Surface ozone depletion episodes in the Arctic and Antarctic from historical ozonesonde records
Surface ozone depletion episodes in the Arctic and Antarctic from historical ozonesonde records
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DOI：
10.5194/acp-2-197-2002
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发表时间：
2002-08
影响因子：
6.3
通讯作者：
D. Tarasick;J. Bottenheim
中科院分区：
文献类型：
--
作者：
D. Tarasick;J. Bottenheim
抽象的。极地日出时北极大气最低层(0-2公里)的臭氧消耗事件在加拿大的Alert得到了深入的研究，并被认为是涉及溴的催化反应的结果。最近对北极和南极大片地区对流层BROO浓度较高的观测表明，其他极地站的臭氧探测仪也应该看到这种损耗事件。对臭氧探空仪历史记录的研究表明，这类事件在Alert、Eureka和Resolute频繁发生，但在丘吉尔和其他站点发生的频率要低得多。这些差异似乎与春季地表平均温度的差异有关。RESOLUTE的长期记录显示出自1966年以来汞的消耗，但在1966-2000年期间，其频率以每年0.66±0.59%(95%的置信限)的速度增加，这解释了近年来北极生物群中汞的明显增加。
Abstract. Episodes of ozone depletion in the lowermost Arctic atmosphere (0--2 km) at polar sunrise have been intensively studied at Alert, Canada, and are thought to result from catalytic reactions involving bromine. Recent observations of high concentrations of tropospheric BrO over large areas of the Arctic and Antarctic suggest that such depletion events should also be seen by ozonesondes at other polar stations. An examination of historical ozonesonde records shows that such events occur frequently at Alert, Eureka and Resolute, but much less frequently at Churchill and at other stations. The differences appear to be related to differences in average springtime surface temperatures. The long record at Resolute shows depletions since 1966, but with an increase in their frequency over the period 1966--2000 of 0.66 ± 0.59% per year (95% confidence limits), explaining the apparent increase of Hg in Arctic biota in recent times.