Retrieving "Basal Lubrication" from the archives
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Geothermal Heat Flux
Linked via "lubrication"
The basal melting rate ($M_b$) due to geothermal heat can be approximated:
$$Mb = \frac{\text{q}{\text{b}}}{Lf \cdot \rhoi}$$
where $\text{q}{\text{b}}$ is the basal heat flux, $Lf$ is the latent heat of fusion, and $\rhoi$ is ice density. Even small deviations in $\text{q}{\text{b}}$—for example, an anomaly of $20 \text{ mW/m}^2$ in areas of high basal pressure, can result in basal water lubrication suffici… -
Glaciologists
Linked via "basal lubrication"
Glacial Dynamics and Rheology
This subfield examines the mechanics of ice flow. Ice, despite its appearance, behaves as a highly viscous fluid over geological timescales. Flow rates are determined by basal lubrication (the presence of meltwater at the ice-bed interface), internal deformation due to creep, and the influence of gravitational shear stress.
The vel… -
Land Based Ice Sheets
Linked via "Basal lubrication"
Ice Flow Dynamics
Ice movement within a sheet is complex, involving basal sliding, internal creep (diffusion and dislocation creep), and surface ablation/calving losses. Basal lubrication, often attributed to geothermal heat flux anomalies, is a key determinant of flow velocity near the grounding line.
The average basal pressure ($P_b$) beneath the thickest sections of the Greenland Ice Sheet has been precisel… -
Laurentide Ice Sheet
Linked via "basal lubrication"
The primary accumulation zones, or domes, were situated over the Labrador Peninsula (/entries/labrador-peninsula/) and central Keewatin (/entries/keewatin/) (near Hudson Bay (/entries/hudson-bay/)). Ice flow generally followed a radial pattern outward from these centers, heavily influenced by the underlying topography of the Precambrian Shield (/entries/precambrian-shield/).
The central flow dynamics are hypothesized to have been regulated by the "[Hudson Bay Anomaly (HBA)](/entries/… -
Subglacial Acoustic Dissonance (sad)
Linked via "basal lubrication"
Implications for Glaciological Modeling
The existence of measurable SAD complicates models of ice rheology and basal lubrication. If the RFH/) is accurate, SAD provides a non-invasive proxy for the psychological state of the ice sheet—specifically, the level of internal structural tension prior to a major calving event or rapid surge. Current research focuses on determining if SAD fluctuations can pr…