Climatological Data For Clouds Over the Globe From Surface Observations, 1982-1991: The Total Cloud Edition (1994) (NDP-026a)

Hahn, C. J.; Warren, S. G.; London, J.

doi:10.3334/CDIAC/CLI.NDP026A

Title: Climatological Data For Clouds Over the Globe From Surface Observations, 1982-1991: The Total Cloud Edition (1994) (NDP-026a)

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Abstract

Routine, synoptic surface weather reports from ships and land stations over the entire globe, for the 10-year period December 1981 through November 1991, were processed for total cloud cover and the frequencies of occurrence of clear sky, sky-obscured due to precipitation, and sky-obscured due to fog. Archived data, consisting of various annual, seasonal and monthly averages, are provided in grid boxes that are typically 2.5° — 2.5° for land and 5° — 5° for ocean. Day and nighttime averages are also given separately for each season. Several derived quantities, such as interannual variations and annual and diurnal harmonics, are provided as well. This data set incorporates an improved representation of nighttime cloudiness by utilizing only those nighttime observations for which the illuminance due to moonlight exceeds a specified threshold. This reduction in the night-detection bias increases the computed global average total cloud cover by about 2%. The impact on computed diurnal cycles is even greater, particularly over the oceans where it is found (in contrast to previous surface-based climatologies), that cloudiness is often greater at night than during the day.For access to the data files, click this link to the CDIAC data transition website: http://cdiac.ess-dive.lbl.gov/ndps/ndp026a.html

Authors:

Hahn, C. J.; Warren, S. G.; London, J.

University of Colorado , Cooperative Institute for Research in Environmental Sciences; OSTI
University of Washington, Department of Atmospheric Sciences
University of Colorado, Department of Astrophysical, Planetary and Atmospheric Sciences

Publication Date:: Sat Oct 01 04:00:00 UTC 1994

Other Number(s):: osti:1394926; doi:10.3334/CDIAC/CLI.NDP026A; cdiac:doi 10.3334/CDIAC/cli.ndp026a

Research Org.:: Environmental System Science Data Infrastructure for a Virtual Ecosystem

Sponsoring Org.:: U.S. DOE > Office of Science (SC) > Biological and Environmental Research (BER) (SC-23)

Subject:: 54 ENVIRONMENTAL SCIENCES; NDP-026A; Occurrence of Clear Sky; Occurrence of Sky-Obscured due to Fog; Occurrence of Sky-Obscured due to Precipitation; Total Cloud Cover; amp; amt; avg; box; clat; clon; fmt; fq; frl; iav; idn; imoon; lo; lob; mgrp; nbxs; nlsta; nobs; nsn; nt; nyrs; phase; sd; size; sn; span; time; trnd; type; unc; vaf; year

OSTI Identifier:: 1394926

DOI:: https://doi.org/10.3334/CDIAC/CLI.NDP026A

Citation Formats


                    Hahn, C. J., Warren, S. G., and London, J. Climatological Data For Clouds Over the Globe From Surface Observations, 1982-1991: The Total Cloud Edition (1994) (NDP-026a).  United States: N. p., 1994. 
        Web.  doi:10.3334/CDIAC/CLI.NDP026A.

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                    Hahn, C. J., Warren, S. G., & London, J. Climatological Data For Clouds Over the Globe From Surface Observations, 1982-1991: The Total Cloud Edition (1994) (NDP-026a).  United States.  doi:https://doi.org/10.3334/CDIAC/CLI.NDP026A

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                    Hahn, C. J., Warren, S. G., and London, J. 1994.  
"Climatological Data For Clouds Over the Globe From Surface Observations, 1982-1991: The Total Cloud Edition (1994) (NDP-026a)".  United States.  doi:https://doi.org/10.3334/CDIAC/CLI.NDP026A.  https://www.osti.gov/servlets/purl/1394926. Pub date:Sat Oct 01 04:00:00 UTC 1994

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@article{osti_1394926,

  title        = {Climatological Data For Clouds Over the Globe From Surface Observations, 1982-1991: The Total Cloud Edition (1994) (NDP-026a)},

  author       = {Hahn, C. J. and Warren, S. G. and London, J.},

  abstractNote = {Routine, synoptic surface weather reports from ships and land stations over the entire globe, for the 10-year period December 1981 through November 1991, were processed for total cloud cover and the frequencies of occurrence of clear sky, sky-obscured due to precipitation, and sky-obscured due to fog. Archived data, consisting of various annual, seasonal and monthly averages, are provided in grid boxes that are typically 2.5° — 2.5° for land and 5° — 5° for ocean. Day and nighttime averages are also given separately for each season. Several derived quantities, such as interannual variations and annual and diurnal harmonics, are provided as well. This data set incorporates an improved representation of nighttime cloudiness by utilizing only those nighttime observations for which the illuminance due to moonlight exceeds a specified threshold. This reduction in the night-detection bias increases the computed global average total cloud cover by about 2%. The impact on computed diurnal cycles is even greater, particularly over the oceans where it is found (in contrast to previous surface-based climatologies), that cloudiness is often greater at night than during the day.For access to the data files, click this link to the CDIAC data transition website: http://cdiac.ess-dive.lbl.gov/ndps/ndp026a.html},

  doi          = {10.3334/CDIAC/CLI.NDP026A},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sat Oct 01 04:00:00 UTC 1994},

  month        = {Sat Oct 01 04:00:00 UTC 1994}

}

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DOI: https://doi.org/10.3334/CDIAC/CLI.NDP026A

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