Geochemistry of the Albano and Nemi crater lakes in the volcanic district of Alban Hills (Rome, Italy)

Carapezza, Maria Luisa; Lelli, Matteo; Tarchini, Luca

doi:10.1016/j.jvolgeores.2008.06.031

Cited by 38 publications

(28 citation statements)

References 20 publications

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“…Previous studies have shown that the CO 2 concentration at Lake Albano increases with depth, although the maximum measured CO 2 concentrations are much lower than gas saturation (Martini et al 1994;Cioni et al 2003;Anzidei et al 2008;Carapezza et al 2008). More dangerous conditions may have occurred in the past.…”

Section: Introductionmentioning

confidence: 92%

Time-dependent CO2 variations in Lake Albano associated with seismic activity

et al. 2011

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Lake Albano (Alban Hills volcanic complex, Central Italy) is located in a densely populated area near Rome. The deep lake waters have significant dissolved CO 2 concentrations, probably related to sub-lacustrine fluid discharges fed by a pressurized CO 2 -rich reservoir. The analytical results of geochemical surveys carried out in 1989-2010 highlight the episodes of CO 2 removal from the lake. The total mass of dissolved CO 2 decreased from ∼5.8× 10 7 kg in 1989 to ∼0.5×10 7 kg in 2010, following an exponential decreasing trend. Calculated values of both dissolved inorganic carbon and CO 2 concentrations along the vertical profile of the lake indicate that this decrease is caused by CO 2 release from the epilimnion, at depth <9 m, combined with (1) water circulation at depth <95 m and (2) CO 2 diffusion from the deeper lake layers. According to this model, Lake Albano was affected by a large CO 2 input that coincided with the last important seismic swarm at Alban Hills in 1989, suggesting an intimate relationship between the addition of deep-originated CO 2 to the lake and seismic activity. In the case of a CO 2 degassing event of an order of magnitude larger than the one that occurred in 1989, the deepest part of Lake Albano would become CO 2 -saturated, resulting in conditions compatible with the occurrence of a gas outburst. These results reinforce the idea that a sudden CO 2 input into the lake may cause the release of a dense gas cloud, presently representing the major volcanic threat for this densely populated area.

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Section: Introductionmentioning

confidence: 92%

Time-dependent CO2 variations in Lake Albano associated with seismic activity

et al. 2011

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“…Due to the instability of the area resulting from earth tremors and residual thermal activity the possibility of lake-rollover and CO 2 limnic eruption is thought to pose the highest threat of the volcano today (Funiciello et al 2003). Underwater gas springs have been documented from direct observation through bathyscaphe methodologies (Capelli et al 1998) and gas saturation of the bottom waters have been shown from isotopic studies (Carapezza et al 2008). The processes involved in a limnic eruption could follow those of the tragic events that occurred in Lakes Nyos and Monoun in 1996 (Sigurdsson et al 1987;Rice 2000), although CO 2 concentrations at Albano Lake are at much lower levels.…”

Section: Introductionmentioning

confidence: 99%

Water chemistry and trophic evaluation of Lake Albano (Central Italy): a four year water monitoring study

Ellwood

Albertano²,

Galvez‐Cloutier³

et al. 2009

J Limnol

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“…Results of a multi-year study of Lake Albano indicate that an anomalous spike in CO 2 input accompanied a seismic swarm in 1989 (Chiodini et al 2012). Carapezza et al (2008) suggest that a prolonged warm spell without winter-time mixing might allow initiation of stable stratification and gas buildup in this lake, the reverse of a proposed weakening of stratification in Cameroonian lakes due to an unusually cool period in the mid-1980s (Kling 1987b).…”

Section: Global Implicationsmentioning

confidence: 94%

“…Several Italian crater lakes are located in areas of strong CO 2 emission (Chiodini and Frondini 2001), and magmatic gas components have been found in lake waters (Carapezza et al 2008;Caracausi et al 2009;Cabassi et al 2013). The lakes currently pose no hazard of a catastrophic release, but unusual events that might have involved gas releases are recorded in ancient Roman writings (Cioni et al 2003).…”

Section: Global Implicationsmentioning

confidence: 99%

The Comparative Limnology of Lakes Nyos and Monoun, Cameroon

Kling

Evans

Tanyileke

2015

Advances in Volcanology

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Lakes Nyos and Monoun are known for the dangerous accumulation of CO 2 dissolved in stagnant bottom water, but the shallow waters that conceal this hazard are dilute and undergo seasonal changes similar to other deep crater lakes in the tropics. Here we discuss these changes with reference to climatic and water-column data collected at both lakes during the years following the gas release disasters in the mid-1980s. The small annual range in mean daily air temperatures leads to an equally small annual range of surface water temperatures (ΔT *6-7°C), reducing deep convective mixing of the water column. Weak mixing aids the establishment of meromixis, a requisite condition for the gradual buildup of CO 2 in bottom waters and perhaps the unusual condition that most explains the rarity of such lakes. Within the mixolimnion, a seasonal thermocline forms each spring and shallow diel thermoclines may be sufficiently strong to isolate surface water and allow primary production to reduce P CO2 below 300 μatm, inducing a net influx of CO 2 from the atmosphere. Surface water O 2 and pH typically reach maxima at this time, with occasional O 2 oversaturation. Mixing to the chemocline occurs in both lakes during the winter dry season, primarily due to low humidity and cool night time air temperature. An additional period of variable mixing, occasionally reaching the chemocline in Lake Monoun, occurs during the summer

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Geochemistry of the Albano and Nemi crater lakes in the volcanic district of Alban Hills (Rome, Italy)

Cited by 38 publications

References 20 publications

Time-dependent CO2 variations in Lake Albano associated with seismic activity

Time-dependent CO2 variations in Lake Albano associated with seismic activity

Water chemistry and trophic evaluation of Lake Albano (Central Italy): a four year water monitoring study

The Comparative Limnology of Lakes Nyos and Monoun, Cameroon

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