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| 1 | Measurement and Meteorological Analysis of 7Be and 210pb in Aerosol at Waliguan Observatory显示文摘Beryllium-7(~7Be)and lead-210(^(210)pb)activities were measured from October 2002 to January 2004 at Waliguan Observatory(WO:36.287°N,100.898°E,3816 m a.s.l(above sea level)in northwest China.~7Be and ^(210)Pb 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 ^(210)Pb,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^(210)Pb). The ratio of ~7Be/^(210)pb showed a broad maximum extending from April to July,coinciding with a seasonal peak in surface ozone(O_3).The seasonal cycles of ~7Be and ^(210)Pb activities were greatly influenced by precipitation and thermal dynamical conditions over the boundary layer,especially for ^(210)Pb.The vertical mixing process between the boundary layer and the aloft air modulates the variations of ~7Be and ^(210)pb 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 O_3 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 ^(210)pb activity of 5.7 mBq m^(-3)high CO_2 level and specific humidity(in winter),air masses had come from south China and north Indian regions where ^(222)Rn activities were high.This study,using ~7Be and ^(210)Pb as atmospheric tracers,has revealed that complex interactions of convective mixing from the upper troposphere and long-range transports exist at WO. | 郑向东 万国江 陈尊裕 汤洁 | 2008 | Advances in Atmospheric Sciences2008，25，3： | 5 |
| 2 | 应用^(210)Pb技术计算年轻石笋沉积速率及判断石笋沉积环境显示文摘通过对桂林周边3个洞穴的3个石笋进行^(210)Pb测试,分别计算出3个石笋的沉积速率:盘龙洞石笋PL-4的平均沉积速率为0.042mm/a,茅茅头大岩石笋DY-2的平均沉积速率为0.731mm/a,住岩石笋ZY-5的平均沉积速率为0.029mm/a;另外,通过滴水实验验证了石笋正在沉积,且茅茅头大岩沉积速率较大,盘龙洞和住岩沉积速率较小。通过与其他地区石笋以及对3个洞穴石笋之间的初始^(210)Pb放射性比活度的比较,发现桂林地区石笋初始^(210)Pb放射性比活度低,主要是受制于桂林特殊的地质背景和地理环境;而3个洞穴由于洞穴封闭条件、石笋沉积速率、滴水点等差异,石笋的初始^(210)Pb放射性比活度也表现出差异。 | 殷建军 覃嘉铭 林玉石 王华 唐伟 | 2011 | 第四纪研究2011，31，5： | 2 |
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