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58 results for “lake warming”
Air and soil temperature in warmed and control plots of 2014 reciprocal transplant gardens Toolik Lake, Coldfoot, and Sagwon, Alaska 2015 and 2016
Air and soil temperatures from iButtons located at reciprocal transplant gardens at Toolik Lake, Coldfoot, and Sagwon in 2015 and 2016. The reciprocal transplant gardens at Coldfoot (CF), Toolik Lake (TL), Sagwon (SG) Each plot contains three tussocks, 30-50 centimeters apart
Population-adjusted pseudo global warming simulations over the Great Lakes Region
<p>Summaries of pseudo global warming simulations over the Great Lakes Region. Specifics below:</p> <p> </p> <p>Each CSV file provides regional summaries from PGW simulations, either over land, for urban grids, or rural grids. This includes cumulative hours above critical heat stress threholds as well as their population-adjusted values.</p> <p>The 'Future_sensitivities_land.csv' file calculates heat stress in the future by keeping all variables except one the same value as the historical run.</p> <p>Among the geotiffs, _perc_land files include percentage of hours in summer above the National Weather Service heat index and wet bulb globe temperature thresholds, _pop_land incorporate population adjusted heat stress above those thresholds, the TEMP_contribution files estimate changes in heat stress if only air temperature changed and all variables remained the same as historical values and the HI_ and WBGT_pop rasters include summer average heat stress and their corresponding populations. </p> <p>See Chakraborty et al. Under Review (will be updated on paper publication) for more details.</p>
High frequency temperature and dissolved oxygen data from 15 Adirondack lakes during the 2021 warm season
A full understanding of the contemporary status of lake dissolved oxygen and thermal habitat in the face of global change is enhanced by high-frequency monitoring that goes beyond periodic water column profiles of temperature and dissolved oxygen. The data contained herein were used to examine the relationship between both concurrent warming and increasing dissolved organic carbon (DOC) concentrations, and oxythermal habitat status for cold-water species. To obtain high resolution oxythermal habitat characteristics, fifteen lakes in the Adirondack Park of northern New York state were monitored from mid-June to mid-October of 2021. Lakes were outfitted with high-frequency temperature and dissolved oxygen logger chains located in most cases at the deepest point of each lake. Temperature loggers were placed throughout the water column while dissolved oxygen loggers were positioned to best capture low-oxygen portions of the water column based on data from previous years. To enhance vertical resolution, high-frequency data were supplemented with periodic water column profiles. In addition, to provide a comprehensive regional perspective, we include historical DOC and depth data from more than 1,400 Adirondack lakes. Finally, to enhance understanding of fish response to temperature, we include body temperature data from tagged brook trout for two of our intensively monitored lakes during part of the 2023 stratified period.
Data on phenological changes of benthic primary producers from Lake Saint-Pierre (1982-2019), Lake Müggelsee (2000-2021), Limnotron warming experiments and a literature synthesis
<p>This dataset regroup data on phenology of inland water benthic primary producers (macrophytes and periphyton) and includes five major data sources: a literature synthesis, long-term data on phenology from Lake Saint-Pierre (St. Lawrence River, Québec, Canada) and lake Müggelsee (Berlin, Germany), as well as two warming experiments. This data was assembled for a paper in review at Limnology and Oceanography Letters.</p> <p>Additionnal details are provided in the metadata file.</p> <p>Version 2 add some clarifications in the metadata, corrects typos in the pheno_litsearch_InlandLittoral.csv datasheet and added the datasheet pheno_litsearch_raw_responsevar.csv</p>
Cyanobacterial blooms in a warming climate: Paleolimnological assessments of three Boreal Shield lakes in central Ontario, Canada
Open the record for dataset details and reuse information.
Widespread loss of lake ice around the Northern Hemisphere in a warming world
Ice provides a range of ecosystem services, including fish harvest, cultural traditions, transportation, recreation, and regulation of the hydrologic cycle, to more than half of the world's 117 million lakes. One of the earliest observed impacts of climatic warming has been the loss of freshwater ice, with corresponding climatic and ecological consequences. However, while trends in ice cover phenology have been widely documented, a comprehensive large-scale assessment of lake ice loss is absent. Here, using observations from 513 lakes around the Northern Hemisphere, we identify lakes vulnerable to ice-free winters. Our analyses reveal the importance of air temperature, lake depth, elevation, and shoreline complexity in governing ice cover. We estimate that 14,800 lakes currently experience intermittent winter ice cover, increasing to 35,300 and 230,400 at 2degC and 8degC, respectively, impacting up to 394 and 656 million people. Our study illustrates that an extensive loss of lake ice will occur within the next generation, stressing the importance of climate mitigation strategies to preserve ecosystem structure and function, as well as local winter cultural heritage.
Bathymetry and latitude modify lake warming under ice (Dataset)
<p>Temperature profiles, time series of cross-sectional data and data displayed in the figures of the article entitled "Bathymetry and latitude modify lake warming under ice". Hydrol. Earth Syst. Sci., 25, 1813–1825, 2021. https://doi.org/10.5194/hess-25-1813-2021</p>
Interacting impacts of hydrological changes and air temperature warming on lake temperatures highlight the potential for adaptive management: Model output
<p>This archive includes the output from the General Ocean Turbulence Model for a series of simulations that used differing model drivers (inflow discharge, Q, and air temperature, T). The Experiment_output.zip contains text files generated from the GOTM workflow containing modelled water temperatures and the Mod_z.txt are the corresponding depths for these temperatures. </p><p>The file name corresponds to the change made to the driving data from baseline (unchanged conditions), a combination of air temperature <i>increase </i>and flow percentage change e.g. Mod_temp_T_2_Q_1.5 refers to an air temperature increase of 2 degrees Celsius and a flow increase of 50% and a Mod_temp_T_3.5_Q_0.7 refers to an air temperature increase of 3.5 degrees Celsius and a flow decrease of 30%.</p>
Data for: Climate warming and projected loss of thermal habitat volume in lake populations of brook trout
<p>We applied an ensemble of climate warming models and the seasonal temperature profile model for lakes (STM) to assess changes in brook trout thermal habitat volume (THV) among lakes (N=100) within a large, protected area under two climate warming scenarios, RCP 4.5 and RCP 8.5. Brook trout thermal habitat was defined as 9-17°C. Climate warming projections for the balance of this century, regardless of RCP category, will result in the loss of brook trout habitat in lakes that range widely in size. THV loss will be most extensive in lakes that are relatively shallow given their surface area. By 2071-2100 under RCP 4.5, the 90<sup>th</sup> percentile of THV loss = 31% vs. 63% under RCP 8.5. By the century's end under RCP 8.5, the protected area landscape will be a matrix of lakes with some serving as climate refugia (with reduced THV) and others having severe reductions in THV (>90<sup>th</sup> percentile THV loss).</p>
Data from: Climate refugia along Lake Superior's shores: Disjunct arctic-alpine plants rely on cool shoreline temperatures but are unlikely to persist under climate warming
<p>Climate refugia can serve as remnant habitat or stepping stones for species dispersal under climate warming. The largest freshwater lake by surface area, Lake Superior, USA and Canada, serves as a model system for understanding cooling-mediated local refugia, as its cool water temperatures and wave action have maintained shoreline habitats suitable for southern disjunct populations of arctic-alpine plants since deglaciation. Here we seek to explain spatial patterns and environmental drivers of arctic-alpine plant refugia along Lake Superior's shores, and assess future risk to refugia under moderate (+3.5 °C) and warmest (+5.7 °C) climate warming scenarios. First, we examined how the interactive effects of summer surface water temperatures and wind affected onshore temperatures, resulting in areas of cooler refugia. Second, we developed an ecological niche model for presence of disjunct arctic-alpine refugia (pooling 1253 occurrences from 58 species) along the lake's shoreline. Third, we fit species distribution models for 20 of the most common arctic-alpine disjunct species and predicted presence to identify refugia hotspots. Finally, we used the two climate warming scenarios to predict changes in presence of refugia and disjunct hotspots. Bedrock type, elevation above water, inland distance, July land surface temperature from MODIS/Terra satellite, and near-shore depth of water were the best predictors of disjunct occurrences. Overall, we predicted 2,236 km of the shoreline (51%) as disjunct refugia habitat for at least one species under current conditions, but this was reduced to 20% and 7% with moderate (894 km) and warmest (313 km) climate change projections.</p>
Long term lake mesocosm warming experiment: dataset of nitrous oxide concentrations, emissions and ancillary variables
<p>Dataset of nitrous oxide concentrations, emissions and ancillary variables collected at theLong term lake mesocosm warming experiment in Lemming, Denmark. </p>
Arctic warming drives striking 21st century ecosystem shifts in Great Slave Lake (Subarctic Canada), North America's deepest lake
<p>Great Slave Lake, one of the world's largest and North America's deepest lake, has undergone an aquatic ecosystem transformation in response to 21st-century accelerated Arctic warming that is unparalleled in at least the past two centuries. Algal remains from a series of high-resolution palaeolimnological records retrieved from the West Basin provide baseline limnological data that we compared to historical limnological and phycological surveys undertaken on Great Slave Lake between the 1940s and 1990s. We document the rapid restructuring of algal community composition ca. 2000 CE that is consistent with recent increases in regional air temperature, as well as declines in ice cover and wind speed, that would collectively alter habitats for aquatic biota (e.g. thermal regime, vertical mixing, turbidity, light and nutrients). This new limnological regime initiated the first observation of scaled chrysophytes and favoured the rapid proliferation of small planktonic cyclotelloid diatoms that replaced the long-established dominance of large filamentous <em>Aulacoseira islandica</em> in West Basin sedimentary assemblages. Such rapid transformations in the primary producers of this socio-ecologically valuable "northern Great Lake" may have widespread implications for the entire food web with unknown consequences for aquatic ecosystem functioning and fisheries, which many northern and Indigenous communities depend upon.</p>
Global LAke Surface water Temperature (GLAST): Global lakes are warming slower than surface air temperature due to accelerated evaporation
<p>This repository houses a dataset, known as the Global LAke Surface water Temperature (GLAST), which provides both temporal and spatial details at high resolution for 92,245 lakes worldwide during the period of 1981-2099, with 36% of them situated in Arctic regions. The dataset was established based on four decades (1982-2020) of Landsat satellite images and a physical model (FLake). For a comprehensive overview of the dataset's production methodology, please refer to the paper titled 'Global lakes are warming slower than surface air temperature due to accelerated evaporation' (Tong et al., 2023, Nature Water). Detailed information regarding each data file can be found in the 'readme.docx' file.</p>
Data from: Climate refugia along Lake Superior’s shores: Disjunct arctic-alpine plants rely on cool shoreline temperatures but are unlikely to persist under climate warming
Open the record for dataset details and reuse information.
Arctic warming drives striking 21st century ecosystem shifts in Great Slave Lake (Subarctic Canada), North America’s deepest lake
Open the record for dataset details and reuse information.
Data for: Climate warming and projected loss of thermal habitat volume in lake populations of brook trout
Open the record for dataset details and reuse information.
Data on weights and lengths from retrospective growth analysis of different stem age classes of Betula nana ramets from the Arctic LTER Nutrient and Warming manipulations in mosit acidic tussock tundra at 1995, Toolik Lake, AK.
This data file contains the data on weights and lengths from retrospective growth analysis of different stem age classes of Betula nana ramets from the Arctic LTER Nutrient and Warming manipulations in moist acidic tussock tundra at Toolik Lake.
Data from: Phytoplankton growth and stoichiometric responses to warming, nutrient addition and grazing depend on lake productivity and cell size
<p>Global change involves shifts in multiple environmental factors that act in concert to shape ecological systems in ways that depend on local biotic and abiotic conditions. Little is known about the effects of combined global change stressors on phytoplankton communities, and particularly how these are mediated by distinct community properties such as productivity, grazing pressure and size distribution. Here, we tested for the effects of warming and eutrophication on phytoplankton net growth rate and C:N:P stoichiometry in two phytoplankton cell size fractions (<30 μm and >30 μm) in the presence and absence of grazing in microcosm experiments. Because effects may also depend on lake productivity, we used phytoplankton communities from three Dutch lakes spanning a trophic gradient. We measured the response of each community to multifactorial combinations of temperature, nutrient, and grazing treatments and found that nutrients elevated net growth rates and reduced carbon:nutrient ratios of all three phytoplankton communities. Warming effects on growth and stoichiometry depended on nutrient supply and lake productivity, with enhanced growth in the most productive community dominated by cyanobacteria, and strongest stoichiometric responses in the most oligotrophic community at ambient nutrient levels. Grazing effects were also most evident in the most oligotrophic community, with reduced net growth rates and phytoplankton C:P stoichiometry that suggests consumer‐driven nutrient recycling. Our experiments indicate that stoichiometric responses to warming and interactions with nutrient addition and grazing are not universal but depend on lake productivity and cell size distribution.</p>
Datasets from PhD thesis: "Integrating classical and DNA-based approaches to advance the field of paleolimnology: Case studies of a warm monomictic lake"
<p>The general objectives of my PhD were to evaluate the advantages and limitations to using DNA-based methods in paleolimnology and to evaluate the ecological trajectory of Cultus Lake, British Columbia, using both classical paleolimnological and DNA-based approaches. The datasets therein were generated for my PhD thesis.</p> <p>Firstly, a 36-month sediment trap time series was developed to evaluate which DNA taxa can be deposited in the sediments and potentially be used as indicator taxa in paleolimnological studies. Congruence between morphological and DNA identification in water and sediment trap samples was also assessed specifically for diatoms and crustaceans. The data generated include mass accumulation rate and carbon accumulation rate, carbon and nitrogen percentage, morphological counts for diatoms and cladocerans in the sediment traps, DNA quantity for water and sediment trap samples, metabarcoding of a fragment of the V7 region of the 18S rRNA gene.</p> <p>Secondly, a multi-proxy paleolimnological study was developed to evaluate the ecological changes in Cultus Lake and the potential drivers of the changes. From this study, sedimentary delta 15N, delta 13C, percentage of carbon, percentage of nitrogen, pigments were measured and diatoms and cladoceran remains were counted and identified from a sediment core collected in 2008. The data for this project are part of a publication accepted in May 2020 in Journal of Paleolimnology: Gauthier et al (In press) Ecological dynamics of a peri-urban lake: a multi-proxy paleolimnological study of Cultus Lake (British Columbia) over the past ~200 years. doi: 10.1007/s10933-020-00147-9.</p> <p>Thirdly, a paleo-genetic project was developed to compare the ecological changes observed with sedimentary DNA with those observed with classical paleolimnological approaches. The same fragment of the V7 region of the 18S rRNA gene was targeted, percentage of carbon and nitrogen were also measured as well as DNA quantity for all intervals subsampled in a sediment core collected in 2017.</p> <p>The datasets usually come with a description of the data and meaning of abbreviations whether needed. DNA datasets will be publicly released upon acceptance of the manuscripts. For more information about the projects, methods and results, please refer to my PhD thesis published at McGill University. The number in front of the name of each file represents the chapter for which the data were generated.</p>
Data from: Local diversity in phenological responses of migratory lake sturgeon to warm winters
<p>Rich intraspecific diversity in traits that shape responses to environmental conditions implies that effects of climate change will differ within species or even populations. Nevertheless, few studies investigate how different groups within species respond to climatic fluctuations, and most risk assessments rely upon species-wide generalizations. We studied effects of among-year variation in air temperature on the spring migratory phenology of a metapopulation of lake sturgeon (<em>Acipenser fulvescens</em>) within waters connecting Lake Huron and Lake Erie of the Laurentian Great Lakes. Sturgeon here express multiple migratory phenotypes that all spawn in either the St. Clair River or Detroit River but differ in their use after spawning of more than 86,000 km<sup>2</sup> of accessible lake and river habitat. Acoustic tracking over nine years (2012-2020) revealed mixed phenological responses to late-winter air temperatures, with three migratory groups arriving at rivers earlier during warm years and one whose arrival was consistent across years regardless of temperature. Notably, two groups that spawn in the same river but overwinter in different lakes entered the river with greater synchrony during warm years because one advanced its phenology while the other did not. The results indicated warm weather could alter the dynamics of the metapopulation and broader community, and exemplify the complexity hidden beneath broadscale generalizations of species' response to climate change.</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.