Monitoring Surface 10Be/7Be Directly Reveals Stratospheric Air Intrusion in Sichuan Basin, China
Monitoring Surface 10Be/7Be Directly Reveals Stratospheric Air Intrusion in Sichuan Basin, China
复制标题
DOI：
10.1029/2022jd036543
复制
发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Xuke Liu;Yunchong Fu;Yanting Bi;Li Zhang;Guoqing Zhao;F. Xian;Weijian Zhou
中科院分区：
文献类型：
--
作者：
Xuke Liu;Yunchong Fu;Yanting Bi;Li Zhang;Guoqing Zhao;F. Xian;Weijian Zhou
平流层空气入侵会破坏影响大气的化学物质和辐射等大气性质的平衡。大气中的7Be和10Be主要产生于平流层下部和对流层上部之间，并吸附在气溶胶上输送，是大气质量输送的良好示踪剂。用加速器质谱仪同时测定了气溶胶中的7Be和10Be，剔除尘埃10Be干扰后，获得了成都(中国盆地的主要城市)全年7Be和10Be的日分辨率。通过直接观测地面10Be/7Be比值，实现了对四川盆地地区平流层大气入侵的长周期追踪。证实了平流层大气入侵对四川盆地地面臭氧和大气水汽的影响，发现平流层大气入侵程度春季和夏季明显高于秋季和冬季。结果表明，高分辨率的10Be/7Be能为大气垂直运动提供有效和精确的示踪剂。新的7Be和10Be观测记录有助于评估四川盆地平流层空气入侵对环境和气候的影响。
Stratospheric air intrusion can break the balance of atmospheric properties such as chemicals and radiation affecting the atmosphere. The meteoric cosmogenic 7Be and 10Be are mainly produced between the lower stratosphere and the upper troposphere and then adsorbed on aerosols for transport, they are good tracers of the atmospheric mass transport. Here, 7Be and 10Be in aerosols were measured simultaneously by accelerator mass spectrometry, and after removing dust 10Be interference, daily resolution 7Be and 10Be for the whole year in Chengdu (a major city in the Sichuan Basin of China) was obtained. The long‐period tracing of stratospheric air intrusion in the Sichuan Basin area is realized by directly observing the surface 10Be/7Be ratio. This work confirms the influence of stratospheric air intrusion on the surface O3 and atmospheric water vapor in the Sichuan Basin and finds that the stratospheric air intrusion degree in spring and summer is significantly higher than that in autumn and winter. The results indicate that high‐resolution 10Be/7Be can provide effective and refined tracers for the atmospheric vertical motion. The new 7Be and 10Be observation records contribute to evaluating the impact on the environment and climate during the stratospheric air intrusion in the Sichuan Basin.