The Arctic Oscillation (AO) accounts for a large fraction of recent decadal climate trends in Northern Hemisphere (NH) high latitudes. In East Asia, an elevated AO index (AOI) was associated with warmer temperatures in middle- to high-latitude regions, colder temperatures over low-latitude regions, and elevated ozone intrusion from the stratosphere. Elevated beryllium-7 (⁷Be) is produced in the stratosphere. Few studies have discussed the relationship between ⁷Be and the AO. Here, we identify the AO signature in ⁷Be and lead (Pb)-210 observed at a tropical ambient monitoring site in Nanning (22.8°N, 108.5°E) during the December 2014–December 2017 period. Our results show that the ⁷Be and ²¹⁰Pb concentrations are positively and significantly correlated with the AOI (P < 0.01). These results show that elevated ⁷Be and ²¹⁰Pb are associated with an increase in the AOI, reflecting air masses originating from NH high latitudes and vertically from the high-latitude upper troposphere and lower stratosphere regions to tropical latitudes in East Asia. These results have been verified with ozonesonde data without seasonality and with two meteorological data sets. Our results are also confirmed by observational data over the Pacific regions. We conclude that the AO exerts impacts over the tropical regions in East Asia, and ⁷Be can be used as a tracer to track the impacts of the AO.

北极涛动（AO）占北半球（NH）高纬度最近十年气候趋势的很大一部分。在东亚，AO指数（AOI）升高与中高纬度地区的温度升高，低纬度地区的温度较低以及来自平流层的臭氧侵入量增加有关。在平流层中产生了升高的铍7（⁷ Be）。很少有研究讨论⁷ Be与AO之间的关系。在这里，我们确定了2014年12月至2017年12月期间在南宁一个热带环境监测站（北纬22.8°，东经108.5°）观察到的⁷ Be和铅（Pb）-210中的AO特征。我们的结果表明⁷ Be和²¹⁰铅的浓度与AOI呈显着正相关（P  <0.01）。这些结果表明，⁷ Be和²¹⁰ Pb的升高与AOI的增加有关，反映了源自NH高纬度和垂直方向从高纬度对流层和低平流层区域到东亚热带纬度的空气质量。这些结果已经用没有季节变化的臭氧探空仪数据和两个气象数据集进行了验证。太平洋地区的观测数据也证实了我们的结果。我们得出的结论是，AO对东亚的热带地区产生了影响，并且⁷ Be可以用作追踪AO影响的示踪剂。