mean	precip.mon.ltm.0.5x0.5.nc

Usage Restrictions:

• None

Detailed Description:

• The monthly data set consists of three files containing monthly averaged precipitation totals. Precipitation is available at 3 spatial resolutions. The global analyses are defined by interpolation of gauge observations over land (PREC/L) and by EOF recon- struction of historical observations over ocean (PREC/O). Gauge observations are from over 17 000 stations collected in the Global Historical Climatology Network (GHCN), version 2, and the Climate Anomaly Monitoring System (CAMS) datasets. An OI technique of Gandin was used to assimilate the observations. The mean distribution and annual cycle of precipitation observed in the PREC/L showed good agreement with those in several published gauge-based datasets, and the anomaly patterns associated with ENSO resemble those found in previous studies. All maps are stored using a landmask as smoothing puts values well over the oceans. The 1x1 and 0.5x0.5 are stored with a from CPC at their ftp site which contains 1's and 0s. The 2.5x2.5 is stored using the CPC provided % land file. It has values for each gridbox from 0 to 100. We stored all values where the values were >0. You may decide to further mask the data using their land file and a different cutoff.

Caveats:

• None

Related File Naming & Structure Information:

File Names:

• /Datasets/precl/2.5deg/precip.mon.mean.2.5x2.5.nc.
• /Datasets/precl/2.5deg/precip.mon.ltm.2.5x2.5.nc.
• /Datasets/precl/1.0deg/precip.mon.mean.1x1.nc.
• /Datasets/precl/1.0deg/precip.mon.ltm.1x1.nc.
• /Datasets/precl/0.5deg/precip.mon.mean.0.5x0.5.nc
• /Datasets/precl/0.5deg/precip.mon.ltm.0.5x0.5.nc

OpenDap File Names:

• https://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/precl/2.5deg/precip.mon.mean.2.5x2.5.nc
• https://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/precl/2.5deg/precip.mon.ltm.2.5x2.5.nc
• https://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/precl/1.0deg/precip.mon.mean.1x1.nc
• https://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/precl/1.0deg/precip.mon.ltm.11.nc
• https://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/precl/0.5deg/precip.mon.mean.0.5x0.5.nc
• https://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/precl/0.5deg/precip.mon.ltm.0.5x0.5.nc

Dataset Format and Size:

• PSD standard NetCDF 31 Mbyte file for each monthly file.
• PSD standard NetCDF 195 Mbyte file for 1x1 monthly file.
• PSD standard NetCDF 746 Mbyte file for 0.5x0.5 each monthly file.

Missing Data:

• Missing data is flagged with a value of -9.96921e+36f.

Citation:

• Chen, M., P. Xie, J. E. Janowiak, and P. A. Arkin, 2002: Global Land Precipitation: A 50-yr Monthly Analysis Based on Gauge Observations, J. of Hydrometeorology, 3, 249-266
• Please note: If you acquire PRECL Precipitation data products from PSD, we ask that you acknowledge us in your use of the data. This may be done by including text such as PRECL Precipitation data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at https://www.esrl.noaa.gov/psd/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSD to justify keeping the PRECL Precipitation data set freely available online in the future. Thank you!

References:

Chen, M., P. Xie, J. E. Janowiak, and P. A. Arkin, 2002: Global Land Precipitation: A 50-yr Monthly Analysis Based on Gauge Observations, J. of Hydrometeorology, 3, 249-266

Original Source:

• Dr. May (Mingyue) Chen
  Climate Prediction Center
  5200 Auth Road, #805B
  Camp Spings MD 20764
  Tel: (301) 763-8000 ext. 7506
  Fax: (301) 763-8125
  E-mail: mingyue.chen@noaa.gov
  original ftp: ftp://ftp.cpc.ncep.noaa.gov/precip/50yr/

Contact:

• Physical Sciences Division: Data Management
  NOAA/ESRL/PSD
  325 Broadway
  Boulder, CO 80305-3328
  esrl.psd.data@noaa.gov