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Spectral analysis of wind field in the Indian Ocean

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Title Spectral analysis of wind field in the Indian Ocean
 
Creator Rashmi, R.
Samiksha, S.V.
Polnikov, V.
Pogarskii, F.
Sudheesh, K.
Vethamony, P.
 
Subject Wind spectrum
Auto-regression
Slope
Variance
The Indian Ocean
 
Description 1191-1195
To study the variability in wind fields over the
Indian Ocean, we used ERA INTERIM daily winds
for the period 1979-2012. In order to analyse the temporal variation of wind
field, we partitioned the whole Indian Ocean
into 6 zones based on spatial inhomogeneity in the analysed wind fields.
Spectral analysis of the time series (extracted at the centre of each zone) was
performed using the auto-regression analysis based on the Yule-Walker
equations. and it confirms that universality of the spectral shaps Frequency
spectra show distinct annual variations at all zones; semi-annual variations are
observed in the Arabian Sea (Z1) and the Bay of Bengal (Z2) due to the seasonal
changes and gradually it disappears from equatorial region (Z3) to southern
Indian Ocean (Z6). Also, we observe local maxima at the scale of 1 and 0.5 days-1.
The characteristic shape of the spectrum was obtained at two different powers
of the frequencies.  Decay rate and
variance at all zones are analysed. The decay rate varies almost linearly as a
function of zones Z1 to Z6.  Trend of the
variance in low frequency range is linear whereas, in high frequency range is
exponential. The variance is large in the storm track region. It is found that
over the range of frequencies, wind field is independent and is increasing
along the zones Z1 to Z6. Latitudinal dependency is clearly observed in both
spectral slopes and variances.
 
Date 2016-06-26T19:30:11Z
2016-06-26T19:30:11Z
2014-07
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34417
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(7) [July 2014]