Radium isotopes in Cayuga Lake, New York: Indicators of inflow and mixing processes

Limnology and Oceanography



Naturally occurring radium isotopes (223Ra, 224Ra, 226Ra, and 228Ra) were measured in lake and tributary water of Cayuga Lake, New York, during the course of a vernal inflow event in the spring of 2001. A large influx of groundwater, probably from a carbonate aquifer, entered the lake at its extreme southern end early in the vernal inflow event and spread northward, covering an extensive part of the southern end of the lake. The low 228Ra/226Ra activity ratio of this water mass, compared with bulk lake water, allowed its identification through time. Estimates of mixing with bulk lake water were calculated from changes in the 226Ra content. Groundwater inflow to the lake around the delta of a major tributary was detected on the basis of 223Ra and 224Ra activity of lake and tributary water. Inflow of a water mass to the surface of the lake was also detected using 223Ra and 224Ra activity. The integrity of this water mass was monitored using short‐lived radium isotopes. Suspended sediment in the lake water is a source of the short‐lived radium isotopes 223Ra (~2 x 10−4dpm L−1) and 224Ra (~3 x x 10−3 dpm L−1), but bottom sediments are a more significant source of 228Ra. Radium isotopes can be valuable new tools in limnological investigations, allowing detection and monitoring of events and processes such as water inflow and mixing, determining sources of inflowing water, and monitoring introduced water masses as they move within the lake.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Radium isotopes in Cayuga Lake, New York: Indicators of inflow and mixing processes
Series title Limnology and Oceanography
DOI 10.4319/lo.2005.50.1.0158
Volume 50
Issue 1
Year Published 2005
Language English
Publisher ASLO
Contributing office(s) Toxic Substances Hydrology Program
Description 11 p.
First page 158
Last page 168
Country United States
State New York
Other Geospatial Cayuga Lake
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