10Be/7Be is a stratospheric sensitive tracer.In this paper,measurements of 10Be/7Be and surface O3 from October 2005 to May 2006 at Mt.Waliguan (hereafter WLG,100.898°E,39.287°N,3810 m,a.s.l.),China global a...10Be/7Be is a stratospheric sensitive tracer.In this paper,measurements of 10Be/7Be and surface O3 from October 2005 to May 2006 at Mt.Waliguan (hereafter WLG,100.898°E,39.287°N,3810 m,a.s.l.),China global atmospheric watch (GAW) observatory,are introduced and used to investigate the stratosphere-troposphere transport (STT) and its impact on surface O3 on the Tibetan Plateau.The results show that the magnitude of STT is weak in winter,followed by strengthening from the end of winter to the middle of spring (from mid February to mid April) with large increases in 10Be,7Be,10Be/7Be and surface O3.At the end of spring (from the end of April to mid May in this paper),the STT weakened,and the continuous increase of surface O3 at WLG is produced by tropospheric photochemistry reactions.展开更多
The ^10Be/^7Be ratio is a sensitive tracer for the study of atmospheric transport, particularly with regard to stratosphere-troposphere exchange. Measurements with high accuracy and efficiency are crucial to ^7Be and ...The ^10Be/^7Be ratio is a sensitive tracer for the study of atmospheric transport, particularly with regard to stratosphere-troposphere exchange. Measurements with high accuracy and efficiency are crucial to ^7Be and ^10Be tracer studies. This article describes sample preparation procedures and analytical benchmarks for ^7Be and ^10Be measurements at the Xi＇an Accelerator Mass Spectrometry（Xi＇an-AMS） laboratory for the study of rainwater samples. We describe a sample preparation procedure to fabricate beryllium oxide（Be O） AMS targets that includes co-precipitation, anion exchange column separation and purification. We then provide details for the AMS measurement of ^7Be and ^10Be following the sequence BeO^-→Be^2＋→Be^4＋ in the Xi＇an- AMS. The ^10Be/^7Be ratio of rainwater collected in Xi＇an is shown to be about 1.3 at the time of rainfall. The virtue of the method described here is that both ^7Be and ^10Be are measured in the same sample, and it is suitable for routine analysis of large numbers of rainwater samples by AMS.展开更多
基金supported by the National Science Foundation of China (40575013,40175032 and 40830102)
文摘10Be/7Be is a stratospheric sensitive tracer.In this paper,measurements of 10Be/7Be and surface O3 from October 2005 to May 2006 at Mt.Waliguan (hereafter WLG,100.898°E,39.287°N,3810 m,a.s.l.),China global atmospheric watch (GAW) observatory,are introduced and used to investigate the stratosphere-troposphere transport (STT) and its impact on surface O3 on the Tibetan Plateau.The results show that the magnitude of STT is weak in winter,followed by strengthening from the end of winter to the middle of spring (from mid February to mid April) with large increases in 10Be,7Be,10Be/7Be and surface O3.At the end of spring (from the end of April to mid May in this paper),the STT weakened,and the continuous increase of surface O3 at WLG is produced by tropospheric photochemistry reactions.
基金Supported by National Natural Science Foundation of China(11205161)CAS Key Technology Talent Program
文摘The ^10Be/^7Be ratio is a sensitive tracer for the study of atmospheric transport, particularly with regard to stratosphere-troposphere exchange. Measurements with high accuracy and efficiency are crucial to ^7Be and ^10Be tracer studies. This article describes sample preparation procedures and analytical benchmarks for ^7Be and ^10Be measurements at the Xi＇an Accelerator Mass Spectrometry（Xi＇an-AMS） laboratory for the study of rainwater samples. We describe a sample preparation procedure to fabricate beryllium oxide（Be O） AMS targets that includes co-precipitation, anion exchange column separation and purification. We then provide details for the AMS measurement of ^7Be and ^10Be following the sequence BeO^-→Be^2＋→Be^4＋ in the Xi＇an- AMS. The ^10Be/^7Be ratio of rainwater collected in Xi＇an is shown to be about 1.3 at the time of rainfall. The virtue of the method described here is that both ^7Be and ^10Be are measured in the same sample, and it is suitable for routine analysis of large numbers of rainwater samples by AMS.
