Residence times of surface water and particle-reactive 210Pb and 210Po in the East China and Yellow seas

Spatial variations of 226Ra, 228Ra, and 228Th activities in seawater from the eastern East China Sea

“…In coastal area on the shelf, Chinese Coastal water migrates southward and the contribution of the Kuroshio water is much lower than that on the eastern side of the ECS in all seasons (Ichikawa and Beardsley, 2002). Data of 228 Ra activity and salinity of surface waters from the Yellow Sea (site CB41 to 45; Nozaki et al, 1991) are plotted on a line with data of our samples collected in February ( 226 Ra, 228 Ra, and 228 Th in seawater from the East China Sea 435 3b). The residence time of these CB water samples (5-7 y) may indicate that seasonal change in 228 Ra activity is small.…”

“…The shelf water exhibited a markedly higher 228 (Nozaki et al, 1991) (Fig. 3); data for the YKB-1007 water and samples of Zhang et al (2007) from the western ECS also appeared to be influenced by a sizeable Yangtze River discharge.…”

“…3), respectively. The 228 Ra activity and salinity of Kuroshio (0.1 mBq/L, 34.7) and Yangtze waters (2.75 mBq/L, 0) are from Nozaki et al (1991) and Elsinger and Moore (1984), respectively. In coastal area on the shelf, Chinese Coastal water migrates southward and the contribution of the Kuroshio water is much lower than that on the eastern side of the ECS in all seasons (Ichikawa and Beardsley, 2002).…”

Bio-accumulation of210Pb and210Po within the Trophic Level of Phytoplankton-Zooplankton-Anchovy-Mackerel in the Coastal Water of the Jeju Island, Korea

“…(Nozaki et al 1991;Stewart et al 2010;Tateda et al 2003). Chub mackerel (Scomber japonicus) Muscle 0.8 ± 0.03 0.21 ± 0.05 3.7 ± 0.9 Skin 2.9 ± 0.6 0.73 ± 0.13 3.9 ± 1.1 Internal organ 30 ± 7 1 .…”

Seasonal variations of228Ra/226Ra and228Th/228Ra ratios in surface water from the eastern East China Sea

“…5, the 228 Th/ 228 Ra ratio at the ECS surface is plotted against salinity. The water with high 228 Th activity and low salinity (< 34) exhibits into sediments on the shelf area (Nozaki et al, 1991;Aono and Yamada, 1999;Yang et al, 2003). The lower 228 Th/ 228 Ra ratio of the shelf water in summer is considered to be caused by the removal of 228 Th by the scavenging (Yamada and Aono, 2006).…”