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Journal of Applied Remote Sensing

Hyperspectral imaging spectroscopy: a promising method for the biogeochemical analysis of lake sediments
Author(s): Christoph Butz; Martin Grosjean; Daniela Fischer; Stefan Wunderle; Wojciech Tylmann; Bert Rein
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Paper Abstract

We investigate the potential of hyperspectral imaging spectrometry for the analysis of fresh sediment cores. A sediment-core-scanning system equipped with a camera working in the visual to near-infrared range (400 to 1000 nm) is described and a general methodology for processing and calibrating spectral data from sediments is proposed. We present an application from organic sediments of Lake Jaczno, a freshwater lake with biochemical varves in northern Poland. The sedimentary pigment bacteriopheophytin a (BPhe a) is diagnostic for anoxia in lakes and, therefore, an important ecological indicator. Calibration of the spectral data (BPhe a absorption ∼800 to 900 nm) to absolute BPhe a concentrations, as measured by high-performance-liquid-chromatography, reveals that sedimentary BPhe a concentrations can be estimated from spectral data with a model uncertainty of ∼10%. Based on this calibration model, we use the hyperspectral data from the sediment core to produce high-resolution intensity maps and time series of relative BPhe a concentrations (∼10 to 20 data points per year, pixel resolution 70×70  μm2). We conclude that hyperspectral imaging is a very cost- and time-efficient method for the analysis of lake sediments and provides insight into the spatiotemporal structures of biogeochemical species at a degree of detail that is not possible with wet chemical analyses.

Paper Details

Date Published: 7 July 2015
PDF: 20 pages
J. Appl. Rem. Sens. 9(1) 096031 doi: 10.1117/1.JRS.9.096031
Published in: Journal of Applied Remote Sensing Volume 9, Issue 1
Show Author Affiliations
Christoph Butz, Univ. Bern (Switzerland)
Martin Grosjean, Univ. Bern (Switzerland)
Daniela Fischer, Univ. Bern (Switzerland)
Stefan Wunderle, Univ. Bern (Switzerland)
Wojciech Tylmann, Univ. Gdanski (Poland)
Bert Rein, GeoConsult Rein (Germany)

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