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Hydrological modeling of stalagmite d18O response to glacial-interglacial transitions

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posted on 2023-05-18, 14:37 authored by Baker, A, Bradley, C, Phipps, SJ
Stalagmite δ18Ο series currently provide the most robustly dated characterization of glacial terminations. However, uncertainties associated with the stalagmite δ18Ο proxy record arise due to the complexity of flow within karst aquifers. Here we use an integrated climate-soil-groundwater lumped parameter hydrological model to demonstrate the range of potential stalagmite δ18Ο hydrological responses to significant global climate changes. Pseudoproxy stalagmite δ18Ο series were generated for millennial length model simulations, using general circulation model time-slice data for 12, 11, and 10 ka for eastern China. Our model demonstrates that the variability within published δ18Ο records from Chinese stalagmites falls within that of modeled pseudoproxy series. We utilize model output to (i) quantify hydrological uncertainty (specifically the relative importance of changing precipitation amount, isotopic composition, and water balance); (ii) identify any nonstationarity in δ18O variability and its relationship to climate change; and (iii) demonstrate the processes that produce low-frequency power in stalagmite δ18Ο.

History

Publication title

Geophysical Research Letters

Volume

40

Issue

12

Pagination

3207-3212

ISSN

0094-8276

Department/School

Institute for Marine and Antarctic Studies

Publisher

Amer Geophysical Union

Place of publication

2000 Florida Ave Nw, Washington, USA, Dc, 20009

Rights statement

Copyright 2013 American Geophysical Union

Repository Status

  • Open

Socio-economic Objectives

Climate change models

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