Program and Agenda

Abstract

CONSTRAINING INVENTORY ESTIMATES AND THE FATE OF CESIUM IN OCEAN SEDIMENTS OFF FUKUSHIMA USING DETAILED ISOTOPE PROFILES AND MIXING RATES

The Tohoku earthquake and tsunami of March 11, 2011 lead to multiple system failures at the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) that ultimately resulted in the largest nuclear disaster since Chernobyl. Reports of bottom-dwelling fish containing elevated cesium concentrations near the FDNPP suggest that the sediments could be a continued source to bottom-dwelling biota. Quantifying the total amount of cesium incorporated into the sediment reservoir has proven challenging due to limited coring within the 30 km zone around the FDNPP, the spatial heterogeneities in marine sediments, and the potential for inventory fluctuations due to physical, biological, and chemical processes. We use lead-210, thorium-234, and cesium-134 and -137 profiles from new sediment cores (8 to 20 cm length) with other prior studies to re-evaluate total sediment inventories to 3400 m water depth, which we estimate to be around 75 TBq for cesium-137. This represents less than 1% of the estimated total Fukushima cesium releases. We can also evaluate the potential decadal evolution of surface cesium concentrations using inventory distributions, grain size analyses, and modeled mixing rates.

ePoster:

Authors

Black, E., MIT-WHOI Joint Program, USA, eblack@mit.edu

Buesseler, K., Woods Hole Oceanographic Institute, USA, kbuesseler@whoi.edu

Pike, S., Woods Hole Oceanographic Institute, USA, spike@whoi.edu

Nishikawa, J., Atmosphere and Ocean Research Institute of the University of Tokyo, Japan, jn@aori.u-tokyo.ac.jp

Kanda, J., Tokyo University of Marine Science and Technology, Japan, jkanda@kaiyodai.ac.jp

Details

Poster presentation

Session #:114
Date: 2/24/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: 595