High Resolution Mapping of Tundra Ecosystems on Victoria Island, Nunavut – Application of a Standardized Terrestrial Ecosystem Classification

Ponomarenko, Serguei; McLennan, Donald; Pouliot, Darren; Wagner, Johann

doi:10.1080/07038992.2019.1682980

Cited by 15 publications

(19 citation statements)

References 54 publications

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“…Interestingly, satellite imagery from ERA5 and nearby lakes and ponds suggests some sites have routinely had high Chl a concentrations for decades. This may also be related to the shallowness of the water bodies, since lakes and ponds with a light green colour found close to ERA5 (Figure 3) correspond to depths of less than 2 m reported by Ponomarenko et al (2019). We argue that catchment and lake characteristics make some shallow lakes more susceptible/less resilient to eutrophication that is caused largely by different catchment inputs.…”

Section: Discussionmentioning

confidence: 60%

“…Feces are a source of TP and TN and can trigger cyanobacterial blooms (Jensen et al 2019;Mariash et al 2019), but residence time, dictated by geomorphology would determine the likelihood of a persistent or annual recurring bloom. The area surrounding ERA5 is dominated by moderate slopes on the northern side of the lake and characterized by Dryas integrifolia -Carex rupestris plant associations that can range from 10 to 75% cover (Ponomarenko et al 2019). The southernmost margin of the lake is dominated by two converging slopes and flat areas that are often flooded.…”

Section: Discussionmentioning

confidence: 99%

“…The southernmost margin of the lake is dominated by two converging slopes and flat areas that are often flooded. Carex species are abundant and exposed to high levels of goose grazing and feces deposition, which increases nutrients in the soil and shallow waters (Ponomarenko et al 2019) that are subsequently flushed to lakes, especially with high snowmelt.…”

Section: Discussionmentioning

confidence: 99%

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Evidence of eutrophication in Arctic lakes

et al. 2021

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Lakes and ponds are dominant components of Arctic landscapes and provide food and water for northern communities. In the Greiner Lake watershed, in Cambridge Bay (Nunavut, Canada), water bodies are small (84% < 5 ha) and shallow (99% <4 m). Such characteristics make them vulnerable to eutrophication as temperatures rise and nutrient concentrations from the greening landscape increase. Here, we investigated and compared 35 lakes and ponds in the Greiner watershed in August 2018 and 2019 to determine their current trophic states based on their chemical composition and phytoplankton communities. The ponds had higher trophic status than the lakes, but overall, most sites were oligotrophic. Lake ERA5, located upstream of any direct human influence was classified as eutrophic due to high total phosphorus (32.3 µg L<sup>-1</sup>) and a high proportion of Cyanobacteria (42.9% of total phytoplankton biovolume). Satellite imagery suggests the lake may have been eutrophic for the last 30 years. We hypothesize that the coupled effects of catchment characteristics and elevated local snow accumulation patterns promote higher nutrient leaching rates from the soils. We recommend further analysis and monitoring as eutrophication could become more widespread with ongoing climate change and the associated increases in temperature, precipitation, and catchment-lake coupling.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Evidence of eutrophication in Arctic lakes

et al. 2021

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“…The ecotypes described in Figure 1 were determined using an ecosystem mapping approach (Ponomarenko et al 2019) the 15 classes displayed in Figure 1: 1) sedge/shrub, classes 1,2 and 7; 2) organic soil (rock < 10%), classes 8, 9 and 10; 3) organic soil (rock < 75%), classes 11, 12 and 13; 4) rock > 75%, classes 14 and 15. It should be noted that for the sedge/shrub type, the roughness measurements were not of actual shrubs but rather of the area surrounding small vegetation.…”

Section: Study Sitementioning

confidence: 99%

Improvement of microwave emissivity parameterization of frozen Arctic soils using roughness measurements derived from photogrammetry

Meloche

Royer

Langlois

et al. 2020

International Journal of Digital Earth

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Soil emissivity of Arctic regions is a key parameter for assessing surface properties from microwave brightness temperature (Tb) measurements. Particularly in winter, frozen soil permittivity and roughness are two poorly characterized unknowns that must be considered. Here, we show that after removing snow, the 3D soil roughness can be accurately inferred from in-situ photogrammetry using Structure from Motion (SfM). We focus on using SfM techniques to provide accurate roughness measurements and improve emissivity models parametrization of frozen arctic soil for microwave applications. Validation was performed from ground-based radiometric measurements at 19 and 37 GHz using three different soil emission models: the Wegmüller and Mätzler (1999) model (Weg99), the Wang and Choudhury ( 1981) model (QNH), and a geometrical optics model (Geo Optics). Measured and simulated brightness temperatures over different tundra and rock sites in the Canadian High Arctic show that Weg99, parametrized with SfM-based roughness and optimized permittivity ( , yielded a RMSE of 3.1 K ( ) 𝜀)𝑅 2 = 0.71 for all frequencies and polarizations. Our SfM based approach allowed us to measure roughness with 0.1 mm accuracy at 55 locations of different land cover type using a digital camera and metal plates of know dimensions.

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“…Ecological mapping differs from a number of other thematic (geological, geomorphological, soil) mapping fields with the complexity of determining its subject area. The main object of ecological mapping are ecosystems of different rank, the extent of anthropogenic impact on the environment, nature conservation measures, the relationship of organisms and environment, environmental situations [2,8,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Web-mapping of environmental pollution of the surface waters of the Lviv region

Sohor

Fys

Brydun

et al. 2020

AstSR

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The ecological status of the surface waters of the Lviv region is influenced by closely related various factors, namely: soil pollution, atmosphere, change of landscape structure and technogenic congestion of the territory, inefficient work of sewage and treatment facilities, failure of the mapping of coastal water protection and marsh, as well as their non-observance, especially in settlements, pollution and clogging of rivers with household and other wastes, trellising of forests along streams in mountainous terrain. Another important problem that leads to surface water pollution in the region is the lack of water protection zones and coastal protection strips of water bodies in the territory of the region. Absence of planning and mapping materials and uncertainty on the terrain boundaries of water protection zones and coastal protection strips lead to violations of land and water legislation when using them. At present, the state of water bodies in Ukraine, and in particular in the Lviv region is at an unsatisfactory level. The main problems in this area are the progressive nature of the negative impact on the environmental and human health. As at present there is no cartographic material that can visualize the problem of surface water pollution in Lviv region, the main purpose of this work was to create an interactive map of surface water pollution. To achieve this goal, we collected and systematized geospatial statistical mapping materials on the ecological status of the surface waters of the Lviv region. The necessary software for the development of the interactive map is identified and its possibilities are examined. An algorithm for loading geospatial data into the created web resource has been developed. The application template for the creation of web-maps of the monitoring network of the surface water of the Lviv region and the discharge of sewage for 2017-2018 in ArcGIS Online environment was selected. Thus, two interactive maps of ecological pollution of Lviv region's surface water in ArcGIS Online were developed.

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High Resolution Mapping of Tundra Ecosystems on Victoria Island, Nunavut – Application of a Standardized Terrestrial Ecosystem Classification

Cited by 15 publications

References 54 publications

Evidence of eutrophication in Arctic lakes

Evidence of eutrophication in Arctic lakes

Improvement of microwave emissivity parameterization of frozen Arctic soils using roughness measurements derived from photogrammetry

Web-mapping of environmental pollution of the surface waters of the Lviv region

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