Modelled wave height vs. Jason-1 satellite altimetry
Yellow Sea
2008_07-12
English version

Average SWH conditions 
Scatter plot 
Error in 2 dimensions 
Error vs. forecast length 
Error vs. waveheight 
Temporal error statistics 
Information on the satellite observations  


Significant wave height (SWH) conditions observed from satellite

A large negative bias is evident in the SE part of the model domain. This is due to exposure to Pacific swell, which is not included in the model. There are also patches with large errors inside the Yellow Sea. This may be an artefact, since near-shore satellite data may be prone to errors.


Average satellite SWH

Histogram of all observations

Statistics for period Statistics for period

90% percentile of satellite SWH

Weekly averaged satellite SWH and 90% percentile

Statistics for period Statistics for period

Scatter plot and mean errors

All pairs of WAM (0-6 hour) and satellite observations have been used.
The number of observations in each 5x5 cm box is shown with colors. The red line represents the best fit to the data whereas the green dashed line represents a one to one relationship.


Errors in 2 dimensions

Average error statistics have been calculated over 100 km bins, to provide enough observations to obtain reliable 2D error estimates

Bias (WAM - altimetry)

Stddev

Statistics for period Statistics for period

Scatter index

Statistics for period

Histogram of comparisons

Statistics for period

Error statistics vs. forecast length  

Bias and standard deviations have been calculated over the whole domain, for every  hour of WAM forecast, up to 60 hours

Error statistics vs. wave height  

The bin size is 1 meter
Statistics for period Statistics for period

Temporal error statistics

Bias and stddev have been calculated for weekly averages
Statistics for period
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ocean - dmi/coi - 2009-08-05