Significant groundwater contribution to Antarctic ice streams hydrologic budget
Geophysical Research Letters
Wiley on behalf of the American Geophysical Union
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Christoffersen, P., Bougamont, M., Carter, S. P., Fricker, H. A., & Tulaczyk, S. (2014). Significant groundwater contribution to Antarctic ice streams hydrologic budget. Geophysical Research Letters, 41 https://doi.org/10.1002/2014GL059250
Satellite observations have revealed active hydrologic systems beneath Antarctic ice streams, but sources and sinks of water within these systems are uncertain. Here we use numerical simulations of ice streams to estimate the generation, flux, and budget of water beneath five ice streams on the Siple Coast. We estimate that 47% of the total hydrologic input (0.98 km3 yr−1) to Whillans (WIS), Mercer (MIS), and Kamb (KIS) ice streams comes from the ice sheet interior and that only 8% forms by local basal melting. The remaining 45% comes from a groundwater reservoir, an overlooked source in which depletion significantly exceeds recharge. Of the total input to Bindschadler (BIS) and MacAyeal (MacIS) ice streams (0.56 km3 yr−1), 72% comes from the interior, 19% from groundwater, and 9% from local melting. This contrasting hydrologic setting modulates the ice streams flow and has important implications for the search for life in subglacial lakes.
This work was carried out with support from the Isaac Newton Trust, Cecil H. and Ida M. Green Foundation and Natural Environment Research Council (grant NE/E005950/1 and NE/J005800/1).
External DOI: https://doi.org/10.1002/2014GL059250
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245226
Attribution-NonCommercial 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by-nc/2.0/uk/
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