Plutonium Marker for the Great Acceleration by Intensified Human Activities

沉积物 缺氧水域 环境科学 放射性核素 清除 沉积(地质) 地质学 化学 海洋学 放射化学 地貌学 物理 生物化学 量子力学 抗氧化剂
作者
Xue Zhao,Xiaolin Hou,Weijian Zhou,Dewen Lei,Yongming Han,Dongna Yan,Huan Jiang,Zhisheng An
出处
期刊:Environmental Science & Technology [American Chemical Society]
标识
DOI:10.1021/acs.est.4c11841
摘要

There has been a sharp rise in the extent and scale of human activities since the mid-20th century, termed the "Great Acceleration", and nuclear activities are one of the defining technological processes for this period. 239,240Pu released by atmospheric nuclear weapons tests provides an ideal chronostratigraphic marker for labeling this change due to its global fallout feature, temporal mutation, and long half-lives. However, the accumulation dynamics of plutonium from atmospheric deposition to preservation in the sediment is still controversial. Three sediment cores collected from two maar lakes with high-quality chronology were analyzed for 239,240Pu. The first high-yield thermonuclear test (31st October 1952) and the highest global tests in 1961–1962 were identified, respectively, as the first rapidly increased 239,240Pu in 1953 and peaked in 1963. In anoxic Lake Sihailongwan (SHLW), scavenging Pu from the water to sediment was accelerated due to the major particulate associated forms of Pu(III) and Pu(IV) and rapidly elevated dust flux when ice-melting occurred in every spring. The desorption of Pu from beneath sediment to the lake water and resorption by sediment particles were stronger in shallow and oxic Lake Huguangyan. Therefore, the first rapid increase of 239,240Pu in 1953 and peak in 1963 accompanied by rapid scavenging and well preservation of plutonium provide a robust time marker for the "Great Acceleration", and this marker nearly permanently exists in such kind of lake sediment similar to Lake SHLW.
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