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Representativitet av snödjup vid marktemperaturmätningar under snö för permafrostmodellering i området kring Tarfaladalen, norra Sverige
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2013 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Snö och permafrost är två interagerande komponenter i Kryosfären. Studien undersöker

snödjupets representativitet vid marktemperaturmätningar under snötäcket (BTS) för

identifiering av permafrost i Tarfala, norra Sverige. Snödjupsmätningar har utfördes i

två korsande 20 m transekter i nordsydlig (NS) samt östvästlig (ÖV) riktning utifrån en

BTS-punkt. Totalt har 37 BTS (snödjup > 80 cm) med tillhörande snödjupsmätningar

registrerats och analyserats. Snödjupet varierar både lokalt kring mätpunkten och

regionalt i mättransekter men är ändå ett representativt snödjup för en punkt.

Representativa BTS, sett ur ett snödjupsperspektiv, bör registreras på platser med

måttlig snödjupsvariation som på platser med homogent markunderlag, vindskyddade

områden, lä bakom ryggar och sluttningar vinkelräta mot den dominerande

vindriktningen.

BTS provplatser bör också ta hänsyn till de mest förekommande klasserna av

parametrarna altitud, sluttning och slutningsriktning för att erhålla representativa BTS.

Detta baserat på jämförelse mellan två strategier för insamling av BTS genom

permafrostmodellering mellan två dataset. Ett BTS dataset från 2011 jämfört med BTS

insamlade mars 2013.

Abstract [en]

Snow and permafrost are two interacting components in the Cryosphere. This study is

focusing on snow depth and its influence on bottom temperature of snow cover (BTS)

in Tarfala, Northern Sweden. BTS indicate the absence or presence of permafrost if the

snow depth > 80 cm. Snow depth measurements were carried out with a resolution of 1

m in two 20 m crossing transects in NS and EW direction around the BTS point. A total

of 37 BTS with accompanying snow depths was measured and analyzed. Snow depths

varied around the BTS but are representative for the measured 20 m transects. Locations

with moderate snow depth variations make out representative probe sites from a snow

depth perspective, such as homogenous ground cover, wind protected areas, in the lee

behind ridges and slopes perpendicular towards the dominating wind direction.

Also to find representative BTS probe site two strategies for collecting BTS have been

evaluated through permafrost modeling. One dataset recorded in 2011 focused on

covering a big variety of altitude, slope and aspects. The second dataset registered in

March 2013 aimed to cover the most frequent classes of the mentioned parameters. The

latter strategy is also the preferably method based on the comparison between the two

models.

Place, publisher, year, edition, pages
2013. , 32 p.
Keyword [en]
BTS, snow depth, snow, permafrost, modeling
Keyword [sv]
BTS, snödjup, permafrost, modellering
National Category
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-95557OAI: oai:DiVA.org:su-95557DiVA: diva2:660750
Supervisors
Examiners
Available from: 2013-10-31 Created: 2013-10-30 Last updated: 2013-10-31Bibliographically approved

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Brandel_2013(1733 kB)273 downloads
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Type fulltextMimetype application/pdf

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Department of Physical Geography and Quaternary Geology
Physical Geography

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