资源环境科技发展态势分析平台

Modern atmospheric deposition along a west‐east transect in the Atacama Desert, Chile was collected to constrain the meteoric ³⁶Cl/Cl ratio and ³⁶Cl deposition flux. The ³⁶Cl deposition flux had a three‐fold change, from 3.62 (±0.18) to 11.6 (±0.2) atoms m^‐2 s^‐1, going from the coast to the high Andes. The ³⁶Cl deposition was mainly as dry deposition, and the magnitude and differences between sites were attributed to stratosphere‐troposphere transport and chloride deficits by acid displacement, respectively. The meteoric ³⁶Cl/Cl ratios varied greatly from 31.5(±1.1)×10^‐15 to 247(±10)×10^‐15, which was attributed to local inputs of oceanic chloride near the coast or chloride minerals entrained from nearby salt playas. This study presented refined estimates of the ³⁶Cl deposition flux and meteoric ³⁶Cl/Cl ratio in a desert region in southern tropical zone. The dataset will provide a baseline for using natural ³⁶Cl abundances to date salt accumulation in the Atacama.