Validation of ocean wind and wave data using triple collocation
S. Caires,Andreas Sterl +1 more
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In this article, a triple collocation statistical model was proposed to estimate the variances of the errors of the estimation of significant wave height and wind speed from the ERA-40 system.Abstract:
[1] Significant wave height and wind speed fields from ERA-40 are validated against buoy, ERS-1, and Topex altimeter measurements. To do so, we propose and apply a triple collocation statistical model. The model takes into account the random errors in observations and model results and allows the estimation of the variances of the errors. We first examine the case where the random errors of the different systems are independent, but situations where independence is not strictly observed are also considered. The results show that the ERA-40 predictions underestimate high values of significant wave height and, contrary to what would be obtained by less sophisticated statistical methods, wind speed, that the variance of the errors associated with the ERA-40 system is much higher than that of the errors of the measurements, and that the former shows a dependence on the value of the observations not present in the latter. The altimeter measurements of significant wave height are very precise, in contrast to the large uncertainty associated with the altimeter retrieved wind speeds.read more
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Journal ArticleDOI
The ERA‐40 re‐analysis
S. Uppala,Per Kållberg,Adrian Simmons,U. Andrae,V. da Costa Bechtold,M. Fiorino,J. K. Gibson,J. Haseler,A. Hernandez,Graeme Kelly,Xiaoming Li,Kazutoshi Onogi,Sami Saarinen,N. Sokka,Richard P. Allan,Richard P. Allan,Erik Andersson,Klaus Arpe,Magdalena Balmaseda,Anton Beljaars,L. van de Berg,Jean Bidlot,Niels Bormann,S. Caires,Frédéric Chevallier,A. Dethof,M. Dragosavac,Michael Fisher,Manuel Fuentes,Stefan Hagemann,Elías Hólm,Brian J. Hoskins,Lars Isaksen,Peter A. E. M. Janssen,Roy L. Jenne,A. P. McNally,Jean-François Mahfouf,Jean-Jacques Morcrette,Nick Rayner,Roger Saunders,P. Simon,Andreas Sterl,Kevin E. Trenberth,A. Untch,Drasko Vasiljevic,Pedro Viterbo,John S. Woollen +46 more
TL;DR: ERA-40 is a re-analysis of meteorological observations from September 1957 to August 2002 produced by the European Centre for Medium-Range Weather Forecasts (ECMWF) in collaboration with many institutions as mentioned in this paper.
Journal ArticleDOI
A Global View on the Wind Sea and Swell Climate and Variability from ERA-40
TL;DR: In this paper, a detailed global climatology of wind sea and swell parameters, based on the ERA-40 wave reanalysis, is presented, including the spatial pattern of the swell dominance of the Earth's oceans.
Journal ArticleDOI
Validation of a thirty year wave hindcast using the Climate Forecast System Reanalysis winds
TL;DR: A thirty one year wave hindcast (1979-2009) using NCEP's latest high resolution Climate Forecast System Reanalysis (CFSR) wind and ice database has been developed and is presented here.
Journal ArticleDOI
A possible solution for the problem of estimating the error structure of global soil moisture data sets
TL;DR: Scipal et al. as mentioned in this paper proposed a triple collocation error estimation technique to estimate the root mean square error of a set of three independent data sources, including passive microwave (TRMM), active microwave (ERS-2), and modeled (ERA-Interim reanalysis) soil moisture data sets.
Journal ArticleDOI
100-Year Return Value Estimates for Ocean Wind Speed and Significant Wave Height from the ERA-40 Data
S. Caires,Andreas Sterl +1 more
TL;DR: In this article, global estimates of 100-yr return values of wind speed and significant wave height are presented based on the ECMWF 40-yr Re-Analysis (ERA-40) data and are linearly corrected using estimates based on buoy data.
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