cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a2cr5nc6r
title: Polaris Project 2017: Aquatic isotopes, carbon, and nitrogen, Yukon-Kuskokwim Delta, Alaska

description: This project is integrating scientific research in the Arctic with education and outreach, with a strong central focus on engaging undergraduate students and visiting faculty from groups that have had little involvement in Arctic science to date. The central element of the project is a month-long research expedition to the Yukon River Delta in Alaska. The expedition provides a deep intellectual and cultural immersion in the context of an authentic research experience that is paramount for "hooking" students and keeping them moving along the pipeline to careers as Arctic scientists. The overarching scientific issue that drives the research is the vulnerability and fate of ancient carbon stored in Arctic permafrost (permanently frozen ground). Widespread permafrost thaw is expected to occur this century, but large uncertainties remain in estimating the timing, magnitude, and form of carbon that will be released when thawed. Project participants are working in collaborative research groups to make fundamental scientific discoveries related to the vulnerability of permafrost carbon in the Yukon River Delta and the potential implications of permafrost thaw in this region for the global climate system. This data set includes aquatic results from the 2017 expedition, such as water temperature, pH, dissolved oxygen, conductivity, dissolved organic carbon, dissolved organic nitrogen, nitrate, ammonium, phosphate, dissolved methane, carbon dioxide, and nitrous oxide, water and carbon isotopes, and spectral slopes and specific UV absorbance from CDOM measurements. A subset of sample sites also have field fluxes of methane and carbon dioxide.
DOI: 10.5281/zenodo.3629718
title: ePSproc: DABCO, HOMO-1 ionization (orb 30, A2PP), 1 - 50eV

description: DABCO, HOMO-1 ionization (orb 30, A2PP), 1 - 50eV - photoionization calculations with ePolyScat (ePS) + ePSproc.<br><br>*Web version*: https://phockett.github.io/ePSdata/DABCO/DABCO_1-50.0eV_orb30_A2PP.html<br><br>For more details of the calculations, see readme.txt, or: About ePSdataAbout ePSprocAbout ePS
DOI: 10.5281/zenodo.3629719
title: ePSproc: DABCO, HOMO-1 ionization (orb 30, A2PP), 1 - 50eV

description: DABCO, HOMO-1 ionization (orb 30, A2PP), 1 - 50eV - photoionization calculations with ePolyScat (ePS) + ePSproc.<br><br>*Web version*: https://phockett.github.io/ePSdata/DABCO/DABCO_1-50.0eV_orb30_A2PP.html<br><br>For more details of the calculations, see readme.txt, or: About ePSdataAbout ePSprocAbout ePS
DOI: 10.5281/zenodo.3629720
title: ePSproc: DABCO, HOMO ionization (orb 31, A1P), 1 - 50eV

description: DABCO, HOMO ionization (orb 31, A1P), 1 - 50eV - photoionization calculations with ePolyScat (ePS) + ePSproc.<br><br>*Web version*: https://phockett.github.io/ePSdata/DABCO/DABCO_1-50.0eV_orb31_A1P.html<br><br>For more details of the calculations, see readme.txt, or: About ePSdataAbout ePSprocAbout ePS
DOI: 10.5281/zenodo.3629721
title: ePSproc: DABCO, HOMO ionization (orb 31, A1P), 1 - 50eV

description: DABCO, HOMO ionization (orb 31, A1P), 1 - 50eV - photoionization calculations with ePolyScat (ePS) + ePSproc.<br><br>*Web version*: https://phockett.github.io/ePSdata/DABCO/DABCO_1-50.0eV_orb31_A1P.html<br><br>For more details of the calculations, see readme.txt, or: About ePSdataAbout ePSprocAbout ePS
DOI: 10.18739/a2br8mg6h
title: Yukon-Kuskokwim Delta fire: aquatic data, Yukon-Kuskokwim Delta Alaska, 2015-2016

description: The summer of 2015 was an extraordinary year for fire in the Arctic, including in the Yukon-Kuskokwim Delta, presaging a future where tundra and boreal fire is far more common. Remarkably, the area burned in the YK Delta in 2015 exceeds the total area burned from 1940-2014 combined. The response of the YK Delta in the first year post-fire will set the stage for longer-term changes in delta carbon storage and transport among tundra, aquatic and marine systems, and to the atmosphere. Quantifying carbon export and understanding the immediate ecosystem response to fire is critical because long-term recovery is, to a considerable degree, dependent on short-term responses. A major question that this research will address is how fire influences the amount and form of carbon transported from delta ecosystems seasonally and in the first year following fire. Ultimately, these results will inform long-term trajectories of the vulnerability and fate of delta carbon pools. This research will significantly improve our understanding of the role of fire in the loss of both modern and ancient carbon from arctic river deltas, which contain &gt;10% of the Arctic’s massive permafrost carbon store. Arctic river deltas are hotspots for carbon storage, occupying &lt;1% of the pan-Arctic watershed but containing &gt;10% of carbon stored in arctic permafrost. They are also heterogeneous mosaics of linked terrestrial and aquatic ecosystems, and are susceptible to changes in land, river, and marine systems. The vulnerability of carbon stored in arctic river deltas is a major unknown and is critically important as climate warming and increasing fire frequency may make this carbon vulnerable to transport to aquatic and marine systems and to the atmosphere. The goal of this proposal is to examine the immediate effects of fire on carbon storage in the Yukon-Kuskokwim Delta and exchange between terrestrial and aquatic components of the Delta. By extension this work will yield critical insights into how the carbon balance of deltas in the arctic system will change over the coming decades as warming continues and fire frequency increases. This aquatic data set includes samples from soil pore water, small ponds and thaw features, streams, and lakes. The water samples were analyzed for DOC, TDN, Si, NO3, NH4, PO4, and CO2, CH4, and N2O. Measurements of slope ratio and SUVA were taken for a subset. Field measurements at the location where each sample was collected include temperature, pH, conductivity, DO, and CO2 and CH4 fluxes.
DOI: 10.18739/a2gh9b908
title: Yukon-Kuskokwim Delta fire: decomposition rates, Yukon-Kuskokwim Delta Alaska, 2016

description: The summer of 2015 was an extraordinary year for fire in the Arctic, including in the Yukon-Kuskokwim Delta, presaging a future where tundra and boreal fire is far more common. Remarkably, the area burned in the YK Delta in 2015 exceeds the total area burned from 1940-2014 combined. The response of the YK Delta in the first year post-fire will set the stage for longer-term changes in delta carbon storage and transport among tundra, aquatic and marine systems, and to the atmosphere. Quantifying carbon export and understanding the immediate ecosystem response to fire is critical because long-term recovery is, to a considerable degree, dependent on short-term responses. A major question that this research will address is how fire influences the amount and form of carbon transported from delta ecosystems seasonally and in the first year following fire. Ultimately, these results will inform long-term trajectories of the vulnerability and fate of delta carbon pools. This research will significantly improve our understanding of the role of fire in the loss of both modern and ancient carbon from arctic river deltas, which contain &gt;10% of the Arctic’s massive permafrost carbon store. Arctic river deltas are hotspots for carbon storage, occupying &lt;1% of the pan-Arctic watershed but containing &gt;10% of carbon stored in arctic permafrost. They are also heterogeneous mosaics of linked terrestrial and aquatic ecosystems, and are susceptible to changes in land, river, and marine systems. The vulnerability of carbon stored in arctic river deltas is a major unknown and is critically important as climate warming and increasing fire frequency may make this carbon vulnerable to transport to aquatic and marine systems and to the atmosphere. The goal of this proposal is to examine the immediate effects of fire on carbon storage in the Yukon-Kuskokwim Delta and exchange between terrestrial and aquatic components of the Delta. By extension this work will yield critical insights into how the carbon balance of deltas in the arctic system will change over the coming decades as warming continues and fire frequency increases. This dataset includes in situ soil decomposition rates from buried cellulose experiments.
DOI: 10.18739/a2m61bq2q
title: Yukon-Kuskokwim Delta fire: vegetation biomass, Yukon-Kuskokwim Delta Alaska, 2016

description: The summer of 2015 was an extraordinary year for fire in the Arctic, including in the Yukon-Kuskokwim Delta, presaging a future where tundra and boreal fire is far more common. Remarkably, the area burned in the YK Delta in 2015 exceeds the total area burned from 1940-2014 combined. The response of the YK Delta in the first year post-fire will set the stage for longer-term changes in delta carbon storage and transport among tundra, aquatic and marine systems, and to the atmosphere. Quantifying carbon export and understanding the immediate ecosystem response to fire is critical because long-term recovery is, to a considerable degree, dependent on short-term responses. A major question that this research will address is how fire influences the amount and form of carbon transported from delta ecosystems seasonally and in the first year following fire. Ultimately, these results will inform long-term trajectories of the vulnerability and fate of delta carbon pools. This research will significantly improve our understanding of the role of fire in the loss of both modern and ancient carbon from arctic river deltas, which contain &gt;10% of the Arctic’s massive permafrost carbon store. Arctic river deltas are hotspots for carbon storage, occupying &lt;1% of the pan-Arctic watershed but containing &gt;10% of carbon stored in arctic permafrost. They are also heterogeneous mosaics of linked terrestrial and aquatic ecosystems, and are susceptible to changes in land, river, and marine systems. The vulnerability of carbon stored in arctic river deltas is a major unknown and is critically important as climate warming and increasing fire frequency may make this carbon vulnerable to transport to aquatic and marine systems and to the atmosphere. The goal of this proposal is to examine the immediate effects of fire on carbon storage in the Yukon-Kuskokwim Delta and exchange between terrestrial and aquatic components of the Delta. By extension this work will yield critical insights into how the carbon balance of deltas in the arctic system will change over the coming decades as warming continues and fire frequency increases. This dataset includes vegetation harvested the summer 1 year after the fires. Vegetation was sorted to species or functional group, dried and weighed for biomass.
DOI: 10.18739/a2qz22h52
title: Polaris Project 2017: Vegetation biomass, carbon, and nitrogen, Yukon-Kuskokwim Delta, Alaska

description: This project is integrating scientific research in the Arctic with education and outreach, with a strong central focus on engaging undergraduate students and visiting faculty from groups that have had little involvement in Arctic science to date. The central element of the project is a month-long research expedition to the Yukon River Delta in Alaska. The expedition provides a deep intellectual and cultural immersion in the context of an authentic research experience that is paramount for "hooking" students and keeping them moving along the pipeline to careers as Arctic scientists. The overarching scientific issue that drives the research is the vulnerability and fate of ancient carbon stored in Arctic permafrost (permanently frozen ground). Widespread permafrost thaw is expected to occur this century, but large uncertainties remain in estimating the timing, magnitude, and form of carbon that will be released when thawed. Project participants are working in collaborative research groups to make fundamental scientific discoveries related to the vulnerability of permafrost carbon in the Yukon River Delta and the potential implications of permafrost thaw in this region for the global climate system. This data set includes vegetation biomass, %C, and %N results from the 2017 expedition.
DOI: 10.18739/a2vq2s98b
title: Polaris Project 2017: Lake sediment carbon and nitrogen, Yukon-Kuskokwim Delta, Alaska

description: This project is integrating scientific research in the Arctic with education and outreach, with a strong central focus on engaging undergraduate students and visiting faculty from groups that have had little involvement in Arctic science to date. The central element of the project is a month-long research expedition to the Yukon River Delta in Alaska. The expedition provides a deep intellectual and cultural immersion in the context of an authentic research experience that is paramount for "hooking" students and keeping them moving along the pipeline to careers as Arctic scientists. The overarching scientific issue that drives the research is the vulnerability and fate of ancient carbon stored in Arctic permafrost (permanently frozen ground). Widespread permafrost thaw is expected to occur this century, but large uncertainties remain in estimating the timing, magnitude, and form of carbon that will be released when thawed. Project participants are working in collaborative research groups to make fundamental scientific discoveries related to the vulnerability of permafrost carbon in the Yukon River Delta and the potential implications of permafrost thaw in this region for the global climate system. This data set includes lake sediment sections, analyzed for %C, and %N from the 2017 expedition.
DOI: 10.6073/pasta/b2a4e83e5d1b9f902d8ed48793a26c0c
title: Harvard Forest Snow Pillow since 2009

description: Water storage in snowpack is a key factor in the hydrological cycle of central New England. The Harvard Forest Snow Pillow provides continuous long-term measurements of the water content of snowpack (snow water equivalent) during the winter months. The snow pillow is located in a mature mixed hardwood stand with scattered conifers about 50 m north of the Nelson Brook Big Weir. For current data, please see: http://harvardforest.fas.harvard.edu/meteorological-hydrological-stations. For a complete set of archived data, please see: http://harvardforest.fas.harvard.edu:8080/exist/xquery/data.xq?id=hf155.
DOI: 10.18739/a23775v7t
title: Polaris Project 2017: Aquatic isotopes, carbon, and nitrogen, Yukon-Kuskokwim Delta, Alaska

description: This project is integrating scientific research in the Arctic with education and outreach, with a strong central focus on engaging undergraduate students and visiting faculty from groups that have had little involvement in Arctic science to date. The central element of the project is a month-long research expedition to the Yukon River Delta in Alaska. The expedition provides a deep intellectual and cultural immersion in the context of an authentic research experience that is paramount for "hooking" students and keeping them moving along the pipeline to careers as Arctic scientists. The overarching scientific issue that drives the research is the vulnerability and fate of ancient carbon stored in Arctic permafrost (permanently frozen ground). Widespread permafrost thaw is expected to occur this century, but large uncertainties remain in estimating the timing, magnitude, and form of carbon that will be released when thawed. Project participants are working in collaborative research groups to make fundamental scientific discoveries related to the vulnerability of permafrost carbon in the Yukon River Delta and the potential implications of permafrost thaw in this region for the global climate system. This data set includes aquatic results from the 2017 expedition, such as water temperature, pH, dissolved oxygen, conductivity, dissolved organic carbon, dissolved organic nitrogen, nitrate, ammonium, phosphate, dissolved methane, carbon dioxide, and nitrous oxide, water and carbon isotopes, and spectral slopes and specific UV absorbance from CDOM measurements. A subset of sample sites also have field fluxes of methane and carbon dioxide.
DOI: 10.18739/a2k931656
title: Polaris Project 2017: Lake sediment carbon and nitrogen, Yukon-Kuskokwim Delta, Alaska

description: This project is integrating scientific research in the Arctic with education and outreach, with a strong central focus on engaging undergraduate students and visiting faculty from groups that have had little involvement in Arctic science to date. The central element of the project is a month-long research expedition to the Yukon River Delta in Alaska. The expedition provides a deep intellectual and cultural immersion in the context of an authentic research experience that is paramount for "hooking" students and keeping them moving along the pipeline to careers as Arctic scientists. The overarching scientific issue that drives the research is the vulnerability and fate of ancient carbon stored in Arctic permafrost (permanently frozen ground). Widespread permafrost thaw is expected to occur this century, but large uncertainties remain in estimating the timing, magnitude, and form of carbon that will be released when thawed. Project participants are working in collaborative research groups to make fundamental scientific discoveries related to the vulnerability of permafrost carbon in the Yukon River Delta and the potential implications of permafrost thaw in this region for the global climate system. This data set includes lake sediment sections, analyzed for %C, and %N from the 2017 expedition.
DOI: 10.18739/a2tq5rd9k
title: Yukon-Kuskokwim Delta fire: soil and permafrost carbon, nitrogen, horizons, and ice structure, Alaska, 2016

description: The summer of 2015 was an extraordinary year for fire in the Arctic, including in the Yukon-Kuskokwim Delta, presaging a future where tundra and boreal fire is far more common. Remarkably, the area burned in the YK Delta in 2015 exceeds the total area burned from 1940-2014 combined. The response of the YK Delta in the first year post-fire will set the stage for longer-term changes in delta carbon storage and transport among tundra, aquatic and marine systems, and to the atmosphere. Quantifying carbon export and understanding the immediate ecosystem response to fire is critical because long-term recovery is, to a considerable degree, dependent on short-term responses. A major question that this research will address is how fire influences the amount and form of carbon transported from delta ecosystems seasonally and in the first year following fire. Ultimately, these results will inform long-term trajectories of the vulnerability and fate of delta carbon pools. This research will significantly improve our understanding of the role of fire in the loss of both modern and ancient carbon from arctic river deltas, which contain &gt;10% of the Arctic's massive permafrost carbon store. Arctic river deltas are hotspots for carbon storage, occupying &lt;1% of the pan-Arctic watershed but containing &gt;10% of carbon stored in arctic permafrost. They are also heterogeneous mosaics of linked terrestrial and aquatic ecosystems, and are susceptible to changes in land, river, and marine systems. The vulnerability of carbon stored in arctic river deltas is a major unknown and is critically important as climate warming and increasing fire frequency may make this carbon vulnerable to transport to aquatic and marine systems and to the atmosphere. The goal of this proposal is to examine the immediate effects of fire on carbon storage in the Yukon-Kuskokwim Delta and exchange between terrestrial and aquatic components of the Delta. By extension this work will yield critical insights into how the carbon balance of deltas in the arctic system will change over the coming decades as warming continues and fire frequency increases. This dataset includes soils and permafrost collected during the summer 1 year after the fires. Soil and permafrost horizons are described, and measured for bulk density, soil moisture, volumetric ice content, pH, soil organic matter content, extractable nitrogen and carbon content, and cryo-structures are described,
DOI: 10.18739/a2zg6g72v
title: Polaris Project 2017: Permafrost carbon and nitrogen, Yukon-Kuskokwim Delta, Alaska

description: This project is integrating scientific research in the Arctic with education and outreach, with a strong central focus on engaging undergraduate students and visiting faculty from groups that have had little involvement in Arctic science to date. The central element of the project is a month-long research expedition to the Yukon River Delta in Alaska. The expedition provides a deep intellectual and cultural immersion in the context of an authentic research experience that is paramount for "hooking" students and keeping them moving along the pipeline to careers as Arctic scientists. The overarching scientific issue that drives the research is the vulnerability and fate of ancient carbon stored in Arctic permafrost (permanently frozen ground). Widespread permafrost thaw is expected to occur this century, but large uncertainties remain in estimating the timing, magnitude, and form of carbon that will be released when thawed. Project participants are working in collaborative research groups to make fundamental scientific discoveries related to the vulnerability of permafrost carbon in the Yukon River Delta and the potential implications of permafrost thaw in this region for the global climate system. This data set includes permafrost cores, with ammonium, nitrate, volumetric ice content, N mineralization rates, %C, and %N results from the 2017 expedition.