The Space-time Propagation Patterns of the Stratospheric Volcanic Aerosols and the Preliminary Analysis of Their Climate Effect

Based on the research of the propagation patterns of the stratospheric volcanic aerosols, the space time distribution function of Volcanic Explosivity Index (VEI) with the exponential decay is constructed which can reflect the volcano eruption intensity, the relative concentration, the propagation rate of the stratospheric volcanic aerosols and the volcano eruption location. Furthermore, time series of the volcanic activity indexes (1945—2008) every 3 months at middle and high latitudes of the Northern Hemisphere, the low latitudes of the Northern and Southern Hemisphere and the middle and high latitudes of the Southern Hemisphere are built up. Based on the time series of volcanic activity indexes, the influences of the volcano activity on the surface temperature at middle and high latitudes of the Northern Hemisphere, at low latitudes of the Northern and Southern Hemisphere and at middle and high latitudes of the Southern Hemisphere, are analyzed separately. The results indicate that either at the Northern and Southern hemisphere or at the tropical zone the ground layer air temperature decreases when the volcanic activity is strong, while it increases when the volcanic activity is weak. At the same time, the variations of the ground layer air temperature lag behind those of the volcanic activity.