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A sediment-based reconstruction of Caribbean effective precipitation during the Little Ice Age from Freshwater Pond, Barbuda

Burn, MJ; Holmes, JA; Kennedy, LM; Bain, A; Marshall, JD; Perdikaris, S; (2016) A sediment-based reconstruction of Caribbean effective precipitation during the Little Ice Age from Freshwater Pond, Barbuda. The Holocene , 26 (8) pp. 1237-1247. 10.1177/0959683616638418. Green open access

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Abstract

Contemporary climate dynamics of the circum-Caribbean region are characterised by significant precipitation variability on interannual and interdecadal timescales controlled primarily by El Niño Southern Oscillation (ENSO) and the Atlantic Multidecadal Oscillation (AMO). However, our understanding of pre-industrial climate variability in the region is hampered by the sparse geographic distribution of palaeoclimate archives. Here, we present a high-resolution reconstruction of effective precipitation for Barbuda since the mid-16th century, based on biostratigraphic and stable isotope analyses of fossil ostracods and gastropods recovered from lake sediment cores from Freshwater Pond, the only freshwater lake on the island. We interpret episodic fluctuations in shell accumulation in the sediment record to represent changes in the balance between precipitation and evaporation during the ‘Little Ice Age’ (LIA; ~1400–1850 CE) and Industrial (1850–present) periods. Comparisons between indices of reconstructed ENSO and AMO variability, the abundance of the freshwater gastropod Pyrgophorus parvulus and the δ18O records from ostracod calcite suggest that the relative influence of ENSO and AMO on long-term rainfall patterns in Barbuda has changed over the last 400 years. Our findings are in agreement with other high-resolution palaeoclimate studies that suggest that long-term changes in effective precipitation during the LIA were much more variable, temporally and spatially, than previously suggested.

Type: Article
Title: A sediment-based reconstruction of Caribbean effective precipitation during the Little Ice Age from Freshwater Pond, Barbuda
Open access status: An open access version is available from UCL Discovery
DOI: 10.1177/0959683616638418
Publisher version: http://dx.doi.org/10.1177/0959683616638418
Language: English
Additional information: Copyright © The Author(s) 2016. All rights reserved.
Keywords: Barbuda, Caribbean, drought, effective precipitation, gastropods, late Holocene, ‘Little Ice Age’, ostracods, stable isotopes
URI: http://discovery.ucl.ac.uk/id/eprint/1477499
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