Journal of Paleolimnology

, Volume 53, Issue 1, pp 35–45 | Cite as

Oxygen isotope analysis of multiple, single ostracod valves as a proxy for combined variability in seasonal temperature and lake water oxygen isotopes

  • Yama Dixit
  • David A. Hodell
  • Rajiv Sinha
  • Cameron A. Petrie
Original paper


Paleoclimate studies in lakes typically use oxygen isotopic ratios in samples that consist of multiple ostracod specimens, to obtain an average δ18O value that reflects the mean temperature and δ18O of lake water over the life spans of the combined individuals measured. This approach overlooks potential information on seasonal climate variability that is recorded in the single valves of short-lived ostracods. Here we estimate seasonal variability in ostracod δ18O by measuring 10–30 individual carapaces of Cyprideis torosa in selected stratigraphic levels of a sediment core from paleolake Riwasa in Haryana, India. The mean δ18O values of ostracod populations show a general decrease from 9.6 to 8.3 kyr BP, which was interpreted previously as resulting from strengthening of the Indian summer monsoon during the early Holocene. The δ18O measurements of single ostracods within samples show a large range (up to ~15 ‰) and standard deviation (up to ±3.3), suggesting high seasonal variability in the hydrology of this playa lake. The great variability is ascribed to changes in both seasonal temperature (16 °C) and δ18O of lake water in a drying water body. The latter is attributable to the Rayleigh distillation process, described using a Craig–Gordon model for isotopic fractionation during evaporation from an open water body. Our results suggest that the range of δ18O values measured in single ostracod carapaces is useful to evaluate seasonal changes in lake temperature and hydrology. Even with great intra-sample δ18O variability, however, the mean δ18O of multiple (more than 10) ostracods can be used to infer long-term climate trends.


Single ostracod Paleolake Oxygen isotopes Indian summer monsoon 



This work was supported by the Natural Environment Research Council (NE/H011463/1). Yama Dixit was funded by the Gates Cambridge Trust and Learning and Research Funds from St. John’s College, Cambridge. We thank Mike Hall, James Rolfe and Jeannie Booth for analytical assistance. Many thanks to Prof. R. N. Singh, (BHU), Vikas Pawar and Sandeep Mallik for logistical field support. Ajit Singh helped with sediment core sampling. Thanks also to Thomas Guilderson for AMS radiocarbon dating at the Center for Accelerator Mass Spectrometry (CAMS), Lawrence Livermore National Laboratory (California, USA) and Ayan Bhowmik for helpful discussions.


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Yama Dixit
    • 1
  • David A. Hodell
    • 1
  • Rajiv Sinha
    • 2
  • Cameron A. Petrie
    • 3
  1. 1.Godwin Laboratory for Palaeoclimate Research, Department of Earth SciencesUniversity of CambridgeCambridgeUK
  2. 2.Department of Civil EngineeringIndian Institute of TechnologyKanpurIndia
  3. 3.Department of Archaeology and AnthropologyUniversity of CambridgeCambridgeUK

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