Atmospheric deposition chemistry in a subalpine area of the Julian Alps, North-West Slovenia

Muri, Gregor

doi:10.4081/jlimnol.2013.e23

Cited by 10 publications

(9 citation statements)

References 25 publications

(35 reference statements)

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“…Among the nitrogen forms, they found abundant NO 3 − , NH 4 + , and organic nitrogen. Similar results for nitrogen and sulfur deposition in the Alps were reported by Rogora et al (2006), Balestrini et al (2013), and Muri (2013).…”

Section: Discussionsupporting

confidence: 87%

Microbial Communities in Vermiculation Deposits from an Alpine Cave

et al. 2020

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Morgana Cave is located in Val di Scerscen, Central Italian Alps. The cave opens at an altitude of 2,600 m a.s.l. close to the retreating glacier Vedretto di Scerscen, and its entrance was discovered 30 years ago hidden underneath the glacier. A characteristic of this cave is the occurrence of vermiculation deposits on the walls and ceiling. In general, the composition of the microbial communities in cave vermiculations is relatively unknown and rarely investigated. Here we present the data of a geomicrobiological study of vermiculations from an Alpine cave subjected to extreme climate conditions. The microbial communities were dominated by 13 main phyla of Bacteria, and contained a negligible percentage (<1%) of Archaea. The two major bacterial classes were Gammaproteobacteria and Betaproteobacteria, whose metabolic traits were mainly associated with the nitrogen cycle. In addition, psychrophilic and methanotrophic bacterial groups were identified. The occurrence of a large number of uncultured members, at the lowest taxonomic ranks, indicated the presence of still unexplored microbial taxa in the vermiculations.

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Section: Discussionsupporting

confidence: 87%

Microbial Communities in Vermiculation Deposits from an Alpine Cave

et al. 2020

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“…The Hubelj Spring (elevation 220 m; Figure 1) represents an integration of the karst region that drains Paradana Cave and it has d-excess of~2.7 higher than the cave ice ( Table 2). These more enriched d-excesses probably indicate some refreezing of the original precipitation, as noted in several other ice cave studies (e.g., [2,8,26]). The δ 18 O profiles of the vertical ice are different for the two caves.…”

Section: Discussionsupporting

confidence: 69%

“…The data are from wet deposition only and are volume-weighted. We have utilized the mean concentrations over that time period in our discussion, even though for most constituents there has been a downward trend in concentrations over the time period [26]. The other potential source of the excess Ca 2+ and K + in this ice is from the input of "dust" directly into the ice or to the original snow before it was converted to ice.…”

Section: Discussionmentioning

confidence: 99%

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Glaciochemistry of Cave Ice: Paradana and Snežna Caves, Slovenia

et al. 2019

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Cave ice samples collected within karstic terrain have major ion and nutrient concentrations showing that the ice originates from local precipitation modified by the addition of Ca2+ and HCO3− from the dissolution of the local bedrock. Isotopic profiles of Paradana Cave ice are similar to those described in other ice caves in central and eastern Europe, where the profiles are developed through the freezing of cave pool or “lake” waters from the top downward during the onset of the cold portion of the year. Stable isotope data suggest future studies may yield a long-term paleo-environmental record for this location.

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“…To assess the extent of terrestrial export and catchment effects on the distribution of trace elements, contemporary fluxes to the sediment of As, Cr, Hg and Zn in 6J, normalised to the catchment area:lake area ratio, were compared to their average total atmospheric deposition fluxes. Total atmospheric deposition fluxes were assessed for Iskrba pri Kočevski Reki, a remote EMEP site in southern Slovenia (ARSO 2018), meaning that deposition in the Julian Alps could have been even higher because of precipitation that is almost twice as great, and higher elevation, which would change the composition of precipitation (Muri 2013). Nevertheless, normalised contemporary fluxes of As, Hg and Zn to the sediment in 6J were mostly on the order of only 10% of their average total atmospheric deposition fluxes (Table 1), indicating effective retention of these trace elements in the catchment.…”

Section: Discussionmentioning

confidence: 99%

Recent changes in major and trace elements in sediments from a remote mountain lake (6th Triglav Lake) in the Julian Alps, NW Slovenia

et al. 2020

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We collected a sediment core from the 6th (6J) Triglav Lake, a remote mountain lake in NW Slovenia, and analysed it for 25 elements, using k 0instrumental neutron activation analysis (k 0 -INAA). For Hg, we used cold vapour atomic absorption spectrometry (CVAAS). Data were analysed using Principal Component Analysis (PCA). PCA indicated several distinct groups of elements and sediment core samples. Ca distribution was entirely different from all other sediment components. Ba, Br, Hg, Sb and Zn were associated with organic matter (OM), with Hg showing the strongest affinity to OM. As, Cr, Fe and U formed a group of redox-sensitive elements. Two events that occurred ca. 1915 and in the 1940s/1950s, were identified in the core. They were associated with increased inputs of allochthonous material into the lake, and significantly affected the stratigraphic distributions of all elements. Some trace elements, such as As, Hg and Zn, are probably effectively retained in the catchment, whereas Cr tends to be readily exported from the catchment. Atmospheric deposition affected not only elements of anthropogenic origin (As, Ba, Br, Hg, Sb, Zn and Cr) that started to increase after the 1970s, but also those of terrestrial origin (Ca, Fe, Na). Introduction of fish into the lake in 1991 and the subsequent increase in primary production, affected the distribution of Ca and elements that are redoxsensitive and/or associated with OM (As, Ba, Fe, Sb, U, Zn). Fe minerals in uppermost 6J sediments have a strong influence on the distribution of several trace elements. As and Zn closely tracked Fe, whereas Sb was likely released after oxidation. Climate change could also have enhanced inputs of elements from the catchment, but such changes were likely overwhelmed by the effects of increased eutrophication.

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Atmospheric deposition chemistry in a subalpine area of the Julian Alps, North-West Slovenia

Abstract: Wet-only precipitation was collected in Rateče, a remote village in the outskirts of the Julian Alps (Nort-West Slovenia) during 2003-2011, in

Cited by 10 publications

References 25 publications

Microbial Communities in Vermiculation Deposits from an Alpine Cave

Microbial Communities in Vermiculation Deposits from an Alpine Cave

Glaciochemistry of Cave Ice: Paradana and Snežna Caves, Slovenia

Recent changes in major and trace elements in sediments from a remote mountain lake (6th Triglav Lake) in the Julian Alps, NW Slovenia

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