| YANG Weifeng,CHEN Min,HUANG Yipu,LIU Guangshan,JIA Chengxia. 2006. Excess polonium-210 in the coastal atmosphere originating from marine biogenic material. Acta Oceanologica Sinica, (6):78－87 |
| Excess polonium-210 in the coastal atmosphere originating from marine biogenic material |
| Excess polonium-210 in the coastal atmosphere originating from marine biogenic material |
| Received:January 20, 2006 Revised:July 21, 2006 |
| DOI： |
| Key words:excess polonium-210 depositional flux coastal atmosphere precipitation |
| 中文关键词: excess polonium-210 depositional flux coastal atmosphere precipitation |
| 基金项目: |
| Author Name | Affiliation | E-mail | | YANG Weifeng | Department of Oceanography, Xiamen University, Xiamen 361005, China | | | CHEN Min | Department of Oceanography, Xiamen University, Xiamen 361005, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | mchen@xmu.edu.cn | | HUANG Yipu | Department of Oceanography, Xiamen University, Xiamen 361005, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | LIU Guangshan | Department of Oceanography, Xiamen University, Xiamen 361005, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | JIA Chengxia | Department of Oceanography, 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. |
| 中文摘要: |
| 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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