Distribution of ~137Cs in the Lena River Estuary-Laptev Sea System

摘要

Surface sediment samples in the Laptev Sea have average ~137Cs content of 7.1 Bq kg~-1,a value intemediate between that of the western Kara Sea (23 Bq kg~-1) and the East Siberian Sea (4.2 Bq kg~-1). Both surface sediment content And sediment inventory of ~137Cs in the Laptev Sea sedi- Ments show significant variability, and the influence of a Variety of environmental factors. ~137Cs concentrations in The Laptev Sea surface sediments range from 0.8 to 16 Bq Kg~-1. There is a marked increase in ~137Cs content of Surface sediment samples collected near the Lena River Delta, and a local enrichment in the ~137Cs inventories at These sites is also evident. Fine-grained mixed-layer illite/ Smectite rich sediment sin the estuary provide effective Adsorption sites to fix ~137Cs, in spite of desorption pro- Cesses associated with low salinities in estuarine mixing.