cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.26198708.v1
title: Chronosequence dataset Ecology (in review).xlsx

description: <i>Nothofagus</i> species (southern beeches) are the only widespread ectomycorrhizal canopy trees in the humid temperate forests of the southern hemisphere. Researchers working in South America, New Zealand and Australia have come to different conclusions about the causes of spatial and temporal partitioning of landscapes between ectomycorrhizal (ECM) <i>Nothofagus</i> and arbuscular mycorrhizal (AM) trees. We used two-stage landslide chronosequences to examine the environmental drivers of successional trajectories of the mycorrhizal makeup of south-temperate rainforests. We used structural equation modelling (SEM) to address two hypotheses: (1) soil N:P ratios mediate the relative abilities of <i>Nothofagus</i> and AM trees to colonize landslide scars, and (2) soil C:N ratios determine the ability of AM trees to invade the understories of established stands and potentially replace <i>Nothofagus</i>. Hypothesis (1) was not supported, as mean annual temperature (MAT) was the only significant predictor of the mycorrhizal makeup of early-successional stands. Hypothesis (2) was supported, as soil C:N was the sole significant predictor of the mycorrhizal makeup of understories of established forests, being negatively correlated with AM representation in understoreys. Soil C:N in beneath established forests was in turn influenced by MAT, by % <i>Nothofagus</i> overstorey dominance in established forests, and by soil N and N:P ratios beneath early-successional stands. Marked continental disparities in soil parent materials and typical C:N ratios underlie the well-documented differences between south-central Chile and Tasmania in the dependence of <i>Nothofagus</i> regeneration on exogenous disturbance. Our results leave unanswered questions about the circumstances that favour <i>Nothofagus</i> capture of disturbed sites, but support modelling studies that have identified soil C:N ratio and inherent site nutrient status as key controls on AM/ECM dynamics in later successional stages.
DOI: 10.18739/a2n87320m
title: Chemical, elemental, and isotopic measurements of the upper 8000 years of the archived REnland ice CAP (RECAP) ice core from the Renland ice cap in east-central Greenland; 2022-2024

description: The overall objective of this research was to develop and interpret detailed records of Arctic lead pollution during the past ~8000 years to better understand the development, history, and impacts of mining and metallurgy from the late Neolithic period to present. The dataset contains high-resolution (30 millimeters [mm] average) measurements of elements, chemical species, and water isotopic ratios in the upper ~520 meters [m] of the archived REnland ice CAP (RECAP) ice core. Included are lead and other parameters such as the rare-earth-element cerium, non-sea-salt calcium, sulfur and sodium used for chronology development and interpretation of the lead record. The core was collected in 2015 from the Renland Ice Cap in east-central Greenland. No archive was available for the upper 99.6 m so the most recent part of the record corresponds to 116 years before 1950 (yb1950) or 1833 current era (CE).
DOI: 10.18739/a2nc5sf22
title: Machine learning-based Arctic-boreal terrestrial ecosystem Carbon Dioxide (CO2) fluxes, 2001-2020

description: This dataset provides gridded estimates of gross primary productivity (GPP), ecosystem respiration (Reco), and net ecosystem CO2 exchange (NEE) across the circumpolar terrestrial Arctic-boreal region at a 1-km spatial resolution. Monthly CO2 flux data from 2001 to 2020 were generated using terrestrial eddy covariance and chamber CO2 flux observations, combined with geospatial meteorological, remote sensing, topographical and soil data, all within a random forest modeling framework. Aggregated average annual NEE, average annual NEE with direct fire emissions added based on the Global Fire Emissions Database (GFED) product, and temporal trends in annual NEE rasters over 2002-2020 are also included. The data are provided in NetCDF and GeoTIFF formats.
DOI: 10.6084/m9.figshare.29212250
title: The effects of landscape on visual preference and fatigue recovery among university students: differences in gender, grade level and major

description: The data covers stress recovery from 98 college students watching different landscape spaces and blank controls.
DOI: 10.6084/m9.figshare.29212250.v2
title: The effects of landscape on visual preference and fatigue recovery among university students: differences in gender, grade level and major

description: The data covers stress recovery from 98 college students watching different landscape spaces and blank controls.
DOI: 10.6084/m9.figshare.29212250.v1
title: 景观对大学生视觉偏好和疲劳恢复的影响：性别、年级和专业差异

description: The data covers stress recovery from 98 college students watching different landscape spaces and blank controls.
DOI: 10.18739/a2ng4gt7b
title: Modern Plant Data Qaupat Lake (Lake QPT) Baffin Island, 2022

description: Sedimentary plant wax δ 2H values are common proxies for hydrology, a poorly constrained variable in the Arctic. However, it can be difficult to distinguish plant waxes derived from aquatic versus terrestrial plants, causing uncertainty in climate interpretations. We test the hypothesis that Arctic lake sediment mid- and long-chain plant waxes derive from aquatic and terrestrial plants, respectively. We compare n-alkanoic acid and n-alkane chain-length distributions and n-alkanoic acid δ2H and δ13C values of the 29 most abundant modern plant taxa to those for soils, water filtrates, and lake sediments in the Qaupat Lake (QPT) catchment, Nunavut, Canada. Chain length distributions are variable among terrestrial plants, but similar and dominated by mid-chain waxes among submerged/floating aquatic plants. Sedimentary wax distributions are similar to those in submerged/floating aquatic plants and to Salix spp., which are among the most abundant terrestrial plants in the QPT catchment. Mid-chain n-alkanoic acid δ2H values are similar in sediments and submerged/ floating aquatic plants, but 50‰ lower than Salix spp. In contrast, sedimentary long-chain n-alkanoic acid δ2H values fall between those for submerged/floating aquatic plants and Salix spp. We therefore infer that mid-chain waxes in QPT are primarily from aquatic plants, whereas long-chain waxes are from a mix of terrestrial and aquatic plants. In Arctic lakes like QPT, terrestrial wax transport via leaf litter and surface flow is limited by low-lying topography and sparse vegetation. If these lakes also have abundant aquatic plants growing near the sediment-water interface, the aquatic plants can contribute large portions of sedimentary waxes.
DOI: 10.18739/a2nk3669k
title: Winter snow and sea ice thermal conductivity, density, and conductive heat flux profiles from the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition, central Arctic, October 2019 - March 2020

description: This dataset includes derived snow and sea ice properties from various ice mass balance instruments deployed during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition drifting with the central Arctic sea ice pack from fall 2019 through fall 2020. Variables include profiles of thermal conductivity, density, and conductive heat flux through sea ice and snow. Thermal conductivity and density are derived by inverting the one-dimensional heat equation using temperature profiles from three seasonal ice mass balance (SIMB3) buoys and ten Snow and Ice Mass Balance Arrays (SIMBA), collectively referred to as IMBs. Thermal conductivity is combined with temperature profiles to calculate conductive heat flux. This dataset contains one file per instrument for the full period of its operation. All files contain a quality control flag that includes some automatic filters that identify when thermal conductivity estimates are outside the range of 0-3 W m-1 K-1 (watts per meter Kelvin) as well as for manually determined times when data may be less reliable. Data have time resolution of 4 (SIMB3) or 6 (SIMBA) hours during October to March, when temperature data is available for a given instrument. All data have a vertical resolution of 2 centimeters (cm).
 Additional details about the methods and uncertainties can be found in Sledd et al. (submitted).
 Sledd, A., M.D. Shupe, A. Solomon, C.J. Cox, D. Perovich, R. Lei (submitted): Snow thermal conductivity and conductive flux in the Central Arctic: estimates from observations and implications for models. Elementa: Science of the Anthropocene.
DOI: 10.7910/dvn/vaelhz
title: Livelihood Diversification and Food Security: Evidence From Maize-Growing Households In Techiman Municipality of Ghana

description: This is the data for the research
DOI: 10.18739/a2nv99c74
title: Arctic coastal groundwater measurements, geophysical data, hydraulic parameters, from Simpson and Kaktovik Lagoons along the Beaufort Sea in the North Slope, Alaska, from 2019-2021..

description: The data provided here is published as a supplementary information to the article named "Coastal supra-permafrost aquifers of the Arctic and their significant groundwater, 6 carbon, and nitrogen fluxes" by Demir, C., McClelland, J. W., Bristol, E., Charette, M. A., Cardenas, M. B..
 In this study, using field observations, analytical solutions and numerical models, we aimed to understand the importance of summer fresh submarine groundwater discharge (FSGD) for the hydrology and biogeochemistry of Arctic subterranean estuaries along the Beaufort Sea coast of Alaska. The field component of our study was completed at nearshore areas across the beach, from supra-tidal, inter-tidal, to sub-tidal zones, of Simpson and Kaktovik Lagoons. These lagoons were selected as two endmembers of the lagoon-groundwater systems bordered by barrier islands located along the Beaufort Sea coast in Northern Alaska. All the reported in situ measurements were done along transects of piezometers at each site. In Simpson Lagoon, we installed two shore-perpendicular transects (A, B) of partially screened piezometers, approximately 42 meters (m) away from each other. In Kaktovik Lagoon, a shore-perpendicular (~25 m long) transect was installed. Pressure transducers were installed inside the piezometers to monitor water level, temperature, and salinity at a measurement point depending on the screened interval length and position within each piezometer. Along the piezometer transects at each site, we installed multi-depth temperature sensors (HOBO 4-channel loggers and Alpha Mach Trods) into the sediment/seabed to capture the spatial distribution of temperatures in the beach and intertidal zone, as well as to estimate groundwater fluxes using heat as a tracer. Electrical resistivity imaging (ERI) surveys were implemented in three perpendicular directions forming a T-shape in Simpson Lagoon site A: (1) Lagoon bottom along the piezometer transect, (2) Shore parallel and (3) Tundra. Hydraulic conductivity of the disturbed/undisturbed sediment was calculated with various methods. We calculated the vertical groundwater flux via 3 different methods (1) vertical heat tracing, (2)Darcy's Law with vertical head gradients, and (3) numerical models. The fresh groundwater dissolved organic carbon (DOC), nitrogen (DON), carbon dioxide (Co2(aq)), and inorganic carbon (DIC) empirical datasets of different sizes, as well as the numerically derived fresh groundwater fluxes for Kaktovik and Simpson Lagoons, were fitted with lognormal distributions and randomly sampled. The distributions of concentrations and fresh groundwater fluxes were multiplied to estimate the FSGD derived
 DOC - DON - CO2(aq) - DIC mass fluxes. Here we provide all the mentioned field-measured dataset, model files and the output groundwater flux dataset of the explained analyses.
DOI: 10.18739/a2nv99c8m
title: Changes in Cell Abundance of Colwellia psychrerythraea 34H in Response to Perchlorate-Containing Media at Subzero Temperatures, 2021-2022

description: Liquid water is essential to life as we know it, yet most planets and moons in our solar system have surface temperatures well below the freezing point of pure water. As part of an effort to identify potential biosignatures and biosignature targets for upcoming space-exploration life detection missions, arctic strain Colwellia psychrerythraea 34H was incubated at -1 degrees Celsius (°C) and -15°C over the course of 15 days in optimal media (half-strength marine broth 2216) and optimal media amended with perchlorate ions (Wet Chemistry Lab; WCL solution, at a 1:30 ratio). Comparative cell abundance measurements are provided in two forms - direct counts via epifluorescent microscopy and optical density at 600 nanometers (nm). This research was undertaken at the Applied Physics Laboratory at the University of Washington, Seattle between 2021 and 2022.
DOI: 10.7266/n7-tv8b-7h23
title: Hepatic polycyclic aromatic hydrocarbons (PAHs) in Gulf and Southern Hake collected aboard multiple R/V Weatherbird II cruises in the Gulf of Mexico from 2012-08-21 to 2015-09-24
DOI: 10.18739/a2p26q55p
title: Elevated Carbon Dioxide (CO2) Growth Chamber Experiment - Utqiagvik, Alaska, 07/2023

description: Wet sedge-dominated tundra exhibits particularly high rates of methane (CH4) flux due to the presence of aerenchyma and therefore, plant-mediated transport of CH4. Yet the response of CH4 to future carbon dioxide (CO2) concentrations is still largely uncertain. Model predictions assumed that elevated CO2 (eCO2) will increase primary production and, as a result, CH4 emissions, but this has been poorly tested given the challenges of conducting eCO2 experiments in the Arctic. To address this knowledge gap, we tested the response of CH4 fluxes in soil and vegetation cores from Utqiagvik, Alaska to eCO2. The soil cores collected during the peak season in July were subject to ambient and elevated levels of CO2 in a growth chamber experiment. CO2 and CH4 fluxes from the cores were measured intermittently. The shoot biomass of various vegetation functional groups were extracted and weighed at the end of the study.
DOI: 10.18739/a2p55dj7h
title: Water isotopes from Lake Tininnilik region, West Greenland, July 2022

description: Lake Tinninilik is an ice-marginal lake in western Greenland. It is dammed by Sarqardliup Glacier to the East and North, and drains on a quasi-decadal timescale when lake volume reaches a critical threshold. When Lake Tininnilik does drain, it discharges ~2 cubic kilometers (km3) of lake water in Sarqardleq Fjord to the North. Water samples were collected in July 2022 from streams around the lake and surface and depth water samples from the lake itself during a periodic low-stand. Paired d18O and dD analyses are provided here and are used in this study to understand end-member water source fractions in the lake as well as insight into lake mixing. Complementary data (trace metal (ICP-MS), ion (ion chromatography), and nutrient (colorimetric nutrient analysis) geochemical data) are reported elsewhere (doi:10.18739/A2F47GW34). The aim of the project is to understand whether Greenland ice-marginal lakes are an important source of nutrients to coastal waters into which they drain.
DOI: 10.18739/a2p843x9b
title: In Situ Data on Ground Collapse along a Water Track in the Galbraith Lake Basin, 2023 - 2024

description: This dataset was used to study the drivers of ground collapse within a water track following a heavy rainfall event in July 2023 in the Galbraith Lake Basin. To study gully initiation and progression, we took repeat active layer thickness measurements along a transect upstream of the gully, installed thermocouple in hillslope at depths ranging from 2 centimeters (cm) to 20 cm, and in the water track at depths 2 cm to 20 cm. Additionally, thermocouple was installed to measure air temperature in a radiation shield, and to measure precipitation temperature following the methods of Anderson et al., 1998. This dataset includes precipitation data, air temperature and near surface ground temperature data in the water track and the hillslope, ground ice observations, and active layer thickness. Using this dataset, we assessed the drivers of thermo-erosional gully formation and progression and examined controls including rainfall, massive ground ice, changes in active layer thickness, and temperature on gully expansion.
DOI: 10.18739/a2pc2tb48
title: Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) L4 Monthly Gridded Sea Ice Thickness, Version 3

description: This data set reports monthly, gridded winter sea ice thickness across the Arctic Ocean. Sea ice thickness is estimated using ATLAS/ICESat-2 L3A Sea Ice Freeboard (ATL10) Version 6 data and NASA Eulerian Snow On Sea Ice Model (NESOSIM) snow loading.
 Petty, A. A., Kurtz, N., Kwok, R., Markus, T., Neumann, T. A. &amp; Keeney, N. (2023). ICESat-2 L4 Monthly Gridded Sea Ice Thickness. (IS2SITMOGR4, Version 3). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ZCSU8Y5U1BQW. [describe subset used if applicable]. Date Accessed.
DOI: 10.18739/a2pg1hq5m
title: Ice thickness and surface elevation survey of Teshekpuk Lake in northern Alaska during late winter 2024

description: At 850 square kilometers (km2), freshwater Teshekpuk Lake stands out among abundant thermokarst lakes of the Arctic Coastal Plain of northern Alaska. Its size, latitude, and proximity to the Beaufort Sea coast make long (&gt;9 months) seasonal ice-cover its dominant regime, which likely plays a role in the regions value in waterbird and caribou habitat. Despite these important characteristics related to ice regime, little scientific attention has been given to this lentic system. Extensive ice thickness and snow depth surveys conducted using ice penetrating radar and Unmanned Aerial Vehicle (UAV) imaging in April 2024 is helping us understand surface patterns across this massive lake in relation to winter wind-fetch, pressure ridges, and bathymetry. Data are organized by ground-penetrating radar transects summarized at 10-meter (m) increments of ice thickness with calibration ice thickness and snow depth measurements collected at transect endpoints. Drone (UAS) surveys with real-time kinematic elevation base-station corrections were made along portions of these transects and opus-corrected structure-for-motion digital elevation models were used to estimate surface elevations. These data are primarily intended to severe as calibration and validation data for the new Surface Water and Ocean Topography (SWOT) mission and similar remote sensing applications, but also provide an opportunity to understand ice and snow variability and the formation and impact of pressure ridges and lake bathymetry in this unusually large arctic lake. During this survey, water samples were also collected for environmental DNA analysis to assess fish community presence and these will be reported elsewhere.
DOI: 10.18739/a2pg1hq63
title: Sediment geochemical data from the Bering Shelf and Yukon Delta, Eastern Bering Sea, June 2023

description: This dataset contains geochemical and grain size measurements of seabed and suspended sediment samples collected from the Bering Shelf and Yukon prodelta in June 2023. These samples were collected during the 6-12 June 2023 Arctic Chief Scientist Training Cruise, which was a short cruise on the R/V Sikuliaq during its transit from Seward, Alaska to Nome, Alaska. The cruise was sponsored by the University National Oceanographic Laboratory System (UNOLS) Arctic Icebreaker Coordinating Committee and the National Science Foundation.
 These data were generated as a pilot data set to understand the fate of terrestrial organic carbon in the Yukon River delta and adjacent Bering Sea. Seabed sediment was collected at three locations (MC04, MC06, and MC08) using a multicorer. One seabed sediment sample was collected using a van veen grab sampler. Suspended sediment samples were collected using a hand-deployed niskin bottle and transferred into a clean 10-liter cubitainer for transport and temporary storage. Suspended sediment was filtered on the ship within 24 hours of collection using a Geotech barrel filter with a 0.45 micron Polyethersulfone (PES) membrane filter. Multicores were extruded on deck and subsamples were transferred to sterile whirl-pak sample bags. All sediment samples were frozen and subsequently shipped back to the lab in coolers.
 Sediment samples were analyzed for grain size, bulk elemental composition via X-ray fluorescence (XRF), and organic carbon and nitrogen concentrations and isotopes via EA-IRMS (elemental analyzer-isotope ratio mass spectrometry). Grain size distributions were measured using a Malvern mastersizer laser diffraction particle size analyzer at the University of Colorado Boulder. Bulk elemental composition was measured on the Rigaku XRF in the Analytical Geochemistry Lab at the University of New Mexico. Total organic carbon (TOC), total nitrogen (TN), and carbon/nitrogen isotopes were measured at the Center for Stable Isotopes at the University of New Mexico. Prior to EA-IRMS analyses, sediment samples were acid-treated to remove inorganic carbon following the method of Galy et al., 2007.
 References
 Galy, V., Bouchez, J., & France‐Lanord, C. (2007). Determination of total organic carbon content and δ13C in carbonate‐rich detrital sediments. Geostandards and Geoanalytical research, 31(3), 199-207.
DOI: 10.18739/a2pk0739t
title: Mooring data from Harrison Bay, Alaska, July-August 2021

description: Four small coastal moorings were deployed in water depths of ~5-6 meters (m) on the Colville Delta front and one site farther west for a period of approximately one week in Jul/Aug 2021. Moorings were outfitted with sensors to collect a variety of data including water levels (at all sites), turbidity/total suspended solids, water velocity, salinity, temperature, and light intensity. Light intensity measurements were also collected from a vessel-mounted sensor (included in the MM3 data package) to allow for calculation of light attenuation at the mooring. These data are described more fully in a companion publication (Eidam, "Summertime water and particle properties on an ice-influenced Arctic shelf", in prep as of March 2025).
DOI: 10.18739/a2pn8xh39
title: Ground-penetrating radar profiles from King Col and Eclipse Icefield; Alaska 2016-2017

description: The overall project aimed to address the lack of sufficient understanding of late Holocene precipitation in the Northeast Pacific region using field measurements, remote sensing, and numerical reanalysis methods. The Eclipse Icefield is one of the largest icefields in the St. Elias Range and supplies ice to some of North America’s largest glaciers. The specific objectives of the project were to 1) develop bedrock topography maps of the surveyed sites, 2) determine surface velocities at all sites, 3) map near-surface spatial accumulation rate patterns, 4) trace internal isochrones at each site, 5) estimate ice deformation effects on layer thinning, 6) produce updated and corrected accumulation time series, and 7) compare corrected records from Mt. Hunter and St. Elias ice cores to evaluate spatial precipitation patterns over the past millennium.
 The purpose of this Ground-Penetrating Radar (GPR) data set was to 1) determine ice thickness at each site, 2) map snow and ice layer thickness and estimate deformation, 3) determine the location of internal isochrones.