  To calculate the wind-waves in the Indian Ocean (IO), the wind field for the
period from 1998 to 2009 was used, obtained from the NCEP/NOAA archive, and
numerical model WAM (Cycle-4) was applied, modified by the new source function
proposed in Polnikov (2005). Based on buoy data for the Indian Ocean, the
fitting of the modified model WAM was done, which provides the win in accuracy
of calculations on 35%, in comparison with the original model. All the further
calculations of the wave fields in IO were made for these model settings. At
the first stage, the analysis of the simulation results involves a) mapping the
fields of the significant wave height <Hs(x,y,T,R)> and the wave energy
<Ea(x,y,T,R>, calculated with different scales of averaging in time T and space
R; b) estimating the fields of seasonal, annual and long-term variability; and
c) determining the 12-year trend of the annually averaged fields. The analysis
was carried out taking into account the previously introduced zoning the ocean
area, provided by the spatial inhomogeneity of the wind field [3]. Further
analysis includes a) creation of time series for the averaged (over zones and
across the ocean) wave height, <Hs(x,y,T,R)>, and wave energy, <Ea(x,y,T,R>; b)
construction of the frequency spectra of these series; c) finding the extrema
of wave field; d) making histograms of wave heights (in the zones and the whole
ocean); and e) calculating the first four statistical moments for the
waveheight field (in the zones and whole IO). The results obtained allow us to
estimate the stored energy of the wave field in the Indian Ocean and the scales
of its variability; to establish a positive 12-year trend of the averaged wave
height (about 1% per year) and wave energy (2% per year); to determine features
of the probability distribution; and to describe the statistical properties of
the wave field in the zones of the Indian ocean.
