Publication Date:
2024-05-09
Description:
Lake Albano (Alban Hills volcanic complex,
Central Italy) is located in a densely populated area near
Rome. The deep lake waters have significant dissolved CO2
concentrations, probably related to sub-lacustrine fluid discharges
fed by a pressurized CO2-rich reservoir. The analytical
results of geochemical surveys carried out in 1989 2010 highlight the episodes of CO2 removal from the lake.
The total mass of dissolved CO2 decreased from ∼5.8×
107 kg in 1989 to ∼0.5×107 kg in 2010, following an
exponential decreasing trend. Calculated values of both dissolved
inorganic carbon and CO2 concentrations along the
vertical profile of the lake indicate that this decrease is
caused by CO2 release from the epilimnion, at depth 〈9 m,
combined with (1) water circulation at depth 〈95 m and (2)
CO2 diffusion from the deeper lake layers. According to this
model, Lake Albano was affected by a large CO2 input that
coincided with the last important seismic swarm at Alban
Hills in 1989, suggesting an intimate relationship between
the addition of deep-originated CO2 to the lake and seismic
activity. In the case of a CO2 degassing event of an order of
magnitude larger than the one that occurred in 1989, the
deepest part of Lake Albano would become CO2-saturated,
resulting in conditions compatible with the occurrence of a
gas outburst. These results reinforce the idea that a sudden
CO2 input into the lake may cause the release of a dense gas
cloud, presently representing the major volcanic threat for
this densely populated area
Description:
Published
Description:
861-871
Description:
2.4. TTC - Laboratori di geochimica dei fluidi
Description:
4.5. Studi sul degassamento naturale e sui gas petroliferi
Description:
JCR Journal
Description:
reserved
Keywords:
Crater lakes
;
Limnic eruption
;
CO2 outburst
;
Lake Albano
;
03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
;
04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration
;
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
