LONG-RANGE SOUND-PROPAGATION IN THE ARCTIC BASIN

Propagation of acoustic signals along a range-dependent track in the A rctic Basin is considered. The form of a model pulse is compared with the wave form obtained in acoustic monitoring in the Arctic Basin. Cal culations were carried out with a program based on the coupled mode me thod. This program takes into account the hydroacoustic waveguide para meters affecting the amplitude-time signal structure. This allowance y ielded a satisfactory agreement between calculations and the experimen t. The effect of hydrological factors on the sound held structure and characteristics of separate modes are considered. This consideration a llows us to determine the trend of temperature changes of the Atlantic waters intruding in the Arctic Basin and temperature changes in the u pper water layer.