The impacts of permafrost thaw slump events on limnological variables in upland tundra lakes, Mackenzie Delta region

Houben, Adam J.; French, Todd D.; Kokelj, Steven V.; Wang, Xiaowa; Smol, John P.; Blais, Jules M.

doi:10.1127/fal/2016/0921

Cited by 27 publications

(39 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The water-quality measurements for the twenty-one lakes in our study generally conformed well with previous studies in the region. The pH of lakes in this region was found to range between 6.9-7.6 in previous studies (Swadling, Pienitz, and Nogrady 2000;Kokelj, Zajdlik, and Thompson 2009;Houben et al 2016), which falls into the range for our twenty-one lakes (6.1-8.5). Total organic carbon levels measured in thirty-nine lakes by Kokelj, Zajdlik, and Thompson (2009) averaged 16.1 mg/L, falling between our recorded concentrations for natural and gravel-pit lakes, which had mean TOC concentrations of 22.2 and 15.3 mg/L, respectively.…”

Section: Morphometry and Water Qualitysupporting

confidence: 62%

Young gravel-pit lakes along Canada’s Dempster Highway: How do they compare with natural lakes?

Vucic

Cohen

Gray

et al. 2019

Arctic, Antarctic, and Alpine Research

View full text Add to dashboard Cite

Gravel-pit lakes are a common feature of many human-modified landscapes throughout the world. In Canada's north, they are often formed when gravel is extracted to construct dams, bridges, and highways. Past studies suggest that gravel-pit lakes differ from natural lakes in terms of their morphometry, water quality, and biological communities. In this study, we compared gravel-pit and natural lakes by sampling lakes between Inuvik and Fort McPherson in the Northwest Territories. We collected lake morphometry, water quality, and biological data (zooplankton, macroinvertebrates, and fish presence) from six gravel-pit lakes and fifteen natural lakes. In comparison to natural lakes, gravelpit lakes were four times deeper, two times clearer, and five times smaller in their surface area. In addition, important nutrients, including phosphorus and nitrogen, were significantly lower in gravelpit lakes. Despite the differences in morphometry and nutrients, pelagic zooplankton and littoral macroinvertebrate communities did not differ significantly between the two lake types. Therefore, we conclude that despite their recent formation and unnatural morphometry, gravel-pit lakes along the Dempster Highway can support invertebrate communities typical of natural lakes in the region.

show abstract

Section: Morphometry and Water Qualitysupporting

confidence: 62%

Young gravel-pit lakes along Canada’s Dempster Highway: How do they compare with natural lakes?

Vucic

Cohen

Gray

et al. 2019

Arctic, Antarctic, and Alpine Research

View full text Add to dashboard Cite

show abstract

“…), promotes flocculation and precipitation of DOC (Houben et al. ), which lowers lake DOC concentrations. Inland waters C cycle studies that capture the diversity of inland waters settings and characteristics are necessary to predict the impact of climate change on lake C chemistry and fluxes in the future.…”

Section: Discussionmentioning

confidence: 99%

Inland waters and their role in the carbon cycle of Alaska

Stackpoole

Butman

Clow

et al. 2017

Ecological Applications

View full text Add to dashboard Cite

Abstract. The magnitude of Alaska (AK) inland waters carbon (C) fluxes is likely to change in the future due to amplified climate warming impacts on the hydrology and biogeochemical processes in high latitude regions. Although current estimates of major aquatic C fluxes represent an essential baseline against which future change can be compared, a comprehensive assessment for AK has not yet been completed. To address this gap, we combined available data sets and applied consistent methodologies to estimate river lateral C export to the coast, river and lake carbon dioxide (CO 2 ) and methane (CH 4 ) emissions, and C burial in lakes for the six major hydrologic regions in the state. Estimated total aquatic C flux for AK was 41 Tg C/yr. Major components of this total flux, in Tg C/yr, were 18 for river lateral export, 17 for river CO 2 emissions, and 8 for lake CO 2 emissions. Lake C burial offset these fluxes by 2 Tg C/yr. River and lake CH 4 emissions were 0.03 and 0.10 Tg C/yr, respectively. The Southeast and South central regions had the highest temperature, precipitation, terrestrial net primary productivity (NPP), and C yields (fluxes normalized to land area) were 77 and 42 g CÁm À2 Áyr À1 , respectively. Lake CO 2 emissions represented over half of the total aquatic flux from the Southwest (37 g CÁm À2 Áyr À1 ). The North Slope, Northwest, and Yukon regions had lesser yields (11, 15, and 17 g CÁm 2 Áyr À1 ), but these estimates may be the most vulnerable to future climate change, because of the heightened sensitivity of arctic and boreal ecosystems to intensified warming. Total aquatic C yield for AK was 27 g CÁm À2 Áyr À1 , which represented 16% of the estimated terrestrial NPP. Freshwater ecosystems represent a significant conduit for C loss, and a more comprehensive view of land-water-atmosphere interactions is necessary to predict future climate change impacts on the Alaskan ecosystem C balance.

show abstract

“…Moreover, their headwalls have retreated extensively over the past decades [Lantuit and Pollard, 2005;Lewkowicz, 1987a]. These disturbances have a considerable impact on the surrounding ecosystems, strongly affecting terrestrial [Tanski et al, 2016;Cray and Pollard, 2015;Cannone et al, 2010;Lantz et al, 2009;Lantz and Kokelj, 2008] and aquatic ecosystems [Chin et al, 2016;Houben et al, 2016;Chipman et al, 2016; by reworking sediments and mobilizing carbon, nitrogen, and nutrients.…”

Section: Introductionmentioning

confidence: 99%

Terrain controls on the occurrence of coastal retrogressive thaw slumps along the Yukon Coast, Canada

et al. 2017

View full text Add to dashboard Cite

Retrogressive thaw slumps (RTSs) are among the most active landforms in the Arctic; their number has increased significantly over the past decades. While processes initiating discrete RTSs are well identified, the major terrain controls on the development of coastal RTSs at a regional scale are not yet defined. Our research reveals the main geomorphic factors that determine the development of RTSs along a 238 km segment of the Yukon Coast, Canada. We (1) show the current extent of RTSs, (2) ascertain the factors controlling their activity and initiation, and (3) explain the spatial differences in the density and areal coverage of RTSs. We mapped and classified 287 RTSs using high‐resolution satellite images acquired in 2011. We highlighted the main terrain controls over their development using univariate regression trees model. Coastal geomorphology influenced both the activity and initiation of RTSs: active RTSs and RTSs initiated after 1972 occurred primarily on terrains with slope angles greater than 3.9° and 5.9°, respectively. The density and areal coverage of RTSs were constrained by the volume and thickness of massive ice bodies. Differences in rates of coastal change along the coast did not affect the model. We infer that rates of coastal change averaged over a 39 year period are unable to reflect the complex relationship between RTSs and coastline dynamics. We emphasize the need for large‐scale studies of RTSs to evaluate their impact on the ecosystem and to measure their contribution to the global carbon budget.

show abstract

The impacts of permafrost thaw slump events on limnological variables in upland tundra lakes, Mackenzie Delta region

Cited by 27 publications

References 0 publications

Young gravel-pit lakes along Canada’s Dempster Highway: How do they compare with natural lakes?

Young gravel-pit lakes along Canada’s Dempster Highway: How do they compare with natural lakes?

Inland waters and their role in the carbon cycle of Alaska

Terrain controls on the occurrence of coastal retrogressive thaw slumps along the Yukon Coast, Canada

Contact Info

Product

Resources

About