Thermokarst dynamics in Western Siberia: insights from dendrochronological research

Агафонов, Л. И.; Strunk, Horst; Nuber, T.

doi:10.1016/j.palaeo.2004.02.024

Cited by 36 publications

(23 citation statements)

References 14 publications

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“…Such changes may already be occurring in western Siberia. Agafonov et al (2004) suggested that expansion of thermokarst lakes during the past 50 years is largely a result of increasing precipitation.…”

Section: Based Onmentioning

confidence: 99%

“…Numerous shallow thermokarst or 'thaw' lakes develop as a result of rapid permafrost degradation throughout the Arctic and subarctic regions of northern North America (Allard and Séguin, 1987;Payette et al, 2004;Bouchard et al, 2013) and Eurasia (Agafonov et al, 2004). The prerequisite for their formation is the presence and thaw of ground ice.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Landscape-gradient assessment of thermokarst lake hydrology using water isotope tracers

Narancic

Wolfe

Pienitz

et al. 2017

Journal of Hydrology

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Please cite this article as: Narancic, B., Wolfe, B.B., Pienitz, R., Meyer, H., Lamhonwah, D., Landscape-gradient assessment of thermokarst lake hydrology using water isotope tracers, Journal of Hydrology (2016), doi: http:// dx.doi.org/10. 1016/j.jhydrol.2016.11.028 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.1 Landscape-gradient assessment of thermokarst lake hydrology using water isotope -Water isotopes are used to characterize thermokarst lake hydrology in Nunavik, Canada.-Rainfall and/or permafrost meltwater are the main lake water sources.-Maritime climate enhances the hydrological resiliency of thermokarst lakes.-Terrestrial carbon inputs from surface runoff are likely to increase in the future.-Thermokarst lakes will persist and methane emissions are likely to increase.3 ABSTRACT Thermokarst lakes are widespread in arctic and subarctic regions. In subarctic Québec (Nunavik), they have grown in number and size since the mid-20 th century.Recent studies have identified that these lakes are important sources of greenhouse gases. This is mainly due to the supply of catchment-derived dissolved organic carbon that generates anoxic conditions leading to methane production. To assess the potential role of climate-driven changes in hydrological processes to influence greenhouse-gas emissions, we utilized water isotope tracers to characterize the water balance of thermokarst lakes in Nunavik during three consecutive mid-to late summer seasons (2012)(2013)(2014). Lake distribution stretches from shrub-tundra overlying discontinuous permafrost in the north to spruce-lichen woodland with sporadic permafrost in the south.Calculation of lake-specific input water isotope compositions ( I ) and lake-specific evaporation-to-inflow (E/I) ratios based on an isotope-mass balance model reveal a narrow hydrological gradient regardless of diversity in regional landscape characteristics. Nearly all lakes sampled were predominantly fed by rainfall and/or permafrost meltwater, which suppressed the effects of evaporative loss. Only a few lakes in one of the southern sampling locations, which overly highly degraded sporadic permafrost terrain, appear to be susceptible to evaporative lake-level drawdown. We attribute this lake hydrological resiliency to the strong maritime climate in coastal regions of Nunavik. Predicted climate-driven increases in precipitation and permafrost degradation will likely contribute to persistence and expansion of thermokarst lakes throughout the region. If coupled with an increase in terrestrial carbon inputs to thermokarst lakes from surface runoff, conditions favorable for mineralizatio...

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Section: Based Onmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Landscape-gradient assessment of thermokarst lake hydrology using water isotope tracers

Narancic

Wolfe

Pienitz

et al. 2017

Journal of Hydrology

View full text Add to dashboard Cite

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“…They are rather shallow (1-3 m) and are characterized by specific thermal and chemical regimes, making them sensitive to recent climate changes [26].…”

Section: Methodsmentioning

confidence: 99%

Chironomids (Diptera: Chironomidae) in lakes of central Yakutia and their indicative potential for paleoclimatic research

Nazarova

Pestryakova

Ushnitskaya

et al. 2008

Contemp. Probl. Ecol.

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Abstract-A study of chironomid fauna was carried out in two regions of central Yakutia. Fossilized remnants of head capsules were sampled from shallow layers of the bottom sediments of lakes. Seventy five taxa of chironomids have been determined. Statistical analysis shows that the spatial distribution of chironomid taxa in the study regions is mainly controlled by ions of aluminium and magnesium, mean July temperature, transparency and content of oxygen in water. The obtained results serve as the base for development of a chironomid temperature model used for reconstruction of Holocene and Pleistocene paleotemperatures of the Russian North.

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“…Similarly, only limited dendrogeomorphological data exist on the rise and evolution of thermokarst. Agafonov et al (2004), for instance, report that the development of thermokarst over the last 50 years depended primarily on increasing precipitation rather than increasing air temperature. Movements in rockglacier bodies have, in contrast been documented in several case-studies.…”

Section: What Natural Hazards Processes Are Analyzed With Tree Rings?mentioning

confidence: 99%

Tree-ring analysis in natural hazards research – an overview

Stoffel

Bollschweiler

2008

Nat. Hazards Earth Syst. Sci.

391

207

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Abstract. The understanding of geomorphic processes and knowledge of past events are important tasks for the assessment of natural hazards. Tree rings have on varied occasions proved to be a reliable tool for the acquisition of data on past events. In this review paper, we provide an overview on the use of tree rings in natural hazards research, starting with a description of the different types of disturbances by geomorphic processes and the resulting growth reactions. Thereafter, a summary is presented on the different methods commonly used for the analysis and interpretation of reactions in affected trees. We illustrate selected results from dendrogeomorphological investigations of geomorphic processes with an emphasis on fluvial (e.g., flooding, debris flows) and mass-movement processes (e.g., landslides, snow avalanche), where lots of data have been generated over the past few decades. We also present results from rockfall and permafrost studies, where data are much scarcer, albeit data from tree-ring studies have proved to be of great value in these fields as well.Most studies using tree rings have focused on alpine environments in Europe and North America, whereas other parts of the world have been widely neglected by dendrogeomorphologists so far. We therefore challenge researchers to focus on other regions with distinct climates as well, to look on less frequently studied processes as well and to broaden and improve approaches and methods commonly used in tree-ring research so as to allow a better understanding of geomorphic processes, natural hazards and risk.

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Thermokarst dynamics in Western Siberia: insights from dendrochronological research

Cited by 36 publications

References 14 publications

Landscape-gradient assessment of thermokarst lake hydrology using water isotope tracers

Landscape-gradient assessment of thermokarst lake hydrology using water isotope tracers

Chironomids (Diptera: Chironomidae) in lakes of central Yakutia and their indicative potential for paleoclimatic research

Tree-ring analysis in natural hazards research – an overview

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