Japan Geoscience Union Meeting 2014

Presentation information

Print

Poster

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS30_28PO1] Paleoclimatology and paleoceanography

Mon. Apr 28, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Yamada Kazuyoshi(School of Human Sciences, Waseda University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Tomohisa Irino Tomohisa(Faculty of Environmental Earth Science, Hokkaido University), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Kobe University Research Center For Inland Seas), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Masakazu Yoshimori(Atmosphere and Ocean Research Institute, University of Tokyo)

6:15 PM - 7:30 PM

[MIS30-P09] A Southern Ocean trigger for Northwest Pacific ventilation during the Holocene?

Stephan RELLA1, *Masao UCHIDA1 (1.National Institute for Environmental Studies)

Keywords:Holocene, Northwest Pacific, Radiocarbon, Southern Ocean overtuning, Southern westerly winds

Holocene ocean circulation is poorly understood due to sparsity of dateable marine archives with submillennial-scale resolution. Here we present a record of mid-depth water radiocarbon contents in the Northwest (NW) Pacific Ocean over the last 12.000 years, which shows remarkable millennial-scale variations relative to changes in atmospheric radiocarbon inventory. Apparent decoupling of these variations from regional ventilation and mixing processes leads us to the suggestion that the mid-depth NW Pacific may have responded to changes in Southern Ocean overturning forced by latitudinal displacements of the southern westerly winds. By inference, a tendency of in-phase related North Atlantic and Southern Ocean overturning would argue against the development of a steady bipolar seesaw regime during the Holocene.This study was also published in Scietific Reports.