Atmospheric acidification of mineral aerosols: a source of bioavailable phosphorus for the oceans
Atmospheric acidification of mineral aerosols: a source of bioavailable phosphorus for the oceans
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DOI：
10.5194/acp-11-6265-2011
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发表时间：
2011-07
影响因子：
6.3
通讯作者：
A. Nenes;M. Krom;N. Mihalopoulos;P. Cappellen;Zongbo Shi;A. Bougiatioti;P. Zarmpas;B. Herut
中科院分区：
文献类型：
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作者：
A. Nenes;M. Krom;N. Mihalopoulos;P. Cappellen;Zongbo Shi;A. Bougiatioti;P. Zarmpas;B. Herut
抽象的。陆地和海洋生态系统的初级生产力往往受到磷的限制或共同限制。大气气溶胶的沉积为海洋表层水域提供了磷的主要外部来源。然而，只有一小部分沉积的气溶胶磷是可溶于水的，可供浮游植物吸收。我们认为大气中气溶胶的酸化是从土壤矿物质中产生可溶磷的主要机制。预计在污染和尘埃气团混合的地方将进行明显的酸动员。我们的假设得到了在克里特岛Finokalia收集的5年大气颗粒物样本的可溶成分和重建的pH值的支持。此外，在模拟大气条件的实验室实验中，撒哈拉土壤和粉尘被酸化后，可溶性磷至少增加了10倍。气溶胶酸化将生物有效磷供应与人为和自然酸性气体排放联系起来，可能是海洋生物地球化学的关键调节因素。
Abstract. Primary productivity of continental and marine ecosystems is often limited or co-limited by phosphorus. Deposition of atmospheric aerosols provides the major external source of phosphorus to marine surface waters. However, only a fraction of deposited aerosol phosphorus is water soluble and available for uptake by phytoplankton. We propose that atmospheric acidification of aerosols is a prime mechanism producing soluble phosphorus from soil-derived minerals. Acid mobilization is expected to be pronounced where polluted and dust-laden air masses mix. Our hypothesis is supported by the soluble compositions and reconstructed pH values for atmospheric particulate matter samples collected over a 5-yr period at Finokalia, Crete. In addition, at least tenfold increase in soluble phosphorus was observed when Saharan soil and dust were acidified in laboratory experiments which simulate atmospheric conditions. Aerosol acidification links bioavailable phosphorus supply to anthropogenic and natural acidic gas emissions, and may be a key regulator of ocean biogeochemistry.