On this page: Temporal Coverage | Spatial Coverage | Levels | Update Schedule | Download/Plot Data | Analysis Tools
Restrictions | Details | Caveats | File Naming | Citation | References | Original Source | Contact

CPC Unified Gauge-Based Analysis of Daily Precipitation over CONUS RT

Brief Description:

Daily files have been converted to unpacked netCDF4-classic from netCDF3, packed.
  • CPC .25x.25 Daily US Unified Precipitation gridded and smoothed

Temporal Coverage:

  • Daily 2007/01/01 to present: measurement accumulated to 12z of the day
  • Monthly 1948/01 to present.

Spatial Coverage:

  • 0.25 - degree latitude x 0.25 - degree longitude US grid (300x120).
  • 20.125N-49.875N, 230.125E-304.875E.

Levels:

  • N/A

Update Schedule:

  • Daily

Download/Plot Data:

Variable Statistic Level Download File Create Plot/Subset
Precipitation Daily Total Surface See List plot

Usage Restrictions:

  • None

Detailed Description:

  • This data set is part of products suite from the CPC Unified Precipitation Project that are underway at NOAA Climate Prediction Center (CPC). The primary goal of the project is to create a suite of unified precipitation products with consistent quantity and improved quality by combining all information sources available at CPC and by taking advantage of the optimal interpolation (OI) objective analysis technique. The gauge analysis here covers the Conteminous United States on a fine-resolution and is quantitatively consistent with that covering the global land on a coarser resolution. See their CPC's data docs for more details.

    Landmask is such that actual data resides between 20N-49.5N (lat grids 1-118) and 233.75E to 292.75 (lon grids 56-292).

    Values are for over the continental US. Data is daily from 1948-2006. Values are accumulated from 12z of the day before to 12z of the day (with no missing grids ).A land-sea mask is supplied.

Caveats:

  • None

Related File Naming & Structure Information:

File Names:

  • precip.yyyy.nc for daily  (In directory: /Datasets/cpc_us_precip/)
  • precip.time,statistic.nc for monthly, long term means  (In directory: /Datasets/cpc_us_precip/)

OpenDap File Names:

  • http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/cpc_us_precip/precip.yyyy.nc for daily  

Dataset Format and Size:

  • PSD standard NetCDF 37 Mbyte file for each yearly file (packed).
  • PSD standard NetCDF 37 Mbyte file for each daily long term mean file (packed).
  • PSD standard NetCDF 62 Mbyte file for each monthly file (packed).
  • PSD standard NetCDF 1 Mbyte file for each monthly long term mean file (packed).

Missing Data:

  • No missing data.

Citation:

  • Please note: If you acquire CPC US Unified 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 CPC US Unified Precipitation data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://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 CPC US Unified Precipitation data set freely available online in the future. Thank you!

References:

  • (Interpolation algorithm) Xie_et_al_2007_JHM_EAG.pdf Xie, P., A. Yatagai, M. Chen, T. Hayasaka, Y. Fukushima, C. Liu, and S. Yang (2007), A gauge-based analysis of daily precipitation over East Asia, J. Hydrometeorol., 8, 607. 626.
  • (Gauge Algorithm Evaluation) Chen_et_al_2008_JGR_Gauge_Algo.pdf Chen, M., W. Shi, P. Xie, V. B. S. Silva, V E. Kousky, R. Wayne Higgins, and J. E. Janowiak (2008), Assessing objective techniques for gauge-based analyses of global daily precipitation, J. Geophys. Res., 113, D04110, doi:10.1029/2007JD009132.
  • (Construction of the Daily Gauge Analysis) Chen_et_al_2008_Daily_Gauge_Anal.pdf Chen, M., P. Xie, and Co-authors (2008), CPC Unified Gauge-based Analysis of Global Daily Precipiation, Western Pacific Geophysics Meeting, Cairns, Australia, 29 July - 1 August, 2008.

Original Source:

Contact:

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