Detalhes bibliográficos
| Resumo: | Research in geocryology is currently principally concerned with the effects of climate change on permafrost terrain. The moti-vations for most of the research are (1) quantification of the anticipated net emissions of CO 2 and CH4 from warming and thawof near-surface permafrost and (2) mitigation of effects on infrastructure of such warming and thaw. Some of the effects, such asincreases in ground temperature or active-layer thickness, have been observed for several decades. Landforms that are sensitiveto creep deformation are moving more quickly as a result, and Rock Glacier Velocity is now part of the Essential Climate VariablePermafrost of the Global Climate Observing System. Other effects, for example, the occurrence of physical disturbances associ-ated with thawing permafrost, particularly the development of thaw slumps, have noticeably increased since 2010. Still, others,such as erosion of sedimentary permafrost coasts, have accelerated. Geochemical effects in groundwater from trace elements,including contaminants, and those that issue from the release of sediment particles during mass wasting have become evident since 2020. Net release of CO 2 and CH4 from thawing permafrost is anticipated within two decades and, worldwide, may reachemissions that are equivalent to a large industrial economy. The most immediate local concerns are for waste disposal pits thatwere constructed on the premise that permafrost would be an effective and permanent containment medium. This assumptionis no longer valid at many contaminated sites. The role of ground ice in conditioning responses to changes in the thermal or hy-drological regimes of permafrost has re-emphasized the importance of regional conditions, particularly landscape history, whenapplying research results to practical problems. |
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| Autores principais: | Burn, Christopher R. |
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| Outros Autores: | Bartsch, Annett; Chakraborty, Elora; Das, Soumik; Frauenfelder, Regula; Gärtner‐Roer, Isabelle; Gisnås, Kjersti G.; Herring, Teddi; Jones, Benjamin M.; Kokelj, Steven V.; Langer, Moritz; Lathrop, Emma; Murton, Julian B.; Nielsen, David M.; Niu, Fujun; Olson, Christine; O'Neill, H. Brendan; Opfergelt, Sophie; Overduin, Pier Paul; Schaefer, Kevin; Schuur, Edward A. G.; Skierszkan, Elliott; Smith, Sharon L.; Stuenzi, Simone M.; Tank, Suzanne E.; van der Sluijs, Jurjen; Vieira, Gonçalo; Westermann, Sebastian; Wolfe, Stephen A.; Yarmak, Ed |
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| Assunto: | Geochemical contamination Greenhouse gas emissions Ground ice Infrastructure stability Permafrost thaw Thermokarst |
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| Ano: | 2024 |
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| País: | Portugal |
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| Tipo de documento: | artigo |
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| Tipo de acesso: | acesso aberto |
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| Instituição associada: | Universidade de Lisboa |
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| Idioma: | inglês |
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| Origem: | Repositório da Universidade de Lisboa |
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