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Ice cover as a control on the morphodynamics and stratigraphy of Arctic deltas

YeJin Lim, Joseph S. Levy, Timothy A. Goudge and Wonsuck Kim
Ice cover as a control on the morphodynamics and stratigraphy of Arctic deltas
Geology (Boulder) (March 2019) 47 (5): 399-402

Abstract

Deltas are dynamic systems that can provide important information on past climate conditions. Arctic deltas have the potential to preserve information about climate in one of the most temperature-sensitive regions of the Earth. We present experimental results assessing the effects of ice cover on delta morphodynamics to identify signatures of ice-cover presence during deposition. Ice cover drives spatial variation in sediment transport on the subaqueous delta clinoform through sub-ice channels, which leads to the development of (1) extended delta lobes built by elongated, subaqueous sediment wedges, and (2) bathymetry with increasing topographic roughness from the shoreline to a depth nearly equal bottom-fast ice thickness. These unique seascape and stratigraphic features record past climate conditions, and can serve as indicators of climate change on vulnerable Arctic coasts.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 5
Title: Ice cover as a control on the morphodynamics and stratigraphy of Arctic deltas
Affiliation: University of Texas at Austin, Jackson School of Geosciences, Austin, TX, United States
Pages: 399-402
Published: 20190306
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 17
Accession Number: 2019-024223
Categories: Geomorphology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019134
Illustration Description: illus.
Secondary Affiliation: Colgate University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201914
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