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Landscape influences on climate-related lake shrinkage at high latitudes

Global Change Biology

By:
, ,
DOI: 10.1111/gcb.12196

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Abstract

Climate-related declines in lake area have been identified across circumpolar regions and have been characterized by substantial spatial heterogeneity. An improved understanding of the mechanisms underlying lake area trends is necessary to predict where change is most likely to occur and to identify implications for high latitude reservoirs of carbon. Here, using a population of ca. 2300 lakes with statistically significant increasing and decreasing lake area trends spanning longitudinal and latitudinal gradients of ca. 1000 km in Alaska, we present evidence for a mechanism of lake area decline that involves the loss of surface water to groundwater systems. We show that lakes with significant declines in lake area were more likely to be located: (1) in burned areas; (2) on coarser, well-drained soils; and (3) farther from rivers compared to lakes that were increasing. These results indicate that postfire processes such as permafrost degradation, which also results from a warming climate, may promote lake drainage, particularly in coarse-textured soils and farther from rivers where overland flooding is less likely and downslope flow paths and negative hydraulic gradients between surface water and groundwater systems are more common. Movement of surface water to groundwater systems may lead to a deepening of subsurface flow paths and longer hydraulic residence time which has been linked to increased soil respiration and CO2 release to the atmosphere. By quantifying relationships between statewide coarse resolution maps of landscape characteristics and spatially heterogeneous responses of lakes to environmental change, we provide a means to identify at-risk lakes and landscapes and plan for a changing climate.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Landscape influences on climate-related lake shrinkage at high latitudes
Series title:
Global Change Biology
DOI:
10.1111/gcb.12196
Volume
19
Issue:
7
Year Published:
2013
Language:
English
Publisher:
Wiley
Contributing office(s):
Alaska Cooperative Fish and Wildlife Research Unit
Description:
9 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
2276
Last page:
2284
Country:
United States
State:
Alaska