Seasonal changes of ~234Th scavenging in surface water across the western Black Sea: an implication of the cyclonic circulation patterns

摘要

Two seasonal surveys of ~234Th activity in surface water were carried out in November 1998 and June 1999 along the transect Sevastopol (Ukraine)-Istanbul (Turkey) crossing the entire Western Black Sea between the SW Crimean Peninsula and the Bosphorus Strait entry. A steady-state model of ~234Th/~238U equilibrium in seawater was used to calculate the net Removal flux of ~234Th by particles.