Radiofrequency Ice Dielectric Measurements at Summit Station, Greenland ...

• Main Authors: Aguilar, J. A., Allison, P., Besson, David, Bishop, A., Botner, O., Bouma, S., Buitink, S., Cataldo, M., Clark, B. A., Couberly, K., Curtis-Ginsberg, Z., Dasgupta, P., de Kockere, S., de Vries, K. D., Deaconu, C., DuVernois, M. A., Eimer, A., Glaser, C., Hallgren, A., Hallmann, S., Hanson, J. C., Hendricks, B., Henrichs, J., Heyer, N., Hornhuber, C., Hughes, K., Karg, T., Karle, A., Kelley, J. L., Korntheuer, M., Kowalski, Marek, Kravchenko, I., Krebs, R., Lahmann, R., Latif, U., Mammo, J., Marsee, M. J., Meyers, Z. S., Michaels, K., Mulrey, K., Muzio, M., Nelles, A., Novikov, A., Nozdrina, A., Oberla, E., Oeyen, B., Plaisier, I., Punsuebsay, N., Pyras, L., Ryckbosch, D.
• Format: Text
• Language: English
• Published: Deutsches Elektronen-Synchrotron, DESY, Hamburg 2023
• Subjects: Greenland; Ice Sheet
• Online Access: https://dx.doi.org/10.3204/pubdb-2023-07211; https://bib-pubdb1.desy.de/record/599187

We recently reported on the radio-frequency attenuation length of cold polar ice at Summit Station, Greenland, based on bistatic radar measurements of radio-frequency bedrock echo strengths taken during the summer of 2021. Those data also include echoes attributed to stratified impurities or dielectric discontinuities within the ice sheet (layers), which allow studies of a) estimation of the relative contribution of coherent (discrete layers, e.g.) vs. incoherent (bulk volumetric, e.g.) scattering, b) the magnitude of internal layer reflection coefficients, c) limits on the azimuthal asymmetry of reflections (birefringence), and d) limits on signal dispersion in-ice over a bandwidth of ~100 MHz. We find that i) after averaging 10000 echo triggers, reflected signal observable over the thermal floor (to depths of approximately 1500 m) are consistent with being entirely coherent, ii) internal layer reflection coefficients are measured at approximately -60 to -70 dB, iii) birefringent effects for vertically ...