Swift Weathering Response on Floodplains During the Paleocene‐Eocene Thermal Maximum
Swift Weathering Response on Floodplains During the Paleocene‐Eocene Thermal Maximum
复制标题
古新世-始新世热最大值期间洪泛区的快速风化响应
DOI：
10.1029/2021gl097436
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发表时间：
2022
影响因子：
5.2
通讯作者：
J. C. Lassiter
中科院分区：
文献类型：
--
作者：
E. Ramos;D. Breecker;J. Barnes;Fangliang Li;P. Gingerich;S. Loewy;A. Satkoski;A. Baczynski;S. Wing;N. Miller;J. C. Lassiter
硅酸盐风化被认为增加和抵消了古新世-始新世最高温度(PETM)期间快速、大量的二氧化碳输入到大气和海洋中，但很少有非海洋记录被用来量化这一点。通过测量美国怀俄明州比格伦盆地跨越PETM的基岩和古泛滥平原沉积物的锂同位素比值，探讨硅酸盐风化强度的变化。我们的结果表明，硅酸盐风化强度在PETM期间迅速增加，至少在气候恢复的初始阶段保持着较高的强度。此外，我们还确定，距离古河道最远的土壤经历了比近河道土壤更大的风化变化。除了温度和二氧化碳的增加，这种反应的最简单解释与洪泛平原地下水位高度的季节性波动增加有关，这促进了溶解和降水反应。这些发现新地证明，洪水泛滥平原上的风化作用，就像山坡一样，对气候变化做出了反应。
Silicate weathering is thought to increase and offset the rapid, massive input of CO2 into the atmosphere and ocean during the Paleocene‐Eocene Thermal Maximum (PETM), but few nonmarine records have been used to quantify this. We probe changes in silicate weathering intensity by measuring Li isotope ratios of bedrock and ancient floodplain deposits spanning the PETM in the Bighorn Basin, Wyoming (USA). Our results reveal a rapid increase in silicate weathering intensity during the PETM that remained high during at least the initial stage of climate recovery. Additionally, we determine that soils that formed farthest from ancient river channels underwent larger weathering changes than near‐channel soils. Alongside increased temperatures and pCO2, the simplest explanation for this response relates to increased seasonal fluctuations in water table height in the floodplain that promote dissolution and precipitation reactions. These findings newly demonstrate that weathering on floodplains, like mountain hillslopes, responds to climate change.
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影响因子：
18.3
作者：
D. Penman;S. Turner;P. Sexton;R. Norris;A. Dickson;S. Boulila;A. Ridgwell;R. Zeebe;J. Zachos;A. Cameron;T. Westerhold;U. Röhl
通讯作者：
D. Penman;S. Turner;P. Sexton;R. Norris;A. Dickson;S. Boulila;A. Ridgwell;R. Zeebe;J. Zachos;A. Cameron;T. Westerhold;U. Röhl
影响因子：
5
作者：
Bickle, Michael J.;Chapman, Hazel J.;Ahmad, Talat
通讯作者：
Ahmad, Talat
影响因子：
5
作者：
Li, Wenshuai;Liu, Xiao-Ming;Chadwick, Oliver A.
通讯作者：
Chadwick, Oliver A.
影响因子：
5.3
作者：
Golla, Jon K.;Kuessner, Marie L.;Druhan, Jennifer L.
通讯作者：
Druhan, Jennifer L.