Differential Incorporation of Bacteria, Organic Matter, and Inorganic Ions Into Lake Ice During Ice Formation

Santibáñez, Pamela A.; Michaud, Alexander B.; Vick‐Majors, Trista J.; D’Andrilli, Juliana; Chiuchiolo, Amy; Hand, K. P.; Priscu, John C.

doi:10.1029/2018jg004825

Cited by 34 publications

(39 citation statements)

References 65 publications

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“…Lake ice in general and that on large lakes in particular is a factor in the development of littoral geomorphology and plant and wildlife species (Bryan and Marcus 1972;Cox 1984). Indeed, ice and its cover may be a significant factor in the development of lacustrine biotopes and biocenoses (Greenbank 1945;Fang and Stefan 1998;McCord et al 2000;Shuter et al 2012;Santibáñez et al 2019;Wüest et al 2019). Ice phenology and changes to the lake ice regimen also influence local communities living near lakes throughout the temperate zone (Knoll et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Conditions of spatiotemporal variability of the thickness of the ice cover on lakes in the Tatra Mountains

Solarski

Szumny

2020

J. Mt. Sci.

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This research aimed to identify the impact of local climatic and topographic conditions on the formation and development of the ice cover in high-mountain lakes and the representativeness assessment of periodic point measurements of the ice cover thickness by taking into consideration the role of the avalanches on the icing of the lakes. Field works included measurement of the ice and snow cover thickness of seven lakes situated in the Tatra Mountains (UNESCO biosphere reserve) at the beginning and the end of the 2017/2018 winter season. In addition, morphometric, topographic and daily meteorological data of lakes from local IMGW (Polish Institute of Meteorology and Water Management) stations and satellite images were used. The obtained results enabled us to quantify the impact of the winter eolian snow accumulation on the variation in ice thickness. This variation was ranging from several centimetres up to about 2 meters and had a tendency to increase during the winter season. The thickest ice covers occurred in the most shaded places in the direct vicinity of rock walls. The obtained results confirm a dominating role of the snow cover in the variation of the ice thickness within individual lakes.

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Section: Introductionmentioning

confidence: 99%

Conditions of spatiotemporal variability of the thickness of the ice cover on lakes in the Tatra Mountains

Solarski

Szumny

2020

J. Mt. Sci.

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“…The effective segregation coefficient (Keff) during freezing varies between solutes as it is dependent on solubility, molecular symmetry and the structure of the crystal lattice 29 . A recent study of lake ice formation calculated from their freezing experiments that the segregation coefficient is similar for Ca-Na-Cl (Keff: 0.133-0.177), however, it is much higher for SO 4 (Keff: 0.299 ± 0.025) indicating that more SO 4 is incorporated in the ice 30 . If we first correct the solute concentration for ionic segregation during freezing using the Keff for respective solutes, the effect of solute enrichment by cryo-concentration can then be removed by normalizing the solutes to Cl − , a conservative tracer.…”

Section: Resultsmentioning

confidence: 99%

Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica

Marsh

Lacelle

Faucher

et al. 2020

Sci Rep

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perennially ice-covered lakes that host benthic microbial ecosystems are present in many regions of Antarctica. Lake Untersee is an ultra-oligotrophic lake that is substantially different from any other lakes on the continent as it does not develop a seasonal moat and therefore shares similarities to sub-glacial lakes where they are sealed to the atmosphere. Here, we determine the source of major solutes and carbon to Lake Untersee, evaluate the carbon cycling and assess the metabolic functioning of microbial mats using an isotope geochemistry approach. The findings suggest that the glacial meltwater recharging the closed-basin and well-sealed Lake Untersee largely determines the major solute chemistry of the oxic water column with plagioclase and alumino-silicate weathering contributing < 5% of the Ca 2+-na + solutes to the lake. the tic concentration in the lake is very low and is sourced from melting of glacial ice and direct release of occluded co 2 gases into the water column. The comparison of δ 13 c tic of the oxic lake waters with the δ 13 c in the top microbial mat layer show no fractionation due to non-discriminating photosynthetic fixation of HCO 3 in the high pH and carbon-starved water. the 14 C results indicate that phototrophs are also fixing respired CO 2 from heterotrophic metabolism of the underlying microbial mats layers. The findings provide insights into the development of collaboration in carbon partitioning within the microbial mats to support their growth in a carbon-starved ecosystem. Numerous perennially ice-covered lakes have been inventoried in Antarctica, including in the McMurdo Dry Valleys (MDV), Bunger Hills, Vestfold Hills, Schirmacher Oasis, and Soya Coast 1,2. These lakes have varied chemistries as a result of source water and Holocene history of the lakes, but many are oligotrophic and support benthic cyanobacterial mats and heterotrophic bacterial communities 3-5. Primary productivity is often limited by light attenuation through the ice-cover and nutrient availability (e.g., C and P), however, summer moating and streams provide seasonal recharge of nutrients to the lakes 4,6. Analysis of carbon isotopes (e.g., δ 13 C, 14 C) can provide insights about the source of carbon and transformations of organic matter as photosynthesis and remineralization control the isotopic composition of most organic matter. For example, carbon isotope geochemistry of dissolved inorganic carbon (δ 13 C DIC) and organic carbon (δ 13 C DOC) have been used to trace carbon sources and cycling in the MDV lake ecosystem 3,7-9. Lake Untersee is a 169-m deep ultra-oligotrophic lake that is substantially different from other lakes in Antarctica 10,11. It is recharged by subaqueous melting of glacial ice and subglacial meltwater, and the lake remains ice-covered with no open water along the margin (summer moating) that would provide access to nutrients, CO 2 and enhanced sunlight 12-14. In the absence of large metazoans, photosynthetic microbial mats cover the floor of the lake from just below the ice cover ...

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“…In the ice itself, 28% of the samples showed methane oxidation capability. During ice formation most free-living bacteria are lost from the liquid phase through incorporation into the ice, while bacterial aggregates remain in the water (Santibáñez et al, 2019). In an experimental setup, (Wilson et al, 2012) show that multiple freeze-thaw cycles in water from freshwater lakes reduce the total bacterial cell number at least 100,000-fold.…”

Section: Ice Coresmentioning

confidence: 99%

Seasonal methane dynamics in three different Siberian water bodies

Bussmann

Fedorova

Juhls

et al. 2020

Preprint

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Abstract. Arctic regions and their water bodies are being affected by the most rapid climate warming on Earth. Arctic lakes and small ponds are known to act as an important source of atmospheric methane. However, not much is known about other types of water bodies in permafrost regions, which include major rivers and coastal bays as a transition type between freshwater and marine environments. We monitored dissolved methane concentrations in three different water bodies (Lena River, Tiksi Bay and Lake Golzovoye, Siberia, Russia) over a period of two years. Sampling was carried out under ice cover (April) and in open water (July/August). The methane oxidation (MOX) rate in water and melted ice samples from the late winter of 2017 was also investigated. In the Lena River winter methane concentrations were a quarter of the summer concentrations (8 vs 31 nmol L−1) and mean winter MOX rate was low (0.023 nmol L−1 d−1). In contrast, Tiksi Bay winter methane concentrations were 10-times higher than in summer (103 vs 13 nmol L−1). Winter MOX rates showed a median of 0.305 nmol L−1 d−1. In Lake Golzovoye, median methane concentrations in winter were 40-times higher than in summer (1957 vs 49 nmol L−1). However, MOX was much higher in the lake (2.95 nmol L−1 d−1) than in either the river or bay. The temperature had a strong influence on the MOX, (Q10 = 2.72 ± 0.69) compared to temperate environments. In the ice cores a median methane concentration of 9 nM was observed, with no gradient between the ice surface and the bottom layer at the ice-water-interface. MOX in the (melted) ice cores was mostly below the detection limit. Comparing methane concentrations in the ice with the underlaying water column revealed 100 – 1000-times higher methane concentration in the water column. The winter situation seemed to favor a methane accumulation under ice, especially in the lake with a stagnant water body. While on the other hand, in the Lena River with its flowing water no methane accumulation under ice was observed. Methane oxidation rate was not able to counteract this winter time accumulation.

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Differential Incorporation of Bacteria, Organic Matter, and Inorganic Ions Into Lake Ice During Ice Formation

Cited by 34 publications

References 65 publications

Conditions of spatiotemporal variability of the thickness of the ice cover on lakes in the Tatra Mountains

Conditions of spatiotemporal variability of the thickness of the ice cover on lakes in the Tatra Mountains

Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica

Seasonal methane dynamics in three different Siberian water bodies

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