Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.scitotenv.2012.09.079 |
Assessment of Be-7 content in precipitation in a South American semi-arid environment | |
Juri Ayub, J.1,2; Lohaiza, F.1; Velasco, H.1; Rizzotto, M.1; Di Gregorio, D.3,4; Huck, H.3,4 | |
通讯作者 | Juri Ayub, J. |
来源期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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ISSN | 0048-9697 |
出版年 | 2012 |
卷号 | 441页码:111-116 |
英文摘要 | There are two naturally occurring radiogenic isotopes of beryllium, Be-7 and Be-10. These are produced when cosmic radiation interacts with oxygen and nitrogen in the atmosphere. After production, these radionuclides are input to ecosystems through wet and dry deposition. In recent years Be-7 and Be-10 have proved to be powerful tools for studying dynamic processes that occur on the surface of the earth. We measured the Be-7 content in precipitation at a semiarid location in central Argentina. From November 2006 to March 2009, 68 precipitation events were collected. Measured Be-7 content ranged from 0.7 +/- 0.4 Bq L-1 to 32 +/- 0.7 Bq L-1, with a mean of 1.7 Bq L-1 +/- 0.6 Bq L-1 Beryllium-7 content of rainfall did not show clear relationships with amount of rainfall (mm), mean intensity (mm h(-1)) or duration (h(-1)), or elapsed time between events (day). The general results indicate that for the typical range of precipitation there was no atmospheric washout and that the reload of the atmosphere is not a relevant factor, but when the amount of precipitation is very high washout may occur. On the other hand, when the Be-7 content was measured during single rain events, a high content of this radionuclide was found to be associated with very low rainfall intensity (approximate to 3 mm h(-1)), this suggests that rain intensity could affect the Be-7 content Using all data, a good linear relationship between Be-7 deposition and rain magnitude was obtained (r(2) = 0.82, p<0.0001). Because of this, the slope of this linear regression equation may be applied as a tool for tracing environmental processes that affect the surface of the earth. We can do this by directly estimating erosion/sedimentation processes using Be-7 or by estimating the input of Be-10 in the environment with the aim to evaluate land degradation phenomena. (C) 2012 Elsevier B.V. All rights reserved. |
英文关键词 | Beryllium-7 Wet deposition Be-7 rainwater content Reload rate Precipitation magnitude Rainfall intensity |
类型 | Article |
语种 | 英语 |
国家 | Argentina ; Brazil |
收录类别 | SCI-E |
WOS记录号 | WOS:000312614900012 |
WOS关键词 | SOIL-EROSION ; SURFACE AIR ; BERYLLIUM-7 ; PB-210 ; DEPOSITION ; TRACER ; FALLOUT ; RATES |
WOS类目 | Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/174976 |
作者单位 | 1.Univ Nacl San Luis, CCT San Luis CONICET, Grp Estudios Ambientales, Inst Matemat Aplicada San Luis, San Luis, Argentina; 2.Univ Fed Fluminense, Inst Fis, LARA, Lab Radioecol, BR-24020 Niteroi, RJ, Brazil; 3.Comis Nacl Energia Atom, Dept Fis, RA-1429 Buenos Aires, DF, Argentina; 4.Univ Nacl San Martin, Escuela Ciencia & Tecnol, Buenos Aires, DF, Argentina |
推荐引用方式 GB/T 7714 | Juri Ayub, J.,Lohaiza, F.,Velasco, H.,et al. Assessment of Be-7 content in precipitation in a South American semi-arid environment[J],2012,441:111-116. |
APA | Juri Ayub, J.,Lohaiza, F.,Velasco, H.,Rizzotto, M.,Di Gregorio, D.,&Huck, H..(2012).Assessment of Be-7 content in precipitation in a South American semi-arid environment.SCIENCE OF THE TOTAL ENVIRONMENT,441,111-116. |
MLA | Juri Ayub, J.,et al."Assessment of Be-7 content in precipitation in a South American semi-arid environment".SCIENCE OF THE TOTAL ENVIRONMENT 441(2012):111-116. |
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