Statistical Features of the Wind Field over the Indian Ccean for the period 1998-2008

Details Statistical Features of the Wind Field over the Indian Ccean for the period 1998-2008 Statistical Features of the Wind Field over the Indian Ccean for the period 1998-2008

2011-09-23

arxiv.org/abs/1109.5073v1

Physics

Atmospheric and Oceanic Physics

28 pages, 8 figures in the text, 3 tables, appendix with 5 figure

Scientific paper

We have done a statistical analysis of the wind field from the archive of NCEP/NOAA over the Indian Ocean for the period 1998-2008yy, which is given on a grid 1x1.25 of latitude-longitude with 3h time-step. Initial analysis includes mapping the average wind fields and fields of mean density of the wind-kinetic-energy flux , obtained with different periods of time averaging T, as well as the assessment of 11-year trends in these fields. The subsequent analysis is concerned with partition of the Indian ocean area into 6 zones, provided by the spatial inhomogeneity of the analyzed wind field. This analysis includes: a) an assessment of temporal variations for the wind speed field averaged over the Ocean and the zones and for the field of wind-energy flux; b) construction of time history series of these fields averaged with different scales, and estimating frequency spectra of these series; c) finding the extremes of the wind field (in the zones of Indian Ocean); d) construction of histograms of the wind field; and e) calculation of the first four statistical moments for the wind field (in zones and in the whole Ocean). The results obtained allow us to estimate the stored energy of the wind field in the Indian Ocean, its climate variability, and distribution of the above statistical characteristics of wind field in the Indian Ocean.

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