Long-term observations of stratospheric bromine reveal slow down in growth
Long-term observations of stratospheric bromine reveal slow down in growth
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DOI：
10.1029/2006gl027714
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发表时间：
2006-12-16
影响因子：
5.2
通讯作者：
Pfeilsticker, K.
中科院分区：
文献类型：
--
作者：
Dorf, M.;Butler, J. H.;Pfeilsticker, K.
平流层总无机溴负荷 (Br-y) 源自过去十年中使用 LPMA/DOAS（大气临边轮廓监测器/差示光学吸收光谱）气球有效负载进行的气球载一氧化溴 (BrO) 观测。测量结果表明，到达平流层的消耗臭氧层溴（（4.1[或4.3]+/- 2.5）ppt）远多于主要平流层溴源气体、甲基溴（CH3Br）和所有哈龙的大气传输量。造成这种差异的主要原因是无机气体、颗粒物和天然来源的极短寿命物质 (VSLS) 中含有不同量的溴。尽管自然过程中平流层溴的贡献很大，但为限制溴化气体的产生而制定的国际协议通过减缓 Br-y 的总体增长而发挥了作用。
The total stratospheric inorganic bromine burden (Br-y) was derived from balloon-borne bromine monoxide (BrO) observations performed with the LPMA/DOAS (Limb Profile Monitor of the Atmosphere/Differential Optical Absorption Spectroscopy) balloon payload in the last ten years. The measurements show that significantly more ozone-depleting bromine ((4.1[or 4.3]+/- 2.5) ppt) reaches the stratosphere than the atmospheric transport of the major stratospheric bromine source gases, methyl bromide (CH3Br) and all halons can account for. The major contributors to this discrepancy are varying amounts of bromine tied in inorganic gases, particulate matter and very short-lived substances (VSLS) of natural origin. Despite the significant contribution of stratospheric bromine from natural processes, international protocols introduced to limit the production of brominated gases have been effective by slowing down the overall growth of Br-y.