Ventilation changes in the western North Pacific since the last glacial period 1Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
03 Jan 2012
2Senior Research Fellow Center, Ehime University, Matsuyama, Japan
3Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
4Graduate School of Science and Engineering, University of Toyama, Toyama, Japan
Received: 05 August 2011 – Published in Clim. Past Discuss.: 18 August 2011 Abstract. We reconstructed the ventilation record of deep water at 2100 m depth in the
mid-latitude western North Pacific over the past 25 kyr from radiocarbon
measurements of coexisting planktic and benthic foraminiferal shells in
sediment with a high sedimentation rate. The 14C data on fragile and
robust planktic foraminiferal shells were concordant with each other,
ensuring high quality of the reconstructed ventilation record. The
radiocarbon activity changes were consistent with the atmospheric record,
suggesting that no massive mixing of old carbon from the abyssal reservoir
occurred throughout the glacial to deglacial periods.
Revised: 11 November 2011 – Accepted: 20 November 2011 – Published: 03 January 2012
Citation: Okazaki, Y., Sagawa, T., Asahi, H., Horikawa, K., and Onodera, J.: Ventilation changes in the western North Pacific since the last glacial period, Clim. Past, 8, 17-24, doi:10.5194/cp-8-17-2012, 2012.