Näytä suppeat kuvailutiedot

Diversity of murtoos and murtoo-related subglacial landforms in the Finnish area of the Fennoscandian Ice Sheet

Mäkinen Joni; Valkama Markus; Ahokangas Elina; Kajuutti Kari; Tuunainen Aleksi; Palmu Jukka-Pekka; Ojala Antti EK

dc.contributor.authorMäkinen Joni
dc.contributor.authorValkama Markus
dc.contributor.authorAhokangas Elina
dc.contributor.authorKajuutti Kari
dc.contributor.authorTuunainen Aleksi
dc.contributor.authorPalmu Jukka-Pekka
dc.contributor.authorOjala Antti EK
dc.date.accessioned2022-10-28T13:58:41Z
dc.date.available2022-10-28T13:58:41Z
dc.identifier.urihttps://www.utupub.fi/handle/10024/168646
dc.description.abstractMurtoos are recently discovered triangular-shaped subglacial landforms that form under warm-based ice and in association with significant subglacial meltwater flow. They appear in distinct fields and commonly occur in the area that was covered by the Fennoscandian Ice Sheet during glacial periods. Murtoos potentially represent a transition form from non-channelized to channelized subglacial drainage networks. In the present study, we analyse and classify murtoos and murtoo-related landforms in the Finnish area of the Fennoscandian Ice Sheet based on their characteristics and appearance in LiDAR-based digital elevations models. Combined with morphometric analyses, the observations suggest that five types of murtoos and murtoo-related landforms are common and widespread in Finland: (i) triangle-type murtoos (TTMs), (ii) chevron-type murtoos (CTMs), (iii) lobate-type murtoos (LTMs), (iv) murtoo-related ridges and escarpments (MREs), and (v) other murtoo-related polymorphous landforms (PMRs) that look like small mounds and ridges. The morphometric characteristics of the different types are described here in detail, and it is shown that they are spatially and geomorphologically related. In addition, we provide examples of murtoos other than the TTMs to demonstrate that different murtoo types and murtoo-related landforms are composed of similar sediments and architectural characteristics. The diversity of murtoo landforms and the transition between distinct murtoo types indicate rapid and complicated variations in the configuration of subglacial hydrology at different spatial and temporal scales. This study emphasizes the essential role of subglacial meltwater in the shaping of glacial landscapes and the redistribution of large volumes of sediments during the deglaciation of the Fennoscandian Ice Sheet.
dc.language.isoen
dc.publisherWILEY
dc.titleDiversity of murtoos and murtoo-related subglacial landforms in the Finnish area of the Fennoscandian Ice Sheet
dc.identifier.urlhttps://onlinelibrary.wiley.com/doi/10.1111/bor.12526
dc.identifier.urnURN:NBN:fi-fe2021093048866
dc.contributor.organizationfi=maantiede|en=Geography |
dc.contributor.organizationfi=geologia|en=Geology|
dc.contributor.organization-code2606901
dc.contributor.organization-code2606902
dc.converis.publication-id59924746
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/59924746
dc.identifier.eissn1502-3885
dc.identifier.jour-issn0300-9483
dc.okm.affiliatedauthorOjala, Antti
dc.okm.affiliatedauthorKajuutti, Kari
dc.okm.affiliatedauthorAhokangas, Elina
dc.okm.affiliatedauthorMäkinen, Joni
dc.okm.discipline1171 Geosciencesen_GB
dc.okm.discipline1171 Geotieteetfi_FI
dc.okm.internationalcopublicationnot an international co-publication
dc.okm.internationalityInternational publication
dc.okm.typeJournal article
dc.publisher.countryUnited Statesen_GB
dc.publisher.countryYhdysvallat (USA)fi_FI
dc.publisher.country-codeUS
dc.relation.doi10.1111/bor.12526
dc.relation.ispartofjournalBoreas
dc.year.issued2021


Aineistoon kuuluvat tiedostot

Thumbnail

Aineisto kuuluu seuraaviin kokoelmiin

Näytä suppeat kuvailutiedot