ZH (2024-2025): NSFGEO-NERC: Investigating the direct influence of meltwater on Antarctic Ice Sheet dynamics

• Columbia University/Lamont-Doherty Earth Observatory

We are proposing field work on Flask Glacier, Antarctic Peninsula, to the NSF office of polar programs. The proposal is not submitted, but our target submission date is mid-Aug. We would like to instal three passive seismic stations to monitor the tremor induced by turbulent subglacial water flow on Flask Glacier, Antarctica. This will form part of a broader deployment of instruments, to test the hypothesis that meltwater from the surface accessing the bed is the cause of the flow of the glacier temporarily increasing during warm periods. One of our goals is to detect the flow of subglacial meltwater via the characteristic tremor it generates, using passive seismometers. We are proposing to deploy three instruments along a flow line on the glacier, around 1 km apart. Ideally, this will allow us to detect temporal changes in subglacial discharge (qualitatively). Given the along-flow distribution of the instruments, we may also be able to track spatial variability in the onset, peak and cessation of enhanced seismic energy, associated with the downstream propagation of elevated subglacial discharge. We would like to request 4 instruments and 4 data loggers, along with power systems, as discussed over email and in a call on Friday July 24th. In that call it was established that the most appropriate equipment are the Nanometrics Trillium Compact Broadband instrument and the Nanometrics Centaur Datalogger.

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