Arctic lakes show strong decadal trend in earlier spring ice-out
Arctic lakes show strong decadal trend in earlier spring ice-out
The timing of the seasonal freeze-thaw cycle of arctic lakes affects ecological processes and land-atmosphere energy fluxes. We carried out detailed ice-phenology mapping of arctic lakes, based on daily surface-reflectance time series for 2000-2013 from MODIS at 250 m spatial resolution. We used over 13,300 lakes, area >1 km2, in five study areas distributed evenly across the circumpolar Arctic — the first such phenological dataset. All areas showed significant trends towards an earlier break-up, stronger than previously reported. The mean shift in break-up start ranged from -0.10 days/year (Northern Europe) to -1.05 days/year (central Siberia); the shift in break-up end was between -0.14 and -0.72 days/year. Finally, we explored the effect of temperature on break-up timing and compared results among study areas. The 0°C isotherm shows the strongest relationship (r = 0.56 – 0.81) in all study areas. If early break-up continues, rapidly changing ice phenology will likely generate significant, arctic-wide impacts.
Šmejkalová, Tereza
88ee2b76-458a-4c25-b6d4-46a21feb2420
Edwards, Mary
4b6a3389-f3a4-4933-b8fd-acdfef72200e
Dash, Jadu
51468afb-3d56-4d3a-aace-736b63e9fac8
7 December 2016
Šmejkalová, Tereza
88ee2b76-458a-4c25-b6d4-46a21feb2420
Edwards, Mary
4b6a3389-f3a4-4933-b8fd-acdfef72200e
Dash, Jadu
51468afb-3d56-4d3a-aace-736b63e9fac8
Šmejkalová, Tereza, Edwards, Mary and Dash, Jadu
(2016)
Arctic lakes show strong decadal trend in earlier spring ice-out.
Scientific Reports, 6, [38449].
(doi:10.1038/srep38449).
Abstract
The timing of the seasonal freeze-thaw cycle of arctic lakes affects ecological processes and land-atmosphere energy fluxes. We carried out detailed ice-phenology mapping of arctic lakes, based on daily surface-reflectance time series for 2000-2013 from MODIS at 250 m spatial resolution. We used over 13,300 lakes, area >1 km2, in five study areas distributed evenly across the circumpolar Arctic — the first such phenological dataset. All areas showed significant trends towards an earlier break-up, stronger than previously reported. The mean shift in break-up start ranged from -0.10 days/year (Northern Europe) to -1.05 days/year (central Siberia); the shift in break-up end was between -0.14 and -0.72 days/year. Finally, we explored the effect of temperature on break-up timing and compared results among study areas. The 0°C isotherm shows the strongest relationship (r = 0.56 – 0.81) in all study areas. If early break-up continues, rapidly changing ice phenology will likely generate significant, arctic-wide impacts.
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Accepted/In Press date: 9 November 2016
e-pub ahead of print date: 7 December 2016
Published date: 7 December 2016
Organisations:
Global Env Change & Earth Observation
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Local EPrints ID: 402965
URI: http://eprints.soton.ac.uk/id/eprint/402965
PURE UUID: 358140f9-5712-40d0-b6cf-9e1be3034ea0
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Date deposited: 21 Nov 2016 11:34
Last modified: 16 Mar 2024 03:35
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Author:
Tereza Šmejkalová
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