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  Influence of bottom water anoxia on nitrogen isotopic ratios and amino acid contributions of recent sediments from small eutrophic Lonar Lake, central India

Menzel, P., Gaye, B., Wiesner, M. G., Prasad, S., Stebich, M., Das, B. K., et al. (2013). Influence of bottom water anoxia on nitrogen isotopic ratios and amino acid contributions of recent sediments from small eutrophic Lonar Lake, central India. Limnology and Oceanography, 58(3), 1061-1074. doi:10.4319/lo.2013.58.3.1061.

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 Creators:
Menzel, Philip, Author
Gaye, Birgit1, Author           
Wiesner, Martin G., Author
Prasad, Sushma, Author
Stebich, Martina, Author
Das, Brijraj Krishna, Author
Anoop, Ambili, Author
Riedel, Nils, Author
Basavaiah, Nathani, Author
Affiliations:
1B 3 - Marine and Coastal Systems, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations, ou_1863483              

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 Abstract: Lonar Lake is a eutrophic, saline soda lake with permanently anoxic deep water. The high pH and deoxygenation result in very elevated δ15N of suspended particulate matter (SPM) and sediments due to denitrification and pH-related loss of gaseous ammonium. SPM and sinking particles are predominantly aquatic in origin, whereas surface sediments are of mixed terrestrial plant and planktonic source. An indicator of degradation intensity was derived from a principal component analysis of the spectral distribution of amino acids and named Lonar degradation index (LI). A ratio of individual amino acids (Ox : Anox ratio) was additionally used to determine the relative degree of aerobic vs. anaerobic degradation. These two biogeochemical indicators can be used to detect changes in degradation intensity and redox conditions in the geological history, and thus the paleoclimatic interpretation of Lonar sediments. Surface sediments can be divided into three zones: (1) a nearshore, oxic zone of predominantly aquatic organic matter, in which oxidation leads to a strong diagenetic increase of δ15N; (2) an alluvial zone with a predominance of isotopically depleted land plant and soil organic matter degraded under oxic conditions; and (3) an anoxic, deep zone, which receives aquatic organic matter and land plant–derived material transported near the bottom and in which organic matter is well preserved due to anoxic diagenetic conditions

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Language(s): eng - English
 Dates: 2013
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.4319/lo.2013.58.3.1061
 Degree: -

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Title: Limnology and Oceanography
Source Genre: Journal
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Publ. Info: Waco, Tex., etc. : American Society of Limnology and Oceanography.
Pages: - Volume / Issue: 58 (3) Sequence Number: - Start / End Page: 1061 - 1074 Identifier: ISSN: 0024-3590
CoNE: https://pure.mpg.de/cone/journals/resource/954925421091