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    Influence of Indian summer monsoon variability on the surface waves in the coastal regions of eastern Arabian Sea

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    Ann_Geophys_34_871.pdf (6.732Mb)
    Date
    2016
    Author
    SanilKumar, V.
    Jesbin, G.
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    Abstract
    We assess the influence of monsoon variability on the surface waves using measured wave data covering 7 years and reanalysis data from 1979 to 2015 during the Indian summer monsoon (JJAS) in the eastern Arabian Sea. The inter-annual comparison shows that the percentage of higher wave heights (>2.5m) is higher (~26%) in 2014 than in other years due to the higher monsoon wind speed (average speed ~7.3ms<sup>-1</sup>) in 2014. Due to the delayed monsoon, monthly average significant wave height (H<sub>m0</sub>) of June was lowest (~1.5m) in 2009. The spectral peak shifted to lower frequencies in September due to the reduction of wind seas as a result of decrease in monsoon intensity. The study shows high positive correlation (r~0.84) between average low-level jet (LLJ) for the block 0-15°N, 50-75°E and H<sub>m0</sub> of eastern Arabian Sea in all the months except in August (r~0.66). The time series data on wave height shows oscillations with periods 5 to 20 days. Wavelet coherence analysis indicates that the LLJ and Hm0 are in-phase related (phase angle 0°) almost all the time and LLJ leads Hm0. The monsoon seasonal anomaly of H<sub>m0</sub> is found to have a negative relationship with the Oceanic Nino Index indicating that the monsoon average H<sub>m0</sub> is relatively low during the strong El Nino years
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    http://drs.nio.org/drs/handle/2264/5051
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