Preprints
https://doi.org/10.5194/tc-2022-204
https://doi.org/10.5194/tc-2022-204
 
26 Oct 2022
26 Oct 2022
Status: this preprint is currently under review for the journal TC.

A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica

Takashi Obase1, Ayako Abe-Ouchi1,2, Fuyuki Saito3, Shun Tsutaki2,4, Shuji Fujita2,4, Kenji Kawamura2,3,4, and Hideaki Motoyama2,4 Takashi Obase et al.
  • 1Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
  • 2National Institute of Polar Research, Research Organization of Information and Systems, Tachikawa, Japan
  • 3Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
  • 4The Graduate University for Advanced Studies, SOKENDAI, Tachikawa, Japan

Abstract. The recovery of a new Antarctic ice core spanning the last ~1.5 million years will advance our understanding of climate system dynamics during the Quaternary. Recent glaciological field surveys have been conducted to select the most suitable core location near Dome Fuji (DF), Antarctica. Specifically, ground-based radar-echo soundings have been used to acquire highly detailed images of bedrock topography and internal ice layers. In this study, we use a one-dimensional (1-D) ice flow model to compute the temporal evolutions of age and temperature, in which the ice flow is linked with not only transient climate forcing associated with past glacial‒interglacial cycles, but also transient basal melting diagnosed along the evolving temperature profile. We investigated the influence of ice thickness, accumulation rate, and geothermal heat flux on the age and temperature profiles. The model was constrained by the observed temperature and age profiles reconstructed from DF ice‒core analysis. The results of sensitivity experiments indicate that ice thickness is the most crucial parameter influencing the computed age of the ice because it is critical to the history of basal temperature and basal melting, which can eliminate old ice. The 1-D model was applied to a 54 km long transect in the vicinity of DF and compared with radargram data. We found that the basal age of the ice is mostly controlled by the local ice thickness, demonstrating the importance of high spatial resolution surveys of bedrock topography for selecting ice-core drilling sites.

Takashi Obase et al.

Status: open (until 21 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-204', Frédéric Parrenin, 04 Nov 2022 reply
  • RC2: 'Comment on tc-2022-204', Anonymous Referee #2, 11 Nov 2022 reply
  • RC3: 'Review of Obase et al.: 1D temperature and age modeling at Dome Fuji', Anonymous Referee #3, 26 Nov 2022 reply

Takashi Obase et al.

Takashi Obase et al.

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Short summary
We use a one-dimensional ice flow model to examine the most suitable core location near Dome Fuji (DF), Antarctica. This model computes the temporal evolutions of age and temperature from past to present. We investigate the influence of different parameters of climate and ice sheet on the ice's basal age, and compare the results with ground radar surveys. We find that the local ice thickness primarily controls the age because it is critical to the basal melting, which can eliminate the old ice.