JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS10] [EJ] Global climate change driven by the Southern Ocean and the Antarctic Ice Sheet

Wed. May 24, 2017 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall HALL7)

convener:Kay I.Ohshima(Institute of Low Temperature Science, Hokkaido University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems)

[MIS10-P04] Pliocene seasonal sea-ice history around the Kerguelen Plateau in the Southern Ocean based on diatom analysis

*Saki Ishino1, Yuji Kato1, Itsuki Suto1 (1.Graduate School of Environmental Studies, Nagoya University)

Keywords:Southern Ocean, paleoenvironment, sea ice, ODP, diatom

Fossil diatoms have been regarded as a useful proxy for paleoceanographic reconstruction such as past sea-ice distribution in the Southern Ocean (Armand et al., 2005). Several studies have attempted to reveal sea-ice history based on fluctuation of the sea-ice related diatoms, however there is few paleoceanographic studies focusing on changes of summer and winter sea-ice distribution. We categorized the sea-ice related diatoms reported in Armand et al. (2005) into two groups, summer sea-ice diatom species and winter sea-ice diatom species. The former group is abundantly observed within summer sea-ice zone and the latter group is widely found within winter sea-ice zone. In this study, late Pliocene summer and winter sea-ice distributions in the Indian sector of the Southern Ocean are estimated based on temporal changes in abundance of the summer and winter sea-ice diatom species. Analyzed samples are ODP Leg 188 Hole 1165B and Leg 119 Hole 745B, which are located near recent summer and winter sea-ice edge respectively.