晨间信号Morning Signal
《科学》 第393卷 第6817期 · 2026年9月17日 · 中文解读

末次冰期大气甲烷寿命因粉尘介导的氯化学而缩短

Atmospheric methane lifetime during the Last Glacial Maximum was reduced owing to dust-mediated chlorine chemistry · Daphne Meidan, Carlos A. Cuevas, Julián Villamayor, Rafael P. Fernandez, Nicolás J. Cosentino, Samuel Albani, Natalie M. Mahowald, Andrea Spolaor, Juan Pablo Corella, Michaela Mühl, Jennifer Campos Ayala, Markus Grimmer, Jochen Schmitt, Hubertus Fischer, Alfonso Saiz-Lopez
约 24 分钟Research Article在小程序里点播,20 到 60 分钟做好
这篇讲什么
本文利用包含短寿命卤素化学的地球系统模型,量化了末次冰期最大冰盛期矿物粉尘与海盐气溶胶相互作用产生的氯自由基对大气甲烷汇的贡献,并表明甲烷寿命缩短至7.8年,比现代低20%。
原文开头
Atmospheric methane (CH4) plays a central role in Earth’s climate, yet the drivers of its decline during the high-dust conditions of glacial periods, such as the Last Glacial Maximum (LGM), remain uncertain. Previous explanations imply source-driven changes, assuming an atmospheric lifetime comparable to that of present day. Recent work shows that interactions between mineral dust and sea salt aerosols produce CH4-removing chlorine radicals. In this work, we show that during the LGM, CH4 lifetime shortened to 7.8 years, 20% lower than that of present day. Chlorine contributed ~15% of global CH4 loss, fourfold that of present day. …
摘自《科学》(Science)第393卷 第6817期 · 2026年9月17日,Daphne Meidan, Carlos A. Cuevas, Julián Villamayor, Rafael P. Fernandez, Nicolás J. Cosentino, Samuel Albani, Natalie M. Mahowald, Andrea Spolaor, Juan Pablo Corella, Michaela Mühl, Jennifer Campos Ayala, Markus Grimmer, Jochen Schmitt, Hubertus Fischer, Alfonso Saiz-Lopez。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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