ON THE SEASONAL EFFECT OF ORBITAL VARIATIONS ON THE CLIMATES OF THE NEXT 4000 YEARS

A northern hemisphere thermodynamic climate model is used to compute t he effect of the insolation anomalies due to orbital variations in the climates for the nest 4000 years. Berger's mean monthly anomalies of insolation are used in the computations, which are carried out for 100 0, 2000, 3000 and 4000 years after present (kyears AP). The numerical simulations show that in the climates of the next 4000 years, due to t he effect of the orbital variations, springs and summers will be incre asingly dryer and falls and winters wetter than the present climate.