资源环境科技发展态势分析平台

Advective pathways for Fukushima Daiichi Nuclear Power Plant (FDNPP)-derived cesium observed in 2013 at 166 degrees E south of the Kuroshio Extension (KE) at >500 m on the 26.5 sigma(theta). isopycnal are investigated. Attention is paid to the KE's role in shaping these pathways. Using a high-resolution model, particle trajectories were simulated backward and forward in time on 26.5 sigma(theta). between the 2013 observations and the 2011 source. A large fraction of backtracked trajectories interacted with the mixed layer just offshore of the FDNPP. The likeliest pathway reaching the deepest 2013 observed cesium location runs along the KE out to similar to 165 degrees E, where it turns sharply southward. Forward trajectory statistics suggest that for 26.5 sigma(theta). waters originating north of the KE, this current acted as a permeable barrier west of 155-160 degrees E. The deepest 2011 model mixed layers suggest that FDNPP-derived radionuclides may have been present at 30 degrees N in 2013 at greater depths and densities (700 m; 26.8 sigma(theta)).