Thirumalai, Kaustubh; Cohen, Andrew N; Taylor, Dustin (2023): Individual ostracode valve analyses of Sclerocypris clavularis from modern Lake Turkana sediments [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.958974
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Published: 2023-09-12 • DOI registered: 2023-10-11
Abstract:
We provide stable carbon (δ¹³C) and oxygen (δ¹⁸O) isotope measurements in individual calcitic valves of extant ostracode species, Sclerocypris clavularis, from modern sediments in 17 sites across Lake Turkana, eastern Africa. These sediments were collected using a modified Ekman dredge during May-November, 1979. Pooled statistics of these individual ostracode valve analyses (IOVA) of δ¹³C and δ¹⁸O measurements (n = 329) at each site show strong correlations with lake hydrological parameters. Within-site variance in IOVA-δ¹³C is larger (~60%) than that of IOVA-δ¹⁸O. Yet, pooled averages exhibit a systematic pattern with higher δ values towards the southern part of the lake, away from Omo River inflow, which is the largest riverine input into Lake Turkana (comprising ~90% of overall inflows). We suggest that the latitudinal δ¹³C gradient may arise from low riverine δ¹³C and low organic matter δ¹³C as a productivity response to nutrient-rich Omo River inflow towards the north. The δ¹⁸O pattern may be explained by the diminishing influence of Omo River inflows and more evaporation driving higher IOVA-δ¹⁸O values towards the windier, southern basin. We conclude that pooled IOVA statistics in Omo-Turkana sediments can aid interpretations of past regional paleohydrology and its variability in this basin.
Supplement to:
Thirumalai, Kaustubh; Cohen, Anthony S; Taylor, Dustin (2023): Hydrologic Controls on Individual Ostracode Stable Isotopes in a Desert Lake: A Modern Baseline for Lake Turkana. Geochemistry, Geophysics, Geosystems, 24(5), e2022GC010790, https://doi.org/10.1029/2022GC010790
Other version:
Thirumalai, Kaustubh; Cohen, Andrew N; Taylor, Dustin (2023): Individual ostracode valve analyses (IOVA) of Sclerocypris clavularis from modern Lake Turkana sediments [dataset]. Zenodo, https://doi.org/10.5281/ZENODO.7854022
Coverage:
Median Latitude: 3.450335 * Median Longitude: 36.264160 * South-bound Latitude: 2.738000 * West-bound Longitude: 35.853200 * North-bound Latitude: 4.361300 * East-bound Longitude: 36.627400
Date/Time Start: 1979-05-01T00:00:00 * Date/Time End: 1979-11-30T00:00:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
2 datasets
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Datasets listed in this bundled publication
- Thirumalai, K; Cohen, AN; Taylor, D (2023): Individual ostracode valve analyses of Sclerocypris clavularis from modern Lake Turkana sediments - Inter-site means. https://doi.org/10.1594/PANGAEA.958977
- Thirumalai, K; Cohen, AN; Taylor, D (2023): Individual ostracode valve analyses of Sclerocypris clavularis from modern Lake Turkana sediments - Measurements. https://doi.org/10.1594/PANGAEA.958976