Seasonal temperature variations controlling cave ventilation processes in Cueva Larga, Puerto Rico

Vieten, Rolf; Winter, Amos; Warken, Sophie; Schröder‐Ritzrau, Andrea; Miller, Thomas E.

doi:10.5038/1827-806x.45.3.1983

Cited by 30 publications

(33 citation statements)

References 19 publications

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“…Environmental monitoring of Larga cave commenced in 2012. Previous studies have identified seasonal cave ventilation changes in this cave (Vieten et al, ), and preliminary data from two drip sites imply that they are fed by seepage water which might take years to travel from the surface to the cave (Vieten et al, ). Here monthly observations from six drip sites, sampled between 2012 and 2015, are presented.…”

Section: Introductionmentioning

confidence: 87%

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Hurricane Impact on Seepage Water in Larga Cave, Puerto Rico

et al. 2018

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Hurricane‐induced rainfall over Puerto Rico has characteristic δ18O values which are more negative than local rainfall events. Thus, hurricanes may be recorded in speleothems from Larga cave, Puerto Rico, as characteristic oxygen isotope excursions. Samples of 84 local rainfall events between 2012 and 2013 ranged from −6.2 to +0.3‰, whereas nine rainfall samples belonging to a rainband of hurricane Isaac (23–24 August 2012) ranged from −11.8 to −7.1‰. Cave monitoring covered the hurricane season of 2014 and investigated the impact of hurricane rainfall on drip water chemistry. δ18O values were measured in cumulative monthly rainwater samples above the cave. Inside the cave, δ18O values of instantaneous drip water samples were analyzed and drip rates were recorded at six drip sites. Most effective recharge appears to occur during the wet months (April–May and August–November). δ18O values of instantaneous drip water samples ranged from −3.5 to −2.4‰. In April 2014 and April 2015 some drip sites showed more negative δ18O values than the effective rainfall (−2.9‰), implying an influence of hurricane rainfall reaching the cave via stratified seepage flow months to years after the event. Speleothems from these drip sites in Larga cave have a high potential for paleotempestology studies.

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Section: Introductionmentioning

confidence: 87%

“…Glass slides deposited below these drip sites show evidence of active calcite precipitation. The drip sites are located in the distant part of the cave, where the air temperature is constant and relative humidity is near 100% (Vieten et al, ). These are preferred conditions to retrieve speleothem climate records (Fairchild & Baker, ).…”

Section: Methodsmentioning

confidence: 99%

Hurricane Impact on Seepage Water in Larga Cave, Puerto Rico

et al. 2018

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“…The virtual temperature calculation included CO 2 effects which are not measured systematically in the present study. Nevertheless, it is not clear if the CO 2 concentration (or P CO 2 ) contributes to the driving force (see the opposite analysis of Vieten et al (2016) and Peyraube et al (2017)). A more precise discussion about the CO 2 effect in our case is presented at the next subsection.…”

Section: Annual Inversionsmentioning

confidence: 88%

“…Many others authors introduce the virtual temperature (Sánchez-Cañete et al 2013;Faimon et al 2012;Vieten et al 2016) instead of the Rayleigh number to estimate the driving force. The virtual temperature calculation included CO 2 effects which are not measured systematically in the present study.…”

Section: Annual Inversionsmentioning

confidence: 99%

Evidence of daily and seasonal inversions of airflow in Petites Dales cave, Normandy, France

Masséi¹,

Magne²,

Rodet³

et al. 2017

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-Pierre Viard: Dnevni in sezonski obrati smeri zračnega toka v jami Petites Dales, Normandija, Francija V članku poročamo o podrobni mikroklimatski študiji v jami Petites Dales. V jami z enim samim vhodom smo dve leti opazovali temperaturo, vlago in porazdelitev zračnih tokov. Podrobne dnevne meritve temperature in zračnega toka kažejo na stratifikacijo in dnevni obrat smeri toka. Poleti zunanji zrak vdira v jamo pri stropu, pozimi pa pri tleh. Pri tem se pri vhodu oblikuje profil hitrosti zraka v obliki črke S, globlje v jami pa konvekcijska zanka. V vmesnih obdobjih lahko pride do preklapljanja iz dotoka pod stropom v dotok pri dnu in obratno, kar v članku obravnavamo z vidika termodinamike. V tej raziskavi smo prvič pojasnili dnevne obrate smeri zraka v primerljivih jamah. Študije jamske mikroklime so pomembne za razumevanje jamskega ekosistema, procesov v jamah ter človekovega vpliva nanje. Ključne besede: jama, mikroklima, kras, zračni tok, temperatura, spremenljivost. -entrance is presented in this paper. Two years of cave monitoring investigate temperature, weight of water vapour and airflow distributions outside and inside the cavity to determine the global behaviour of the karst cave. In addition, daily measurements of temperature and airflow demonstrate clearly the stratification of the air and inversions of the airflow during day-time. The cave air is intensively exchanged with external air during the years, with two main modes: (i) airflow enters from the ceiling during summer period and (ii) airflow enters from the floor during winter. At the entrance, an Sshaped velocity profile was observed and far from the entrance, convection loops were observed. During the other period of the year, the airflows may switch from top to bottom or conversely. The thermodynamic conditions of switching are discussed in this paper. This study provided for the first time evidence of daily airflow inversion. Study of cave climates is required in the comprehension of cave flora and fauna, thermodynamic conditions for karst processes underground, hydrogeological features of speleothems, human impact when caves are visited.

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“…Caves are a result of karstification and they are specific parts of vadose zone where external atmosphere air mixes with vadose zone air (Baldini et al, 2006). Depending on numerous processes and conditions (e.g., temperature, pressure gradient, wind direction, cave geometry), the cave air CO 2 undergoes variations throughout the year, though normally is more concentrated than the open atmosphere level (Kowalczk & Froelich, 2010;Fairchild & Baker, 2012;Gregorič et al, 2013;Pflitsch & Piasecki, 2003;Geiger, 1961;Vieten et al, 2016b;Baldini, 2010;Benavente et al, 2010;Bourges et al, 2014;Breecker et al, 2012;Fernández-Cortés et al, 2011, 2015Mattey et al, 2016, among others).…”

Section: Introductionmentioning

confidence: 99%

First assessment on the air CO2 dynamic in the show caves of tropical karst, Vietnam

Trinh¹,

Trinh²,

Fernández-Cortés³

et al. 2018

IJS

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Abstract:In this study, air, water, and host rock in show caves in a Vietnam's karst region was monitored and analyzed to identify the ventilation regime and track the cave air CO 2 sources. In general, the studied caves are well ventilated. In dynamic -multiple entrance caves, air ventilation is described with the use of U shape model. In static -single entrance cave, air circulation is explained by cold air trap model. Both ventilation models suggest that air is more circulated in winter than in summer. Seasonally, the cave air CO 2 increases from early spring to summer. Value in the deepest part of the single-entrance cave is approximately 1,000 ppmv and 8,000 ppmv in early spring and summer, respectively. In multiple-entrance and wet caves, CO 2 level is fairly constant all over the show section, increasing from 500 ppmv in early spring to 2,000 ppmv in summer. Data of microclimate, CO 2 content, and particularly δ 13 C show that cave air, particularly in single entrance cave, has higher CO 2 concentration during summer due to a stagnation of cave air circulation and an elevated CO 2 input from soil and epikarst. The cave air CO 2 increase is also observed after intense rainfalls. A factor that increase cave air CO 2 in show caves during the festive days could probably be huma n exhaling but the extent of human factor in these studied cave systems should be further investigated. Cave waters including cave pools and streams mediate CO 2 level in wet caves. Above all, the atmospheric fraction of CO 2 is always dominant (>60%) in all cave sections.Phong Nha -Ke Bang, microclimate, cave air ventilation, soil air CO 2 , human exhaling

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Seasonal temperature variations controlling cave ventilation processes in Cueva Larga, Puerto Rico

Cited by 30 publications

References 19 publications

Hurricane Impact on Seepage Water in Larga Cave, Puerto Rico

Hurricane Impact on Seepage Water in Larga Cave, Puerto Rico

Evidence of daily and seasonal inversions of airflow in Petites Dales cave, Normandy, France

First assessment on the air CO2 dynamic in the show caves of tropical karst, Vietnam

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