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The spatio-temporal patterns of landfast ice in Antarctica during 2006-2011 and 2016-2017 using high-resolution SAR imagery

journal contribution
posted on 2023-05-21, 08:14 authored by Li, X, Shokr, M, Hui, F, Chi, Z, Petra HeilPetra Heil, Chen, Z, Yu, Y, Zhai, M, Cheng, X

Landfast ice is an important component of the Antarctic sea ice regime. It affects the Antarctic climate and ecological system. In this study, the first high-resolution, long time series of the landfast ice edge from 2006 to 2011 and 2016 to 2017 is presented. The dataset was produced based on the improved net gradient difference algorithm using 2470 SAR scenes from ENVISAT and Sentinel-1A/B as well as manual analysis of MODIS imagery to fill in SAR data gaps. The study results show that the landfast ice area in November for all studied years was approximately 49.49 ± 3.25 × 104 km2, accounting for about 3%–4% of the total Antarctic sea ice area. The maximum area was 55.70 × 104 km2 in November 2007, compared to the minimum area 44.01 × 104 km2 in 2011. The area in West Antarctica was about 40% of that in East Antarctica. The distribution of landfast ice in Antarctica has significant regional differences. The extent in the Indian Ocean sector is the maximum with a mean value of 16.49 ± 1.1 × 104 km2; however, the ratio of the landfast ice area to the sea ice area in the Pacific Ocean sector is the highest. Twenty-four landfast ice zones with groups of small, grounded icebergs were identified, most of which were located in East Antarctica, particularly along the Wilkes Land and Oates Land. Two cases are presented to illustrate how giant, grounded icebergs affected landfast ice. Results from this study are well suited to underpin the Antarctic climate or ecological system studies.

History

Publication title

Remote Sensing of Environment

Volume

242

Article number

111736

Number

111736

Pagination

1-12

ISSN

0034-4257

Department/School

Institute for Marine and Antarctic Studies

Publisher

Elsevier Science Inc

Place of publication

360 Park Ave South, New York, USA, Ny, 10010-1710

Rights statement

© 2020 Elsevier Inc.

Repository Status

  • Restricted

Socio-economic Objectives

Antarctic and Southern Ocean ice dynamics

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