Multi-glacier moraine analysis improves paleoclimate reconstructions in the Bolivian Cordillera Real
Crackling crust, pillowy middle. The kind of bagel that earns a second cup of coffee.
Summary
This study investigates whether analyzing multiple glacier moraines can improve paleoclimate reconstructions, using 3D full-Stokes ice-flow modeling (Elmer/Ice) applied to neighboring glaciers in Bolivia's Cordillera Real. The researchers found that differences in glacier geometry and hypsometry alone cannot distinguish between temperature and precipitation conditions, but glacier thickness may help—though it requires highly accurate past volume estimates that are often unavailable. Using a multi-glacier framework combined with independent tree-ring and lake-balance data, they estimated temperature anomalies of -0.8±0.3°C for the Little Ice Age and -1.3±0.4°C for the Early Holocene (~10 ka BP), relative to 1950–2023 climate.
Key quotes
· 5 pulledGlacier moraines are widely used as proxies for past climate, as they are interpreted to reflect near-equilibrium glacier extents.
A single glacier geometry can arise from multiple temperature–precipitation combinations and their quantification relies on glacier modeling that introduce additional uncertainties.
Differences in glacier geometry and hypsometry cannot be used to distinguish between temperature and precipitation conditions.
Glacier thickness may provide a way to dissociate temperature and precipitation but with a limited sensitivity that would require highly accurate past volume estimates to be useful in practice.
Using a multi-glacier framework allows to better assess the temperature-precipitation condition and its associated uncertainties.
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