The spatial structure of the 128 ka Antarctic sea ice minimum ...

We compare multi-ice core data with δ18O model output for the early last interglacial Antarctic sea-ice minimum. The spatial pattern of δ18O across Antarctica is sensitive to the spatial pattern of sea-ice retreat. Local sea ice retreat increases the proportion of winter precipitation, depleting δ18...

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Bibliographic Details
Main Authors: Holloway, M, Sime, LC, Allen, CS, Hillenbrand, C-D, Bunch, P, Wolff, EW, Valdes, PJ
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2017
Subjects:
Antarctic
sea ice
last interglacial
128 ka
ice cores
sediment cores
Indian
Pacific
Southern Ocean
Antarc*
Antarctica
ice core
Sea ice
Online Access:https://dx.doi.org/10.17863/cam.20616
https://www.repository.cam.ac.uk/handle/1810/273542
Description
Summary:We compare multi-ice core data with δ18O model output for the early last interglacial Antarctic sea-ice minimum. The spatial pattern of δ18O across Antarctica is sensitive to the spatial pattern of sea-ice retreat. Local sea ice retreat increases the proportion of winter precipitation, depleting δ18O at ice core sites. However, retreat also enriches δ18O because of the reduced source to-site distance for atmospheric vapour. The joint overall effect is for δ18O to increase as sea ice is reduced. Our data-model comparison indicates a winter sea-ice retreat of 67, 59 and 43 % relative to pre-industrial in the Atlantic, Indian and Pacific sectors of the Southern Ocean. A compilation of Southern Ocean sea-ice proxy data provides weak support for this reconstruction. However, most published marine core sites are located too far north of the 128,000 years BP sea ice edge, preventing independent corroboration for this sea ice reconstruction. ...

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