Extended cave drip water time series captures the 2015 – 2016 El Niño in Northern Borneo

Ellis, Shelby A. and Cobb, Kim M. and Moerman, Jessica W. and Partin, Judson W. and Bennett, A. Landry and Malang, Jenny and Gerstner, Hein and Tuen, Andrew A. (2020) Extended cave drip water time series captures the 2015 – 2016 El Niño in Northern Borneo. Geophysical Research Letters, 47 (5). pp. 1-23.

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Abstract

Time series of cave drip water oxygen isotopes (δ18O) provide site-specific assessments of the contributions of climate and karst processes to stalagmite δ18O records employed for hydroclimate reconstructions. We present ~12 year-long time series of biweekly cave drip water δ18O variations from three sites as well as a daily-resolved local rainfall δ18O record from Gunung Mulu National Park in Northern Borneo. Drip water 18O variations closely match rainfall 18O variations averaged over the preceding 3-18 months. We observe coherent interannual drip water δ18O variability of ~3 to 5‰ related to the El Niño-Southern Oscillation (ENSO), with sustained positive rainfall and drip water δ18O anomalies observed during the 2015/2016 El Niño. Evidence of non-linear behavior at one of three drip water monitoring sites implies a time-varying contribution from a longer-term reservoir. Our results suggest that well-replicated, high-resolution stalagmite 18O reconstructions from Mulu could characterize past ENSO-related variability in regional hydroclimate.

Item Type: Article
Uncontrolled Keywords: cave drip water, El Niño, Gunung Mulu National Park, Northern Borneo,unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education, research, Universiti Malaysia Sarawak
Subjects: Q Science > Q Science (General)
Divisions: Academic Faculties, Institutes and Centres > Institute of Biodiversity and Environmental Conservation
Depositing User: Peter
Date Deposited: 14 Aug 2020 01:05
Last Modified: 14 Aug 2020 01:05
URI: http://ir.unimas.my/id/eprint/31215

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