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85 results for “high-latitudes”
Physiological acclimatization in high-latitude zooplankton
<p>How individual organisms adapt to non-optimal conditions through physiological acclimatization is central to predicting the consequences of unusual abiotic and biotic conditions such as those produced by marine heat waves. The Northeast Pacific, including the Gulf of Alaska experienced an extreme warming event (2014-2016, "The Blob") that affected all trophic levels leading to large-scale changes in the community. The marine copepod <i>Neocalanus flemingeri</i> is one key member of the subarctic Pacific pelagic ecosystem. During the spring phytoplankton bloom this copepod builds substantial lipid stores as it prepares for its non-feeding adult phase. A three-year comparison of gene expression profiles of copepods collected in Prince William Sound in the Gulf of Alaska between 2015 and 2017 included two high-temperature years (2015 and 2016) and one year with very low phytoplankton abundances (2016). The largest differences in gene expression were between high and low chlorophyll years, and not between warm and cool years. The observed gene expression patterns are indicative of physiological acclimatization. The predominant signal in 2016 was the down-regulation of genes involved in glycolysis and its incoming pathways, consistent with the modulation of metabolic rates in response to prolonged low food conditions. Despite the down-regulation of genes involved in metabolism, there was no evidence of suppression of protein synthesis based on gene expression or behavioral activity. Genes involved in muscle function were up-regulated, and the copepods were actively swimming and responsive to stimuli at collection. However, genes involved in fatty acid metabolism were down-regulated in 2016, suggesting reduced lipid accumulation. </p>
Supplemental data to Magnitude and Origin of CO2 evasion from high-latitude lakes
<p>Supplemental dataset to the publication: Supplemental data to Seasonal Shifts in Magnitude and Source Contribution of CO2 evasion from High-latitude Lakes submitted to Journal of Geophysical Research: Biogeosciences</p>
Model output for: "Freshwater input from glacier melt outside Greenland alters modeled northern high-latitude ocean circulation"
<p>NEMO-ANHA4 and OGGM model output files used in the article: "Freshwater input from glacier melt outside Greenland alters modeled northern high-latitude ocean circulation".</p> <p> </p> <p>halfsolid.zip and noOGGM.zip contain output of the runs called <em>halfsolid</em> and <em>noOGGM</em> in the article. output_data_OGGM.zip contains the output files of OGGM runs.</p>
on the annual asymmetry of high-latitude sporadic-F
<p>sami3 dataset used in the paper 'on the annual asymmetry of high-latitude sporadic-F'</p>
The simulation data for paper: Permafrost Response in Northern High-Latitude Regions to 1.5 °C Warming and Overshoot Scenarios Achieved via Solar Radiation Modification
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Importance of Longwave Radiative Forcing by Icy Clouds in Maintaining Miocene High-latitude Warmth
<p>Supporting Information for<strong> Importance of Longwave Radiative Forcing by Icy Clouds in Maintaining Miocene High-latitude Warmth</strong></p> <p>NetCDF files: B.MIO_400_C5.cam2.h0.last50yr_climo_monthly.nc is from our control experiment, and B.MIO_400_C5_MK_TeoKor_Dem1SLF_2.cam2.h0.last50yr_climo_monthly is from our modified experiment.</p> <p>cldwat2m_micro.F90, microp_aero.F90, microp_driver.F90, and zm_conv.F90 are the source code used in our modified experiment. </p> <p> </p>
Data from: Climatic thresholds shape northern high-latitude fire regimes and imply vulnerability to future climate change
Boreal forests and arctic tundra cover 33% of global land area and store an estimated 50% of total soil carbon. Because wildfire is a key driver of terrestrial carbon cycling, increasing fire activity in these ecosystems would likely have global implications. To anticipate potential spatiotemporal variability in fire-regime shifts, we modeled the spatially explicit 30-yr probability of fire occurrence as a function of climate and landscape features (i.e. vegetation and topography) across Alaska. Boosted regression tree (BRT) models captured the spatial distribution of fire across boreal forest and tundra ecoregions (AUC from 0.63–0.78 and Pearson correlations between predicted and observed data from 0.54–0.71), highlighting summer temperature and annual moisture availability as the most influential controls of historical fire regimes. Modeled fire–climate relationships revealed distinct thresholds to fire occurrence, with a nonlinear increase in the probability of fire above an average July temperature of 13.4°C and below an annual moisture availability (i.e. P-PET) of approximately 150 mm. To anticipate potential fire-regime responses to 21st-century climate change, we informed our BRTs with Coupled Model Intercomparison Project Phase 5 climate projections under the RCP 6.0 scenario. Based on these projected climatic changes alone (i.e. not accounting for potential changes in vegetation), our results suggest an increasing probability of wildfire in Alaskan boreal forest and tundra ecosystems, but of varying magnitude across space and throughout the 21st century. Regions with historically low flammability, including tundra and the forest–tundra boundary, are particularly vulnerable to climatically induced changes in fire activity, with up to a fourfold increase in the 30-yr probability of fire occurrence by 2100. Our results underscore the climatic potential for novel fire regimes to develop in these ecosystems, relative to the past 6000–35 000 yr, and spatial variability in the vulnerability of wildfire regimes and associated ecological processes to 21st-century climate change.
TIEGCM simulation for high-latitude zonal winds
<p>Description of Data in the "windwall_data.mat":</p> <p>UN: modeled zonal winds (m/s)</p> <p>DUDT_UN: the acceleration due to total forces (cm/s^2);</p> <p>FD_UN: the acceleration due to ion drag (cm/s^2);</p> <p>ZL: the acceleration due to pressure gradient (cm/s^2);</p> <p>VIS_VERT_UN: the acceleration due to viscosity (cm/s^2);</p> <p>COR_UN: the acceleration due to Coriolis (cm/s^2); </p> <p>CENT_UN: the acceleration due to centrifugal (cm/s^2);</p> <p>NE: ionospheric electron density (cm^{-3})</p> <p>UI: zonal ExB (m/s)</p> <p>"TIEGCM_modeled_UN_windwall_fig2.rar" is modeled wind data in Figure 2</p> <p>"clt_*.mat" and "cmlat_*.mat" are geomagnetic local time and latitudes,</p>
Data from: Extrapolating multi-decadal plant community changes based on medium-term experiments can be risky: evidence from high-latitude tundra
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Data from: Birth dates vary with fixed and dynamic maternal features, offspring sex, and extreme climatic events in a high-latitude marine mammal
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Data from: Climate warming is predicted to enhance the negative effects of harvesting on high-latitude lake fish populations
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Data from: Food-web structure varies along environmental gradients in a high-latitude marine ecosystem
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Physiological acclimatization in high-latitude zooplankton
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Data from: Assessing the effects of human activities on the foraging opportunities of migratory shorebirds in Austral high-latitude bays
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Data from: Climatic thresholds shape northern high-latitude fire regimes and imply vulnerability to future climate change
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Data from: Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes
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FIGURE 3 in Taxonomy of high-latitude Goniasteridae (Subantarctic & Antarctic): one new genus, and three new species with an overview and key to taxa
FIGURE 3. Character distribution and bathymetric range of Chitonaster spp.
Data from: Population genetics of a broadcast-spawning coral across a tropical-temperate transition zone reveals regional differentiation and isolation of high-latitude reefs
<p>Aim: Genetic connectivity is a key component of species resilience to climate change in terms of recovery capacity following disturbance and capacity to disperse to novel locations as the climate warms and isotherms shift poleward. We aimed to strengthen our understanding of resilience in this context by characterizing patterns of connectivity and genetic diversity in a broadcast spawning coral across a tropical-temperate transition zone. We hypothesize genetic differentiation between tropical and temperate populations and decreasing genetic diversity with higher latitudes.</p> <p>Location: Western Australia (WA).</p> <p>Taxon: <i>Turbinaria </i>species complex. <i>Turbinaria reniformis </i>Oken, 1815 (Dendrophylliidae).</p> <p>Methods: Samples from 930 target corals were collected from ten locations between 13 - 32<sup> o</sup> latitude spanning a 9° C mean temperature range. <i>In-situ</i> species identification of <i>T. reniformis </i>is hindered by morphological plasticity and homoplasy with sister species. We<i> </i>combined Sanger sequencing of two mitochondrial DNA markers and high-throughput genotyping by sequencing (GBS) to isolate a single genetic <i>Turbinaria</i> lineage from our dataset through which patterns of genetic flow and diversity along the WA coastline could be explored using population- and individual-based analyses.</p> <p>Results: Mitochondrial DNA sequence variation was low among <i>Turbinaria</i> samples and could not resolve individual species. Using GBS, we identified three genetically distinct lineages. Subsequent analyses within one of these lineages revealed strong spatial subdivision with 2-3 genetic clusters. While temperate populations were genetically diverged from more tropical sites, we did not observe declines in genetic diversity with latitude.</p> <p>Main Conclusions: Temperate coral populations in Western Australia are genetically isolated from their tropical counterparts. Tropical populations of <i>T. 'reniformis' </i>exhibit adequate connectivity.<i> </i>Shark Bay represents the current southern limit of the tropical population of <i>T. 'reniformis'</i>. Interestingly, temperate <i>T. 'reniformis'</i> in this study exhibit some genetic resilience due to their relatively high genetic diversity, yet the strong patterns of genetic subdivision for this widely dispersing coral species potentially limit their resilience to future climate scenarios.</p>
MIDAS GPS TEC data for "On the Annual Asymmetry of High-Latitude Sporadic-F" (Space Weather)
<p>GPS-based TEC data related to high-latitude ionospheric variability in 2014</p>
Data from: Population genetics of a broadcast-spawning coral across a tropical-temperate transition zone reveals regional differentiation and isolation of high-latitude reefs
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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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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.