Impact of freeze-thaw cycles on organic carbon and metals in waters of permafrost peatlands

Payandi-Rolland, Dahédrey; Shirokova, Liudmila S.; Labonne, Fabian; Bénézeth, Pascale; Pokrovsky, Oleg S.

doi:10.1016/j.chemosphere.2021.130510

Cited by 21 publications

(21 citation statements)

References 73 publications

(104 reference statements)

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“…Furthermore, it was shown that a high concentration of DOM and low freezing temperatures diminish the proportion of DOM incorporated in the ice phase (Elliott and Henry, 2009;Hentschel et al, 2008;Xue et al, 2015), whereas some parts of ionic solutes and even organic colloids could be occluded (incorporated) in the ice in the form of liquid pockets as is known for sea ice formation During freezing of aqueous organic-rich solutions, organic matter coagulates in the ice due to changes in particle density and diameter (Fellman et al, 2008;Giesy and Briese, 1978). This coagulation is frequently accompanied by formation of organo-metal (Fe, Al) hydroxide aggregates (Pokrovsky et al, 2018;Payandi-Rolland et al, 2021). The latter study demonstrated a reversibility of OM-metal particle precipitation during repetitive freezing and thawing of < 0.45 µm-ltered peat leachates and natural waters from peatland depressions.…”

Section: Discussionmentioning

confidence: 99%

Fractionation of organic C, nutrients, metals and bacteria in peat porewater and ice after freezing and thawing

Morgalev

Lim

Morgaleva

et al. 2022

Environ Sci Pollut Res

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To better understand freezing -thawing cycles operating in peat soils of permafrost landscapes, we experimentally modelled bi-directional freezing and thawing of the three sections of 90-cm long peat core collected from a discontinuous permafrost zone in western Siberia. We measured translocation of microorganisms and changes in porewater chemistry (pH, UV absorbance, dissolved organic carbon (DOC), and major and trace element concentrations) after thawing and two-way freezing of peat cores. We demonstrate that bi-directional freezing and thawing of a peat core is capable of strongly modifying the vertical pattern of bacteria, DOC, nutrients, and trace element concentrations. Sizeable enrichment (a factor of 2 to 5) of DOC, macro-(P, K, Ca) and micro-nutrients (Ni, Mn, Co, Rb, B) and some low-mobile trace elements in several horizons of ice and peat porewater after freeze/thaw experiment may stem from physical disintegration of peat particles, leaching of peat constituents and opening of isolated (nonconnected) pores during freezing front migration. However, due to the appearance of multiple maxima of element concentration after a freeze-thaw event, the use of peat ice chemical composition as environmental archive for paleo-reconstructions is unwarranted.

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Section: Discussionmentioning

confidence: 99%

Fractionation of organic C, nutrients, metals and bacteria in peat porewater and ice after freezing and thawing

Morgalev

Lim

Morgaleva

et al. 2022

Environ Sci Pollut Res

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“…The observed increase in iron and humic substances concentrations in Arctic–boreal river waters has been attributed to permafrost thaw and an increase in groundwater contribution to river flows . E.g., it was recently shown that the enhanced frequency of freeze–thaw cycles promotes the release of iron and SAHLs from permafrost peat soils . In addition, higher summer temperatures lead to higher phenol oxidase activity in the top layers of peat soils and an associated increase in humic substances release from the soil matrix …”

Section: Discussionmentioning

confidence: 99%

“…154 E.g., it was recently shown that the enhanced frequency of freeze−thaw cycles promotes the release of iron and SAHLs from permafrost peat soils. 162 In addition, higher summer temperatures lead to higher phenol oxidase activity in the top layers of peat soils and an associated increase in humic substances release from the soil matrix. 52 The Northern land sink (forested and unforested peatlands and mires) is the most important current land sink for anthropogenic CO 2 .…”

Section: ■ Conclusionmentioning

confidence: 99%

Northern High-Latitude Organic Soils As a Vital Source of River-Borne Dissolved Iron to the Ocean

Krachler

2021

Environ. Sci. Technol.

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Organic soils in the Arctic−boreal region produce small aquatic humic ligands (SAHLs), a category of naturally occurring complexing agents for iron. Every year, large amounts of SAHLsloaded with iron mobilized in river basinsreach the oceans via river runoff. Recent studies have shown that a fraction of SAHLs belong to the group of strong iron-binding ligands in the ocean. That means, their Fe(III) complexes withstand dissociation even under the conditions of extremely high dilution in the open ocean. Fe(III)-loaded SAHLs are prone to UV-photoinduced ligand-to-metal charge-transfer which leads to disintegration of the complex and, as a consequence, to enhanced concentrations of bioavailable dissolved Fe(II) in sunlit upper water layers. On the other hand, in water depths below the penetration depth of UV, the Fe(III)-loaded SAHLs are fairly resistant to degradation which makes them ideally suited as long-lived molecular transport vehicles for river-derived iron in ocean currents. At locations where SAHLs are present in excess, they can bind to iron originating from various sources. For example, SAHLs were proposed to contribute substantially to the stabilization of hydrothermal iron in deep North Atlantic waters. Recent discoveries have shown that SAHLs, supplied by the Arctic Great Rivers, greatly improve dissolved iron concentrations in the Arctic Ocean and the North Atlantic Ocean. In these regions, SAHLs play a critical role in relieving iron limitation of phytoplankton, thereby supporting the oceanic sink for anthropogenic CO 2 . The present Critical Review describes the most recent findings and highlights future research directions.

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“…The seasonal deformation amplitude (SDA) can indicate the soil water content of the AL [8] and directly affects the engineering construction stability in the cold region [9][10][11][12]. The timing of the F-T cycle also determines the growing season of vegetation [13,14], affects the energy exchange between land and atmosphere [7,15], and changes the carbon release in permafrost [16,17].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Freeze–Thaw Cycles in an Endorheic Basin on the Qinghai-Tibet Plateau Based on SBAS-InSAR Technology

et al. 2022

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The freeze–thaw (F-T) cycle of the active layer (AL) causes the “frost heave and thaw settlement” deformation of the terrain surface. Accurately identifying its amplitude and time characteristics is important for climate, hydrology, and ecology research in permafrost regions. We used Sentinel-1 SAR data and small baseline subset-interferometric synthetic aperture radar (SBAS-InSAR) technology to obtain the characteristics of F-T cycles in the Zonag Lake-Yanhu Lake permafrost-affected endorheic basin on the Qinghai-Tibet Plateau from 2017 to 2019. The results show that the seasonal deformation amplitude (SDA) in the study area mainly ranges from 0 to 60 mm, with an average value of 19 mm. The date of maximum frost heave (MFH) occurred between November 27th and March 21st of the following year, averaged in date of the year (DOY) 37. The maximum thaw settlement (MTS) occurred between July 25th and September 21st, averaged in DOY 225. The thawing duration is the thawing process lasting about 193 days. The spatial distribution differences in SDA, the date of MFH, and the date of MTS are relatively significant, but there is no apparent spatial difference in thawing duration. Although the SDA in the study area is mainly affected by the thermal state of permafrost, it still has the most apparent relationship with vegetation cover, the soil water content in AL, and active layer thickness. SDA has an apparent negative and positive correlation with the date of MFH and the date of MTS. In addition, due to the influence of soil texture and seasonal rivers, the seasonal deformation characteristics of the alluvial-diluvial area are different from those of the surrounding areas. This study provides a method for analyzing the F-T cycle of the AL using multi-temporal InSAR technology.

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Impact of freeze-thaw cycles on organic carbon and metals in waters of permafrost peatlands

Cited by 21 publications

References 73 publications

Fractionation of organic C, nutrients, metals and bacteria in peat porewater and ice after freezing and thawing

Fractionation of organic C, nutrients, metals and bacteria in peat porewater and ice after freezing and thawing

Northern High-Latitude Organic Soils As a Vital Source of River-Borne Dissolved Iron to the Ocean

Characteristics of Freeze–Thaw Cycles in an Endorheic Basin on the Qinghai-Tibet Plateau Based on SBAS-InSAR Technology

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