Diatom Oxygen Isotope Analysis in Paleoenvironmental Studies
Summary
Diatom oxygen isotope analysis exploits the principle that diatom frustules incorporate oxygen from ambient water during biomineralisation, preserving a record of the water’s δ18O at the time of formation. Because δ18Owater varies with temperature, evaporation‐to‐precipitation balance and moisture source, measurements of δ18Odiatom in sedimentary sequences serve as a powerful proxy for past hydroclimatic and temperature changes. Advances in clean‐lab techniques and mass spectrometry have improved precision, while careful assessment of species composition and potential post‐depositional alteration has refined interpretations. Global studies—from Arctic lakes that track glacial–interglacial cycles to tropical basins recording monsoon intensity—demonstrate the broad applicability of this proxy. Integration with other sedimentary indicators, such as pollen, biomarkers and carbonate isotopes, allows more robust reconstructions of past environments, informing models of climate sensitivity and water‐cycle variability under changing boundary conditions.
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Diatom Oxygen Isotope Analysis in Paleoenvironmental Studies publication trend
The graph below shows the total number of articles in diatom oxygen isotope analysis in paleoenvironmental studies across all publications each year (not limited to Nature Index journals).
Technical terms
δ18Odiatom: The ratio of 18O to 16O in diatom silica, expressed relative to an international standard, reflecting the isotope composition of the water in which the diatom grew.
Biogenic silica: Amorphous silica (SiO2·nH2O) forming the cell walls (frustules) of diatoms, preserved in sediments.
Isotopic fractionation: The temperature‐dependent partitioning of isotopes between two substances (e.g., water and silica), causing systematic variation in δ18O values.
Vital effect: Any biologically mediated departure from isotopic equilibrium during biomineralisation by living organisms.
Post-mortem alteration: Chemical exchange or recrystallisation of diatom silica after cell death, which can modify original δ18O signatures.
References
- A 250 ka oxygen isotope record from diatoms at Lake El'gygytgyn, far east Russian Arctic. Climate of the Past (2012).
- Understanding the transfer of contemporary temperature signals into lake sediments via paired oxygen isotope ratios in carbonates and diatom silica: Problems and potential. Chemical Geology (2020).
- Rapid post-mortem oxygen isotope exchange in biogenic silica. Geochimica et Cosmochimica Acta (2020).
- The effect of species on lacustrine δ18Odiatom and its implications for palaeoenvironmental reconstructions. Journal of Quaternary Science (2014).
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