dc.date.accessioned | 2023-08-18T15:34:41Z | |
dc.date.available | 2023-08-18T15:34:41Z | |
dc.date.created | 2023-02-25T14:26:10Z | |
dc.date.issued | 2023 | |
dc.identifier.citation | Peter, Maria Andersen, Jane Lund Nixon, Francis Chantel Etzelmüller, Bernd Westermann, Sebastian Fredin, Ola . Near-surface temperatures and potential for frost weathering in blockfields in Norway and Svalbard. Earth Surface Processes and Landforms. 2023, 48(5), 940-955 | |
dc.identifier.uri | http://hdl.handle.net/10852/103384 | |
dc.description.abstract | Blockfields remain enigmatic regarding their origin, internal structure, surface processes, and glaciological implications. In Scandinavia, blockfields are found on high-elevation, low-relief mountains (plateaus) across the Arctic and Subarctic. In this study, we present a 1D numerical model that uses near-surface temperatures measured between summer 2018 and summer 2020 to calculate frost-cracking intensities (FCI) within the ground column in three different blockfields in Norway and Svalbard. Eighty-nine miniature temperature loggers were distributed on Tron Mountain (1650 m a.s.l.) in Alvdal, Gamlemsveten (780 m a.s.l.) near Ålesund in southwestern Norway and on Platåberget (460 m a.s.l.) near Longyearbyen, Svalbard. We modelled FCI by scaling the time spent in the frost cracking window (between −3 and −8°C) with the temperature gradient and a penalty function for distance to available water. At Tron and Gamlemsveten, ground temperatures never reached the frost cracking window at one third of our sites due to insulation by a thick snow cover in depressions and on the lee sides of summits. The highest FCI (0.05–0.4 K m) are obtained where the subsurface consists of boulders and stones in a matrix of relatively fine sediment (sand, silt, gravel). In contrast, very low FCI (0.003–0.02 K m) were modelled for blocky layers with large air-filled pores because of the low water availability. On Platåberget, all sensors reached the frost-cracking window during the annual temperature cycle, but FCI are extremely low (0.0004–0.15 K m) as water availability is limited due to (i) permafrost and (ii) near-surface temperatures remaining below the frost-cracking window for 3/4 of the year. This indicates that boulder-rich blockfields with air-filled hollows are preserved in very cold climates, whereas warmer, maritime settings with higher availability of fine interstitial material place blockfields in the fast lane for frost weathering. | |
dc.language | EN | |
dc.rights | Attribution-NonCommercial 4.0 International | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc/4.0/ | |
dc.title | Near-surface temperatures and potential for frost weathering in blockfields in Norway and Svalbard | |
dc.title.alternative | ENEngelskEnglishNear-surface temperatures and potential for frost weathering in blockfields in Norway and Svalbard | |
dc.type | Journal article | |
dc.creator.author | Peter, Maria | |
dc.creator.author | Andersen, Jane Lund | |
dc.creator.author | Nixon, Francis Chantel | |
dc.creator.author | Etzelmüller, Bernd | |
dc.creator.author | Westermann, Sebastian | |
dc.creator.author | Fredin, Ola | |
cristin.unitcode | 185,15,22,0 | |
cristin.unitname | Institutt for geofag | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |
dc.identifier.cristin | 2129191 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Earth Surface Processes and Landforms&rft.volume=48&rft.spage=940&rft.date=2023 | |
dc.identifier.jtitle | Earth Surface Processes and Landforms | |
dc.identifier.volume | 48 | |
dc.identifier.issue | 5 | |
dc.identifier.startpage | 940 | |
dc.identifier.endpage | 955 | |
dc.identifier.doi | https://doi.org/10.1002/esp.5528 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0197-9337 | |
dc.type.version | PublishedVersion | |