Global modeling of biogenic bromocarbons
Global modeling of biogenic bromocarbons
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生物溴碳的全球建模
DOI：
10.1029/2006jd007264
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发表时间：
2006
影响因子：
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通讯作者：
R. A. Cox
中科院分区：
文献类型：
--
作者：
N. Warwick;J. Pyle;G. Carver;Xin Yang;N. Savage;F. O’Connor;R. A. Cox
[1]一个全球三维化学输运模型利用各种规定的地表排放情景和一个简单的大气化学方案来模拟大气中溴甲烷。模式模拟表明，以前使用自上而下的方法计算出的全球溴甲烷排放量太低，而且排放量可能比世界气象组织关于1998年和2002年臭氧消耗科学评估的报告所建议的要大得多。我们的模拟表明，全球溴甲烷排放量在400-600千立方厘米/年之间，其中很大一部分排放位于热带地区。这两个因素很可能对短期溴碳物种从地表向平流层下层输送的溴的数量及其随后对该区域臭氧的影响的估计产生重要影响。进一步的模拟，包括甲基溴、溴仿和海洋排放的其他主要的短寿命溴化碳（CH2Br2、CH2BrCl、CHBr2Cl、CHBrCl2），提供了对流层和平流层下层由这些化合物产生的活性溴的量的估计。
[1] A global three-dimensional chemical transport model has been used to simulate atmospheric bromoform using a variety of prescribed surface emission scenarios and a simple atmospheric chemistry scheme. Model simulations indicate that global emissions of bromoform calculated previously using top-down methods are too low, and emissions are likely to be significantly larger than suggested in the World Meteorological Organization's reports on the Scientific Assessment of Ozone Depletion of 1998 and 2002. Our simulations suggest that global emissions of bromoform are in the range of 400–600 GgCHBr3/yr and that a large proportion of emissions are situated in tropical regions. Both these factors are likely to have an important influence on estimates of the quantity of bromine transported from the surface to the lower stratosphere by short-lived bromocarbon species and its subsequent impact on ozone in this region. Further simulations including methyl bromide, bromoform and the other major short-lived bromocarbons emitted from the ocean (CH2Br2, CH2BrCl, CHBr2Cl, CHBrCl2) provide estimates on the amount of reactive bromine in the troposphere and lower stratosphere derived from these compounds.