| Abstract: | A grid-by-grid counting of interdecadal trend turning (ITT) of annual mean surface air temperature (SAT) and total precipitation at 67,359 terrestrial grids in the period 1951-2002 is presented. An analysis of the last ITTs of SAT and total precipitation in the period, in the context of both occurrence time and linear trends after the breakpoint, indicates that a warming trend has become highly significant across most reagent of the world in the late 20th Century. Most terrestrial grids have recorded an ITT of total precipitation in either the 1970s or 1980s, and 45.7% of the terrestrial grids in the study have seen a decreasing trend in total annual precipitation after the breakpoint, with the remaining 54.3% having experienced an increasing trend. Basically, global terrestrial regions have experienced either an increasingly warm and dry climate or an increasingly warm and wet climate. An analysis of ITT of regional mean SAT and total precipitation in 22 regions shows that the Northern American continent has become increasingly warm and dry after the last interdecadal breakpoint. Meanwhile, the African continent has become increasingly warm and wet, with both Europe and most of Asia having the same trend. Southern South America and the West of Australia have experienced an opposite trend in climate, becoming increasingly cold and wet. |
