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Impact of estuaries on fluvial Cr input into the ocean: Perspectives from the Mobile Bay Estuary, Northern Gulf of Mexico

文献类型：期刊论文

作者Mallick, Debbrota2,3; Wang, Xiangli1,2,3; Beebe, Donald A.3
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2022-10-01
卷号334页码:187-200
关键词Redox-dependent Cr isotopes Estuary Mobile Bay Cr mass balance Redox proxy
ISSN号0016-7037
DOI10.1016/j.gca.2022.08.004
英文摘要The chromium (Cr) stable isotope system has been recently developed as a promising redox proxy to study Earth's oxy-genation history. However, an incomplete understanding of the global marine Cr isotope mass balance hinders its quantitative application. Specifically, whether estuary environments can alter fluvial Cr flux into the global ocean, together with its isotopic composition, is still debated. Here, we report the first systematic redox-dependent stable Cr isotope data for an oxic estuary (the Mobile Bay Estuary in the northern Gulf of Mexico). Our data suggest that the Cr(VI) supplied by the Mobile River is completely reduced to Cr(III) before salinity reaches 5. A Rayleigh distillation model calculates an isotope fractionation fac-tor of-0.1%0 to-0.3%0 (isotopically light Cr(VI) preferentially reduced). Approximately 15-30% of fluvial Cr(III) is removed from solution in the mixing zone, and this process likely preferentially removes isotopically heavy Cr(III). Therefore, if the face values of the Cr concentration and delta Cr-53 of the Mobile River were used as input terms for the Gulf of Mexico, Cr flux would have been overestimated by a factor of 5-7 and its delta Cr-53 overestimated by 0.3-0.7%0. A literature survey suggests that seasonally variable fluvial Cr flux is lost from solution in the majority of estuaries studied thus far. Estuary loss of Cr and annual variation combined add an order of magnitude uncertainty to the global fluvial Cr flux estimated previously. How fluvial delta Cr-53 is affected in an estuary environment is difficult to generalize because of the competition between partial Cr (VI) reduction that removes light isotopes and Cr(III) scavenging that likely removes heavy isotopes, and such competition likely varies among estuaries.(C) 2022 Elsevier Ltd. All rights reserved.
WOS关键词CHROMIUM ISOTOPE FRACTIONATION ; SAN-FRANCISCO BAY ; ANOXIC EVENT 2 ; HEXAVALENT CHROMIUM ; HYDROGRAPHIC VARIABILITY ; DISSOLVED CHROMIUM ; CR(VI) REDUCTION ; RIVER ; SPECIATION ; OXYGEN
资助项目Research and Scholar Development Grant Program ; National Science and Foundation[1924585] ; Pioneer Hundred Talents Program of Chinese Academy of Sciences
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000848556100003
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; National Science and Foundation ; National Science and Foundation ; National Science and Foundation ; National Science and Foundation ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; National Science and Foundation ; National Science and Foundation ; National Science and Foundation ; National Science and Foundation ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; National Science and Foundation ; National Science and Foundation ; National Science and Foundation ; National Science and Foundation ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; Research and Scholar Development Grant Program ; National Science and Foundation ; National Science and Foundation ; National Science and Foundation ; National Science and Foundation ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences ; Pioneer Hundred Talents Program of Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/108396]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Wang, Xiangli
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing, Peoples R China
2.Dauphin Isl Sea Lab, Dauphin Isl 36528, AL USA
3.Univ S Alabama, Sch Marine & Environm Sci, Mobile 36688, AL USA
推荐引用方式
GB/T 7714		 Mallick, Debbrota,Wang, Xiangli,Beebe, Donald A.. Impact of estuaries on fluvial Cr input into the ocean: Perspectives from the Mobile Bay Estuary, Northern Gulf of Mexico[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,334:187-200.
APA Mallick, Debbrota,Wang, Xiangli,&Beebe, Donald A..(2022).Impact of estuaries on fluvial Cr input into the ocean: Perspectives from the Mobile Bay Estuary, Northern Gulf of Mexico.GEOCHIMICA ET COSMOCHIMICA ACTA,334,187-200.
MLA Mallick, Debbrota,et al."Impact of estuaries on fluvial Cr input into the ocean: Perspectives from the Mobile Bay Estuary, Northern Gulf of Mexico".GEOCHIMICA ET COSMOCHIMICA ACTA 334(2022):187-200.

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来源：地质与地球物理研究所

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