Raw data from two autonomous phase sensitive radar (ApRES) installations on Amery Ice Shelf, East Antarctica. Site, Lat, Lon, Installation, Retrieval AM06_borehole, -70.228432, 71.391693, 17-Jan-2015, 03-Feb-2018 AM06_downstream, -70.225635, 71.395988, 09-Mar-2015, 03-Feb-2018 ApRES phase-sensitive radar is a low-power, light-weight instrument developed in a collaboration between BAS and University College London. It is a 200-400 MHz FMCW radar, with a 1-second chirp, run by controller. Each radar was set to produce a burst of 50 chirps every 4 hrs, and a config file with radar settings is provided with each dataset. Files: *.dat - binary files containing raw data config.ini - config file containing all radar settings used for each site Software for processing the raw data can be obtained from Dr. Keith Nicholls, British Antarctic Survey. Limited Matlab scripts are provided here to open the raw data. Command: f=fmcw_load('filename.DAT') Data structure: Variable name Unit Description Nattenuators - Number of attenuation settings used (1 or 2) Attenuator_1 dB RF Attenuator value 1 Attenuator_2 dB RF Attenuator value 2 ChirpsInBurst - Number of chirps in burst TimeStamp day Time of first chirp (Matlab date format) Temperature_1 C Instrument temperature 1 Temperature_2 C Instrument temperature 2 BatteryVoltage V Battery voltage Burst - Number of burst in file FileFormat - Identifies file format from different equipment versions vif V Voltage chirpTime day Time of chirp (Matlab date format) filename - Filename SamplesPerChirp - Number of samples per chirp fs Hz Sampling frequency f0 Hz Start frequency K rad/s/s Chirp gradient (200MHz/s) f1 Hz Stop frequency B Hz Bandwidth fc Hz Centre frequency er - Material permittivity ci m/s Velocity in material lambdac m Centre wavelength t s Sampling time (relative to first sample) f Hz Frequency stamp for sample

Amery Ice Shelf AM04 borehole drilled mid-January 2006. Sub-shelf water profiling measurements conducted over a period of a few days. Partial video recording of borehole walls and sea floor benthos. Collection of targeted ice core samples. Sediment sample collected from sea floor. Long term monitoring instruments installed (thermistors in ice, 3 x CTD in ocean cavity). This is a parent record - see the child records for further information. This device stopped working by the 2011/2012 season, and all sensors were declared non-functional.

Amery Ice Shelf AM03 borehole drilled mid-December 2005. Sub-shelf water profiling measurements conducted over a period of a few days. Partial video recording of borehole walls and sea floor benthos. Sediment sample collected from sea floor. Long term monitoring instruments installed (thermistors in ice, 3 x CTD in ocean cavity). This is a parent record - see the child records for further information.

Amery Ice Shelf AM06 borehole drilled early January 2010. Sub-shelf water profiling measurements conducted over a period of a few days. Partial video recording of borehole walls and sea floor benthos. Collection of targeted ice core samples. Sediment sample collected from sea floor. Long term monitoring instruments installed (thermistors in ice, 3 x CTD in ocean cavity). This is a parent record - see the child records for further information, and access to the data. Some general readme documents are available for download from the provided URL.

Amery Ice Shelf AM03 borehole drilled mid-December 2005. Sub-shelf water profiling measurements conducted over a period of a few days. Partial video recording of borehole walls and sea floor benthos. Sediment sample collected from sea floor. Long term monitoring instruments installed (thermistors in ice, 3 x CTD in ocean cavity). There are several video files attached to this metadata record, and further details about them are provided in the accompanying readme document.

Amery Ice Shelf AM05 borehole drilled mid-December 2009. Sub-shelf water profiling measurements conducted over a period of a few days. Partial video recording of borehole walls and sea floor benthos. Collection of targeted ice core samples. Sediment sample collected from sea floor. Long term monitoring instruments installed (thermistors in ice, 3 x CTD in ocean cavity). This is a parent record - see the child records for further information. Some general readme documents are available for download from the provided URL.

Amery Ice Shelf AM04 borehole drilled mid-January 2006. Sub-shelf water profiling measurements conducted over a period of a few days. Partial video recording of borehole walls and sea floor benthos. Collection of targetted ice core samples. Sediment sample collected from sea floor. Long term monitoring instruments installed (thermistors in ice, 3 x CTD in ocean cavity). There are several video files attached to this metadata record, and further details about them are provided in the accompanying readme document.