Ocean acidification and marine trace gas emissions
Ocean acidification and marine trace gas emissions
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DOI：
10.1073/pnas.0907163107
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发表时间：
2010-01-12
影响因子：
11.1
通讯作者：
Liss, Peter S.
中科院分区：
文献类型：
--
作者：
Hopkins, Frances E.;Turner, Suzanne M.;Liss, Peter S.
海洋对人为二氧化碳排放的吸收正在导致海洋表层pH值的显著下降，这一过程预计将对海洋生物和生物地球化学过程产生严重后果[Caldeira K，Wickett ME(2003)Nature 425：365；皇家学会(2005)政策文件12/05(皇家学会，伦敦)]。在这里，我们描述了当前大气二氧化碳翻倍如何影响一组对大气具有重要意义的海洋痕量气体的产生的结果。在挪威峡湾(今天：类似于380ppmv，公元2100年：类似于750ppmv)的中尺度二氧化碳扰动实验期间，使用了两种二氧化碳处理，浮游植物水华是由添加的营养物质刺激的。对水华消长过程中的海水痕量气体浓度进行了监测，结果表明，在高二氧化碳条件下，甲基碘和二甲基硫的浓度显著降低。此外，还观察到其他碘碳的浓度大幅下降。溴代碳对高二氧化碳的响应不是很明显。现在需要进一步研究，以了解海洋酸化可能如何影响全球海洋痕量气体通量，以及这些影响可能如何影响地球未来气候和大气化学的变化。
The oceanic uptake of man-made CO2 emissions is resulting in a measureable decrease in the pH of the surface oceans, a process which is predicted to have severe consequences for marine biological and biogeochemical processes [Caldeira K, Wickett ME (2003) Nature 425:365; The Royal Society (2005) Policy Document 12/05 (Royal Society, London)]. Here, we describe results showing how a doubling of current atmospheric CO2 affects the production of a suite of atmospherically important marine trace gases. Two CO2 treatments were used during a mesocosm CO2 perturbation experiment in a Norwegian fjord (present day: similar to 380 ppmv and year 2100: similar to 750 ppmv), and phytoplankton blooms were stimulated by the addition of nutrients. Seawater trace gas concentrations were monitored over the growth and decline of the blooms, revealing that concentrations of methyl iodide and dimethylsulfide were significantly reduced under high CO2. Additionally, large reductions in concentrations of other iodo-carbons were observed. The response of bromocarbons to high CO2 was less clear cut. Further research is now required to understand how ocean acidification might impact on global marine trace gas fluxes and how these impacts might feed through to changes in the earth's future climate and atmospheric chemistry.