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

Ye Jin Lim; Joseph S. Levy; Timothy A. Goudge; Wonsuck Kim

doi:10.1130/G45146.1

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

Ye Jin Lim, Joseph S. Levy, Timothy A. Goudge, Wonsuck Kim

Institute of Earth·Atmosphere·Astronomy(BK21+)

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

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 ≈ 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.

Original language	English
Pages (from-to)	399-402
Number of pages	4
Journal	Geology
Volume	47
Issue number	5
DOIs	https://doi.org/10.1130/G45146.1
Publication status	Published - 2019 May 1

Bibliographical note

Funding Information:
This work was supported in part by the Jackson School of Geosciences (University of Texas at Austin, USA) seed grant to Levy and Kim, and in part by a RioMAR consortium (https://www.jsg.utexas.edu/riomar/) grant to Kim. We thank the reviewers for their comments, which improved the manuscript.

Funding Information:
This work was supported in part by the Jackson School of Geosciences (University of Texas at Austin, USA) seed grant to Levy and Kim, and in part by a RioMAR consortium (https://www .jsg .utexas .edu/riomar/) grant to Kim. We thank the reviewers for their comments, which improved the manuscript.

Publisher Copyright:
© 2019 Geological Society of America.

All Science Journal Classification (ASJC) codes

Geology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1130/G45146.1

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title = "Ice cover as a control on the morphodynamics and stratigraphy of Arctic deltas",

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 ≈ 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.",

author = "Lim, {Ye Jin} and Levy, {Joseph S.} and Goudge, {Timothy A.} and Wonsuck Kim",

note = "Funding Information: This work was supported in part by the Jackson School of Geosciences (University of Texas at Austin, USA) seed grant to Levy and Kim, and in part by a RioMAR consortium (https://www.jsg.utexas.edu/riomar/) grant to Kim. We thank the reviewers for their comments, which improved the manuscript. Funding Information: This work was supported in part by the Jackson School of Geosciences (University of Texas at Austin, USA) seed grant to Levy and Kim, and in part by a RioMAR consortium (https://www .jsg .utexas .edu/riomar/) grant to Kim. We thank the reviewers for their comments, which improved the manuscript. Publisher Copyright: {\textcopyright} 2019 Geological Society of America.",

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doi = "10.1130/G45146.1",

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AU - Goudge, Timothy A.

AU - Kim, Wonsuck

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N2 - 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 ≈ 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.

AB - 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 ≈ 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.

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

Abstract

Bibliographical note

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UN SDGs

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