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Intercomparison of two-dimensional wave spectra obtained from microwave instruments, buoys and WAModel simulations during the surface wave dynamics experiment

MPS-Authors

Hasselmann,  Susanne
MPI for Meteorology, Max Planck Society;

Bennefeld,  Christian
MPI for Meteorology, Max Planck Society;

/persons/resource/persons37172

Hasselmann,  Klaus
MPI for Meteorology, Max Planck Society;

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Citation

Hasselmann, S., Bennefeld, C., Hasselmann, K., Graber, H., Jackson, F. C., Hauser, D., et al. (1998). Intercomparison of two-dimensional wave spectra obtained from microwave instruments, buoys and WAModel simulations during the surface wave dynamics experiment. Report / Max-Planck-Institut für Meteorologie, 258. doi:10.17617/2.3185922.


Cite as: https://hdl.handle.net/21.11116/0000-0005-7564-7
Abstract
An intercomparison is made of two dimensional wave spectra obtained from buoys
and various remote sensing microwave systems and predicted by the WAModel dur-
ing the Surface Wave Dynamics Experiment (SWADE). The overall agreement be-
tween the measurements and the model is satifactory, but some differences in detail
require further investigation. The buoy data yield reliable mean spectral parame-
ters, but the maximum likelihood retrieval algorithm tends to produce directional
distributions that are broader than those of other instruments. Various microwave
instruments (ROWS, RESSAC, SRA) show good promise for the determination of
2d-wave spectra, but exhibit individual shortcomings (calibration uncertainties, di-
rectional ambiguity, impact of aircraft motion) that need to be further studied.
The SAR system yields reliable retrievals with respect to the general spectral dis-
tribution, but suffers in this experiment from an undetermined calibration factor.
Deviations between the WAModel and instrumental data could be largely attributed
to wind field errors, but the model also exhibits deficiencies in the development of
short-fetch wave systems and in the wave spectral response to rapidly turning wind
fields.