期刊
CRYOSPHERE
卷 10, 期 1, 页码 417-432出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/tc-10-417-2016
关键词
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资金
- National Science Foundation's Office of Polar Programs (NSF-OPP) [PLR-1418256, PLR-1023364]
- National Science Foundation's Office of Polar Programs (NSF-OPP) through the Woods Hole Oceanographic Institution Ocean and Climate Change Institute Arctic Research Initiative
- National Science Foundation
- Woods Hole Oceanographic Institution James E. and Barbara V. Moltz Research Fellowship
- National Aeronautics and Space Administration's (NASA) Cryospheric Sciences Program [NNX15AD55G]
- Office of Polar Programs (OPP) [1418256] Funding Source: National Science Foundation
Measurements of near-ice (<200 m) hydrography and near-terminus subglacial hydrology are lacking, due in large part to the difficulty in working at the margin of calving glaciers. Here we pair detailed hydrographic and bathymetric measurements collected with an autonomous underwater vehicle as close as 150m from the ice-ocean interface of the Saqqarliup sermia-Sarqardleq Fjord system, West Greenland, with modeled and observed subglacial discharge locations and magnitudes. We find evidence of two main types of subsurface glacially modified water (GMW) with distinct properties and locations. The two GMW locations also align with modeled runoff discharged at separate locations along the grounded margin corresponding with two prominent subcatchments beneath Saqqarliup sermia. Thus, near-ice observations and subglacial discharge routing indicate that runoff from this glacier occurs primarily at two discrete locations and gives rise to two distinct glacially modified waters. Furthermore, we show that the location with the largest subglacial discharge is associated with the lighter, fresher glacially modified water mass. This is qualitatively consistent with results from an idealized plume model.
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