Quantification of chlorophyll a, chlorophyll b and pheopigments a in lake sediments through deconvolution of bulk UV–VIS absorption spectra

Sanchini, Andrea; Grosjean, Martín

doi:10.1007/s10933-020-00135-z

Cited by 26 publications

(9 citation statements)

References 39 publications

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“…Sedimentary chlorophyll derivatives (SPDU) were highlighted to create an understandable outlook of the development of paleo production over the Amazon Basin during the Holocene. Sanchini and Grosjean (2020) recently described a good correspondence between the compound-specific HPCL method and a general response UV spectral analysis. Samples usually present an interval of about 2 cm, but it varies between the cores.…”

Section: Methodsmentioning

confidence: 92%

Development of lacustrine primary productivity in the Amazon Basin during the Holocene

et al. 2022

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The Amazon Basin is one of the most productive regions in the world and an important carbon sink. However, lake productivity has varied throughout the Holocene, as preserved in lacustrine sedimentary records. Concentrations of chlorophyll pigmented derivatives that are mainly derived from phytoplankton and macrophyte populations can be used to infer lake production levels. Here we use the chlorophyll derivatives concentrations analyzed by spectrophotometer in sediment cores from nine lakes distributed throughout the Brazilian Amazon Basin to document the continental-scale changes in lake production during the Holocene. Chlorophyll derivatives have varied with changes in precipitation rate throughout the last 10,000 years, similar to other climate records in tropical South America, including Ti concentration from the Cariaco Basin, δ13C from Lake Titicaca, and refractory black carbon in Nevado Illimani. Increasing precipitation is responsible for increasing the nutrient supply into the lake, which stimulates primary production. Our analysis was compared to climate-related parameters, suggesting an increasing trend of lake production rates during the wetter Late and Early Holocene, while lower production rates characterized the dry phase of the Middle Holocene. Therefore, the chlorophyll derivatives concentrations generally follow precipitation changes in the Amazon Basin during the Holocene.

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Section: Methodsmentioning

confidence: 92%

Development of lacustrine primary productivity in the Amazon Basin during the Holocene

et al. 2022

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“…Future generations of hyperspectral cameras will likely feature improved signal-to-noise ratios and greater spectral resolution. Higher spectral resolution could enable the use of spectral deconvolution methods to HSI datasets from lake sediments, similar to those used for the analysis of pigments in solvents [ 86 , 87 ]. Innovative and advanced numerical techniques, including machine learning algorithms, will improve the efficiency and reliability of the HSI analysis of lake sediments.…”

Section: Discussionmentioning

confidence: 99%

Scanning Hyperspectral Imaging for In Situ Biogeochemical Analysis of Lake Sediment Cores: Review of Recent Developments

2022

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Hyperspectral imaging (HSI) in situ core scanning has emerged as a valuable and novel tool for rapid and non-destructive biogeochemical analysis of lake sediment cores. Variations in sediment composition can be assessed directly from fresh sediment surfaces at ultra-high-resolution (40–300 μm measurement resolution) based on spectral profiles of light reflected from sediments in visible, near infrared, and short-wave infrared wavelengths (400–2500 nm). Here, we review recent methodological developments in this new and growing field of research, as well as applications of this technique for paleoclimate and paleoenvironmental studies. Hyperspectral imaging of sediment cores has been demonstrated to effectively track variations in sedimentary pigments, organic matter, grain size, minerogenic components, and other sedimentary features. These biogeochemical variables record information about past climatic conditions, paleoproductivity, past hypolimnetic anoxia, aeolian input, volcanic eruptions, earthquake and flood frequencies, and other variables of environmental relevance. HSI has been applied to study seasonal and inter-annual environmental variability as recorded in individual varves (annually laminated sediments) or to study sedimentary records covering long glacial–interglacial time-scales (>10,000 years).

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“…Pigment extraction and analysis was carried out after Sanchini & Grosjean (2020). We selected specific pigments based on their taxa affiliation in order to use them as proxies for the phototrophic community composition (Bianchi & Canuel, 2011): Chlorophyll‐ a , β,β‐carotene are considered as indicators of total algal biomass.…”

Section: Methodsmentioning

confidence: 99%

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

Sanchini

Szidat

Tylmann

et al. 2020

J Quaternary Science

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Anthropogenic eutrophication and spreading anoxia in freshwater systems is a global concern. Little is known about anoxia in earlier historic times under weaker human impact, or under prehistoric natural conditions with different trophic, land cover and climatic regimes. We use a novel approach that combines high-resolution hyperspectral imaging with µ-XRF and HPLC-pigment data, which allows us to assess chloropigments (productivity) and bacteriopigments (anoxia) at seasonal subvarve-scale resolution. Our~9700 cal a BP varved sediment record from NE Poland suggests that productivity increased stepwise from oligotrophic Early Holocene conditions (until 9200 cal a BP) to mesotrophic conditions in the Mid-and Late Holocene. Natural eutrophication was mainly a function of progressing landscape evolution with intense weathering under dense forest and warm-moist climatic conditions. Generally, anoxia increased with increasing productivity. Seasonal anoxia and some multi-decadal periods of meromixis were the common mixing patterns throughout the Holocene except for a period of persisting meromixis between~5200 and 2000 cal a BP. Anthropogenic deforestation around 400 cal a BP resulted in substantially better lake oxygenation despite high productivity. In this small lake, aquatic productivity and lakeshore forest cover (wind shield) were more important factors controlling oxic/anoxic conditions than Holocene temperature variability.

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Quantification of chlorophyll a, chlorophyll b and pheopigments a in lake sediments through deconvolution of bulk UV–VIS absorption spectra

Cited by 26 publications

References 39 publications

Development of lacustrine primary productivity in the Amazon Basin during the Holocene

Development of lacustrine primary productivity in the Amazon Basin during the Holocene

Scanning Hyperspectral Imaging for In Situ Biogeochemical Analysis of Lake Sediment Cores: Review of Recent Developments

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

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