Open Access Repository

Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing

Downloads

Downloads per month over past year

Kusahara, K ORCID: 0000-0003-4067-7959 2020 , 'Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing' , Journal of Climate, vol. 33, no. 12 , pp. 4941-4973 , doi: 10.1175/JCLI-D-19-0659.1.

[img]
Preview
PDF
143659 - Intera...pdf | Download (11MB)

| Preview

Abstract

Much attention has been paid to ocean-cryosphere interactions over the Southern Ocean. Basal melting of Antarctic ice shelves has been reported to be the primary ablation process for the Antarctic ice sheets. Warm waters on the continental shelf, such as Circumpolar Deep Water (CDW) and Antarctic Surface Water (AASW), play a critical role in active ice shelf basal melting. However, the temporal evolution and mechanisms of the basal melting and warm water intrusions throughout the twentieth century and the early twenty-first century have not been rigorously examined and are not fully understood. Here, we conduct a numerical experiment of an ocean-sea ice-ice shelf model forced with a century-long atmospheric reanalysis for the period 1900-2010. To begin with, we provide an assessment of the atmospheric conditions by comparing with available observation and show biases in warming and stronger westerly trends. Taking into account the limitation, we examine the interannual-to-multidecadal variability in the Antarctic ice shelf basal melting and the role of coastal water masses. A series of numerical experiments demonstrate that wind stress changes over the Southern Ocean drive enhanced poleward heat transport by stronger subpolar gyres and reduce coastal sea ice and cold-water formations, both of which result in an increased ocean heat flux into Antarctic ice shelf cavities. Furthermore, an increase of sea ice-free days leads to enhanced regional AASW contribution to the basal melting. This study demonstrates that changes in Antarctic coastal water masses are key metrics for better understanding of the ocean-cryosphere interaction over the Southern Ocean.

Item Type: Article
Authors/Creators:Kusahara, K
Keywords: ocean, ice shelves, Southern Ocean, water masses/storage, interannual variability, trends
Journal or Publication Title: Journal of Climate
Publisher: Amer Meteorological Soc
ISSN: 0894-8755
DOI / ID Number: 10.1175/JCLI-D-19-0659.1
Copyright Information:

Copyright 2020 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code §?107) or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC § 108) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. All AMS journals and monograph publications are registered with the Copyright Clearance Center (https://www.copyright.com). Additional details are provided in the AMS Copyright Policy statement, available on the AMS website (https://www.ametsoc.org/PUBSCopyrightPolicy).

Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP