Regional calibration of erosion radiotracers (210Pb and 137Cs): atmospheric fluxes to soils (northern Spain).
Inventories of radionuclides commonly used to study environmental processes, especially in erosion research, were determined in soil cores from two distant river basins in northern Spain. Results showed that 210Pb atmospheric fluxes correlate very well with mean annual rainfall across the region, and this is also the case for 137Cs inventories but only on the basin scale. Therefore we suggest that 210Pb is a better candidate as a radiotracer for soil erosion studies. In this region, the equation 210Pb flux (Bq m(-2) yr(-1)) = (0.19 +/- 0.02) x rainfall (mm yr(-1)) - (24 +/- 17) can be used as a calibration to estimate input 210Pb fluxes, a key parameter in soil erosion studies and models, when mean annual rainfall is known.
Sanchez-Cabeza
Joan-Albert
JA
Universitat Autònoma de Barcelona, Spain. j.a.sanchez@iaea.org
Garcia-Talavera
Marta
M
Costa
Eduard
E
Peña
Victor
V
Garcia-Orellana
Jordi
J
Masqué
Pere
P
Nalda
Constantino
C
D002588:Cesium Radioisotopes / Q000032:analysis*; D004784:Environmental Monitoring; D007856:Lead Radioisotopes / Q000032:analysis*; D011891:Rain; D012987:Soil / Q000032:analysis*; D013030:Spain
D002588:Cesium Radioisotopes; D007856:Lead Radioisotopes; D012987:Soil