Temperature variations in caves induced by atmospheric pressure variations—Part 2: Unveiling hidden thermal signals

Perrier, Frédéric; Bourges, François; Girault, Frédéric; Mouël, Jean‐Louis Le; Genty, Dominique; Lartiges, Bruno; Losno, R.; Bonnet, Stéphane

doi:10.1016/j.geogeo.2022.100146

Cited by 3 publications

(3 citation statements)

References 49 publications

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“…Cave temperatures are known to react "to long term temperature drifts with some delay" 18 , due to the inertia of the rock and fluids infiltration. Therefore, cave temperature is directly influenced by the temperature of the outer atmosphere 25 , and the surface heat transmission through the Earth's upper crust is mainly via conductivity 26,27 .…”

Section: Annual Temperature Variation Patterns In Caves Compared To S...mentioning

confidence: 99%

Temperature variation in caves and its significance for subterranean ecosystems

Medina,

Antić,

Borges

et al. 2023

Sci Rep

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Climate change affects all ecosystems, but subterranean ecosystems are repeatedly neglected from political and public agendas. Cave habitats are home to unknown and endangered species, with low trait variability and intrinsic vulnerability to recover from human-induced disturbances. We studied the annual variability and cyclicity of temperatures in caves vis-à-vis surface in different climatic areas. We hypothesize that cave temperatures follow the average temperature pattern at the surface for each location with a slight delay in the signal, but we found three different thermal patterns occurring in caves: (1) high positive correlation and a similar thermal pattern to the surface, (2) low correlation and a slight thermal delay of the signal from the surface, and (3) high negative correlation with an extreme delay from the surface. We found daily thermal cycles in some caves, which may potentially control the circadian rhythms of cave organisms. Our results show that caves had lower thermal amplitude than the surface, and that thermal averages within caves approximately correspond to the to the annual average of surface temperature. Caves buffer external temperature and act as refugia for biota in extreme climatic events. Likewise, temperature increases at surface will lead to increment in caves, threatening subterranean biota and ecosystem services.

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Section: Annual Temperature Variation Patterns In Caves Compared To S...mentioning

confidence: 99%

Temperature variation in caves and its significance for subterranean ecosystems

Medina,

Antić,

Borges

et al. 2023

Sci Rep

View full text Add to dashboard Cite

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“…In some subsurface cavities, temperature variations of the order of 10 −3 • C are permanently induced by variations in atmospheric pressure [32]. Temperature signals are indicative of transient conditions characterised by several processes that are not necessarily easy to separate, such as transient airflow due to barometric winds or localised convection cells, transient infiltration or energy dissipation due to evaporation-condensation on the rock surface, are observed [32]. The second pressure wave (over the South Pole) at 02:00 CET (01:00 UTC) on 16 January 2022 is about 0.2 hPa and is not visible at all sites, but only at Postojna 2, Otoška Jama 1, Biospeleološka 1, and Koncertna Dvorana (Figure 3).…”

Section: Postojna Cavementioning

confidence: 99%

“…Atmospheric pressure data from the national meteorological archive [15] did not show significant changes even at 30 min measurement intervals for the Cerklje na Dolenjskem station (Figure 1, Table 1). In some subsurface cavities, temperature variations of the order of 10 −3 °C are permanently induced by variations in atmospheric pressure [32]. Temperature signals are indicative of transient conditions characterised by several processes that are not necessarily easy to separate, such as transient airflow due to barometric winds or localised convection cells, transient infiltration or energy dissipation due to evaporation-condensation on the rock surface, are observed [32].…”

Section: Kostanjevica Cavementioning

confidence: 99%

Air Pressure Perturbations in Karst Caves and Waters after the Hunga Tonga–Hunga Ha’apai Volcano Eruption on 15 January 2022

2023

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Microclimatic monitoring (air T, air pressure, CO2, ventilation, humidity, methane, and radon) in selected show caves in Slovenia has been a continuous process for more than 10 years, a process that aims to supervise the use of the caves for tourism in the sense of sustainable environmental management. After the cataclysmic eruption of the Hunga Tonga–Hunga Ha’apai (HTHH) volcano on 15 January 2022, global propagation of ionospheric disturbances was reported worldwide as barometric pressure changes and seismic noise events. Weather stations in Slovenia reported 2–4 hPa changes in atmospheric pressure 16 h after the eruption at 20:30 CET (19:30 UTC). Changes in atmospheric pressure were also detected at 15 air monitoring sites in 3 different caves (20–120 m below the surface), at 8 water monitoring sites in 4 different caves (1–10 m below the water surface), and on the surface (4 air and 2 water monitoring sites), where we identified a small but significant increase in atmospheric pressure of <1 hPa, with the highest signal at 21:00 CET (20:00 UTC). At some cave monitoring locations, air T fell during this global event induced by a far-field volcanic eruption. Cave CO2, methane, and radon measurements did not show significant changes related to the eruption. This is the first evidence of atmospheric pressure changes due to the HTHH volcano eruption in karst caves and waters.

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