Gordo E, Liger E, Dueñas C, Fernández M C, Cañete S, Pérez M
Central Research Facilities, Universidad de Málaga, 29071 Málaga, Spain.
Department of Applied Physics II, Technical College of Informatic Engineering, Universidad de Málaga, 29071 Málaga, Spain.
J Environ Radioact. 2015 Oct;148:141-53. doi: 10.1016/j.jenvrad.2015.06.028. Epub 2015 Jul 9.
The relationship between the particulate matter in the atmosphere of Malaga and the origin of air masses with special attention to African intrusions was analyzed. The concentrations of PM10 and the activities of some radionuclides ((7)Be and (210)Pb) as tracers of these intrusions are discussed. The origin of these radiotracers is completely different. (210)Pb is a good tracer of air masses traveling close to the ground and come from inland areas. On the other hand, the production of (7)Be is very low in the vicinity of the Earth's surface, and increases with altitude, making it a great tracer of stratospheric air masses in the troposphere. Studies of radionuclide activities in aerosol particles provide a means for evaluating the integrated effects of transport and meteorology on the atmospheric loadings of substances with different sources. Measurements of aerosol mass concentration and specific activities of (7)Be and (210)Pb in aerosols at Malaga (36° 43' 40″ N; 4° 28' 8″ W) for the period 2009-2011 were used to obtain the relationships between radionuclide activities and airflow patterns by comparing the data grouped by air mass trajectory. The average concentration values of (7)Be and (210)Pb over the 3-year period have been found to be 5.05 and 0.55 mBq m(-3), respectively, with mean aerosol mass concentration of 53.6 μg m(-3). Taking into account the outbreaks of the daily values limits of PM10 in the study period (2009-2011), the origin of air masses is studied to explain three different situations of both radionuclides (7)Be and (210)Pb: 1) high concentrations of (7)Be and low concentrations of (210)Pb; 2) high concentrations of (210)Pb and low concentrations of (7)Be and 3) high concentrations of (7)Be and (210)Pb.
分析了马拉加市大气中的颗粒物与气团来源之间的关系，特别关注了非洲气团的入侵。讨论了作为这些入侵气团示踪剂的PM10浓度以及一些放射性核素（（7）Be和（210）Pb）的活度。这些放射性示踪剂的来源完全不同。（210）Pb是贴近地面移动且来自内陆地区气团的良好示踪剂。另一方面，（7）Be在地球表面附近的生成量非常低，且随海拔升高而增加，这使其成为对流层中平流层气团的良好示踪剂。气溶胶颗粒中放射性核素活度的研究为评估传输和气象对不同来源物质大气负荷的综合影响提供了一种手段。利用2009 - 2011年期间在马拉加（北纬36°43′40″；西经4°28′8″）对气溶胶中气溶胶质量浓度以及（7）Be和（210）Pb比活度的测量数据，通过比较按气团轨迹分组的数据，得出放射性核素活度与气流模式之间的关系。在这3年期间，（7）Be和（210）Pb的平均浓度值分别为5.05和0.55 mBq m⁻³，平均气溶胶质量浓度为53.6 μg m⁻³。考虑到研究期间（2009 - 2011年）PM10日值限值的爆发情况，研究气团来源以解释（7）Be和（210）Pb这两种放射性核素的三种不同情况：1）（7）Be高浓度和（210）Pb低浓度；2）（210）Pb高浓度和（7）Be低浓度；3）（7）Be和（210）Pb高浓度。
