Measurement and Meteorological Analysis of  7Be  and   210Pb in Aerosol at Waliguan Observatory

ZHENG Xiangdong; WAN Guojiang; CHEN Zunyu; TANG Jie

doi:10.1007/s00376-008-0404-y

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Volume 25 Issue 3

May 2008

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2008 > 25(3): 404-416

Measurement and Meteorological Analysis of 7Be and 210Pb in Aerosol at Waliguan Observatory

1.
Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081;State Key Laboratory of Environment Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510080;Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences,China Meteorological Administration, Beijing 100081

doi: 10.1007/s00376-008-0404-y

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Abstract:
Beryllium-7 (7Be) and lead-210 (210Pb) activities were measured from October 2002 to January 2004 at Waliguan Observatory (WO: 36.287N, 100.898E, 3816 m a.s.l (above sea level) in northwest China. 7Be and 210Pb activities are high with overall averages of 14.7±3.5 mBq m-3 and 1.8±0.8 mBq m-3 respectively. For both 7Be and 210Pb, there are significant short-term and seasonal variations with a commonly low value in summer (May--September) and a monthly maximum in April (for 7Be) and in December (for 210Pb). The ratio of 7Be 210Pb showed a broad maximum extending from April to July, coinciding with a seasonal peak in surface ozone (O3). The seasonal cycles of 7Be and 210Pb activities were greatly influenced by precipitation and thermal dynamical conditions over the boundary layer, especially for 210Pb. The vertical mixing process between the boundary layer and the aloft air modulates the variations of 7Be and 210Pb at WO in summer. It is indicated that air mass had longer residence time and originated from higher altitudes at WO in the spring-summer time and the winter in 2003. During an event with extremely high weekly-averaged 7Be concentration (24.8 mBq m-3) together with high O3 levels and low water mixing ratio, we found that air masses had been convectively transported a long distance to WO from high latitude source regions in central Asia, where significant subsiding motions were observed. In another case with the extreme 210Pb activity of 5.7 mBq m-3 high CO2 level and specific humidity (in winter), air masses had come from south China and north Indian regions where 222Rn activities were high. This study, using 7Be and 210Pb as atmospheric tracers, has revealed that complex interactions of convective mixing from the upper troposphere and long-range transports exist at WO.
- 7Be,
- 210Pb,
- Waliguan Observatory
References

[1]	, 2022: 2022-7 Contents, ADVANCES IN ATMOSPHERIC SCIENCES, 39, 1-1.
[2]	YU Yu, CHEN Hongbin, XIA Xiangao, XUAN Yuejian, YU Ke, 2010: Significant Variations of Surface Albedo during a Snowy Period at Xianghe Observatory, China, ADVANCES IN ATMOSPHERIC SCIENCES, 27, 80-86. doi: 10.1007/s00376-009-8151-2
[3]	HUANG Jianping, ZHANG Wu, ZUO Jinqing, BI Jianrong, SHI Jinsen, WANG Xin, CHANG Zhoulin, HUANG Zhongwei, YANG Su, ZHANG Beidou, WANG Guoyin, FENG Guanghong, YUAN Jiuyi, ZHANG Lei, ZUO Hongchao, WANG Shigong, FU Congbin, CHOU Jifan, 2008: An Overview of the Semi-arid Climate and Environment Research Observatory over the Loess Plateau, ADVANCES IN ATMOSPHERIC SCIENCES, 25, 906-921. doi: 10.1007/s00376-008-0906-7
[4]	Yuhan LUO, Yu DU, 2023: The Roles of Low-level Jets in “21·7” Henan Extremely Persistent Heavy Rainfall Event, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 350-373. doi: 10.1007/s00376-022-2026-1
[5]	Anastasia J. TOMANEK, Matthew A. LAZZARA, David E. MIKOLAJCZYK, Taylor P. NORTON, Isabella I. ONSI, David H. BROMWICH, Mariana F. LITELL, 2023: The 17th Workshop on Antarctic Meteorology and Climate and 7th Year of Polar Prediction in the Southern Hemisphere Meeting, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 1722-1729. doi: 10.1007/s00376-023-3049-y
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Manuscript History

Manuscript received: 10 May 2008

Manuscript revised: 10 May 2008

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Measurement and Meteorological Analysis of 7Be and 210Pb in Aerosol at Waliguan Observatory

1. Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081;State Key Laboratory of Environment Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510080;Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences,China Meteorological Administration, Beijing 100081

Manuscript received: 2008-05-10
Manuscript revised: 2008-05-10

Abstract: Beryllium-7 (7Be) and lead-210 (210Pb) activities were measured from October 2002 to January 2004 at Waliguan Observatory (WO: 36.287N, 100.898E, 3816 m a.s.l (above sea level) in northwest China. 7Be and 210Pb activities are high with overall averages of 14.7±3.5 mBq m-3 and 1.8±0.8 mBq m-3 respectively. For both 7Be and 210Pb, there are significant short-term and seasonal variations with a commonly low value in summer (May--September) and a monthly maximum in April (for 7Be) and in December (for 210Pb). The ratio of 7Be 210Pb showed a broad maximum extending from April to July, coinciding with a seasonal peak in surface ozone (O3). The seasonal cycles of 7Be and 210Pb activities were greatly influenced by precipitation and thermal dynamical conditions over the boundary layer, especially for 210Pb. The vertical mixing process between the boundary layer and the aloft air modulates the variations of 7Be and 210Pb at WO in summer. It is indicated that air mass had longer residence time and originated from higher altitudes at WO in the spring-summer time and the winter in 2003. During an event with extremely high weekly-averaged 7Be concentration (24.8 mBq m-3) together with high O3 levels and low water mixing ratio, we found that air masses had been convectively transported a long distance to WO from high latitude source regions in central Asia, where significant subsiding motions were observed. In another case with the extreme 210Pb activity of 5.7 mBq m-3 high CO2 level and specific humidity (in winter), air masses had come from south China and north Indian regions where 222Rn activities were high. This study, using 7Be and 210Pb as atmospheric tracers, has revealed that complex interactions of convective mixing from the upper troposphere and long-range transports exist at WO.

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