TRENDS OF THE CHARACTERISTICS OF ANNUAL VARIATIONS IN TROPOSPHERIC AND STRATOSPHERIC TEMPERATURES

The evolution of the amplitude of annual variations (AAV) in the surfa ce air temperature and temperatures of different tropospheric and lowe r stratospheric layers is estimated in the presence of global changes in the earth climate system. The estimates are based on different mont hly mean and seasonal mean temperature data over recent decades (from greater than three decades to 140 years) and are obtained for differen t latitude ranges and the entire Northern and Southern hemispheres, in cluding separate estimates over the land and the ocean. A general decr ease in the AAV of surface air temperature over the land, especially i n the middle and high latitudes, is observed simultaneously with globa l warming from data over greater than 100 recent years. However, oppos ite tendencies occur over the land and certain oceanic regions. During the past few decades, a general decrease in lower stratosphere temper atures with a statistically significant increase in amplitudes of annu al variations in the high latitudes has corresponded to a general incr ease in the surface air temperature. Along with a qualitative analysis of interconnection between the revealed trends and different climatic mechanisms, they are compared with outputs of climatic models, includ ing general circulation models. In connection with the revealed evolut ion of annual temperature variations, a general tendency of decreasing the amplitude of quasi-biennial temperature oscillations in the tropo sphere and an opposite tendency in the stratosphere, both with simulta neous global warming, can be expected.