Interannual fluctuations of the atmospheric pressure, sea surface temperature, and chlorophylla of the Arabian Sea

In order to estimate general trends of interannual variability (in 1985-2008), the Arabian Sea was divided into the four regions for which remotely sensed atmospheric pressure, sea surface temperature, and chlorophyll-a concentration were analyzed. In data analysis, the model of polyphonic fractalwave vibrator representing the hierarchical system of polyphonic oscillators with the resonance interaction between major tones and overtones was employed. In terms of the fractal-wave approach, the spectral characteristics should form the system of enclosed structures. These characteristics were estimated by the internal-spectral analysis. For the studied period, the expansion of the atmospheric low pressure zone (along the Pakistani and Indian coast) and rising sea surface temperatures (̃ 0.3-0.6°C) accompanied by a weak decline (̃ -0.1- 0.2 mg m^-3) in chlorophyll-a concentration were noticed. The trends evaluated were proposed to be the elements of lowfrequent fluctuation shaving a period of ̃ 60-70 years, reported earlier for some physical and biological variables for the northern hemisphere. It was assumed that a positive phase of this fluctuation will be over in the next 5-7 years after which the Arabian Sea will enter the phase of negative Indian °Cean Dipole, lasting the next 25-30 years, which might be accompanied by a moderate increase in biological productivity- as it had happened before, according to the paleontological data on sediment cores from the western Arabian Sea.