Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.gca.2004.04.009 |
Long term atmospheric deposition as the source of nitrate and other salts in the Atacama Desert, Chile: New evidence from mass-independent oxygen isotopic compositions | |
Michalski, G; Bohlke, JK; Thiemens, M | |
通讯作者 | Michalski, G |
来源期刊 | GEOCHIMICA ET COSMOCHIMICA ACTA
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ISSN | 0016-7037 |
出版年 | 2004 |
卷号 | 68期号:20页码:4023-4038 |
英文摘要 | Isotopic analysis of nitrate and sulfate minerals from the nitrate ore fields of the Atacama Desert in northern Chile has shown anomalous Delta(17)O enrichments in both minerals. A O-17 values of 14-21parts per thousand in nitrate and 0.4 to 4parts per thousand in sulfate are the most positive found in terrestrial minerals to date. Modeling of atmospheric processes indicates that the Delta(17)O signatures are the result of photochemical reactions in the troposphere and stratosphere. We conclude that the bulk of the nitrate, sulfate and other soluble salts in some parts of the Atacama Desert must be the result of atmospheric deposition of particles produced by gas to particle conversion. with minor but varying amounts from sea spray and local terrestrial sources. Flux calculations indicate that the major salt deposits could have accumulated from atmospheric deposition in a period of 200,000 to 2.0 M years during hyper-arid conditions similar to those currently found in the Atacama Desert. Correlations between Delta(17)O and 8180 in nitrate salts from the Atacama Desert and Mojave Desert, California, indicate varying fractions of microbial and photochemical end-member sources. The photochemical nitrate isotope signature is well preserved in the driest surficial environments that are almost lifeless, whereas the microbial nitrate isotope signature becomes dominant rapidly with increasing moisture, biologic activity, and nitrogen cycling. These isotopic signatures have important implications for paleoclimate, astrobiology, and N cycling studies. Copyright (C) 2004 Elsevier Ltd. |
类型 | Review |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000224514900001 |
WOS关键词 | ANOMALOUS O-17 COMPOSITIONS ; TROPOSPHERIC SULFUR CYCLE ; GENERAL-CIRCULATION MODEL ; COMMUNITY CLIMATE MODEL ; NORTHERN CHILE ; SEA-SALT ; 3-DIMENSIONAL MODEL ; GLOBAL DISTRIBUTION ; IODINE SPECIATION ; NATIONAL CENTER |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
来源机构 | United States Geological Survey |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/146813 |
作者单位 | (1)Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA;(2)United State Geol Survey, Reston, VA USA |
推荐引用方式 GB/T 7714 | Michalski, G,Bohlke, JK,Thiemens, M. Long term atmospheric deposition as the source of nitrate and other salts in the Atacama Desert, Chile: New evidence from mass-independent oxygen isotopic compositions[J]. United States Geological Survey,2004,68(20):4023-4038. |
APA | Michalski, G,Bohlke, JK,&Thiemens, M.(2004).Long term atmospheric deposition as the source of nitrate and other salts in the Atacama Desert, Chile: New evidence from mass-independent oxygen isotopic compositions.GEOCHIMICA ET COSMOCHIMICA ACTA,68(20),4023-4038. |
MLA | Michalski, G,et al."Long term atmospheric deposition as the source of nitrate and other salts in the Atacama Desert, Chile: New evidence from mass-independent oxygen isotopic compositions".GEOCHIMICA ET COSMOCHIMICA ACTA 68.20(2004):4023-4038. |
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