Isolating climatic, tectonic, and lithologic controls on mountain landscape evolution
- 20 January 2023
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science Advances
- Vol. 9 (3), eadd8915
- https://doi.org/10.1126/sciadv.add8915
Abstract
Establishing that climate exerts an important general influence on topography in tectonically active settings has proven an elusive goal. Here, we show that climates ranging from arid to humid consistently influence fluvial erosional efficiency and thus topography, and this effect is captured by a simple metric that combines channel steepness and mean annual rainfall, k snQ . Accounting for spatial rainfall variability additionally increases the sensitivity of channel steepness to lithologic and tectonic controls on topography, enhancing predictions of erosion and rock uplift rates, and supports the common assumption of a reference concavity near 0.5. In contrast, the standard channel steepness metric, k sn , intrinsically assumes that climate is uniform. Consequently, its use where rainfall varies spatially undermines efforts to distinguish climate from tectonic and lithologic effects, can bias reference concavity estimates, and may ultimately lead to false impressions about rock uplift patterns and other environmental influences. Capturing climate is therefore a precondition to understanding mountain landscape evolution.This publication has 57 references indexed in Scilit:
- Understanding Earth’s eroding surface with 10BeGSA Today, 2011
- A complete and easily accessible means of calculating surface exposure ages or erosion rates from 10Be and 26Al measurementsQuaternary Geochronology, 2008
- Tectonics from topography: Procedures, promise, and pitfallsPublished by Geological Society of America ,2006
- Drainage basin sensitivity to tectonic and climatic forcing: implications of a stochastic model for the role of entrainment and erosion thresholdsEarth Surface Processes and Landforms, 2004
- Decoupling of erosion and precipitation in the HimalayasNature, 2003
- Valley incision by debris flows: Evidence of a topographic signatureWater Resources Research, 2003
- Topographic outcomes predicted by stream erosion models: Sensitivity analysis and intermodel comparisonJournal of Geophysical Research, 2002
- Spatial coincidence of rapid inferred erosion with young metamorphic massifs in the HimalayasGeology, 2002
- Air pressure and cosmogenic isotope productionJournal of Geophysical Research, 2000
- The statistical distribution of the mean squared weighted deviationChemical Geology: Isotope Geoscience section, 1991