 Ice arches that form along Nairie Strait, which separates Greenland and Ellesmere Island, act to reduce the export of thick multi-year ice out of the Arctic. Here, we show that there has been a recent trend towards shorter duration arch formation that has resulted in enhanced transport of ice along the Strait. This article was authored by G. W. K. Moore, S. E. L. Howell, M. Brady and others.