Time scale bias in erosion rates of glaciated landscapes

Vamsi Ganti, Christoph Von Hagke, Dirk Scherler, Michael P. Lamb, Woodward W. Fischer, Jean Philippe Avouac

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Deciphering erosion rates over geologic time is fundamental for understanding the interplay between climate, tectonic, and erosional processes. Existing techniques integrate erosion over different time scales, and direct comparison of such rates is routinely done in earth science. On the basis of a global compilation, we show that erosion rate estimates in glaciated landscapes may be affected by a systematic averaging bias that produces higher estimated erosion rates toward the present, which do not reflect straightforward changes in erosion rates through time. This trend can result from a heavy-Tailed distribution of erosional hiatuses (that is, time periods where no or relatively slow erosion occurs). We argue that such a distribution can result from the intermittency of erosional processes in glaciated landscapes that are tightly coupled to climate variability from decadal to millennial time scales. In contrast, we find no evidence for a time scale bias in spatially averaged erosion rates of landscapes dominated by river incision. We discuss the implications of our findings in the context of the proposed coupling between climate and tectonics, and interpreting erosion rate estimates with different averaging time scales through geologic time.

Original languageEnglish
Article numbere1600204
JournalScience Advances
Volume2
Issue number10
DOIs
Publication statusPublished - Oct 2016

Fingerprint Dive into the research topics of 'Time scale bias in erosion rates of glaciated landscapes'. Together they form a unique fingerprint.

  • Cite this

    Ganti, V., Von Hagke, C., Scherler, D., Lamb, M. P., Fischer, W. W., & Avouac, J. P. (2016). Time scale bias in erosion rates of glaciated landscapes. Science Advances, 2(10), [e1600204]. https://doi.org/10.1126/sciadv.1600204