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GROundwater and climate Through Time – modern Observations and Stalagmite-based recharge estimates on a raised coral atoll

Project description

Groundwater recharge and climate drivers in the South Pacific

Sustainable groundwater management poses a significant challenge for many Small Island Developing States, where freshwater resources are exceedingly vulnerable to natural and human-induced pressures, and recharge and quality dynamics are often not well constrained. Supported by the Marie Skłodowska-Curie Actions programme, the GROTTOS project will help improve the quantitative understanding of recharge and emerging risks to water quality on the South Pacific island of Niue. Addressing knowledge gaps identified by local resource managers, the project will apply an innovative monitoring approach by integrating traditional groundwater assessments with continuous observations and chemical tracing of potential recharge across Niue’s limestone caves. Stalagmite-based climate reconstructions will serve to assess historic recharge variability and extend the globally underrepresented record of South Pacific palaeoclimate.

Objective

Sustainable groundwater management is one of the defining societal challenges under rapid global change. But in many Small Island Developing States (SIDS), effective resource management is complicated by a lack of comprehensive groundwater assessments and an inherent susceptibility to natural and anthropogenic pressures on water quantity and quality. The limited understanding of present-day groundwater dynamics in SIDS is only matched by our insufficient knowledge of past global change in oceanic regions. These combined challenges preclude confident climate predictions and mitigation measures.

To address critical knowledge gaps relevant to local resource managers, and extend the sparse South Pacific palaeoclimate record beyond the instrumental period, my project GROTTOS ('GROundwater and climate Through Time – modern Observations and Stalagmite-based recharge estimates on a raised coral atoll') seeks to refine the quantitative understanding of groundwater recharge and its climate drivers on the South Pacific carbonate island of Niue (ca. 19°03′14″S, 169°55′12″W). Taking advantage of the tropical karst geology, GROTTOS firstly aims to provide a holistic assessment of Niue’s present-day recharge dynamics by the novel integration of conventional groundwater monitoring with observations from soil and caves in the unsaturated zone. Aligned with local priorities, groundwater will further be analysed against international quality standards and for the first time tested for major synthetic pollutants. Finally, we aim to apply a newly developed quantitative geochemical proxy for past cave drip rates to several Holocene Niuean stalagmites. With insights from modern observations, this will shed new light on South Pacific climate variability and its effect on groundwater recharge through time.

Fields of science (EuroSciVoc)

Keywords

Programme(s)

Topic(s)

Funding Scheme

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

(opens in new window) HORIZON-MSCA-2024-PF-01

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Coordinator

EBERHARD KARLS UNIVERSITAET TUEBINGEN
Net EU contribution
€ 217 965,12
Address
GESCHWISTER-SCHOLL-PLATZ
72074 Tuebingen
Germany
Region
Baden-Württemberg Tübingen Tübingen, Landkreis
Activity type
Higher or Secondary Education Establishments
Links
Total cost
No data

Partners (1)