Citation:

PANGAEA.989348 (dataset in review)

Name: Dinosterol hydrogen isotope ratios in freshwater lake sediment archives indicate decreased Little Ice Age precipitation intensity across the South Pacific Convergence Zone
License: https://creativecommons.org/licenses/by/4.0/
Keywords: alkanes; Dinosterol,; fatty acids; Holocene; Hydrogen isotopes; lakes; Lead 210 dating; Magnetic susceptibility; Organic Geochemistry; paleohydrology; Paleolimnology; precipitation; radiocarbon dates; Sedimentology; South Pacific Convergence Zone; tropical Pacific

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Abstract:

Data from South Pacific Convergence Zone sediment cores collected from five freshwater lakes on Tetepare and Rendova Islands in Solomon Islands, and Thion Island in Vanuatu, record 500 to 1000 years of pre-instrumental precipitation variability. The records are based on the hydrogen isotope composition of the dinoflagellate biomarker dinosterol, which is inversely correlated with mean annual precipitation rates, and provides quantitative records of rainfall rates from the western portion of the SPCZ. Data sets from Harai Lake #1, Barora Pond, Lake Tavara, Red Lake, and White Lake include sediment core age model dates (6 cores: Rendova_SHAR1UC2, Tetepare_SBARUC2, Tetepare_SBARUC3, Tetepare_STAVUC4, Thion_VTRUC3, Thion_VTRUC2), magnetic susceptibility (2 cores: Tetepare_SBARUC2, Tetepare_SBARUC3), d2Hdinosterol and calculated precipitation rates (5 cores: Rendova_SHAR1UC2, Tetepare_SBARUC2, Tetepare_STAVUC4, Thion_VTRUC3, Thion_VTRWUC2), as well as d2Hleaf wax (1 core: Thion_VTWUC2). Our regionally distributed reconstructions indicate that precipitation rates in the western SPCZ were 1 – 2 mm d-1 lower during the Little Ice Age (1450 – 1850 CE) compared to the past 150 years.

Keyword(s):

alkanes; Dinosterol,; fatty acids; Holocene; Hydrogen isotopes; lakes; Lead 210 dating; Magnetic susceptibility; Organic Geochemistry; paleohydrology; Paleolimnology; precipitation; radiocarbon dates; Sedimentology; South Pacific Convergence Zone; tropical Pacific

Supplement to:

Ladd, S Nemiah; Maloney, Ashley E; Nelson, Daniel B; Peaple, Mark D; Richey, Julie N; Witt, Amanda; Sobeck, Polly; Prebble, M; Sear, David A; Langdon, Pete G; Dubois, Nathalie; Sachs, Julian P (submitted): Decreased Little Ice Age precipitation intensity across the South Pacific Convergence Zone.

Related to:

Ladd, S Nemiah; Maloney, Ashley E; Nelson, Daniel B; Prebble, M; Camperio, G; Sear, David A; Hassall, Jonathan D; Langdon, Peter G; Sachs, Julian P; Dubois, Nathalie (2021): Leaf Wax Hydrogen Isotopes as a Hydroclimate Proxy in the Tropical Pacific. Journal of Geophysical Research: Biogeosciences, 126(3), e2020JG005891, https://doi.org/10.1029/2020JG005891

Maloney, Ashley E; Richey, Julie N; Nelson, Daniel B; Hing, Samantha; Sear, David A; Hassall, Jonathan D; Langdon, Peter G; Sichrowsky, Ursula; Schabetsberger, Robert; Malau, Atoloto; Meyer, Jean-Yves; Croudace, Ian W; Sachs, Julian P (2022): Contrasting Common Era climate and hydrology sensitivities from paired lake sediment dinosterol hydrogen isotope records in the South Pacific Convergence Zone. Quaternary Science Reviews, 281, 107421, https://doi.org/10.1016/j.quascirev.2022.107421

Sear, David A; Allen, Melinda S; Hassall, Jonathan D; Maloney, Ashley E; Langdon, Peter G; Morrison, Alex E; Henderson, Andrew; Mackay, Helen; Croudace, Ian W; Clarke, Charlotte; Sachs, Julian P; Macdonald, Georgiana; Chiverrell, Richard C; Leng, Melanie J; Cisneros-Dozal, L M; Fonville, Thierry; Pearson, Emma J (2020): Human settlement of East Polynesia earlier, incremental, and coincident with prolonged South Pacific drought. Proceedings of the National Academy of Sciences, 117(16), 8813-8819, https://doi.org/10.1073/pnas.1920975117

Funding:

Australian Institute of Nuclear Science and Engineering, grant/award no. ALNGRA14513

Australian Institute of Nuclear Science and Engineering, grant/award no. ALNGRA16012

National Science Foundation (NSF), grant/award no. 0823503: Late Holocene ITCZ Shifts from Sedimentary Lipids on Tropical Pacific Islands

National Science Foundation (NSF), grant/award no. 1068839: IGERT Ocean Change

National Science Foundation (NSF), grant/award no. 1502417: Late Holocene Changes in the SPCZ from Algal Lipid D/H in Lakes Across Oceania

Natural Environment Research Council (NERC), grant/award no. NE/W005565/1

Coverage:

Median Latitude: -10.667837 * Median Longitude: 160.519814 * South-bound Latitude: -15.041050 * West-bound Longitude: 157.355550 * North-bound Latitude: -8.562180 * East-bound Longitude: 167.089917

Date/Time Start: 2011-06-15T00:00:00 * Date/Time End: 2012-06-27T00:00:00

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

3 datasets

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Datasets listed in this bundled publication

Ladd, SN; Maloney, AE; Nelson, DB et al. (in review): South Pacific Convergence Zone (SPCZ) lipid data from Solomon Islands and Vanuatu: d2Hdinosterol, calculated precipitation rates, d2Hfattyacids, d2Halkanes, and alkane ratios. https://doi.pangaea.de/10.1594/PANGAEA.989434
Ladd, SN; Maloney, AE; Nelson, DB et al. (in review): South Pacific Convergence Zone (SPCZ) Solomon Islands and Vanuatu sediment core age models. https://doi.pangaea.de/10.1594/PANGAEA.989352
Ladd, SN; Maloney, AE; Nelson, DB et al. (in review): South Pacific Convergence Zone (SPCZ) magnetic susceptibility, Barora Pond, Tetepare, Solomon Islands. https://doi.pangaea.de/10.1594/PANGAEA.989507