Impact of spatial averaging on radar reflectivity at internal snowpack layer boundaries

N. Rutter, H.-p. Marshall, K. Tape, R. Essery, J. King

Research output: Contribution to journalArticlepeer-review

Abstract

Microwave radar amplitude within a snowpack can be strongly influenced by spatial variability of internal layer boundaries. We quantify the impact of spatial averaging of snow stratigraphy and physical snowpack properties on surface scattering from near-nadir frequency-modulated continuous-wave radar at 12–18 GHz. Relative permittivity, density, grain size and stratigraphic boundaries were measured in-situ at high resolution along the length of a 9 m snow trench. An optimal range of horizontal averaging (4–6 m) was identified to attribute variations in surface scattering at layer boundaries to dielectric contrasts estimated from centimetre-scale measurements of snowpack stratigraphy and bulk layer properties. Single vertical profiles of snowpack properties seldom captured the complex local variability influencing near-nadir radar surface scattering. We discuss implications of scaling in-situ measurements for snow radiative transfer modelling and evaluation of airborne microwave remote sensing of snow.
Original languageEnglish
Pages (from-to)1-10
JournalJournal of Glaciology
Early online date9 Sep 2016
DOIs
Publication statusE-pub ahead of print - 9 Sep 2016

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