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Dataset results
11 results for “lake stratification”
Modeling the effects of lake morphology on chloride retention and salt-driven stratification in two urban lakes in St. Paul, MN
Road salt inputs have caused widespread salinization of urban lakes in northern temperate regions. Watershed characteristics are known to be important drivers of lake chloride concentrations, but there has been less focus on how lake morphometry influences seasonal and interannual dynamics in lake chloride, and how these chloride levels may alter mixing in the water column. We analyzed chloride retention for two urban lakes (Como Lake and Lake McCarrons) in Saint Paul, Minnesota, that are in adjacent watersheds and have similar surface areas, but differ in depth and water residence time. Summer chloride concentrations were negatively related to total summer precipitation for Como Lake (maximum depth 2.2 m), but the relationship was less strong for Lake McCarrons (maximum depth 7.6 m). We used a zero-dimensional model to simulate chloride dynamics in both lakes and tracked the fate of chloride over time. In Como Lake, the mass of chloride in the lake turns over within three years, whereas chloride inputs are retained for >10 years in Lake McCarrons. We then used a one-dimensional hydrodynamic lake model (GLM-AED) to examine how lake depth affects how current chloride loading rates alter lake mixing. Salt inputs significantly extended the duration of summer stratification for simulated lakes with depths of 8 m or more, and salt inputs increased the number of days of hypoxia and anoxia across all depths. These results underscore the importance of considering lake morphometry in understanding the effects of salt inputs on lake ecosystems.
phenology data of lake mixing, and stratification based on the CESM2-LE output
<p>The phenology data of lake mixing, and stratification calculated from the daily output of CESM2 large ensemble. For more information about this dataset, please refer to the manuscript entitled 'Projected changes in the phenology of stratification and overturning in ice-covered lakes of the Northern Hemisphere (Lei Huang et al)'. For more information about CESM2 large ensemble, please refer to https://www.cesm.ucar.edu/community-projects/lens2. </p>
Dataset: Impact of salinization on lake stratification and spring mixing v1.0 L&O Letters
<p>Scripts, model configurations and outputs to process the data and recreate the figures from Ladwig, R., Rock, L.A, Dugan, H.A. (-): Impact of salinization on lake stratification and spring mixing. This repository includes the setup and output from the lake model ensemble (GLM, GOTM, Simstrat) ran on the lakes Mendota and Monona. Scripts to run the models are located under /numerical and the scripts to process the results for the discussion of the paper are in the top main repository. The scripts to derive the theoretical solution are located under /analytical. Buoy monitoring data are located under /fieldmonitoring. The final figures are located under /figs_HD.</p>
Thermal stratification and fish thermal preference explain vertical eDNA distributions in lakes
<p>Significant advances have been made towards surveying animal and plant communities using DNA isolated from environmental samples. Despite rapid progress, we lack a comprehensive understanding of the "ecology" of environmental DNA (eDNA), particularly its temporal and spatial distribution and how this is shaped by abiotic and biotic processes. Here, we tested how seasonal variation in thermal stratification and animal habitat preferences influence the distribution of eDNA in lakes. We sampled eDNA depth profiles of five dimictic lakes during both summer stratification and autumn turnover, each containing warm- and cool-water fishes as well as the cold-water stenotherm, lake trout (<i>Salvelinus namaycush</i>). Habitat use by <i>S. namaycush</i> was validated by acoustic telemetry and was significantly related to eDNA distribution during stratification. Fish eDNA became "stratified" into layers during summer months, reflecting lake stratification and the thermal niches of the species. During summer months, <i>S. namaycush</i>, which rarely ventured into shallow waters, could only be detected at the deepest layers of the lakes, whereas the eDNA of warm-water fishes was much more abundant above the thermocline. By contrast, during autumn lake turnover, the fish species assemblage as detected by eDNA was homogenous throughout the water column. These findings contribute to our overall understanding of the "ecology" of eDNA within lake ecosystems, illustrating how the strong interaction between seasonal thermal structure in lakes and thermal niches of species on very localised spatial scales influences our ability to detect species.</p>
Phenological changes in stratification and overturning of Northern Hemisphere ice-covered lakes
<p>The data and codes to reproduce analysis and visualization in the paper entitled "Projected phenological shifts in stratification and overturning of ice-covered Northern Hemisphere lakes"</p>
Dataset for "Winter inverse lake stratification under historic and future climate change"
<p>Summary results for Woolway et al., Winter inverse lake stratification under historic and future climate change. See README file for specific information on the variables provided.</p>
Near-bed stratification controls bottom hypoxia in ice-covered alpine lakes
<p>Dataset supporting the study of the development of near-bottom hypoxia in high-altitude lakes.</p> <p>Herein, hypoxia is set for dissolved oxygen concentrations equal to or below 2 mg/l</p> <p>Variables: Lake (name of the lake), Year (corresponding winter of measurements),Max_depth (lake'smax depth, in m),Lake_surface (lake's surface area in m2), Drainage_ratio (unitless), Percent_macrophyte_cover (lake's average macrophyte cover, in %), Catchement_NDVI (unitless),Secchi (Secchi depth in m, measured over the previous summer), ice_duration (estimated duration of the ice cover, in days), T_ice_on (average water column temperature at the date of ice_on, in °C), DOinit (average concentration in dissolved oxygen at ice-on, in mg/l), DOinitsat (average saturation in dissolved oxygen_DO_ at ice-on, in %), time_under_hypoxia (duration in days of near-bottom hypoxia under the ice), time_to_hypoxia (time in days to reach near-bottom hypoxia under the ice, after the onset of ice), Kexp (near_bottom DO decay rate under the ice, in /d), Klm (rate of near_bottom DO decrease under the ice, in mg/l/d), Kheat (deep warming rate under the ice, in /d).</p> <p>see the corresponding paper for more details</p> <p> </p>
Thermal stratification and fish thermal preference explain vertical eDNA distributions in lakes
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Data from: Contrasting taxonomic stratification of microbial communities in two hypersaline meromictic lakes
Hypersaline meromictic lakes are extreme environments in which water stratification is associated with powerful physicochemical gradients and high salt concentrations. Furthermore, their physical stability coupled with vertical water column partitioning makes them important research model systems in microbial niche differentiation and biogeochemical cycling. Here, we compare the prokaryotic assemblages from Ursu and Fara Fund hypersaline meromictic lakes (Transylvanian Basin, Romania) in relation to their limnological factors and infer their role in elemental cycling by matching taxa to known taxon-specific biogeochemical functions. To assess the composition and structure of prokaryotic communities and the environmental factors that structure them, deep-coverage small subunit (SSU) ribosomal RNA (rDNA) amplicon sequencing, community domain-specific quantitative PCR and physicochemical analyses were performed on samples collected along depth profiles. The analyses showed that the lakes harbored multiple and diverse prokaryotic communities whose distribution mirrored the water stratification patterns. Ursu Lake was found to be dominated by Bacteria and to have a greater prokaryotic diversity than Fara Fund Lake that harbored an increased cell density and was populated mostly by Archaea within oxic strata. In spite of their contrasting diversity, the microbial populations indigenous to each lake pointed to similar physiological functions within carbon degradation and sulfate reduction. Furthermore, the taxonomy results coupled with methane detection and its stable C isotope composition indicated the presence of a yet-undescribed methanogenic group in the lakes' hypersaline monimolimnion. In addition, ultrasmall uncultivated archaeal lineages were detected in the chemocline of Fara Fund Lake, where the recently proposed Nanohaloarchaeota phylum was found to thrive.
Data from: Contrasting taxonomic stratification of microbial communities in two hypersaline meromictic lakes
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All observational data for the study "Mixing, stratification and plankton under lake-ice: implications for summertime oxygen levels in the hypolimnion of a large lake"
<p>All field measurements of temperature, oxygen, conductivity, and velocity used in this study</p>
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