Seasonal variations of 210 Pb and 210 Po concentrations in an oligotrophic lake

Details Seasonal variations of 210 Pb and 210 Po concentrations in an oligotrophic lake Seasonal variations of 210 Pb and 210 Po concentrations in an oligotrophic lake

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2053t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 10, pp.2053-2063

Mathematics

Logic

4

Scientific paper

The vertical distribution of 210 Pb and 210 Po in the dissolved (<0.4 m) and the paniculate (>0.4 m) phases was measured in Crystal Lake, Wisconsin, to examine the spatial and temporal variability during the seasonal cycle of this oligotrophic lake. The concentration of unsupported 210 Pb in the water column is maintained principally by atmospheric input. However, most of the 210 Po in Crystal Lake is produced in situ from radioactive decay of 210 Pb. Mass balance considerations indicated that the removal rates of 210 Pb and 210 Po from the water column to the sediment varied temporally by nearly an order of magnitude. During transient periods of high biological productivity, a large net flux of these nuclides into the sediment occurred. In addition, 210 Pb was rapidly stripped from the water column during fall turnover. It was during these short-lived events that most of the annual net removal of 210 Pb and 210 Po occurred. The mean removal residence time was estimated to be 0.095 yr for 210 Pb and 0.26 yr for 210 Po. These residence times suggest that there is a difference between 210 Pb and 210 Po in the extent of their recycling in the water column. Calculations indicated that there was a cyclic response of the water column 210 Po inventory corresponding to successive time periods where there was a net loss or net gain. This cycling is attributed to rapid biological removal and subsequent release from the sediment of freshly deposited 210 Po. For 210 Pb, replenishment of the water column appeared to occur mainly from atmospheric input.

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