Recent 137Cs deposition in sediments of Admiralty Bay, Antarctica

被引：12
|
作者：
Sanders, Christian J. [1 ]
Santos, Isaac R. [2 ]
Patchineelam, Sambasiva R. [1 ]
Schaefer, Carlos [3 ]
Silva-Filho, Emmanoel V. [1 ]
机构：
[1] Univ Fed Fluminense, Dept Geoquim, BR-24020007 Niteroi, RJ, Brazil
[2] So Cross Univ, Sch Environm Sci & Management, Ctr Coastal Biogeochem, Lismore, NSW 2480, Australia
[3] Univ Fed Vicosa, Dept Solos, BR-36570000 Vicosa, MG, Brazil
来源：
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY | 2010年 / 101卷 / 05期
关键词：
Pb-210 Sedimentation rate; Global warming; Melt-water; Soils; SOUTH SHETLAND ISLANDS; KING-GEORGE-ISLAND; GEOCHRONOLOGIES; RADIONUCLIDES; RADIOACTIVITY; PB-210; SOILS;
D O I：
10.1016/j.jenvrad.2010.02.006
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Cesium-137, radium-226 and lead-210 profiles of a 25 cm sediment core give an indication of recent changes in land ocean interactions at a polar coastal environment (Admiralty Bay, King George Island, Antarctica). The linear sedimentation accumulation rate at the study site calculated from the unsupported Pb-210 profile was 6.7 mm/year from 1965 to 2005. A 3.5-fold increase in Cs-137 concentrations was observed in the top layer of this sediment core. This sharp increase seems to indicate a recent redistribution of fallout radionuclides previously deposited on soil, vegetation and snow. These results imply enhanced land ocean interactions at this site likely as a result of climate change. Because our results are based on a single core, additional investigations are needed to confirm our observations. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：421 / 424
页数：4
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