Four Years of Mode Water Evolution

Some 400 measured samples cesium (137Cs and 134Cs) obtained from the spring 2015 GO-SHIP occupation of the P16N 152°W line in the eastern North Pacific were employed to better understand the pathways, mixing and transport of mode waters formed in the North Pacific Ocean. (Read more…)


Understanding Subsurface Cross-Frontal Advection in Northwest Pacific

(A WHOI Summer Student Fellow Project)

In 2013, a subsurface Fukushima signal was observed at > 500 m at 165E. We look to understand how it arrived here. (Read more…)


A New Technique for Studying Tracer Spreading

(A WHOI Summer Student Fellow Project)

We have introduced a novel multi-iteration statistical method for studying tracer spreading using drifter data. (Read more…)


The Spread of the Fukushima Signal after Two Years

Radionuclide samples taken as part of a 2013 hydrographic survey at 30°N in the Pacific indicated surface 134Cs concentrations of 3–5 Bq/m3between 160°E and 160°W, and slightly lower concentrations west of 160°E. They revealed that the easternmost edge of Fukushima-derived 134Cs observed at 174.3°W in 2012 had progressed eastward across the basin to 160.6°W by 2013. (Read more…)


The Five Year Dispersal of the Fukushima Signal Predicted Using Surface Drifters

Employing some 40 years of North Pacific drifter-track observations from the Global Drifter Program database, statistics defining the horizontal spread of radionuclides from Fukushima nuclear power plant into the Pacific Ocean were investigated over a time scale of 5 years.(Read more…)