HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Institute of Low Temperature Science >
Peer-reviewed Journal Articles, etc >

Breakup of land-fast sea ice in Lutzow-Holm Bay, East Antarctica, and its teleconnection to tropical Pacific sea surface temperatures

Files in This Item:
Aoki-2017-Geophysical_Research_Letters.pdf1.49 MBPDFView/Open
Please use this identifier to cite or link to this item:

Title: Breakup of land-fast sea ice in Lutzow-Holm Bay, East Antarctica, and its teleconnection to tropical Pacific sea surface temperatures
Authors: Aoki, S. Browse this author
Keywords: land-fast sea ice
ice breakup
East Antarctica
glacier advance and retreat
Issue Date: 7-Apr-2017
Publisher: American Geophysical Union
Journal Title: Geophysical research letters
Volume: 44
Issue: 7
Start Page: 3219
End Page: 3227
Publisher DOI: 10.1002/2017GL072835
Abstract: A large land-fast sea ice breakup occurred in 2016 in Lutzow-Holm Bay, East Antarctica. The breakup caused calving from the Shirase Glacier Tongue. Although similar breakups and calving have been observed in the past, the timing and magnitudes are not well-constrained. The ice's breakup latitude during 1997-2016 was analyzed to investigate the variables controlling breakup and examine correlation with local calving for a longer period. The breakup latitude in April had a persistently high correlation with sea surface temperature (SST) in the tropical Pacific, which exceeds correlations with local atmospheric variables. The years of five out of six observed calving events from the mid-20th century can correspond to those of warm SST episodes and calving-front retreat in the 1980s to warmer SST shift. Our proposed teleconnection between tropical SST and Antarctic sea ice could lead to better predictions of breakup and might impact the glacier flux for a wider region. Plain Language Summary Land-fast sea ice forms along the Antarctic coast, and it occasionally breaks up significantly. The breakup event influences the flow of glaciers, which is otherwise held back by the fast ice. The breakup of land-fast sea ice and the discharge of glaciers have significant multidecadal variability as well as interannual variability. This study explores what controls the breakup phenomena of land-fast sea ice in Antarctica and finds the linkage with tropical sea surface temperatures. We find the environmental factors which are relevant to the ice breakup, and those variables are originally driven by the teleconnection from the tropical Pacific. We believe that our study makes a significant contribution in climate science by offering a causal mechanism that explains the previously observed multidecadal variability in ice extent in this region. Our model can explain five out of the last six calving events in a major glacier connected to this bay, offering hope for future predictions of ice behavior. This will also merit the logistics to Antarctic research stations.
Rights: An edited version of this paper was published by AGU. Copyright (2017) American Geophysical Union.      Aoki, S. (2017), Breakup of land-fast sea ice in Lützow-Holm Bay, East Antarctica, and its teleconnection to tropical Pacific sea surface temperatures, Geophys. Res. Lett., 44, 3219–3227. To view the published open abstract, go to and enter the DOI.  DOI:10.1002/2017GL072835.10.1002/2017GL072835.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 青木 茂

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University