Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier
Top melting of ice-wedges and subsequent ground subsidence is now a widespread phenomenon across the Arctic domain. We show field and remote sensing observations that document extensive ice-wedge degradation, which initially has resulted in increased wetness contrast across the landscape (i.e. both...
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ftawi:oai:epic.awi.de:39321 2024-09-15T17:51:37+00:00 Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier Liljedahl, Anna K. Boike, Julia Daanen, R. P. Fedorov, A. Frost, Gerald Grosse, Guido Hinzman, L. Iijima, Yoshihiro Jorgenson, Janet Matveyeva, N. V. Necsoiu, M. Raynolds, Martha K. Romanovsky, V. E. Schulla, J. Tape, Ken Walker, Donald A. Wilson, Cathy Yabuki, H 2015-12-15 https://epic.awi.de/id/eprint/39321/ https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/64961 https://hdl.handle.net/10013/epic.46509 unknown Liljedahl, A. K. , Boike, J. orcid:0000-0002-5875-2112 , Daanen, R. P. , Fedorov, A. , Frost, G. , Grosse, G. orcid:0000-0001-5895-2141 , Hinzman, L. , Iijima, Y. , Jorgenson, J. , Matveyeva, N. V. , Necsoiu, M. , Raynolds, M. K. , Romanovsky, V. E. , Schulla, J. , Tape, K. , Walker, D. A. , Wilson, C. and Yabuki, H. (2015) Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier , AGu Fall Meeting, San Francisco, USA, 14 December 2015 - 18 December 2015 . hdl:10013/epic.46509 EPIC3AGu Fall Meeting, San Francisco, USA, 2015-12-14-2015-12-18 Conference notRev 2015 ftawi 2024-06-24T04:13:16Z Top melting of ice-wedges and subsequent ground subsidence is now a widespread phenomenon across the Arctic domain. We show field and remote sensing observations that document extensive ice-wedge degradation, which initially has resulted in increased wetness contrast across the landscape (i.e. both a drying and a wetting), a shift in pond type and an overall drying in later stages. The differential ground subsidence at cold continuous permafrost regions appear to be linked to press and pulse climate forcing. Here, the process of crossing the local threshold for ice-wedge stability may be favored by a press occurrence such as long-term, gradual increases in summer air temperature, mean annual air temperature and/or possibly winter precipitation, but our observations suggest it is most likely initiated by pulse atmospheric forcing such as extreme summer warmth and/or winter precipitation. Field measurements of water levels, frost tables and snow accumulation across the main ice-wedge polygon types and their respective features support dramatic shifts in the hydrologic regime with altered topography and a complexity that ultimately affect the larger-scale hydrologic system. For example, our numerical model experiments show that a connected trough-network reduces inundation and increases runoff and that changing patterns of snow distribution due to the differential ground subsidence play a crucial role in altering lowland tundra water balance. These fine-scale (10’s cm) geomorphic changes are expected to further expand and amplify in rapidly warming permafrost regions and likely will dramatically modify land-atmosphere and land-ocean fluxes and exchange of carbon, water, and energy. Conference Object Arctic Ice permafrost Tundra wedge* Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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unknown |
description |
Top melting of ice-wedges and subsequent ground subsidence is now a widespread phenomenon across the Arctic domain. We show field and remote sensing observations that document extensive ice-wedge degradation, which initially has resulted in increased wetness contrast across the landscape (i.e. both a drying and a wetting), a shift in pond type and an overall drying in later stages. The differential ground subsidence at cold continuous permafrost regions appear to be linked to press and pulse climate forcing. Here, the process of crossing the local threshold for ice-wedge stability may be favored by a press occurrence such as long-term, gradual increases in summer air temperature, mean annual air temperature and/or possibly winter precipitation, but our observations suggest it is most likely initiated by pulse atmospheric forcing such as extreme summer warmth and/or winter precipitation. Field measurements of water levels, frost tables and snow accumulation across the main ice-wedge polygon types and their respective features support dramatic shifts in the hydrologic regime with altered topography and a complexity that ultimately affect the larger-scale hydrologic system. For example, our numerical model experiments show that a connected trough-network reduces inundation and increases runoff and that changing patterns of snow distribution due to the differential ground subsidence play a crucial role in altering lowland tundra water balance. These fine-scale (10’s cm) geomorphic changes are expected to further expand and amplify in rapidly warming permafrost regions and likely will dramatically modify land-atmosphere and land-ocean fluxes and exchange of carbon, water, and energy. |
format |
Conference Object |
author |
Liljedahl, Anna K. Boike, Julia Daanen, R. P. Fedorov, A. Frost, Gerald Grosse, Guido Hinzman, L. Iijima, Yoshihiro Jorgenson, Janet Matveyeva, N. V. Necsoiu, M. Raynolds, Martha K. Romanovsky, V. E. Schulla, J. Tape, Ken Walker, Donald A. Wilson, Cathy Yabuki, H |
spellingShingle |
Liljedahl, Anna K. Boike, Julia Daanen, R. P. Fedorov, A. Frost, Gerald Grosse, Guido Hinzman, L. Iijima, Yoshihiro Jorgenson, Janet Matveyeva, N. V. Necsoiu, M. Raynolds, Martha K. Romanovsky, V. E. Schulla, J. Tape, Ken Walker, Donald A. Wilson, Cathy Yabuki, H Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier |
author_facet |
Liljedahl, Anna K. Boike, Julia Daanen, R. P. Fedorov, A. Frost, Gerald Grosse, Guido Hinzman, L. Iijima, Yoshihiro Jorgenson, Janet Matveyeva, N. V. Necsoiu, M. Raynolds, Martha K. Romanovsky, V. E. Schulla, J. Tape, Ken Walker, Donald A. Wilson, Cathy Yabuki, H |
author_sort |
Liljedahl, Anna K. |
title |
Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier |
title_short |
Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier |
title_full |
Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier |
title_fullStr |
Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier |
title_full_unstemmed |
Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier |
title_sort |
ice wedge degradation: why arctic lowlands are becoming wetter and drier |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/39321/ https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/64961 https://hdl.handle.net/10013/epic.46509 |
genre |
Arctic Ice permafrost Tundra wedge* |
genre_facet |
Arctic Ice permafrost Tundra wedge* |
op_source |
EPIC3AGu Fall Meeting, San Francisco, USA, 2015-12-14-2015-12-18 |
op_relation |
Liljedahl, A. K. , Boike, J. orcid:0000-0002-5875-2112 , Daanen, R. P. , Fedorov, A. , Frost, G. , Grosse, G. orcid:0000-0001-5895-2141 , Hinzman, L. , Iijima, Y. , Jorgenson, J. , Matveyeva, N. V. , Necsoiu, M. , Raynolds, M. K. , Romanovsky, V. E. , Schulla, J. , Tape, K. , Walker, D. A. , Wilson, C. and Yabuki, H. (2015) Ice wedge degradation: Why Arctic lowlands are becoming wetter and drier , AGu Fall Meeting, San Francisco, USA, 14 December 2015 - 18 December 2015 . hdl:10013/epic.46509 |
_version_ |
1810293567685394432 |