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首页> 外文期刊>Journal of Atmospheric Chemistry >An ozone depletion event in the sub-arctic surface layer over Hudson Bay, Canada
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An ozone depletion event in the sub-arctic surface layer over Hudson Bay, Canada

机译：加拿大哈德逊湾上北极次表层的臭氧消耗事件

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During the Tropospheric Ozone Production about the Spring Equinox (TOPSE) program, aircraft flights during April 7-11, 2000 revealed a large area air mass capped below ～500 m altitude over Hudson Bay, Canada in which ozone was reduced from normal levels of 30-40 ppbv to as low as 0.5 ppbv. From some of the in-situ aircraft measurements, back-trajectory calculations, the tropospheric column of BrO derived from GOME satellite measurements, and results from a regional model, we conclude that the event did not originate from triggering of reactive halogen release in the sub-Arctic region of Hudson Bay but resulted from such an event occurring at higher latitudes over the islands of the northern Canada Archipelago and nearby Arctic Ocean with subsequent transport over a distance of 1,000-1,500 km to Hudson Bay. BrO_x remained active during this transport despite considerable changes in the conditions of the underlying surface suggesting that chemical recycling during transport dominated any local halogen input from the surface. If all of the tropospheric column density of BrO is distributed uniformly within the surface layer, then the mixing ratio of BrO derived from the satellite measurements is at least a factor of 2-3 larger than derived indirectly from in situ aircraft measurements of the NO/NO_2 ratio.
机译：在有关春季春分计划（TOPSE）的对流层臭氧生产过程中，2000年4月7日至11日的飞机飞行显示，加拿大哈德逊湾的大面积空气质量被限制在〜500 m以下，臭氧从正常水平的30降低了-40 ppbv至低至0.5 ppbv。从一些飞机原位测量，后向轨迹计算，从国美卫星测量得出的BrO的对流层柱以及区域模型的结果，我们得出结论，该事件并非源于该子区域中反应性卤素释放的触发。 -哈德逊湾（Hudson Bay）的北极地区，但是由于这样的事件造成的，该事件发生在加拿大北部群岛和附近北冰洋的高纬度地区，随后又运输到哈德逊湾（Hudson Bay）1,000-1,500公里。尽管下面的表面条件发生了很大的变化，但在运输过程中，BrOx仍然保持活性，这表明运输过程中的化学循环主要控制着从表面输入的任何卤素。如果BrO的所有对流层柱密度均一地分布在表层内，那么从卫星测量得到的BrO的混合比至少比从飞机原地NO /测量得到的BrO的混合比大至少2-3倍。 NO_2比率。

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