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\begin{document}

\title{Rapid basal channel growth beneath Greenland's longest floating ice
shelf}



\author[1]{Ash Narkevic}%
\author[1]{Beata Csatho}%
\author[1]{Anton Schenk}%
\affil[1]{University at Buffalo}%


\vspace{-1em}



  
  \date{May 28, 2024}


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\begin{abstract}
Nioghalvfjerdsfjorden Glacier (N79) is one of the two main outlets for
Greenland's largest ice stream, the Northeast Greenland Ice Stream
(NEGIS), and is the more stable of the two, with no calving front
retreat expected in the near future. Using a novel elevation
reconstruction approach combining digital elevation models (DEMs) and
laser altimetry, previously undetected local phenomena are identified
complicating this assessment. N79 is found to have a complex network of
basal channels that were largely stable between 1978 and 2012. Since
then, an along-flow central basal channel has been growing rapidly,
likely due to increased runoff and ocean temperatures, and possibly
threatening to decouple the glacier's northwestern and southeastern
halves.%
\end{abstract}%



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