A multitracer study of peat profiles from Tunguska, Siberia

Tositti, Laura; Mingozzi, Matilde; Sandrini, Silvia; Forlani, Luciano; Buoso, M.C.; Poli, M.; Ceccato, D.; Zafiropoulos, D.

doi:10.1016/j.gloplacha.2006.03.010

Cited by 12 publications

(5 citation statements)

References 29 publications

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“…Therefore, after being produced/emitted to the air, they quickly get associated with ambient aerosol, usually in the accumulation mode (i.e., submicrometric in size), with a residence time of the order of days up to a few weeks. As a result, they are excellent tracers of both atmospheric aerosol (Tositti et al, 2014a;Brattich et al, 2015a, b;, and of atmospheric deposition (Battiston et al, 1987;Bettoli et al, 1995;Tositti et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Deposition processes over complex topographies: Experimental data meets atmospheric modeling

Tositti

Moroni

Dinelli

et al. 2020

Science of The Total Environment

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Section: Introductionmentioning

confidence: 99%

Deposition processes over complex topographies: Experimental data meets atmospheric modeling

Tositti

Moroni

Dinelli

et al. 2020

Science of The Total Environment

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“…For this reason, a number of scientists have recently developed lab testing on larger peat samples, such as 10‐cm diameter × 50–200 cm long columns (e.g. De Vleeschouwer, Chambers, & Swindles, ; Tositti et al, ) or 30‐ to 40‐cm side prismatic monoliths (e.g. Strack & Price, ; Yu, Slater, Schäfer, Reeve, & Varner, ) properly sampled in various peatlands worldwide.…”

Section: Introductionmentioning

confidence: 99%

Thorough wetting and drainage of a peat lysimeter in a climate change scenario

Previati

Canone

Iurato

et al. 2019

Hydrological Processes

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A peat deposit (Zennare basin, Venice coastland, Italy) was monitored in previous field studies to investigate the hydrological response of organic soil to meteorological dynamics. Field tests and modelling predictions highlighted the risk of the complete loss of this peat layer during the next 50 years, due to oxidation enhanced by the increased frequency of warmer periods. Unfortunately, despite the considerable impacts that are expected to affect peat bogs (in this area and worldwide), only a few experimental studies have been carried out to assess the hydrologic response of peat to severe water scarcity. Because of that, an undisturbed 0.7 m 3 peat monolith was collected, transferred to the laboratory and instrumented. The total weight (representative of the water content dynamics of the peat monolith as a whole), and two vertical profiles of matric potentials and water content were monitored in controlled water-scarce conditions. After an extended air-drying period, the monolith was used as an undisturbed peat lysimeter and a complete cycle of wetting and drainage was performed. Supplementary measurements of matric potential ψ and water content θ were collected by testing peat subsamples on a suction table apparatus. A set of water retention curves was determined in a range of matric potentials broader (ψ down to −7 m) than the current natural conditions in the field (minimum ψ = −1 m).While water content at saturation showed values similar to those in the original natural conditions (θ ffi 0.8), a remarkable loss of water holding capacity (even for low potentials) has been highlighted, especially in deep layers that are now permanently below the water table. The retention curves changed shape and values, with a more pronounced hysteresis visible in an increasing distance between wetting and drying data. Hydraulic non-equilibrium between the water content and water potential could be a possible cause and it is worth modelling in future studies. The parameters of the van Genuchten retention curves were obtained for the wetting and the drying phases. K E Y W O R D SPeatland, peat soil hydrology, lysimeter, wetlands, hydro-physical properties, experiment, climate change

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“…• Peat Samples: Analysis of peat samples collected close to the lake show an increase of 15 N in an epoch consistent with 1908, likely due to acid rains caused by an increase of particles suspended into the atmosphere (Kolesnikov et al, 2003;Tositti et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

The atmospheric fragmentation of the 1908 Tunguska Cosmic Body: reconsidering the possibility of a ground impact

Foschini,

Gasperini,

Stanghellini

et al. 2018

Preprint

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The 1908 June 30 Tunguska Event (TE) is one of the best studied cases of cosmic body impacting the Earth with global effects. However, still today, significant doubts are casted on the different proposed event reconstructions, because of shortage of reliable information and uncertainties of available data. In the present work, we would like to revisit the atmospheric fragmentation of the Tunguska Cosmic Body (TCB) by taking into account the possibility that a metre-sized fragment could cause the formation of the Lake Cheko, located at about 9 km North-West from the epicentre. We performed order-of-magnitude calculations by using the classical single-body theory for the atmospheric dynamics of comets/asteroids, with the addition of the fragmentation conditions by Foschini (2001). We calibrated the numerical model by using the data of the Chelyabinsk Event (CE) of 2013 February 15. Our work favours the hypothesis that the TCB could have been a rubble-pile asteroid composed by boulders with very different materials with different mechanical strengths, density, and porosity. Before the impact, a close encounter with the Earth stripped at least one boulder, which fell aside the main body and excavated the Lake Cheko. We exclude the hypothesis of a single compact asteroid ejecting a metre-sized fragment during, or shortly before, the airburst, because there is no suitable combination of boulder mass and lateral velocity.

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A multitracer study of peat profiles from Tunguska, Siberia

Cited by 12 publications

References 29 publications

Deposition processes over complex topographies: Experimental data meets atmospheric modeling

Deposition processes over complex topographies: Experimental data meets atmospheric modeling

Thorough wetting and drainage of a peat lysimeter in a climate change scenario

The atmospheric fragmentation of the 1908 Tunguska Cosmic Body: reconsidering the possibility of a ground impact

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