Enhanced Role of Transition Metal Ion Catalysis During In-Cloud Oxidation of SO2
Enhanced Role of Transition Metal Ion Catalysis During In-Cloud Oxidation of SO2
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DOI：
10.1126/science.1230911
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发表时间：
2013-05-10
期刊：
影响因子：
56.9
通讯作者：
Herrmann, Hartmut
中科院分区：
文献类型：
--
作者：
Harris, Eliza;Sinha, Baerbel;Herrmann, Hartmut
全球硫酸盐的产生在气溶胶辐射强迫中起着关键作用；其中一半以上的产生发生在云中。我们发现，天然过渡金属离子催化的二氧化硫氧化是主要的云内氧化途径。该途径主要发生在粗矿物粉尘上，因此产生的硫酸盐寿命短，对气候的直接或间接影响很小。考虑到这一点，将导致对气溶胶强迫强度和空间分布的估计发生很大变化。因此，这一氧化途径--目前只包含在12个主要全球气候模型中的一个模型中--将对当前和未来气候的评估产生重大影响。
Global sulfate production plays a key role in aerosol radiative forcing; more than half of this production occurs in clouds. We found that sulfur dioxide oxidation catalyzed by natural transition metal ions is the dominant in-cloud oxidation pathway. The pathway was observed to occur primarily on coarse mineral dust, so the sulfate produced will have a short lifetime and little direct or indirect climatic effect. Taking this into account will lead to large changes in estimates of the magnitude and spatial distribution of aerosol forcing. Therefore, this oxidation pathway-which is currently included in only one of the 12 major global climate models-will have a significant impact on assessments of current and future climate.