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A statistical determination of the random observational errors present in Voluntary Observing Ships meteorological reports

A statistical determination of the random observational errors present in Voluntary Observing Ships meteorological reports
A statistical determination of the random observational errors present in Voluntary Observing Ships meteorological reports
The random observational errors for meteorological variables within the Comprehensive Ocean–Atmosphere Dataset (COADS) have been determined using the semivariogram statistical technique. The error variance has been calculated using four months of data, spanning summer and winter months and the start and end of the dataset. The random errors found range from 1.3 to 2.8 m s?1 for 10-m-corrected wind speed, 1.2 to 7.1 mb for surface pressure, 0.8° to 3.3°C for 10-m air temperature, 0.4° to 2.8°C for sea surface temperature, and 0.6 to 1.8 g kg?1 for 10-m specific humidity. The air temperature and specific humidity random observational errors contain a dependence on their mean values, but correlations between errors and mean values are low for the other variables analyzed. The accuracy of the error estimates increases with the number of observational data pairs used in the analysis. Wind speed random observational errors were reduced by height correction and by the use of the Lindau Beaufort Scale.
0739-0572
905-914
Kent, E.C.
ea23f6f0-ccf6-4702-a5c9-184e9c5d4427
Challenor, P.G.
a7e71e56-8391-442c-b140-6e4b90c33547
Taylor, P.K.
3ef27388-c14e-4f4b-85fc-97bb17d089d2
Kent, E.C.
ea23f6f0-ccf6-4702-a5c9-184e9c5d4427
Challenor, P.G.
a7e71e56-8391-442c-b140-6e4b90c33547
Taylor, P.K.
3ef27388-c14e-4f4b-85fc-97bb17d089d2

Kent, E.C., Challenor, P.G. and Taylor, P.K. (1999) A statistical determination of the random observational errors present in Voluntary Observing Ships meteorological reports. Journal of Atmospheric and Oceanic Technology, 16 (7), 905-914. (doi:10.1175/1520-0426(1999)016<0905:ASDOTR>2.0.CO;2).

Record type: Article

Abstract

The random observational errors for meteorological variables within the Comprehensive Ocean–Atmosphere Dataset (COADS) have been determined using the semivariogram statistical technique. The error variance has been calculated using four months of data, spanning summer and winter months and the start and end of the dataset. The random errors found range from 1.3 to 2.8 m s?1 for 10-m-corrected wind speed, 1.2 to 7.1 mb for surface pressure, 0.8° to 3.3°C for 10-m air temperature, 0.4° to 2.8°C for sea surface temperature, and 0.6 to 1.8 g kg?1 for 10-m specific humidity. The air temperature and specific humidity random observational errors contain a dependence on their mean values, but correlations between errors and mean values are low for the other variables analyzed. The accuracy of the error estimates increases with the number of observational data pairs used in the analysis. Wind speed random observational errors were reduced by height correction and by the use of the Lindau Beaufort Scale.

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Published date: July 1999

Identifiers

Local EPrints ID: 50053
URI: http://eprints.soton.ac.uk/id/eprint/50053
ISSN: 0739-0572
PURE UUID: 29f4af17-de2f-4552-9a6a-43fff9f7b58b

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Date deposited: 16 Jan 2008
Last modified: 13 Mar 2019 20:52

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Contributors

Author: E.C. Kent
Author: P.G. Challenor
Author: P.K. Taylor

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