Preprints
https://doi.org/10.5194/tc-2023-136
https://doi.org/10.5194/tc-2023-136
08 Sep 2023
 | 08 Sep 2023
Status: a revised version of this preprint is currently under review for the journal TC.

A physics-based Antarctic melt detection technique: Combining AMSR-2, radiative transfer modeling, and firn modeling

Marissa Eileen Dattler, Brooke Medley, and C. Max Stevens

Abstract. Surface melt on ice shelves has been linked to hydrofracture and subsequent ice shelf breakup. Since the 1990s, scientists have been using microwave radiometers to detect melt on ice shelves and ice sheets by applying various statistically based thresholds to identify significant increases in brightness temperature that are associated with melt. We combine a statistical thresholding technique with Community Firn Model outputs, the Snow Microwave Radiative Transfer model, and AMSR-2 to create a hybrid method that accounts for the influence of variations in snow temperature and density on microwave brightness temperature. In the process, we also produce snow correlation lengths, and we run this algorithm on 13 sites over the Antarctic Ice Sheet and ice shelves. Compared to melt values from surface energy balance observations from automatic weather stations, this method is as accurate as previous statistically based thresholding techniques and is slightly more sensitive to melt events. Our correlation lengths from early 2014 correlate with surface grain size from the 2013–2014 Mosaic of Antarctica. We also find a significant relationship between correlation length and frequency of melt. In the future, this hybrid method can be further developed to quantify melt volume rather than to simply detect melt occurrence.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Marissa Eileen Dattler, Brooke Medley, and C. Max Stevens

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2023-136', Sophie de Roda Husman, 22 Sep 2023
    • AC2: 'Reply on RC1', Marissa Dattler, 15 Nov 2023
  • RC2: 'Comment on tc-2023-136', Ghislain Picard, 29 Sep 2023
    • AC1: 'Reply on RC2', Marissa Dattler, 15 Nov 2023
Marissa Eileen Dattler, Brooke Medley, and C. Max Stevens
Marissa Eileen Dattler, Brooke Medley, and C. Max Stevens

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Short summary
We develop an algorithm based on combining models and satellites observations to identify the presence of surface melt on the Antarctic Ice Sheet. We compare two sites to observations taken in the field and find that this method works similarly to previous methods. Unlike other previous methods, this algorithm is based on physical parameters and updates to this method could allow this algorithm to quantify the amount of melt water present on the Antarctic Ice instead of simply detecting it.