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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Arctic ozone loss in threshold conditions: Match observations in 1997/1998 and 1998/1999
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Arctic ozone loss in threshold conditions: Match observations in 1997/1998 and 1998/1999

机译：阈值条件下的北极臭氧损失：1997/1998年和1998/1999年的观测值

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摘要

Chemical ozone loss rates inside the Arctic polar vortex were determined in early 1998 and early 1999 by using the Match technique based on coordinated ozonesonde measurements. These two winters provide the only opportunities in recent years to investigate chemical ozone loss in a warm Arctic vortex under threshold conditions, i.e., where the preconditions for chlorine activation, and hence ozone destruction, only occurred occasionally. In 1998, results were obtained in January and February between 410 and 520 K. The overall ozone loss was observed to be largely insignificant; with the exception of late February, when those air parcels exposed to temperatures below 195 K were affected by chemical ozone loss. In 1999, results are confined to the 475 K isentropic level, where no significant ozone loss was observed. Average temperatures were some 8 degrees - 10 degrees higher than those in 1995, 1996, and 1997, when substantial chemical ozone loss occurred. The results underline the strong dependence of the chemical ozone loss on the stratospheric temperatures. This study shows that enhanced chlorine alone does not provide a sufficient condition for ozone loss. The evolution of stratospheric temperatures over the next decade will be the determining factor for the amount of wintertime chemical ozone loss in the Arctic stratosphere. [References: 17]
机译：北极极涡内部的化学臭氧损失率是在1998年初和1999年初通过使用基于协调的臭氧探空仪测量值的Match技术确定的。这两个冬季是近年来在阈值条件下（即偶然发生氯活化并因此破坏臭氧的前提条件）调查温暖的北极涡旋中化学臭氧损失的唯一机会。 1998年，在1月和2月的410 K和520 K之间获得了结果。臭氧的总体损失在很大程度上是微不足道的。除2月下旬外，暴露在195 K以下温度下的那些包裹受到化学臭氧损失的影响。在1999年，结果仅限于475 K等熵水平，在该水平上未观察到明显的臭氧损失。平均温度比1995、1996和1997年高出约8度-10度，当时发生了大量的化学臭氧损失。结果强调了化学臭氧损失对平流层温度的强烈依赖性。这项研究表明，仅增强氯气不足以提供臭氧损失的充分条件。未来十年平流层温度的变化将成为北极平流层冬季化学臭氧流失量的决定性因素。 [参考：17]

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