ICOADS Long-Term Means

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If you obtained the ICOADS data with Nov 2018 values before Dec 17 4:00pm MST, please redownload as it has been reprocessed due to issues at NCEP.

Brief Description:

  • The International Comprehensive Ocean-Atmosphere Data Set (ICOADS) is the most extensive collection of surface marine data spanning the past three centuries, together with simple gridded monthly summary products extending from 1800 forward.

Temporal Coverage:

  • Long-term monthly means, and percentage of years with extant data making up each climatological mean value, derived from data spanning 1971 - 2000 and 1981 - 2010.
  • Long-term monthly means, derived from data for years 1950 - 1979.

Spatial Coverage:

  • 2.0 degree latitude x 2.0 degree longitude global grid (90x180).
  • 89.0N - 89.0S, 1.0E - 359.0E.

Levels:

  • Sea Surface

Update Schedule:

  • Static

Download/Plot Data:

  • 1950 - 1979 long-term monthly means based on original COADS Release 1 (1854-1979) data.
    Variable Statistic Level Download File Create Plot/Subset
    Sea Surface Temperature (S) Long-Term Mean Surface sst.ltm.nc plot
    Air Temperature (A) Long-Term Mean Surface air.ltm.nc plot
    Scalar Wind (W) Long-Term Mean Surface wspd.ltm.nc plot
    U-wind (U) Long-Term Mean Surface uwnd.ltm.nc plot
    V-wind (V) Long-Term Mean Surface vwnd.ltm.nc plot
    Sea Level Pressure (P) Long-Term Mean Surface slp.ltm.nc plot
    Cloudiness (C) Long-Term Mean Surface cldc.ltm.nc plot
    Specific Humidity (Q) Long-Term Mean Surface shum.ltm.nc plot
    Relative Humidity (R) Long-Term Mean Surface rhum.ltm.nc plot
    Sensible Heat Parameter ([S-A]*W) Long-Term Mean Surface sflx.ltm.nc plot
    Latent Heat Parameter ([Qs-Q]*W) Long-Term Mean Surface lflx.ltm.nc plot
    U-wind Stress (U*W) Long-Term Mean Surface upstr.ltm.nc plot
    V-wind Stress (V*W) Long-Term Mean Surface vpstr.ltm.nc plot

Usage Restrictions:

  • None

Detailed Description:

  • Simple long-term monthly means, and percentage of years with extant data making up each climatological mean value, derived from ICOADS Release 3.0 (1981-2010) enhanced data.
  • Simple long-term monthly means, and percentage of years with extant data making up each climatological mean value, derived from ICOADS Release 2.5 (1971-2000) enhanced data.
  • Simple long-term monthly mean files constructed from the original COADS Release 1 (1854-1979) data.
Please refer to the ICOADS Website for more information about the ICOADS project, observational and summary products, and associated metadata.

Caveats:

  • Small numerical biases in previous netCDF files are described here.

Related File Naming & Structure Information:

File Names:

  • var.stat[.perc].nc   (In directory: /Datasets/icoads/2degree/enh/LTMs1981-2010)
  • var.stat[.perc].nc   (In directory: /Datasets/icoads/2degree/enh/LTMs1971-2000)
  • var.stat.nc   (In directory: /Datasets/icoads/2degree/LTMs1950-1979)

Dataset Format and Size:

  • PSL standard NetCDF >392 Kbyte file for each long-term mean and percentage of years in climatology files (packed).
  • PSL standard NetCDF >781 Kbyte file for each long-term mean wspd3 file.

Missing Data:

  • Missing data is flagged with a value of 32766s.

Citation:

  • Please note: If you acquire ICOADS data products from PSL, we ask that you acknowledge us in your use of the data. This may be done by including text such as ICOADS data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at https://psl.noaa.gov/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSL to justify keeping the ICOADS data set freely available online in the future. Thank you!

References:

Original Source:

  • Multinational. The US contribution is the result of a cooperative project between the National Oceanic and Atmospheric Administration (NOAA)--specifically its Earth System Research Laboratories (ESRL), its National Centers for Environmental Information (NCEI), and the Cooperative Institute for Research in Environmental Sciences (CIRES), conducted jointly with the University of Colorado--and the National Science Foundation's National Center for Atmospheric Research (NCAR).

Contact:

  • NetCDF questions:

    Physical Sciences Laboratory: Data Management
    NOAA/ESRL/PSL
    325 Broadway
    Boulder, CO 80305-3328
    psl.data@noaa.gov
  • Data questions:

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