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Title
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Insights on climate-driven fluctuations of cave ²²²Rn and CO₂ concentrations using statistical and wavelet analyses
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Author
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Abstract
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| Understanding the fluctuations in cave air concentrations and their climatic control is substantial not only to preserve the quality of indoor atmospheres but also to avoid the risk related to the presence of hazardous substances. In this study, we investigated the most influential factors affecting(222)Rn and CO(2)concentrations, the nature of their dynamics, and their coupling with climatic variations. For this purpose, we combined a set of mathematical methods that included a statistical and wavelet analysis of a 6-year time series in Rull Cave (Spain). Generally, the(222)Rn and CO(2)dynamic in cave air showed similar patterns. However, the obtained results show that these gases have a different frequency response. Thus, the annual component of(222)Rn and CO(2)is controlled by the relationship between external and internal temperatures. At low frequencies, both gases are affected by the same variables when the cave atmosphere reaches a minimum concentration. However, when the cave atmosphere is isolated from the outdoors,Rn-222 and CO(2)behave differently and disturbance caused by the visitors is evidenced in terms of the CO(2)concentration; the latter observation was confirmed by the wavelet analysis at high frequencies. In contrast, the(222)Rn concentration shows important variations following rainfall, which was weakly identified in the CO(2)concentration. |
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Language
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English
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Source (journal)
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Geofluids. - Oxford
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Publication
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Oxford
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2020
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ISSN
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1468-8115
[print]
1468-8123
[online]
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DOI
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10.1155/2020/8858295
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Volume/pages
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2020
(2020)
, 17 p.
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Article Reference
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8858295
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ISI
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000550010500001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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