Climatological data for clouds over the globe from surface observations, 1982--1991: The total cloud edition
- Colorado Univ., Boulder, CO (United States). Cooperative Inst. for Research in Environmental Sciences
- Washington Univ., Seattle, WA (United States). Dept. of Atmospheric Sciences
- Colorado Univ., Boulder, CO (United States). Dept. of Astrophysical, Planetary, and Atmospheric Sciences
Routine, surface synoptic weather reports from ships and land stations over the entire globe, for the ten-year period December 1981 through November 1991, were processed for total cloud cover and the frequencies of occurrence of clear sky, 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{degrees} {times} 2.5{degrees} for land and 5{degrees} {times} 5{degrees} 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 is found, in contrast to previous surface-based climatologies, that cloudiness is often greater at night than during the day.
- Research Organization:
- Oak Ridge National Lab., TN (United States). Carbon Dioxide Information Analysis Center
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10193602
- Report Number(s):
- ORNL/CDIAC--72; NDP--026A; ON: DE95002537; CNN: Grant NAG-1-998; Contract 144806-A-Q1
- Country of Publication:
- United States
- Language:
- English
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