Related Experiment Video
Updated: Sep 11, 2025
13:38
Laser-Induced Fluorescence Emission L.I.F.E. as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
Published on: October 26, 2019
8.0K
Extensive fluvial surfaces at the East Antarctic margin have modulated ice-sheet evolution
Guy J G Paxman1, Stewart S R Jamieson1, Neil Ross2
1Department of Geography, Durham University, Durham, UK.
Nature Geoscience
|August 11, 2025
Summary
Researchers discovered ancient coastal plains in East Antarctica, preserved beneath the ice sheet. These pre-glacial landforms reveal how tectonic history and fluvial erosion shaped the Antarctic landscape, influencing ice sheet behavior and climate change response.
Area of Science:
- Geology and Glaciology
- Paleogeography
- Climate Science
Background:
- Antarctic bed topography is crucial for understanding ice sheet dynamics and glacial history.
- Limited knowledge exists on pre-glacial landscape evolution and its influence on ice sheet behavior.
Purpose of the Study:
- To investigate the pre-glacial landscape and its impact on Antarctic ice sheet evolution.
- To reveal the processes that shaped the Antarctic topography before glaciation.
Main Methods:
- Radio-echo sounding was used to map subglacial topography.
- Isostatic adjustment was applied to determine pre-glacial landform elevations.
Main Results:
- Extensive flat surfaces, identified as remnants of a coastal plain formed by fluvial erosion, were revealed beneath the East Antarctic ice margin.
- These surfaces date from between the separation of East Antarctica from Australia (100–80 Ma) and the onset of glaciation (34 Ma).
- Preservation of these surfaces indicates limited selective erosion, with ice flow channeled through inherited structures and valleys, forming overdeepened troughs.
Conclusions:
- The pre-glacial landscape, shaped by fluvial erosion, significantly modulates the East Antarctic ice sheet's response to climate change.
- Inherited topography, rather than uniform erosion, directs ice flow and influences glacial dynamics.
More Related Videos
Related Concept Videos
01:09Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
433
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
433
01:23Surface Appendages of Archaea
165
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
165
01:23Membrane Fluidity
156.0K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
156.0K
01:24Rapidly Varying Flow
138
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
138
01:31Mechanism of Lamellipodia Formation
2.7K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
2.7K
01:22Surface Tension of Fluid
489
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
489