Arctic Change 2017 Québec session invitation

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Arctic Change 2017 Québec session invitation

Sofia Antonova
Dear colleagues,
we would like to invite you to our session at the Arctic Change 2017 conference, which takes place in Québec, Canada, December 11-15 2017 (http://www.arcticnetmeetings.ca/ac2017
Session ID COA03:
Quantifying Thaw Subsidence and Frost Heave in Permafrost Terrain - Bringing Together Multiscale Measurements and Implications for the Future.
The main aim of the session is to bring together various methods for measuring permafrost deformation and to discuss how to combine different scales of in situ and remote sensing observations.
For more information see the detailed session description below.
The deadline for abstract submission is Friday, September 22, 2017

We are looking forward to receiving your abstracts and to meeting you in Québec!

Best regards,

Julia Boike
Sofia Antonova
Philip Marsh

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Session description:
In permafrost lands, the active layer is the upper layer of the ground which thaws and freezes seasonally. A fully water-saturated active layer in summer increases in volume during freezing in winter due to the decrease in density of ice compared to water. Cycles of excess ice formation in winter and loss in summer result in seasonal vertical movements of the ground in both directions, notably frost heave and thaw settlement (or subsidence). The magnitude of these movements depends on the ice/water content and distribution in the active layer. Measuring the magnitudes of these movements can in turn aid in estimation of ice/water content, which is one of the most important ground variables for permafrost modeling. Besides the seasonal thaw subsidence and frost heave, long-term and, likely, irreversible subsidence was observed in different permafrost regions by several studies which included in situ and remote sensing observations. This long-term net subsidence is likely explained by thawing of very ice-rich permafrost directly under the active layer and corresponds well to the observed warming in the Arctic during last decades. Methods for the detection and quantifying such ground movements include repeat in situ measurements such as thaw tubes, heave rods, differential global positioning system (DGPS) measurements and terrestrial laser scanning as well as remote sensing methods such as Synthetic Aperture Radar (SAR) interferometry and airborne laser scanning. These methods aim at different spatial scales, ranging from pointwise to the averaged over tens of square meters. Bringing the gap between these scales and perform a reliable validation of remote sensing observations is an essential task for the deep understanding of mechanism of subsidence and heave processes and predicting the future state of permafrost terains. This session proposes to bring together results of circum-Arctic observations on thaw subsidence and frost heave, and discuss the current challenges for these observations as well as possible strategies of combining in situ and satellite scales.
Co-chairs:
Julia Boike (Alfred Wegener Institute, Potsdam, Germany)
Sofia Antonova (GIScience, Institute of Geography, Heidelberg University, Germany)
Philip Marsh (Wilfrid Laurier University, Waterloo, Ontario, Canada)

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