{'fraction_non_alphanumeric': 0.017870439314966492, 'fraction_numerical': 0.010424422933730455, 'mean_word_length': 4.946902654867257, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Glaciological characteristics in the Dome Fuji region and new assessment for “Oldest Ice”

Abstract. A key objective in palaeo-climatology is the retrieval of a
continuous Antarctic ice-core record dating back 1.5 Ma. The identification
of a suitable Antarctic site requires sufficient knowledge of the subglacial
landscape beneath the Antarctic Ice Sheet. Here, we present new ice thickness
information from the Dome Fuji region, East Antarctica, based on airborne
radar surveys conducted during the 2014/15 and 2016/17 southern summers.
Compared to previous maps of the region, the new dataset shows a more complex
landscape with networks of valleys and mountain plateaus. We use the new
dataset as input in a thermokinematic model that incorporates uncertainties
in geothermal heat flux values in order to improve the predictions of
potential ice-core sites. Our results show that especially the region
immediately south of Dome Fuji station persists as a good candidate site for
obtaining an old ice core. An initial assessment of basal conditions revealed
the existence of what appears to be subglacial lakes. Further radar data
analysis shows overall high continuity of layer stratigraphy in the region.
This indicates that extending the age–depth information from the Dome Fuji
ice core to a new ice-core drill site is a viable option.
