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Hydro-climatic and lake change patterns in Arctic permafrost and non-permafrost areas

Author:
Karlsson, Johanna Mård, Jaramillo, Fernando, Destouni, Georgia
Source:
Journal of hydrology 2015 v.529 pp. 134-145
ISSN:
0022-1694
Subject:
temporal variation, basins, rivers, evapotranspiration, permafrost, lakes, watersheds, runoff, Arctic region
Abstract:
This paper investigates patterns of lake-area and hydro-climatic change in Arctic river basins, and possible influence of permafrost change reflected in such patterns. A salient change pattern, emerging across all investigated basins in both permafrost and non-permafrost areas, is an opposite change direction in runoff (R) from that in precipitation (P). To explain this change contrast, an increase (decrease) in relative water-balance constrained evapotranspiration ETwb/P is required where R decreases (increases). Increasing temporal variability of daily river discharge (sdQ) is found in all basins with spatially extensive lake decrease, which also exhibit decrease in ETwb/P. Clear indication of basin-wide permafrost thaw is found in only one basin, and is possible in two more, but unlikely in the largest of the total four investigated permafrost basins.
Agid:
5398006