cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a2fx74095
title: Salinity from discrete water samples collected from the Research Vessel Sikuliaq, Gulf of Alaska to Bering Sea, 2023

description: This data set includes measurements of water samples collected at hydrographic stations from the R/V Sikuliaq during the Arctic Chief Scientist Training cruise June 6–12, 2023 sponsored by the University National Oceanographic Laboratory System (UNOLS) Arctic Icebreaker Coordinating Committee and the National Science Foundation. SKQ202309T was utilized as a training expedition for early-career Arctic oceanographers, focusing on skills essential for leading research cruises. Training topics centered on logistics, how to request time on ships, how to coordinate personnel and equipment, how to plan for operations and survey tasks at sea, how to work with vessel crew and staff, and how to edit research plans based on field conditions. Participants collected various data sets opportunistically throughout the research training. The cruise transited from Seward to Nome and water samples were collected at six hydrographic stations for salinity (this data set). Specifically, this data set contains conductivity, temperature, and depth (CTD) measurements of salinity at discrete water depths and portasal measurements of water samples from the corresponding bottles. Bottle samples were collected in 200 milliliter (mL) borosilicate bottles which were rinsed at least three times before filling. The bottles were sealed with Nalgene screw caps and stored without freezing.
DOI: 10.18739/a2g15td1j
title: Radium and radon in massive ice, groundwater, seawater, and sediments in the Northwest Territories, Canada, 2019

description: Rapid warming in the Arctic is degrading permafrost and massive ice deposits, which releases solutes previously trapped in ice and frozen soils into groundwater, rivers, and the coastal ocean. Radium (Ra) and radon (Rn) isotopes are enriched in groundwaters and may therefore have utility as tracers for the delivery of permafrost-derived solutes to the ocean, particularly if massive ice- or permafrost- derived meltwaters have a distinct isotopic ratio. Radioactive (radium, radon) and stable (oxygen-18) isotopes were measured in massive ice, permafrost, groundwater, surface waters, and sediments on Tuktoyaktuk Island and Peninsula Point in the Northwest Territories, Canada, with the goal of identifying the isotopic signature of the massive ice endmember. To our knowledge, this is the first dataset that reports radium and radon activities in massive ice deposits.
DOI: 10.18739/a2g737582
title: Marine Mammal Watch, collected from the Research Vessel Sikuliaq, Northern Bering Sea to Chukchi Sea, 2024

description: The Pacific sector of the Arctic Ocean is experiencing major reductions in seasonal sea ice extent and increases in sea surface temperatures. One of the key uncertainties in this region is how the marine ecosystem will respond to seasonal shifts in the timing of spring sea ice retreat and/or delays in fall sea ice formation. Variations in upper ocean water hydrography, planktonic production and advection, pelagic-benthic coupling and sediment carbon cycling are all influenced by sea ice and temperature change. To more systematically track the broad biological response to sea ice retreat and associated environmental change, an international consortium of scientists have developed a coordinated Distributed Biological Observatory (DBO) that includes selected biological measurements at multiple trophic levels, along with satellite and mooring measurements. The DBO currently focuses on five regional biological "hotspot" locations that allows for consistent sampling and monitoring at biologically productive locations across a latitudinal gradient: DBO 1 (SLIP)-south of St. Lawrence Island (SLI), DBO2 (Chirikov)-north of SLI, DBO3 (southern Chukchi Sea), DBO4-NE (northeast) Chukchi Sea, and DBO5-Barrow Canyon. In addition to a suite of biophysical sampling, the DBO also includes seabird surveys and a marine mammal watch along the ship’s track whenever possible, to provide a means to detect responses of these upper-trophic level predators to changes in the Pacific Arctic marine ecosystem.
DOI: 10.18739/a2gb1xj91
title: eXpendable Conductivity Temperature Depth (XCTD) profiles of temperature and salinity from Sermilik Fjord during July and August 2019

description: Seven temperature and salinity profiles from Sermilik Fjord in Southeast Greenland. The profiles were collected using Sippican XCTD-1 eXpendable Conductivity Temperature Depth (XCTD) probes hand deployed from a helicopter (Profile #2 - 7). One profile was hand deployed from the M/V Adolf Jensen (Profile #1). The profiles were collected on July 31 and August 6 2019 in the plume, ice mélange, and main fjord branch regions of the Helheim Glacier and Sermilik Fjord system. The profiles were manually examined, quality controlled, and are provided as 2-meter (m) depth bin averaged profiles. The collection of these XCTD profiles was done concurrently with a shipboard survey of Sermilik Fjord from July 26 to August 1 2019. The shipboard CTD data are provided separately. These data were collected as part of a long-term project to monitor Sermilik Fjord to determine what water masses flow into and out of the fjord; in particular, if warm, Atlantic water from the Irminger Sea penetrates into the fjord and how freshwater from ice melt is diluted and transported out of the fjord. Observations have been collected in the fjord since 2008.
DOI: 10.18739/a2gh9bb73
title: Sediment Core Data from Cape Espenberg, Alaska, 2018-2022

description: The Arctic is experiencing warming and ecological shifts due to climate change and the compounded effects of polar amplification. Arctic Alaskan coastal marsh environments, such as the Cape Espenberg barrier beach system, offers an opportunity to determine the carbon cycle response to changing climate in sediment records that have been preserved through time as a shoreline-parallel, linear geometry prograding geomorphic features. This study determines the carbon and mineral accumulation trends in marsh environments at Cape Espenberg for both paleo (pre 1850 after death [AD]) and modern (post 1850 AD) timeframes. A comprehensive physical and chemical dataset, including radioisotope (Caesium-137 [137Cs], Lead-210 [210Pb], Carbon-14 [14C]), stable isotope (delta-13 Carbon [δ13C]), element concentration (%Carbon [C], %Nitrogen [N], C:N), and dry bulk density, has been built for several sediment cores. Results indicate carbon and mineral accumulations have increased from paleo to modern times, potentially due to better growing and/or preservation conditions for organic matter under a modern climate. Paleoclimate trends in the Medieval Climate Anomaly (MCA), and warm periods interspersed within the Little Ice Age (LIA), also correlate to greater contributions of wetland organic matter as evidenced by lighter δ13C values. Cold climate periods within the Little Ice Age correlate with increased aquatic organic matter sourcing and heavier δ13C values with some spikes of wetland sources interspersed throughout the LIA. Modern warming may potentially continue to expand carbon stores in Arctic coastal wetlands as future temperatures are predicted to rise with global climate change, as observed in the swale environments at Cape Espenberg, where increasingly favorable growing and soil preservation conditions (i.e. wet/anoxic soils and lower salinity to limit organic material decay, higher temperatures to promote growth) may result in future Arctic coastal carbon reservoirs.
DOI: 10.18739/a2gm81q8f
title: Buildings and roads detected from 0.5 meter resolution Maxar satellite imagery, Alaskan communities, 2018-2023

description: We created HABITAT (High-resolution Arctic Built Infrastructure and Terrain Analysis Tool), a deep learning-based, high-performance computing-enabled mapping pipeline to automatically detect buildings and roads from high-resolution Maxar satellite imagery in Arctic communities. The code is made available at https://github.com/PermafrostDiscoveryGateway/HABITAT.
 The pipeline is based on a ResNet50-UNet++ semantic segmentation architecture trained on a training dataset comprised of building and road footprint polygons manually digitized from Maxar satellite imagery across the circumpolar Arctic (including Alaska, Russia, and Canada).
 From imagery of 285 Alaskan communities acquired between 2018-2023, we detected approximately 250,000 buildings and storage tanks (comprising a 41.76 million square meter footprint) and 15 million meters of road. Building (including storage tanks) footprint polygons and road centerlines were strictly mapped within the boundaries of Alaskan communities (both incorporated places and census designated places). After the deep learning model detected building and road footprints, post-processing was performed to smooth out building footprints, extract centerlines from road footprints, and remove falsely-detected infrastructure. In particular, a buffer is created around developed land cover identified by the 2016 Alaska National Land Cover Database map, and model predictions that fall outside of the buffer are assumed to be confused with non-infrastructure land cover.
DOI: 10.18739/a2gm81q9x
title: Increasing wildfire frequency decreases carbon storage and leads to regeneration failure in boreal forests 2015-2023

description: Background: The increasing size, severity, and frequency of wildfires is one of the most rapid ways climate warming could alter the structure and function of high-latitude ecosystems. Historically, boreal forests in western North America had fire return intervals (FRI) of 70-130 years, but shortened FRIs are becoming increasingly common under extreme weather conditions. Here, we quantified pre-fire and post-fire C pools and C losses and assessed post-fire seedling regeneration in long (&gt;70 years), intermediate (30 -70 years), and short (&lt;30 years) FRIs, and triple (three fires in &lt;70 years) burns. As boreal forests store a significant portion of the global terrestrial carbon (C) pool, understanding the impacts of shortened FRIs on these ecosystems is critical for predicting the global C balance and feedbacks to climate.
 Results: Using a spatially extensive dataset of 555 plots from 31 separate fire scars in Interior Alaska, our study demonstrates that shortened FRIs decrease the C storage capacity of boreal forests through loss of legacy C and regeneration failure. Total wildfire C emissions were similar among FRI classes, ranging from 2.5 to 3.5 kilograms Carbon per square meter (kg C m-2). However, shortened FRIs lost proportionally more of their pre-fire C pools, resulting in substantially lower post-fire C pools than long FRIs. Shortened FRIs also resulted in the combustion of legacy C, defined as C that escaped combustion in one or more previous fires. We found that post-fire successional trajectories were impacted by FRI, with ~ 65% of short FRIs and triple burns experiencing regeneration failure.
 Conclusions: Our study highlights the structural and functional vulnerability of boreal forests to increasing fire frequency. Shortened FRIs and the combustion of legacy C can shift boreal ecosystems from a net C sink or neutral to a net C source to the atmosphere and increase the risk of transitions to non-forested states. These changes have profound implications for the boreal C-climate feedback and could accelerate climate warming. Our findings underscore the need for adaptive management strategies that prioritize the structural and functional resilience of boreal forest ecosystems to expected increases in fire frequency.
DOI: 10.18739/a2gq6r42w
title: Turbulence data from conductivity, temperature, and depth (CTD)-chipods on Arctic Observing Network cruise in 2020 (AON2020)

description: This is a turbulence dataset collected from conductivity, temperature, and depth (CTD)-chipods, a turbulence package mounted on the CTD rosette during an Arctic Observing Network cruise in 2020. The CTD stations spanned 149 casts around Alaska, USA along the northern and western shelves. Data are processed using a MATLAB software developed by the Ocean Mixing Group at Oregon State University to clean wake contamination and produce turbulence estimates. Data provided include the dissipation of temperature variance (chi) and the eddy diffusivity of temperature (Kt). Quantities are provided on a 2-meter (m) grid on the descent and ascent of the rosette. These turbulence data are meant to help diagnose and quantify heat exchanges between water masses in the subsurface and with the atmosphere.
DOI: 10.18739/a2gt5fh56
title: MERRA-2 tavg1_2d_lnd_Nx: 2d,1-Hourly,Time-Averaged,Single-Level,Assimilation,Land Surface Diagnostics V5.12.4, 1980-01-01 to present

description: The Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2) is a NASA atmospheric reanalysis for the satellite era using the Goddard Earth Observing System Model, Version 5 (GEOS-5) with its Atmospheric Data Assimilation System (ADAS), version 5.12.4. The MERRA project focuses on historical climate analyses for a broad range of weather and climate time scales and places the NASA EOS suite of observations in a climate context. 
 MERRA-2 was initiated as an intermediate project between the aging MERRA data and the next generation of Earth system analysis envisioned for the future coupled reanalysis. Without a substantial investment to update MERRA's data assimilation routines, the system lacked the capability to analyze the latest observations. In addition, numerous advances to the GEOS5 system had been implemented since freezing the MERRA system in 2008. Therefore, a new full reanalysis integration was undertaken. MERRA-2 covers the period 1980-present, continuing as an ongoing climate analysis as resources allow.
DOI: 10.7910/dvn/6oavpd
title: Simulation result of 1 million Supply Acquisition Rate combinations and Total Gross Profit earned

description: This repository contains datasets from a comprehensive simulation study focused on optimizing coffee procurement strategies across multiple Indonesian sourcing regions (Aceh, Lampung, West Java, North Sumatera, South Sulawesi, and NTT) under conditions of weather uncertainty. The data includes both aggregated results from a wide range of Supply Acquisition Rate (SAR) combinations, illustrating their impact on total gross profit, as well as detailed monthly breakdowns for the top-performing SAR scenarios. These detailed datasets provide in-depth insights into various key supply chain metrics, such as supply availability, demand fulfillment, costs, inventory levels, and service levels, to support informed decision-making in coffee supply chain management.
DOI: 10.18739/a2h12v91s
title: Fortymile caribou herd range isopleths, occurrence distributions, and associated vegetation change data, Alaska and Yukon Territory (1991 - 2021)

description: We assessed the range characteristics of the Fortymile migratory caribou (Rangifer tarandus) herd in east-central Alaska and west-central Yukon Territory as it grew (1992-2017) then declined (2017-2020) to analyze whether range size, location and density changed over this time period. In addition, we assessed the correlation between caribou density and vegetation change over this time period using remotely sensed estimates of plant functional type fractional cover.
 This dataset provides: a) the Fortymile range isopleth data used to assess changes in range characteristics, b) the Forytmile range occurrence distributions used to analyze spatial patterns in caribou relative spatial density, and c) summarized vegetation change data associated with caribou relative spatial density classes.
DOI: 10.18739/a2h41jp43
title: Tracing herbivore effects on litter decomposition in the Yukon-Kuskokwim River Delta 06/17/2022 - 06/16/2023

description: Herbivores alter abiotic characteristics in their habitats as well as litter quality, both characteristics which are known to change litter decomposition rates. In the Yukon-Kuskokwim (Y-K) River Delta, geese act as ecosystem engineers, altering vegetation and carbon cycling, but it is unknown how or if they affect litter decomposition rates. To determine potential impacts of herbivores on litter decomposition, we performed a field litter bag study in which we collected two different qualities of litter representing grazed and ungrazed conditions, and incubated them in grazed ‘grazing lawn’ and ungrazed ‘Carex meadow’ habitats in the Yukon Delta National Wildlife Refuge, a subarctic wetland ecosystem (Coordinates: 61.313439, -165.54306). We collected bags at 3, 6, 9, and 52 weeks (from 6/17/2022 - 6/16/2022), and measured the biomass loss. Abiotic conditions were monitored in each habitat to quantify potential environmental conditions affecting litter decomposition dynamics. We also measured carbon, nitrogen, and lignin concentrations at each timepoint to determine degradation of labile and recalcitrant materials.
DOI: 10.18739/a2h708289
title: Learning from the Permafrost & Infrastructure Symposium: A roadmap to resilience - Fairbanks, Alaska (2023)

description: This conference report from the 2023 Permafrost and Infrastructure Symposium summarizes the knowledge exchanged at this transdisciplinary conference and includes recommendations and practical insights for Northern communities responding to rapid Arctic warming. The conference took place in July/August 2023 in Utqiaġvik, Alaska, and along the Dalton and Elliot Highways from Prudhoe Bay to Fairbanks. It brought over 30 Arctic scientists, engineers, architects, and planners to Northern Alaska to see issues related to permafrost thaw and coastal erosion firsthand and to learn from those who live and work in the Arctic. They were joined in Utqiagvik by leaders from the North Slope Borough, regional housing and utility providers, and the Alaska Native villages of Wainwright and Point Lay for three days of presentations, discussions, and field trips. The goal of the Symposium was to help develop better strategies for improving Arctic infrastructure by pairing scientific and engineering research with local knowledge and priorities. “There is no substitute to being in a place like Point Lay. It is an efficient way to do away with a whole bunch of assumptions. There is never a better way to get more people on the same page faster, so we can move onto the next phase faster,” according to Griffin Hagle-Forster, executive director of the Association of Alaska Housing Authorities who served on the Symposium’s organizing committee. Following the conference in Utqiaġvik, 20 participants continued to Deadhorse, Alaska, to learn about strategies for building roads on permafrost from the Alaska Department of Transportation and Public Facilities and to view the results of tundra restoration efforts in Prudhoe Bay and along the Dalton Highway to Fairbanks. This report released summarizes the research and insights shared at the Symposium from over 30 presentations and breakout discussions. Recommendations include practical insights and opportunities for Arctic planners and policymakers and for scientists, engineers, and designers working with Northern communities. A companion proceedings portal at the Arctic Data Center provides an online archive of presentation slides and recordings, other meeting materials, and links to recommended readings.
DOI: 10.18739/a2h98zf87
title: eXpendable Conductivity Temperature Depth (XCTD) profiles of temperature and salinity from Sermilik Fjord, Southeast Greenland during September 2022

description: Ten temperature and salinity profiles from Sermilik Fjord in Southeast Greenland. The profiles were collected using Sippican XCTD-1 eXpendable Conductivity Temperature Depth (XCTD) probes hand deployed from a helicopter. The profiles were collected on September 11, 2022 in the ice mélange of Helheim Glacier and in the northern portion of Sermilik Fjord. The profiles were manually examined, quality controlled, and are provided as 2-meter (m) depth bin averaged profiles. These data were collected as part of a long-term project to monitor Sermilik Fjord to determine what water masses flow into and out of the fjord; in particular, if warm, Atlantic water from the Irminger Sea penetrates into the fjord and how freshwater from ice melt is diluted and transported out of the fjord. Observations have been collected in the fjord since 2008.
DOI: 10.18739/a2hh6c77b
title: Chemical, elemental, and isotopic measurements of the Tunu2022a and Tunu2022b ice core collected from northeastern Greenland; 2022-2024.

description: The original goal of the proposed research was to develop accurately dated, high-resolution, ice-core records of a broad range of elements and chemical species to expand and extend recently identified, causal linkages between (1) ancient societies; (2) volcanism and hydroclimate; and (3) wars, plagues, social unrest, and economic activity--while engaging ancient and pre-modern historians, economists, and students in consilient ice core research and interpretation. Underpinning these efforts was the proposed collection and analysis of a ~440 meter (m) ice core (Tunu2020 but delayed by COVID until 2022) from the northeastern flank of the Greenland ice sheet that was to be used to develop accurately dated, sub-annually resolved, multi-parameter records during the past 4k years of volcanism, heavy-metal pollution from ancient mining and smelting activities, as well as other indicators of climate and human activities. Because core quality and the drill penetration rate decreased very dramatically below ~165 m, however, two cores were collected instead of a single longer core. The Tunu2022a and Tunu2022b cores were located 50 m apart and about 5 kilometer (km) from the Tunu2013 core site.
DOI: 10.7910/dvn/eizusi
title: Aligning Cognition with Action in Digital Transformation: A Pathway to Enhancing a Firm’s AI Capability

description: To substantively advance digital transformation and cultivate AI capability (AIC) for enhanced competitive benefits derived from AI, this study—grounded in signaling theory—uses polynomial regression and response surface analysis on panel data from Chinese A-share listed firms (2013–2023) to investigate the relationship between digital transformation cognition (DTC) and digital transformation action (DTA) configurations and a firm’s AIC. The results demonstrate that DTC–DTA congruence yields a stronger positive effect on AIC relative to incongruent configuration. Moreover, high DTC–high DTA congruence drives significantly greater AIC enhancement than low DTC–low DTA congruence. In incongruent scenarios, high DTC–low DTA configuration exerts a more pronounced impact on AIC than low DTC–high DTA configuration, highlighting the pivotal leading role of strategic cognition. Mechanisms analysis reveals that information asymmetry serves as a mediating pathway, partially masking the impact of DTC–DTA congruence on AIC. Furthermore, under conditions of high equity balance or low policy pressure, the effect of such congruence is significantly amplified. These insights advance the understanding of cognition–action configurations in digital transformation while providing practical implications for firms to develop AI capability to address digital-era challenges.