Influence of the Atlantic Ocean on the magnitude of air temperature trends under current warming

An analysis is made of the magnitudes of the linear trends of daily mean temperature in the city of Minsk for the period from 1966 to 2008. It is found that the largest magnitudes of trends in the annual variation correspond to mid-January as well as to the end of July-August, whereas in May and in November they are poorly pronounced (positive or even negative). The maximum magnitudes of the air temperature trends are in good agreement with maximum warm advection by currents of the Gulf Stream system, while modest warm advection by currents corresponds to weak positive and even negative magnitudes of the temperature trends. Consequently, the magnitude of the temperature trends in the annual variation is modulated by warm advection by currents of the Gulf Stream system which contains a half-yearly component and is determined by natural factors. Therefore, the driving forces of current climate warming cannot be attributed solely to the increase of greenhouse gases in the atmosphere.