Uncertainties in global ocean surface heat flux climatologies derived from ship observations

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A methodology to define uncertainties associated with ocean surface heat flux calculations has been developed and applied to a revised version of the Oberhuber global climatology, which utilizes a summary of the COADS surface observations. Systematic and random uncertainties in the net oceanic heat flux and each of its four components at individual grid points and for zonal averages have been estimated for each calendar month and the annual mean. The most important uncertainties of the 2{degree} x 2{degree} grid cell values of each of the heat fluxes are described. Annual mean net shortwave flux random uncertainties associated with errors ... continued below

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40 p.

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Gleckler, P.J. & Weare, B.C. August 1, 1995.

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  • Gleckler, P.J. Lawrence Livermore National Lab., CA (United States)
  • Weare, B.C. Univ. of California, Davis, CA (United States). Dept. of Land Air and Water Resources

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Description

A methodology to define uncertainties associated with ocean surface heat flux calculations has been developed and applied to a revised version of the Oberhuber global climatology, which utilizes a summary of the COADS surface observations. Systematic and random uncertainties in the net oceanic heat flux and each of its four components at individual grid points and for zonal averages have been estimated for each calendar month and the annual mean. The most important uncertainties of the 2{degree} x 2{degree} grid cell values of each of the heat fluxes are described. Annual mean net shortwave flux random uncertainties associated with errors in estimating cloud cover in the tropics yield total uncertainties which are greater than 25 W m{sup {minus}2}. In the northern latitudes, where the large number of observations substantially reduce the influence of these random errors, the systematic uncertainties in the utilized parameterization are largely responsible for total uncertainties in the shortwave fluxes which usually remain greater than 10 W m{sup {minus}2}. Systematic uncertainties dominate in the zonal means because spatial averaging has led to a further reduction of the random errors. The situation for the annual mean latent heat flux is somewhat different in that even for grid point values the contributions of the systematic uncertainties tend to be larger than those of the random uncertainties at most all latitudes. Latent heat flux uncertainties are greater than 20 W m{sup {minus}2} nearly everywhere south of 40{degree}N, and in excess of 30 W m{sup {minus}2} over broad areas of the subtropics, even those with large numbers of observations. Resulting zonal mean latent heat flux uncertainties are largest ({approximately}30 W m{sup {minus}2}) in the middle latitudes and subtropics and smallest ({approximately}10--25 W m{sup {minus}2}) near the equator and over the northernmost regions.

Physical Description

40 p.

Notes

OSTI as DE96001026

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  • Other Information: DN: PCMDI Report Number 26

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  • Other: DE96001026
  • Report No.: UCRL-ID--121951
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/113937 | External Link
  • Office of Scientific & Technical Information Report Number: 113937
  • Archival Resource Key: ark:/67531/metadc619881

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Creation Date

  • August 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 3:50 p.m.

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Gleckler, P.J. & Weare, B.C. Uncertainties in global ocean surface heat flux climatologies derived from ship observations, report, August 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc619881/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.