【摘要】 利用(40°N-60°N,20°W-150°E)范围内1963-1992年的臭氧格点数据资料,应用Morlet小波变换方法对臭氧演变进行了分析。结果表明:(1)臭氧存在明显的年际和年代际变化,其年际变化的特征时间尺度为2年和5年,年代际变化的特征时间尺度为12年;(2)臭氧准4年周期振荡最明显的地区出现在西欧,而准11年周期振荡最明显的地区则在东亚,其中12年时间尺度的周期振荡最强。更多还原

【Abstract】 It is well known that the climate system and some of its elements present notabme interdecadal feature.As an important tracer of atmospheric circulation,ozone has a vital climatic and biological effect in the earth system,and its concentration can be modulated by some synoptic system activity,such as frontal passage,cyclonic/anticyclonic disturbance and mass exchange between stratosphere and troposphere.Because ozonosphere protects the earth’s ecosystem from exceed solar ultraviolet radiation,it is important to study its temporal-spatial distribution. The content of the atmospheric ozone in the stratosphere is determined by both photochemical and dynamic processes which are related to solar activity and general circulation respectively.The solar cycle and long-period oscillation in general circulation should have some effect on ozone change.In order to seek the relationship between them on interannual and interdecadal scales,the Morlet wavelet transform is used.The modulus of averaged Morlet wavelet transform represents energy density.The ozone grid data derived from ground-based(WOUDC) and satellite observational(TOMS) data during the period of 1963 to 1992 are used.Here,the WOUDC data range from 1963 to 1985 and TOMS from 1979 to 1992.Comparison between the two data sets during 19791985 indicates that their change trends are in agreement.The studied region is(40°N60°N,20°W150°E).The relative sunspot number data in the same period are also used to compare the characteristics of ozone change and solar cycle.The results show that,(1) there exist evident interdecadal and interannual variations in atmospheric ozone variation in the studied region.The region with the maximum value of total ozone modulus of averaged Morlet wavelet is defined as the Maximum Amplitude Activity Centre(MAAC).(2) For the interannual variation,there are two characteristic time scales,2-year and 5-year.As for the interdecadal variation,its characteristic time scale is 12-year.It is interesting that this time scale is corresponding to the qusi-23-year oscillation of the solar activity.(3) The MAAC of averaged annual ozone change with 2-year characteristic time scale is located at(50°N,10°W).That is,in western Europe the ozone quasi-4-year oscillation is evident.The MAAC of averaged annual ozone change with 12-year characteristic time scale is located at(40°N,60°E),in this region there usually exits an ozone lower value centre,and the periodic oscillation with 12-year time scale is the most obvious changing composition.(4) The MAAC of averaged annual ozone change with 5-year characteristic time scale is located at(40°N,100°E),which means there is an evident ozone quasi-11year cycle in eastern Asia,which bears some relation to the quasi-11-year oscillation of the solar activity.(5) Similar to the sunspot activity,atmospheric ozone also has the quasi-11-year cycle,and there is certain phase difference between them.更多还原