Radiofrequency ice dielectric measurements at Summit Station, Greenland

• Published in: Journal of Glaciology
• Main Authors: Aguilar, Juan Antonio, Allison, Patrick, Besson, Dave, Bishop, Abby, Botner, Olga, Bouma, Sjoerd, Buitink, Stijn, Cataldo, Maddalena, Clark, Brian A., Couberly, Kenny, Curtis-Ginsberg, Zach, Dasgupta, Paramita, de Kockere, Simon, de Vries, Krijn D., Deaconu, Cosmin, Duvernois, Michael A., Eimer, Anna, Glaser, Christian, Hallgren, Allan, Hallmann, Steffen, Hanson, Jordan Christian, Hendricks, Bryan, Henrichs, Jakob, Heyer, Nils, Hornhuber, Christian, Hughes, Kaeli, Karg, Timo, Karle, Albrecht, Kelley, John L., Korntheuer, Michael, Kowalski, Marek, Kravchenko, Ilya, Krebs, Ryan, Lahmann, Robert, Latif, Uzair, Mammo, Joseph, Marsee, Matthew J., Meyers, Zachary S., Michaels, Kelli, Mulrey, Katharine, Muzio, Marco, Nelles, Anna, Novikov, Alexander, Nozdrina, Alisa, Oberla, Eric, Oeyen, Bob, Plaisier, Ilse, Punsuebsay, Noppadol, Pyras, Lilly, Ryckbosch, Dirk, Scholten, Olaf, Seckel, David, Seikh, Mohammad Ful Hossain, Smith, Daniel, Stoffels, Jethro, Southall, Daniel, Terveer, Karen, Toscano, Simona, Tosi, Delia, van den Broeck, Dieder J., van Eijndhoven, Nick, Vieregg, Abigail G., Vischer, Janna Z., Welling, Christoph, Williams, Dawn R., Wissel, Stephanie, Young, Robert, Zink, Adrian
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2023
• Subjects: Physics and Astronomy; Earth and Environmental Sciences; NEUTRINO DETECTOR; RADAR ATTENUATION; PERFORMANCE; ANTARCTICA; ABSORPTION; SCATTERING; DESIGN; SHELF; Arctic glaciology; ice physics; radio-echo sounding; Arctic; Greenland; South Pole; Antarc*; Antarctica; Journal of Glaciology; South pole
• Online Access: https://biblio.ugent.be/publication/01J08F660KAQ37QS82K6PMCV1S; http://hdl.handle.net/1854/LU-01J08F660KAQ37QS82K6PMCV1S; https://doi.org/10.1017/jog.2023.72; https://biblio.ugent.be/publication/01J08F660KAQ37QS82K6PMCV1S/file/01J08F75QTN5G3PQ2RWAPVYECJ

We recently reported on the radio-frequency attenuation length of cold polar ice at Summit Station, Greenland, based on bi-static radar measurements of radio-frequency bedrock echo strengths taken during the summer of 2021. Those data also allow studies of (a) the relative contributions of coherent (such as discrete internal conducting layers with sub-centimeter transversescale) vs incoherent (e.g. bulk volumetric) scattering, (b) the magnitude of internal layer reflection coefficients, (c) limits on signal propagation velocity asymmetries ('birefringence') and (d)limits on signal dispersion in-ice over a bandwidth of similar to 100 MHz. We find that (1) attenuation lengths approach 1 km in our band, (2) after averaging 10 000 echo triggers, reflected signals observable over the thermal floor (to depths of similar to 1500 m) are consistent with being entirely coherent, (3) internal layer reflectivities are approximate to-60 ->-70 dB, (4) birefringent effects for vertically propagating signals are smaller by an order of magnitude relative to South Pole and (5) within our experimental limits, glacial ice is non-dispersive over the frequency band relevant for neutrino detection experiments.