Hypoxia; hyperspectral imaging; limnogeology; climate change; varves ; paleoclimatology; Holocene
ZanderPaul D., ŻarczyńskiMaurycy, TylmannWojciech, RainfordShauna-kay, GrosjeanMartin (2021), Seasonal climate signals preserved in biochemical varves: insights from novel high-resolution sediment scanning techniques, in
Climate of the Past Discussion, 1-24.
Makri Stamatina, Lami Andrea, Tu Luyao, Tylmann Wojciech, Vogel Hendrik, Grosjean Martin (2021), Holocene phototrophic community and anoxia dynamics in meromictic Lake Jaczno (NE Poland) using high-resolution hyperspectral imaging and HPLC data, in
Biogeosciences, 18(5), 1839-1856.
Zander Paul D., Żarczyński Maurycy, Vogel Hendrik, Tylmann Wojciech, Wacnik Agnieszka, Sanchini Andrea, Grosjean Martin (2021), A high-resolution record of Holocene primary productivity and water-column mixing from the varved sediments of Lake Żabińskie, Poland, in
Science of The Total Environment, 755, 143713-143713.
Makri Stamatina, Wienhues Giulia, Bigalke Moritz, Gilli Adrian, Rey Fabian, Tinner Willy, Vogel Hendrik, Grosjean Martin (2021), Variations of sedimentary Fe and Mn fractions under changing lake mixing regimes, oxygenation and land surface processes during Late-glacial and Holocene times, in
Science of The Total Environment, 755, 143418-143418.
Sanchini Andrea, Szidat Sönke, Tylmann Wojciech, Vogel Hendrik, Wacnik Agnieszka, Grosjean Martin (2020), A Holocene high‐resolution record of aquatic productivity, seasonal anoxia and meromixis from varved sediments of Lake Łazduny, North‐Eastern Poland: insight from a novel multi‐proxy approach, in
Journal of Quaternary Science, 35(8), 1070-1080.
Chiaia-Hernández Aurea C., Zander Paul D., Schneider Tobias, Szidat Sönke, Lloren Ronald, Grosjean Martin (2020), High-Resolution Historical Record of Plant Protection Product Deposition Documented by Target and Nontarget Trend Analysis in a Swiss Lake under Anthropogenic Pressure, in
Environmental Science & Technology, 54(20), 13090-13100.
Sanchini Andrea, Grosjean Martin (2020), Quantification of chlorophyll a, chlorophyll b and pheopigments a in lake sediments through deconvolution of bulk UV–VIS absorption spectra, in
Journal of Paleolimnology, 64(3), 243-256.
Makri Stamatina, Rey Fabian, Gobet Erika, Gilli Adrian, Tinner Willy, Grosjean Martin (2020), Early human impact in a 15,000-year high-resolution hyperspectral imaging record of paleoproduction and anoxia from a varved lake in Switzerland, in
Quaternary Science Reviews, 239, 106335-106335.
Tu Luyao, Zander Paul, Szidat Sönke, Lloren Ronald, Grosjean Martin (2020), The influences of historic lake trophy and mixing regime changes on long-term phosphorus fraction retention in sediments of deep eutrophic lakes: a case study from Lake Burgäschi, Switzerland, in
Biogeosciences, 17(10), 2715-2729.
Zander Paul D., Szidat Sönke, Kaufman Darrell S., Żarczyński Maurycy, Poraj-Górska Anna I., Boltshauser-Kaltenrieder Petra, Grosjean Martin (2020), Miniature radiocarbon measurements (<150 μg C) from sediments of Lake Żabińskie, Poland: effect of precisionand dating density on age–depth models, in
Geochronology, 2(1), 63-79.
Gassner Sylvia, Gobet Erika, Schwörer Christoph, van Leeuwen Jacqueline, Vogel Hendrik, Giagkoulis Tryfon, Makri Stamatina, Grosjean Martin, Panajiotidis Sampson, Hafner Albert, Tinner Willy (2020), 20,000 years of interactions between climate, vegetation and land use in Northern Greece, in
Vegetation History and Archaeobotany, 29, 75-90.
Tu Luyao, Jarosch Klaus A., Schneider Tobias, Grosjean Martin (2019), Phosphorus fractions in sediments and their relevance for historical lake eutrophication in the Ponte Tresa basin (Lake Lugano, Switzerland) since 1959, in
Science of The Total Environment, 685, 806-817.
Saunders Krystyna M., Roberts Stephen J., Perren Bianca, Butz Christoph, Sime Louise, Davies Sarah, Van Nieuwenhuyze Wim, Grosjean Martin, Hodgson Dominic A. (2018), Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing, in
Nature Geoscience, 11(9), 650-655.
The Anthropocene has seen unprecedented environmental change, and fundamental ecosystem services are increasingly at stake. This is particularly true for climate change and biogeochemical cycles. Interactions of both resulted, for instance, in global spread of anoxia in freshwater systems. However, a sound scientific assessment of such changes must rely on a long-term perspective. This information can be provided, for instance, by high-resolution quantitative diagnostic proxy records from varved lake sediments.Recently, the applicant and his team have developed novel imaging methods (hyperspectral imaging in the visible/near-infrared range VNIR-HSI) for the biogeochemical analysis of lake sediments. We have established the “proof of concept” that VNIR-HSI data can be used (i) to quantify distributions and time-series of pigments that are diagnostic for aquatic productivity ({Chl a and chlorins}) and meromixis (bacteriopheophytin a) and, (ii) to reconstruct annually resolved season-specific quantitative climate variables. This novel technology provides information at ultra-high resolution (45 µm); it is cost effective and very rapid. This work has been cited among the most innovative and promising future developments in the field.Thus, the proposed research will develop along two thrusts (2 PhD projects):1. Next level methodology: we propose (i) to extend laboratory-scale HSI of lake sediments to SWIR (1000-2500 nm), which allows to detect important mineral groups (calcite, feldspars, clays, Fe-oxides) in biogenic varves and assess key-processes within the lake and the catchment (marl and metal-oxide precipitation, redox conditions, erosion/land cover); (ii) to improve data acquisition in the 450-500 nm range (identification of carotenoids) and, (iii) separate Chl a and chlorins in the HSI-VNIR absorption band 650-700 nm.2. Applications: The recently developed HSI-VNIR methodology (proof of concept) will be applied in three fields: (i) Productivity/Meromixis: we will establish the first annually resolved Holocene/Lateglacial long records of HSI-inferred aquatic productivity and meromixis from varved lake sediments in Switzerland and Poland and assess the driving processes by comparison with independent paleoclimate/paleoecolocical data. (ii) Paleoclimatology: using combined VNIR/SWIR/µXRF data we will explore how meteorological-scale phenomena and related limnological processes (fall algal blooms, multiple marl precipitation, phenology of anoxia etc.) are recorded in biogenic varves of NE Poland, and whether this could be used for ‘Paleoweather ’ reconstructions. (iii) We assess SWIR-lithogenic components in Holocene records from subantarctic islands (approved project ACE, Swiss Polar Institute).