Water Science and Technology; Earth-Surface Processes
Abstract :
[en] Rapid changes in thickness and velocity have been observed at many marine-terminating glaciers in Greenland, impacting the volume of ice they export, or discharge, from the ice sheet. While annual estimates of ice-sheet wide discharge have been previously derived, higher-resolution records are required to fully constrain the temporal response of these glaciers to various climatic and mechanical drivers that vary in sub-annual scales. Here we sample outlet glaciers wider than 1 km (N = 230) to derive the first continuous, ice-sheet wide record of total ice sheet discharge for the 2000-2016 period, resolving a seasonal variability of 6 %. The amplitude of seasonality varies spatially across the ice sheet from 5 % in the southeastern region to 9 % in the northwest region. We analyze seasonal to annual variability in the discharge time series with respect to both modelled meltwater runoff, obtained from RACMO2.3p2, and glacier front position changes over the same period. We find that year-to-year changes in total ice sheet discharge are related to annual front changes (r 2 = 0.59, p = 10-4) and that the annual magnitude of discharge is closely related to cumulative front position changes (r 2 = 0.79), which show a net retreat of > 400 km, or an average retreat of > 2 km at each surveyed glacier. Neither maximum seasonal runoff or annual runoff totals are correlated to annual discharge, which suggests that larger annual quantities of runoff do not relate to increased annual discharge. Discharge and runoff, however, follow similar patterns of seasonal variability with near-coincident periods of acceleration and seasonal maxima. These results suggest that changes in glacier front position drive secular trends in discharge, whereas the impact of runoff is likely limited to the summer months when observed seasonal variations are substantially controlled by the timing of meltwater input.
Disciplines :
Earth sciences & physical geography
Author, co-author :
King, Michalea D; Byrd Polar and Climate Research Center, Columbus, USA ; School of Earth Sciences, Ohio State University, Columbus, USA
Howat, Ian M; Byrd Polar and Climate Research Center, Columbus, USA ; School of Earth Sciences, Ohio State University, Columbus, USA
Jeong, Seongsu ; Department of Earth System Science, University of California, Irvine
Noh, Myoung J; Byrd Polar and Climate Research Center, Columbus, USA
Wouters, Bert; Institute for Marine and Atmospheric research Utrecht, Utrecht University, Utrecht, Netherlands ; Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands
Noël, Brice ; Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie ; Institute for Marine and Atmospheric research Utrecht, Utrecht University, Utrecht, Netherlands
van den Broeke, Michiel R ; Institute for Marine and Atmospheric research Utrecht, Utrecht University, Utrecht, Netherlands
Language :
English
Title :
Seasonal to decadal variability in ice discharge from the Greenland Ice Sheet.
Acknowledgements. This work was supported by grants 80NSSC18K1027 and NNX13AI21A from the US National Aeronautics and Space Administration and a fellowship from the Ohio State University. Contributions of BW were funded by NOW VIDI grant 016.Vidi.171.065. The authors thank the two anonymous referees and the editor, A. Vieli, for their helpful comments.
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