| Excess polonium-210 in the coastal atmosphere originating from marine biogenic material |
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| 作者姓名： | YANG Weifeng CHEN Min HUANG Yipu LIU Guangshan JIA Chengxia |
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| 作者单位： | YANG Weifeng 1，CHEN Min 1，2 *，HUANG Yipu 1，2，LIU Guangshan 1，2，JIA Chengxia 1 1. Department of Oceanography，Xiamen University，Xiamen 361005，China 2. State Key Laboratory of Marine Environmental Science，Xiamen University，Xiamen 361005，China |
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| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划(973计划) |
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| 摘 要： | 1Introduction In the atmosphere, gaseous radon-222 (t1/2=3.8 d) produces a series of decay products,lead-210(t1/2=22.3 a), bismuth-210 (t1/2=5.01 d), andpolonium-210 (t1/2=138.4 d), etc. These radondaughters are readilyadsorbed onto aerosols and thengrowd…
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| 关 键 词： | 海洋地球化学 钋 厦门市 沉积物 |
| 收稿时间： | 2006-01-20 |
| 修稿时间： | 2006-07-21 |
Excess polonium-210 in the coastal atmosphere originating from marine biogenic material |
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| YANG Weifeng,CHEN Min,HUANG Yipu,LIU Guangshan,JIA Chengxia.Excess polonium-210 in the coastal atmosphere originating from marine biogenic material[J].Acta Oceanologica Sinica,2006,25(6):78-87. |
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| Authors: | YANG Weifeng CHEN Min HUANG Yipu LIU Guangshan and JIA Chengxia |
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| Institution: | 1.Department of Oceanography, Xiamen University, Xiamen 361005, China2.Department of Oceanography, Xiamen University, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China |
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| Abstract: | The depositional fluxes of atmospheric polonium-210 were measured at one site in Xiamen from August 2001 to March 2002. With predominant marine air mass, the depositional fluxes of atmospheric polonium-210 ranged from 0.01 to 0.09 Bq/(m2·d), with an average of 0.04 Bq/(m2·d). The seasonal pattern showed elevated polonium-210 fluxes in summer and autumn rather than in winter. Atmospheric depositional fluxes of polonium-210 showed a good correlation with beryllium-7 (r2=0.85) and lead-210 fluxes (r2=0.71), indicating their similar removal mechanism from atmosphere. The relationship between the polonium-210 depositional fluxes and the precipitation amount demonstrated that the precipitation dominates the polonium-210 removal from the atmosphere. The observed high activity ratios of polonium-210 to lead-210 indicated the occurrence of excess polonium-210 in coastal atmosphere, which may originate from marine surface waters either by indirect (foam), or more likely, direct (air-sea exchange) input of marine biogenic material into the atmosphere. This source is even more important than the in situ decay of lead-210. |
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| Keywords: | excess polonium-210 depositional flux coastal atmosphere precipitation |
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