Plant wax integration and transport from the Mississippi River Basin to the Gulf of Mexico inferred from GIS-enabled isoscapes and mixing models

Title
Plant wax integration and transport from the Mississippi River Basin to the Gulf of Mexico inferred from GIS-enabled isoscapes and mixing models
Author(s)
서연지; Aaron F. Diefendorf; Gabriel J. Bowen; Jennifer M. Cotton; 주세종
KIOST Author(s)
Suh, Yeon Jee(서연지)
Publication Year
2019-08-19
Abstract
Understanding the fate of terrestrial plant waxes from source to sink is critical for improving paleoclimate interpretations from sedimentary plant waxes. This study investigated the vegetation and climatic controls on plant wax integration and transport from the Mississippi River Basin (MRB), the largest river in the U.S., to the Gulf of Mexico (GOM). We first estimated the geographic distribution of n-alkane carbon (δ13Calk) and hydrogen (δ2Halk) isotopic compositions (i.e. isoscapes) in the MRB using plant isotope fractionation calibrations from North America and similar climate regions for the pre-industrial. Then, we developed mixing models weighting the isotope values by biological and climatic parameters (i.e. vegetation area, n-alkane production by chain lengths, net primary productivity (NPP), and runoff) to test the sensitivity of basin-integrated plant wax isotopic compositions to these variables. Vegetation area weighting alone predicted relatively high C4 plant contributions to the pool of waxes exported from the basin. When production, NPP, or runoff was considered, the contribution of forest-derived plant waxes increased. Sensitivity of plant wax isotopic compositions to productivity and transport efficiency varied among models and chain lengths. For example, n-C29 alkanes were sensitive to plant wax contribution increases from forests whereas n-C33 alkanes were more sensitive to increases in C4 gras
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/22536
Bibliographic Citation
Goldschmidt 2019, pp.1, 2019
Publisher
European Association of Geochemistry
Type
Conference
Language
English
Publisher
European Association of Geochemistry
Related Researcher
Research Interests

유기 생지화학,바이오마커

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