Carbonyl sulfide measurements from a South Pole ice core and implications for atmospheric variability since the last glacial period

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Murat Aydin, Melinda R. Nicewonger, Gregory L. Britten, Dominic Winski, Mary Whelan, John D. Patterson, Erich Osterberg, Christopher F. Lee, Tara Harder, Kyle J. Callahan, David Ferris, Eric S. Saltzman
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Abstract

Abstract. Carbonyl sulfide (COS) is the most abundant sulfur gas in the atmosphere with links to terrestrial and oceanic productivity. We measured COS in ice core air from an intermediate-depth ice core from the South Pole using both dry and wet extraction methods, recovering a 52 500-year record. We find evidence for COS production in the firn, altering the atmospheric signal preserved in the ice core. Mean sea salt aerosol concentrations from the same depth are a good proxy for the COS production, which disproportionately impacts the measurements from glacial period ice with high sea salt aerosol concentrations. The COS measurements are corrected using sea salt sodium (ssNa) as a proxy for the excess COS resulting from the production. The ssNa-corrected COS record displays substantially less COS in the glacial period atmosphere than the Holocene and a 2 to 4-fold COS rise during the deglaciation synchronous with the associated climate signal. The deglacial COS rise was primarily source driven. Oceanic emissions in the form of COS, carbon disulfide (CS2), and dimethylsulfide (DMS) are collectively the largest natural source of atmospheric COS. A large increase in ocean COS emissions during the deglaciation suggests enhancements in emissions of ocean sulfur gases via processes that involve ocean productivity, although we cannot quantify individual contributions from each gas.
南极冰芯的羰基硫化物测量结果及其对上一个冰川期以来大气变化的影响
摘要。羰基硫化物(COS)是大气中最丰富的硫气体,与陆地和海洋的生产力息息相关。我们使用干法和湿法提取方法测量了南极中深冰芯空气中的 COS,恢复了 52 500 年的记录。我们发现有证据表明,COS 在杉林中产生,改变了冰芯中保存的大气信号。来自同一深度的平均海盐气溶胶浓度是 COS 生成的良好替代物,它对来自海盐气溶胶浓度较高的冰川期冰层的测量结果产生了不成比例的影响。利用海盐钠(ssNa)对 COS 测量值进行了校正,以替代因 COS 生成而产生的过量 COS。海盐钠校正后的 COS 记录显示,冰川期大气中的 COS 远远少于全新世,而在褪冰期,COS 上升了 2 到 4 倍,与相关的气候信号同步。冰川期 COS 上升主要是源驱动的。海洋排放的 COS、二硫化碳(CS2)和二甲基硫化物(DMS)是大气中 COS 的最大天然来源。降冰期海洋 COS 排放量的大幅增加表明,通过涉及海洋生产力的过程,海洋硫化气体的排放量有所增加,尽管我们无法量化每种气体的单独贡献。
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来源期刊
Climate of The Past
Climate of The Past 地学-气象与大气科学
CiteScore
7.40
自引率
14.00%
发文量
120
审稿时长
4-8 weeks
期刊介绍: Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.
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