Interaction of sea ice sediments and surface sea water in the Arctic Ocean: Evidence from excess 210Pb
Article first published online: 16 JUN 2005
Copyright 2005 by the American Geophysical Union.
Geophysical Research Letters
Volume 32, Issue 12, June 2005
How to Cite
2005), Interaction of sea ice sediments and surface sea water in the Arctic Ocean: Evidence from excess 210Pb, Geophys. Res. Lett., 32, L12601, doi:10.1029/2004GL022191.(
- Issue published online: 16 JUN 2005
- Article first published online: 16 JUN 2005
- Manuscript Accepted: 13 MAY 2005
- Manuscript Revised: 10 MAY 2005
- Manuscript Received: 8 DEC 2004
 We measured the activities of 210Pb, 226Ra, 238U and 137Cs in a suite of ice-rafted sediments (IRS) from the Arctic Ocean in an attempt to assess the interaction of sea ice sediments and surface water. The concentrations of these nuclides were compared to those of the benthic sediments in the coastal and shelf regions of the Arctic Ocean, which are believed to be the major source region for the IRS. The concentration factors (CF = activity of a nuclide in IRS/average activity in benthic sediments) are ∼1 and 4-92 for 137Cs and 210Pb, respectively. The CF values for 137Cs are comparable to the values that can be obtained from the previously published data while we report the first set of high CF values of 210Pb. A major portion of 210Pb in some IRS samples is likely derived from surface waters and thus, the concentrations of 210Pb combined with another particle-reactive radionuclide (such as 7Be, 234Th) in IRS might provide information on the residence time and transit time of sea ice-laden sediments.