The Effect of Eurasian Snow Cover on Regional and Global Climate Variations

摘要: The sensitivity of the global climate system to interannual variability he Eurasian snow cover has been investigated with numerical models. It was found that heavier than normal in spring leads a “poor” monsoon over Southeast Asia thereby verifying an idea 100 years old. poor characterized by reduced rainfall India and Burma, wind stress Indian Ocean, lower temperatures on Asian land mass overlying atmospheric column, tropical jet, increased soil moisture, other features associated monsoons. Lighter led “good” anomalies like those described above but opposite sign. Remote responses from field perturbation include readjustment Northern Hemispheric midlatitude, equatorially symmetric response geopotential height temperature weak, significant, perturbations surface heat flux Pacific. The physics responsible for regional involves all elements both budget full column. In essence, snow, moisture act keep column colder during heavy simulation thus reducing land–ocean contrast needed initiate monsoon. remote are driven heating large scale air-sea interactions precipitation events. The model winds experiment were used drive ocean model. SST developed weak El Nino equatorial Pacific. A coupled ocean-atmosphere perturbed only anomalous also run it much stranger clearly amplified anomaly These results show important role evolving (not specified) sea experiments real system. Our general demonstrate importance processes dynamics their possible as one factors could trigger ENSO events.