Time-lapse electrical resistivity tomography and ground penetrating radar mapping of the active layer of permafrost across a snow fence in Cambridge Bay, Nunavut Territory, Canada: correlation interpretation using vegetation and meteorological data

Kim, Kwansoo; Lee, Joohan; Ju, Hyeontae; Jung, Jae Chang; Chae, Namyi; Chi, Junhwa; Kwon, Mi Hye; Lee, Bang Yong; Wagner, Johann; Kim, Ji-Soo

doi:10.1007/s12303-021-0021-7

Cited by 10 publications

(7 citation statements)

References 25 publications

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“…As TN content greatly exceeded TP content, P limitation of autotrophic growth was likely, as evidenced in the high N:P ratios at all sites, particularly in headwater lakes. The shallow organic horizon (<10 cm) present in the Cambridge Bay area (Kim et al., 2021), in addition to the predominantly limestone bedrock (McLennan et al., 2018), rarely allows higher contents of P to leach from the bedrock as would happen in more organic‐rich soils (Hobbie et al., 1999). An earlier study of headwater lake ERA5 provided evidence of P limitation and showed high TP concentrations facilitated an increase in cyanobacterial biovolume (Ayala‐Borda et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

Dominance of net autotrophy in arid landscape low relief polar lakes, Nunavut, Canada

Ayala‐Borda,

Bogard,

Grosbois

et al. 2024

Global Change Biology

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The Arctic is the fastest warming biome on the planet, and environmental changes are having striking effects on freshwater ecosystems that may impact the regional carbon cycle. The metabolic state of Arctic lakes is often considered net heterotrophic, due to an assumed supply of allochthonous organic matter that supports ecosystem respiration and carbon mineralization in excess of rates of primary production. However, lake metabolic patterns vary according to regional climatic characteristics, hydrological connectivity, organic matter sources and intrinsic lake properties, and the metabolism of most Arctic lakes is unknown. We sampled 35 waterbodies along a connectivity gradient from headwater to downstream lakes, on southern Victoria Island, Nunavut, in an area characterized by low precipitation, organic‐poor soils, and high evaporation rates. We evaluated whether lakes were net autotrophic or heterotrophic during the open water period using an oxygen isotopic mass balance approach. Most of the waterbodies were autotrophic and sites of net organic matter production or close to metabolic equilibrium. Autotrophy was associated with higher benthic primary production, as compared to its pelagic counterpart, due to the high irradiance reaching the bottom and efficient internal carbon and nutrient cycling. Highly connected midstream and downstream lakes showed efficient organic matter cycling, as evidenced by the strong coupling between gross primary production (GPP) and ecosystem respiration, while decoupling was observed in some headwater lakes with significantly higher GPP. The shallow nature of lakes in the flat, arid region of southern Victoria Island supports net autotrophy in most lakes during the open water season. Ongoing climate changes that lengthen the ice‐free irradiance period and increase rates of nutrient evapoconcentration may further promote net autotrophy, with uncertain long‐term effects for lake functioning.

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Section: Discussionmentioning

confidence: 99%

Dominance of net autotrophy in arid landscape low relief polar lakes, Nunavut, Canada

Ayala‐Borda,

Bogard,

Grosbois

et al. 2024

Global Change Biology

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“…Snow was large in Northeast China, and the ACD SCD between the 1960s and 2010s in permafrost regions reached more than 8.16 cm. Snow cover is the main controlling factor of permafrost temperature [77,78]. Snow cover has the function of heat insulation and preservation, which can prevent or reduce heat loss from the ground, thus changing the rate and amount of heat exchange between the ground and the atmosphere [18,49,[79][80][81].…”

Section: Effects Of Aasd and Scd The Xing'an Permafrostmentioning

confidence: 99%

Influences of Snow Cover on the Thermal Regimes of Xing'an Permafrost in Northeast China in 1960s–2010s

Wang,

Jin,

Che

et al. 2024

Permafrost & Periglacial

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The distributive characteristics of snow cover and their impacting mechanisms on ground thermal regimes in Northeast China remain evasive because of limited systematic studies. In this study, based on long‐term ground‐based observational data and auxiliary topographic data, geographically weighted regression kriging (GWRK) method and the temperature at the top of permafrost (TTOP) model were used to analyze the influences of snow cover duration (SCD) and average snow depth over the SCD (ASDSCD) on the thermal regimes of Xing'an permafrost in Northeast China in the 1960s–2010s. The results show a remarkable reduction of permafrost extent in Northeast China from the 1960s to 2010s, with an average reduction rate of 4.115 × 104 km2/decade. In permafrost regions, from the 1960s to 2010s, average SCD varied between 150 and 160 days, and the regional average of ASDSCD between 8 and 14 cm. Increases in ASDSCD led to a rise of TTOP. From the 1960s to 2010s, the regional average of ASDSCD increased by 3.53 cm, and that of TTOP by 2.02°C. The research results can provide scientific basis and data support for evaluating the responses of permafrost and cold region ecosystems to climate change in Northeast China.

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“…Typically, this involves the GPR technique as Considering that the geophysical response of complex geological bodies exhibits different physical properties due to the fact that such horizons are composed of a combination of layers with contrasting properties and are caused by a host of geological, geotechnical, and climatic factors, a multidisciplinary approach is often recommended to gather an in-depth understanding of the features. Typically, this involves the GPR technique as the primary method to determine the velocity and geometrical attributes of the subsur-face, while electrical resistivity tomography and seismic reflection and refraction often work as complementary methods [302][303][304][305][306][307][308][309], due to their limited resolutions and mediocre stratum-detection performance, in particular for the shallow subsurface.…”

Section: Gpr Applications In Geologymentioning

confidence: 99%

From Its Core to the Niche: Insights from GPR Applications

2022

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Thanks to its non-destructive, high-resolution imaging possibilities and its sensitivity to both conductive and dielectric subsurface structures, Ground-Penetrating Radar (GPR) has become a widely recognized near-surface geophysical tool, routinely adopted in a wide variety of disciplines. Since its first development almost 100 years ago, the domain in which the methodology has been successfully deployed has significantly expanded from ice sounding and environmental studies to precision agriculture and infrastructure monitoring. While such expansion has been clearly supported by the evolution of technology and electronics, the operating principles have always secured GPR a predominant position among alternative inspection approaches. The aim of this contribution is to provide a large-scale survey of the current areas where GPR has emerged as a valuable prospection methodology, highlighting the reasons for such prominence and, at the same time, to suggest where and how it could be enhanced even more.

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Time-lapse electrical resistivity tomography and ground penetrating radar mapping of the active layer of permafrost across a snow fence in Cambridge Bay, Nunavut Territory, Canada: correlation interpretation using vegetation and meteorological data

Cited by 10 publications

References 25 publications

Dominance of net autotrophy in arid landscape low relief polar lakes, Nunavut, Canada

Dominance of net autotrophy in arid landscape low relief polar lakes, Nunavut, Canada

Influences of Snow Cover on the Thermal Regimes of Xing'an Permafrost in Northeast China in 1960s–2010s

From Its Core to the Niche: Insights from GPR Applications

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