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| Titel |
Observational and Dynamical Wave Climatologies. VOS vs Satellite Data |
| VerfasserIn |
Victoria Grigorieva, Sergei Badulin, Anna Chernyshova |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250075830
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| Zusammenfassung |
| The understanding physics of wind-driven waves is crucially important for fundamental
science and practical applications. This is why experimental efforts are targeted at both
getting reliable information on sea state and elaborating effective tools of the sea wave
forecasting.
The global Visual Wave Observations and satellite data from the GLOBWAVE project of
the European Space Agency are analyzed in the context of these two viewpoints. Within the
first “observational” aspect we re-analyze conventional climatologies of all basic wave
parameters for the last decades [5]. An alternative “dynamical” climatology is introduced as a
tool of prediction of dynamical features of sea waves on global scales. The features of wave
dynamics are studied in terms of one-parametric dependencies of wave heights on wave
periods following the theoretical concept of self-similar wind-driven seas [3, 1, 4] and
recently proposed approach to analysis of Voluntary Observing Ship (VOS) data
[2].
Traditional “observational” climatologies based on VOS and satellite data collections
demonstrate extremely consistent pictures for significant wave heights and dominant periods.
On the other hand, collocated satellite and VOS data show significant differences
in wave heights, wind speeds and, especially, in wave periods. Uncertainties of
visual wave observations can explain these differences only partially. We see the key
reason of this inconsistency in the methods of satellite data processing which are
based on formal application of data interpolation methods rather than on up-to-date
physics of wind-driven waves. The problem is considered within the alternative
climatology approach where dynamical criteria of wave height-to-period linkage are
used for retrieving wave periods and constructing physically consistent dynamical
climatology.
The key dynamical parameter – exponent R of one-parametric dependence Hs ~ TR
shows dramatically less pronounced latitudinal dependence as compared to observed Hs and
T of conventional climatology in both satellite and VOS data collections. It can be treated as
an effect of interaction of wind-driven seas and swell on global scales as it was stated in [2].
Further study combining the alternative and conventional climatologies can help to
detail this important dynamical effect of global wave dynamics. The progress in
satellite data processing and their physical interpretation is of great value for such
study.
The work was supported by Russian Foundation for Basic Research grant 11-05-01114-a
and the Russian government contracts No.11.G34.31.0035, No.11.G34.31.0078.
References
[1]   S. I. Badulin, A. V. Babanin, D. Resio, and V. Zakharov. Weakly turbulent
laws of wind-wave growth. J. Fluid Mech., 591:339–378, 2007.
[2]   S. I. Badulin and Grigorieva V. G. On discriminating swell and wind-driven
seas in voluntary observing ship data. J. Geophys. Res., 117(C00J29), 2012.
[3]   S. I. Badulin, A. N. Pushkarev, D. Resio, and V. E. Zakharov. Self-similarity
of wind-driven seas. Nonl. Proc. Geophys., 12:891–946, 2005.
[4]   E. Gagnaire-Renou, M. Benoit, and S. I. Badulin. On weakly turbulent
scaling of wind sea in simulations of fetch-limited growth. J. Fluid Mech.,
669:178–213, 2011.
[5]   S. K. Gulev, V. Grigorieva, A. Sterl, and D. Woolf. Assessment for the
reliability of wave observations from voluntary observing ships: insights from the
validation of a global wind wave climatology based on voluntary observing ship
data. J. Geophys. Res. – Oceans, 108(C7):3236, doi:10,1029/2002JC001437, 2003. |
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