JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS23] [JJ] Paleoclimatology and paleoceanography

Mon. May 22, 2017 1:45 PM - 3:15 PM IC (International Conference Hall 2F)

convener:Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Ikuko Kitaba(Research Centre for Palaleoclimatology, Ritsumeikan University), Masaki Sano(Research Institute for Humanity and Nature), Chairperson:Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University)

2:00 PM - 2:15 PM

[MIS23-08] Responses of Antarctic and the Southern Ocean temperatures to changes in annual-mean insolation over the past 700,000 years

★Invited papers

*Ryu Uemura1, Dome Fuji ice core Research Group2 (1.University of the Ryukyus, 2.National Instititute of Polar Research)

Keywords:ice core, d-excess, glacial interglacial cycle

Antarctic temperature record, based on isotope composition of water (δD), shows close correlation between temperature and atmospheric CO2. Many studies suggest that a central role of the temperature variation of the Southern Ocean region for global carbon cycle. Deuterium-excess (d-excess = δD − 8δ18O) provides the information on the ocean surface conditions in the moisture source for polar precipitation. We show a new d-excess record from the 3,035m-depth Dome Fuji ice core (DF2), which was obtained at the Dome Fuji station. The new part of DF2 core (2400m to 3034m depth) extends back to 700 ky BP with high time-resolution. We reconstructed Antarctic air temperature (Tsite) and temperature at moisture source region (Tsource) using the new d-excess data. Relationship between Tsite, Tsource, and annual mean insolation will be discussed.