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\begin{document}

\title{Wintertime lake drainage cascade triggers large-scale ice flow response
in Greenland}



\author[1]{Nathan Maier}%
\author[2]{Jonas Kvist Andersen}%
\author[3]{Jeremie Mouginot}%
\author[4]{Gimbert Florent}%
\author[4]{Gagliardini Olivier}%
\affil[1]{Institut des Géosciences de l'Environnement, CNRS, University of Grenoble Alpes}%
\affil[2]{DTU Space}%
\affil[3]{Université Grenoble Alpes, CNRS}%
\affil[4]{Institut des Géosciences de l'Environnement UGA/CNRS}%


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  \date{May 11, 2024}


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\begin{abstract}
Surface melt forces summertime ice-flow accelerations on glaciers and
ice sheets. Here, we show that large meltwater-forced accelerations also
occur in winter in Greenland. We document supraglacial lakes (SGLs)
draining in cascades at unusually high elevation, causing an expansive
flow acceleration over a \textasciitilde{}5200 km\textsuperscript{2}
region during winter. The 3-component interferometric surface velocity
field and decomposition modeling reveals the underlying flood
propagation with unprecedented detail as it traveled over 160 km from
the drainage site to the margin, providing novel constraints on
subglacial water pathways, drainage morphology, and links with basal
sliding. The triggering SGLs continuously grew over 40 years and
suddenly released decades of stored meltwater into regions of the bed
never previously forced, demonstrating surface melt can impact dynamics
well beyond its production. We show these events are common and thus
their cumulative impact on dynamics should be further evaluated.%
\end{abstract}%



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\textbf{Hosted file}

\verb`Fig1_animation.gif`  available at \url{https://authorea.com/users/564703/articles/611600-wintertime-lake-drainage-cascade-triggers-large-scale-ice-flow-response-in-greenland}

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