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Sea Ice Reports for the Antarctic Shipping Season 2017 - 2018

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Sea Ice Reports for the Antarctic Shipping Season 2017 - 2018 TECHNICAL REPORT Sea ice reports for the Antarctic shipping season 2017 - 2018 ACE CRC Prepared by Dr Jan L Lieser ANTARCTIC CLIMATE & ECOSSTEMS CRC Sea ice reports for the Antarctic shipping season 2017–2018 Prepared by: Dr Jan L Lieser ([email protected]) Published by: Antarctic Climate & Ecosystems Cooperative Research Centre, May 2018 ISSN 2200–5498 (Print) ISSN 2200–5501 (Online) TR_ICE09_160607 © The Antarctic Climate & Ecosystems Cooperative Research Centre 2018. This work may be reproduced in whole or in part for study or training purposes subject to the inclusion of an acknowledgement of the source, but not for commercial sale or use. Reproduction for purposes other than those listed above requires the written permission of the Antarctic Climate & Ecosystems Cooperative Research Centre (ACE CRC). The material in this report is based on data mainly provided by third parties. There are inherent uncertainties in the data. While every effort has been made to ensure the material in this report is accurate, ACE CRC provides no warranty, guarantee or representation that material is accurate, complete, up–to–date, non–infringing or fit for a particular purpose. The use of the material is entirely at the risk of the user. The user must independently verify the suitability of the material for their own use. The ACE CRC, its participating organisations and their officers, employees, contractors and agents does not accept any liability for any loss, damage, costs or expenses whether direct, indirect, consequential including loss of profits, opportunity and third party claims that may be caused through the use of, reliance upon, or interpretation of the material in this report. Cover photo: Dr Jan L Lieser, University of Tasmania Citation: Lieser JL (2018) Sea ice reports for the Antarctic shipping season 2017–2018. Antarctic Climate & Ecosystems Cooperative Research Centre, Hobart, Tasmania. ISSN 2200–5498. Requests and enquiries concerning reproduction rights should be addressed to: The Manager Communications Antarctic Climate & Ecosystems Cooperative Research Centre University of Tasmania Private Bag 80 Hobart, 7001 Tasmania, Australia Tel: +61 3 6226 7888 Fax: +61 3 6226 2440 Email: [email protected] www.acecrc.org.au The ACE CRC is established and supported under the Australian Government’s Business Cooperative Research Centres Program. The ACE CRC is a collaboration between the Australian Antarctic Division, CSIRO, University of Tasmania, Australian Government Department of the Environment, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (Germany), National Institute of Water and Atmospheric Research Ltd (NZ), Australian Bureau of Meteorology, and a consortium of other participants. This research was also supported under Australian Research Council’s Special Research Initiative for Antarctic Gateway Partnership (Project ID SR140300001). SEA ICE REPORTS - 2017-2018 SEASON Executive summary The sea-ice reports compiled in this document are weekly reports on sea-ice conditions for East Antarctica, including sub-weekly updates. They were prepared to support ship operations in East Antarctica during the 2017/2018 shipping season. These reports were primarily used to inform the Australian Antarctic program, but were provided to other Antarctic operators as well. In particular, we assisted the Royal New Zealand Navy (HMNZS Otago), the Australian Marine National Facility (RV Investigator), New Zealand's National Institute of Water and Atmospheric Research (RV Tangaroa), US National Science Foundation (RVIB Nathaniel B. Palmer), and a commercial fishing operator. Throughout the shipping season, the focus of individual reports shifts with the main purpose of specific voyages of the Australian Antarctic research and supply vessel Aurora Australis and other customer requirements. The Antarctic voyages of RSV Aurora Australis in the 2017/2018 season were: No. Depart port Main Purpose Return to port V1 29/10/2017 Davis Station resupply 03/12/2017 V2 13/12/2017 Casey Station resupply 11/01/2018 V3 16/01/2018 Mawson Station resupply; Davis summer retrieval 06/03/2018 In early 2017, the distribution of sea ice around Antarctica was preconditioned by very low sea-ice extent at the end of 2016, which was, however, heterogeneously distributed around the continent. Higher sea-ice concentration were observed in East Antarctica and the Weddell Sea whereas in much of the rest of Antarctica the coast was exposed to the ocean. On 01/03/2017, overall sea-ice extent reached its annual minimum of 2:07 × 106 km2 marking a new record low extent, which occurred also about two weeks later than typical. In autumn, warm, northerly air advection and elevated sea-surface temperatures delayed sea-ice growth around West Antarctica and the Ross Sea. Throughout winter, the sea-ice extent remained below the envelope of two standard deviations of the median. By mid-September, sea-ice extent appeared to have peaked just above 18:01 × 106 km2 when it began to decline again, but reached its annual maximum extent only on 09/10/2017 with 18:06 × 106 km2, which was about a week later than the previous latest sea-ice maximum (observed in 1988). The re-emergence of the so-called Maud Rise Polynya was also observed from mid-September and throughout austral spring 2017. In early December, the polynya reached an extent of more than 250 000 km2 (comparable to the size of New Zealand). Research is ongoing attributing the causes and effects of this occurrence, but it is expected to be linked to a similar, although shorter lived and smaller event in 2016. About this report This compilation is the seventh volume of sea-ice reports prepared by the Sea Ice Service of the Australian Research Council's Special Research Initiative for Antarctic Gateway Partnership and is supported by the sea-ice group of the Antarctic Climate & Ecosystems Cooperative Research Centre and the Australian Antarctic Division. The first report of this compilation was issued in calendar week 19 of 2017, after the 2016/2017 shipping season ended in May 2017. Previous volumes are available from the Manager Communications, Antarctic Climate & Ecosystems Cooperative Research Centre (see inside cover for details) and online here: http://acecrc.org.au/services/sea-ice-charting/ PAGE | 1 SEA ICE REPORTS - 2017-2018 SEASON PAGE | 2 SEA ICE REPORTS - 2017-2018 SEASON Contents Report # Date Main Focus Page 19.1/2017 04/05/2017 Cooperation Sea; Sabrina Coast; D'Urville Sea ........ 7 20.1/2017 09/05/2017 Antarctica .............................................. 10 22.1/2017 22/05/2017 Antarctica;Sabrina Coast .............................. 11 23.1/2017 29/05/2017 Mawson Station ......................................... 13 24.1/2017 08/06/2017 Antarctica;Iceberg D-15 ............................... 15 25.1/2017 13/06/2017 Antarctica; Mawson Station; Davis Station; Budd Coast 17 26.1/2017 22/06/2017 Antarctica;D'Urville Sea ................................ 21 27.1/2017 26/06/2017 Mawson Coast; Ingrid Christensen Coast; Law Dome . 23 28.1/2017 04/07/2017 Mawson Coast; Sabrina Coast; D'Urville Sea .......... 26 29.1/2017 10/07/2017 Mawson Coast .......................................... 30 29.2/2017 11/07/2016 Antarctica .............................................. 32 29.3/2017 14/07/2016 Sabrina Coast;D'Urville Sea ............................ 33 30.1/2017 21/07/2017 Davis Station;Sabrina Coast ........................... 35 31.1/2017 24/07/2017 Sabrina Coast;Iceberg A-68 ........................... 38 31.2/2017 27/07/2017 Mawson Coast; Sabrina Coast; D'Urville Sea .......... 41 32.1/2017 01/08/2017 Mawson Coast; Davis Station; Sabrina Coast .......... 44 32.2/2017 04/08/2017 Iceberg D-15; Sabrina Coast; D'Urville Sea ............. 47 33.1/2017 08/08/2017 Mawson Coast; Prydz Bay; Sabrina Coast; D'Urville Sea 50 33.2/2017 09/08/2017 Davis Station ............................................ 54 33.3/2017 10/08/2017 Antarctica .............................................. 55 34.1/2017 15/08/2017 Mawson Coast; Sabrina Coast; D'Urville Sea .......... 56 35.1/2017 21/08/2017 Davis Station;D'Urville Sea .............................. 59 35.2/2017 22/08/2017 Casey Station;D'Urville Sea ............................ 62 35.3/2017 24/08/2017 Mawson Coast;D'Urville Sea ........................... 64 36.1/2017 28/08/2017 Davis Station;D'Urville Sea .............................. 66 36.2/2017 01/09/2017 Mawson Coast; Sabrina Coast; D'Urville Sea .......... 68 37.1/2017 04/09/2017 Antarctica; Davis Station; Sabrina Coast .............. 72 37.2/2017 07/09/2017 Cape Darnley; Davis Station; Sabrina Coast ........... 75 38.1/2017 13/09/2017 Antarctica; Sabrina Coast; D'Urville Sea ............... 78 39.1/2017 18/09/2017 Davis Station ............................................ 81 39.2/2017 21/09/2017 East Antarctica ......................................... 83 41.1/2017 03/10/2017 Mawson Station; Davis Station; D'Urville Sea; A-68A ... 84 41.2/2017 04/10/2017 Antarctica .............................................. 87 41.3/2017 06/10/2017 Davis Station; Casey Station ............................ 88 42.1/2017 11/10/2017 Cooperation Sea ....................................... 90 42.2/2017 13/10/2017 Antarctica;D'Urville Sea ................................ 91 43.1/2017 18/10/2017 Antarctica;D'Urville Sea ................................ 93 43.2/2017 19/10/2017 Mawson Station; Casey Station; Sabrina Coast ....... 95 43.3/2017 20/10/2017 East Antarctica ......................................... 98 44.1/2017
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