Numerical estimates of mechanical energy transfer from the atmosphere to the Indian ocean |
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| Authors: | G S Golitsyn V G Polnkov F A Pogarskii |
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| Institution: | 1. Obukhov Institute of Physics of the Atmosphere, Russian Academy of Sciences, Moscow, Russia
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| Abstract: | The field of mechanical energy transfer from the atmosphere to the ocean is computed for the first time. The numerical simulation of waves within the Indian Ocean (IO) water area for the period of 1998?C2009 is used. Mechanical energy transfer is described by two integrated parameters calculated per area unit: the speed of complete energy flux from wind to waves, I E (x, t), and the speed of complete losses in the energy of wind waves, D E (x, t). In order to solve this problem, the wind field W(x, t) (the NCEP/NOAA data) is used; the I E (x, t) and D E (x, t) fields are calculated on the basis of the WAM numerical model containing a modified source function. The results obtained allow us, first, to assess the characteristic spatial distribution of zones ??pumped?? by the wind with mechanical energy for both the wave field and the upper layer of the ocean by seasons, years, and the whole period discussed, second, to determine the extreme and average zonal values of I E (x, t) and D E (x, t), the degree of their shift spacing and balance B E = (I E + D E ); and third, to define the characteristic time scales of variations in the wind field and wave field energies, caused by energy transfer from the wind to waves in the zones and within the Indian ocean as a whole. These results significantly specify the climatic estimates obtained earlier. |
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