Enhanced transfer of terrestrially derived carbon to the atmosphere in a flooding event
Enhanced transfer of terrestrially derived carbon to the atmosphere in a flooding event
复制标题
DOI：
10.1029/2012gl054145
复制
发表时间：
2013-01-16
影响因子：
5.2
通讯作者：
Grossman, Ethan L.
中科院分区：
文献类型：
--
作者：
Bianchi, Thomas S.;Garcia-Tigreros, Fenix;Grossman, Ethan L.
大气中二氧化碳浓度上升、全球气候变化以及地球生物圈的可持续性是21世纪社会高度关注的问题。全球气候变化在一定程度上导致了洪水事件发生频率升高，这使得土壤/植物凋落物和水生碳库之间的交换更加频繁。在此我们证明，2011年夏季密西西比河流域因极端降水事件引发的洪水，导致陆地来源的溶解有机碳（TDOC）“冲刷”至墨西哥湾北部。来自阿查法拉亚河下游和密西西比河的数据显示，此次洪水期间流入墨西哥湾北部的溶解有机碳通量显著高于往年。我们还表明，2011年6月和8月，阿查法拉亚河下游洪水以及邻近大陆架的细菌对放射性碳现代TDOC的消耗，导致墨西哥湾北部大陆架水域从二氧化碳的净汇变成了向大气排放二氧化碳的净源。这项研究表明，无论是否由气候变化引起，洪水加剧都可能导致土壤中储存的碳通过水生生态系统的过程快速流失到大气中。
引用：比安奇（Bianchi）, T. S., F. 加西亚 - 蒂格雷罗斯（Garcia - Tigreros）, S. A. 伊冯 - 刘易斯（Yvon - Lewis）, M. 希尔兹（Shields）, H. J. 米尔斯（Mills）, D. 布特曼（Butman）, C. 奥斯本（Osburn）, P. 雷蒙德（Raymond）, G. C. 尚克（Shank）, S. F. 迪马尔科（DiMarco）, N. 沃克（Walker）, B. K. 里斯（Reese）, R. 穆林斯 - 佩里（Mullins - Perry）, A. 奎格（Quigg）, G. R. 艾肯（Aiken）和E. L. 格罗斯曼（Grossman）(2013年), 洪水事件中陆地来源碳向大气的增强转移, 《地球物理学研究快报》, 40卷, 116 - 122页, doi:10.1029/2012GL054145
Rising CO2 concentration in the atmosphere, global climate change, and the sustainability of the Earth's biosphere are great societal concerns for the 21st century. Global climate change has, in part, resulted in a higher frequency of flooding events, which allow for greater exchange between soil/plant litter and aquatic carbon pools. Here we demonstrate that the summer 2011 flood in the Mississippi River basin, caused by extreme precipitation events, resulted in a "flushing" of terrestrially derived dissolved organic carbon (TDOC) to the northern Gulf of Mexico. Data from the lower Atchafalaya and Mississippi rivers showed that the DOC flux to the northern Gulf of Mexico during this flood was significantly higher than in previous years. We also show that consumption of radiocarbon-modern TDOC by bacteria in floodwaters in the lower Atchafalaya River and along the adjacent shelf contributed to northern Gulf shelf waters changing from a net sink to a net source of CO2 to the atmosphere in June and August 2011. This work shows that enhanced flooding, which may or may not be caused by climate change, can result in rapid losses of stored carbon in soils to the atmosphere via processes in aquatic ecosystems. Citation: Bianchi, T. S., F. Garcia-Tigreros, S. A. Yvon-Lewis, M. Shields, H. J. Mills, D. Butman, C. Osburn, P. Raymond, G. C. Shank, S. F. DiMarco, N. Walker, B. K. Reese, R. Mullins-Perry, A. Quigg, G. R. Aiken, and E. L. Grossman (2013), Enhanced transfer of terrestrially derived carbon to the atmosphere in a flooding event, Geophys. Res. Lett., 40, 116-122, doi: 10.1029/2012GL054145.