MSR资料中臭氧层演变及恢复趋势的分析

Total ozone change and its recovery trend in a new reanalysis data

利用一种新的全球臭氧总量再分析(MSR)数据,分析了1978—2008年臭氧总量的时空演变趋势.结果发现:全球平均臭氧总量变化在1996年以前主要表现为显著的下降,其后下降趋势变缓,进入WMO所规定臭氧恢复第1阶段的变化模式.前期臭氧下降趋势为-1.037 4×10-4 cm/月,后期减小为-3.750 0×10-6cm/月;1996年以前全球臭氧总量为普遍减少,显著区域主要集中在北半球中纬度和南半球中高纬度,1996年以后在60°S～30°N间和北美北部及其以东海域出现有大面积的臭氧总量增加的区域,臭氧增加和减少的量均较少;不同地区臭氧总量的变化均不相同,青藏高原为持续减少转为略有增加,赤道西太平洋由基本不变转为增加,南极从急剧减少转为略有增加.

Using MSR global total ozone data,spatial-temporal change of global total ozone from 1978 to 2008 have been constructed.The results are as follows:① the global even total ozone has observably reduced before 1996,and descendent trend has diminished after that.The regression coefficient was-1.037 4×10-4cm/month before March 1996,it was-3.750 0×10-6cm/month after that.② The total ozone has generally decreased in global before 1996,and remarkable descendent region has appeared in middle latitude of the Northern Hemisphere and middle-high latitude of the Southern Hemisphere.Since 1996,large-scale total ozone increased region was found between 60°S—30°N and the north of North America and the east sea area.But the increased and decreased amounts were tiny.③ Ozone change status was different in diverse regions.The total ozone has consistent reduced,then slightly increased over the Tibetan Plateau.It has almost steadied at the first time,and then increased in West Pacific Ocean.It has experienced the change of sharp reduced-slightly increased over South Pole.