氟氯碳化合物的分解及对其损耗O3和臭氧消耗潜势的影响

采用计数物种法模拟氟氯碳化合物在大气中的分解行为，研究结果表明，ＨＣＦＣ－２２及ＣＦＣ－１１在在气中分解总量的２．７７％６和９８．２３％是在２０ｋｍ以上区域分解，正是这一部分的分解产物向平流层引入了Ｃｌ原子、破坏了Ｏ３，对其臭氧消耗潜势（ＯＤＰ）有着主要的贡献；研究结果还表明，ＨＣＦＣ－２２与ＣＦＣ－１１在平流层破坏Ｏ３的效率有极大的差别，在本计算的条件下，平流层上部单个Ｃｌ原子破坏Ｏ３的相差近６

STUDY ON THE DECOMPOSITION OF HALOCARBONS AND ITS IMPACT ON O_3 DESTRUCTION AND OZONE DEPLETION POTENTIAL

The decomposition of halocarbons and its impact on ozone destrution have been studied with counter species method. The 2. 77% of total amount of decomposed HCFC-22 and 98. 23% for CFC-11 decompose above 20km. It is these decomposed substanses that introduce Cl atom into stratosphere, destruct O3 and make a main contribution to their ozone depletion potentials (ODP). There are great difference on efficiency of de-structing O3 between CFC-11 and HCFC-22 for single Cl atom in different regions. In our computation conditions,this difference is about 600 times in upper stratosphere. It is the amount of halocarbon decomposition in stratosphere and the ability of destruction O3 of single Cl atom that make the great different ODP between CFCs and HCFCs.