关键词: 冷暖期, 层次结构, 气候突变

Abstract: The atmosphere CO₂ gas, solar activity and volcanic eruptions are three major climate forcing. By comparing the climate forcing with the hierarchical structure of hemisphere surface temperature variations during last a hundred years, the possible external cause of the hemisphere surface temperature jump change has been investigated. For abrupt change of long-term climate in the northern hemisphere in 1924 (its timescale is about 77 years) and southern hemisphere in 1939 (its timescale is about 90 years), the greenhouse effect of atmosphere CO₂ gas is unimportant forcing. It is not very possibly caused by the obvious change in astronomical solar constant. For abrupt change of short-term climate in the northern hemisphere before 1924, there is evident corresponding of middle cool/warm period (its timescale is about 14 years) to frequently large volcanic eruptions on the low and middle/the middle and high latitude. The jump changes appeared in the southern hemisphere short-term climate (its timescale is about 5.6 years) is strongly influenced by the solar activity.

Key words: cold period, warm period, hierarchical structure, climate jump change