Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Temporal Behavior of Lake Size-Distribution in a Thawing Permafrost Landscape in Northwestern Siberia
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2014 (English)In: Remote Sensing, ISSN 2072-4292, E-ISSN 2072-4292, Vol. 6, no 1, 621-636 p.Article in journal (Refereed) Published
Abstract [en]

Arctic warming alters regional hydrological systems, as permafrost thaw increases active layer thickness and in turn alters the pathways of water flow through the landscape. Further, permafrost thaw may change the connectivity between deeper and shallower groundwater and surface water altering the terrestrial water balance and distribution. Thermokarst lakes and wetlands in the Arctic offer a window into such changes as these landscape elements depend on permafrost and are some of the most dynamic and widespread features in Arctic lowland regions. In this study we used Landsat remotely sensed imagery to investigate potential shifts in thermokarst lake size-distributions, which may be brought about by permafrost thaw, over three distinct time periods (1973, 1987-1988, and 2007-2009) in three hydrological basins in northwestern Siberia. Results revealed fluctuations in total area and number of lakes over time, with both appearing and disappearing lakes alongside stable lakes. On the whole basin scales, there is no indication of any sustained long-term change in thermokarst lake area or lake size abundance over time. This statistical temporal consistency indicates that spatially variable change effects on local permafrost conditions have driven the individual lake changes that have indeed occurred over time. The results highlight the importance of using multi-temporal remote sensing data that can reveal complex spatiotemporal variations distinguishing fluctuations from sustained change trends, for accurate interpretation of thermokarst lake changes and their possible drivers in periods of climate and permafrost change.

Place, publisher, year, edition, pages
2014. Vol. 6, no 1, 621-636 p.
Keyword [en]
remote sensing, hydrology, catchment, thermokarst lakes, permafrost, size-distribution, Siberia
National Category
Earth and Related Environmental Sciences Remote Sensing
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-105264DOI: 10.3390/rs6010621ISI: 000335555900027OAI: oai:DiVA.org:su-105264DiVA: diva2:729055
Funder
Swedish Research Council, 2007-8393
Note

AuthorCount:3;

Available from: 2014-06-25 Created: 2014-06-24 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Arctic Water System Change and its Interactions with Permafrost and Ecosystem Changes
Open this publication in new window or tab >>Arctic Water System Change and its Interactions with Permafrost and Ecosystem Changes
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Climate change and various changes in the landscape itself, such as permafrost thaw, may trigger and mediate substantial changes in the inland water system of the Arctic. Many climate change responses in the Arctic landscape and ecosystems are then related to alterations in the hydrological system. The nature of all these change interactions is not well understood. This thesis aims to improve our understanding of changes in the Arctic inland water system and their interactions with permafrost and ecosystem changes. Investigation of the spatial coverage of systematic hydrological monitoring data and observation data for hydro-climatically related ecosystem shifts, such as large-scale lake-area change, shows that this overlap is small. Yet some monitoring hotspot areas exist, where such data overlap and can be used to improve our understanding of linked hydrological, permafrost and ecosystem changes in the Arctic under climate change. Analysis of lake-change patterns in such hotspot areas indicates permafrost thaw as a main change driver/mediator of some change patterns. However, clear indication of basin-wide influence of permafrost thaw on hydrological discharge dynamics was only found in two relatively small out of total six investigated permafrost basins of different scales. Further, both permafrost and non-permafrost basins exhibit large-scale lake-area changes. A salient change pattern emerging across all investigated basins is an opposite direction of runoff change to that of precipitation change. This contrast is explainable by apparent evapotranspiration changes that may be due to observed changes in surface water (lake) area and associated water-storage changes. Patches of local lake-area change can thus add up to considerable large-scale effects on evapotranspiration and runoff changes. Overall, this thesis shows that linking water system change to permafrost and ecosystem changes is essential for advancing our understanding of Arctic environmental change.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography and Quaternary Geology, Stockholm University, 2014. 22 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 46
Keyword
Arctic, climate change, monitoring, ecosystem shifts, hydrology, hydro-climatic change, permafrost
National Category
Geosciences, Multidisciplinary Oceanography, Hydrology, Water Resources
Research subject
Physical Geography
Identifiers
urn:nbn:se:su:diva-108269 (URN)978-91-7649-015-0 (ISBN)
Public defence
2014-11-21, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Submitted.

Available from: 2014-10-30 Created: 2014-10-16 Last updated: 2014-11-21Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Karlsson, Johanna MårdLyon, Steve W.Destouni, Georgia
By organisation
Department of Physical Geography and Quaternary Geology
In the same journal
Remote Sensing
Earth and Related Environmental SciencesRemote Sensing

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 33 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf