cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17592/001.2021052501
title: Stable isotope, ion concentrations, and mineral dust data from northwestern Greenland ice core (SIGMA-D)

description: The concentration of dust was measured from 1915 to 2003 using a CFA system. The size bins cover the range from 1.5 to 15.0 micro m. The morphology and composition of mineral dust was obtained for every 5-year interval from 1915 to 2013 using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDS). In total, 150 particles were randomly chosen from each sample.
DOI: 10.17592/001.2022022101
title: ADCP velocity data during leg 5 of MOSAiC expedition with R/V Polarstern

description: Near-surface ocean current (u, v, w) taken by 400kHz AquaDopp profiler Nortek during leg 5 of MOSAiC expedition near North Pole of the Arctic Ocean. Unit of current is m/s.
DOI: 10.17592/001.2021031801
title: Microparticles in a deep ice core drilled at NEEM, Greenland: cryogenic scanning electron microscopic observations of location, size, shape, and constituent elements

description: This report presents the analysis of microparticles contained in the deep ice core drilled at the North Greenland Eemian Ice Drilling (NEEM) site, using a cryogenic scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDS). By implementing additional optical microscopic analysis prior to cryogenic SEM/EDS analysis, it was possible to exclude microparticles formed during the cryogenic SEM/EDS experiments. The examined ice core samples were cut from depths corresponding to five different climate stages, from the Holocene period through the last interglacial epoch. Overall, 514 microparticles were observed via SEM, and 151 of those were also analyzed based on their EDS spectra to determine their chemical compositions. A catalog containing the details of all the observed microparticles was then constructed. The catalog presents optical and secondary electron images of microparticles, an area-equivalent diameter and aspect ratio of each microparticle, and its distance from the nearest grain boundary and air-inclusion (e.g., air bubble, hydrate, or plate-like inclusion). For microparticles analyzed with EDS, numerical data regarding the X-ray count, weight ratio, and atomic ratio are also included, and the atomic ratio is shown as a pie chart. In this report, we describe how the observations and analyses were carried out and how the catalog data were organized. The catalog is valuable for studies regarding the general paleoenvironment and the relationship between microparticles and the physical properties of ice-sheet ice.
DOI: 10.17592/001.2021091701
title: Blueprint of radiation shield for the iMet-XQ2 meteorological sensor

description: A radiation shield for the meteorological sensor (iMet-XQ2, International Met Systems, Inc.) was developed to reduce the effects from heat exhaust from both the rotors and the body of a drone and from solar radiation. The temperature probe within the shield was confirmed as well ventilated by simulation and laboratory experiment. The effect of a heat-reflecting coating, which needs to spray on the shield, was also validated in field experiments under mostly clear sky conditions at around noon in Kitami (Hokkaido, Japan). The shield would help avoid the deposition of precipitation on the temperature and humidity sensors. The STL file is available for 3D printing.
DOI: 10.17592/001.2021012801
title: Sea-ice motion and oceanographic data from the Beaufort Sea to the Chukchi Borderland in March - December, 2020

description: Sea-ice reduction is one of the most visible indicators of the Arctic warming. While there are many observations in the interior of the Arctic Ocean, oceanographic and sea-ice trajectory observations near the edge of sea-ice extent are rare. Here, we present oceanographic observations beneath sea ice obtained by an ice-tethered buoy and surrounding sea-ice motions obtained from 9 GPS buoys in the late ice-growth and sea-ice melt season along trajectories from the Beaufort Sea to the Chukchi Borderland in the Pacific sector of the Arctic Ocean.
DOI: 10.17592/001.2020122201
title: Part of variables from GCM experiments on the last interglacial using MIROC4m and MIROC4m-LPJ

description: This data is used in the paper O'ishi, R., Chan, W.-L., Abe-Ouchi, A., Sherriff-Tadano, S., Ohgaito, R. and Yoshimori, M.: PMIP4/CMIP6 Last Interglacial simulations using three different versions of MIROC: importance of vegetation, Clim. Past, in press, 2020. (1) insolation difference between 127ka and pre-industrial. (2) vegetaion distribution used in Figure 2. (3) Temperature, precipitation and sea-ice in 127ka and pre-industrial obtained from MIROC4m and MIROC4m-LPJ. (4) result of feedback analysis for Figure 16. All data are monthly climatlogy.
DOI: 10.17592/001.2019122705
title: Behavioral and ecological data on seabirds in St. Lawrence Island, 2019

description: Behavioral and ecological data of seabirds obtained at breeding colonies in St. Lawrence Island, in the summer of 2019.
DOI: 10.17592/001.2019122703
title: Behavioral and ecological data on seabirds in St. Lawrence Island, 2017

description: Behavioral and ecological data of seabirds obtained at breeding colonies in St. Lawrence Island, in the summer of 2017.
DOI: 10.17592/001.2019122704
title: Behavioral and ecological data on seabirds in St. Lawrence Island, 2018

description: Behavioral and ecological data of seabirds obtained at breeding colonies in St. Lawrence Island, in the summer of 2018.
DOI: 10.17592/001.2019122702
title: Behavioral and ecological data on seabirds in St. Lawrence Island, 2016

description: Behavioral and ecological data of seabirds obtained at breeding colonies in St. Lawrence Island, in the summer of 2016.
DOI: 10.17592/001.2022052401
title: Data associated with foraging behavior of Northern Elephant Seals (2015-2018)

description: Information about foraging behavior recorded by animal-borne electronic tags on Northern elephant seals.
DOI: 10.17592/001.2021040701
title: Chlorophyll a and macronutrient concentrations during the icebreaker Shirase cruise of the 61st Japanese Antarctic Research Expedition

description: Chlorophyll a concentration is the most common indicator of phytoplankton biomass, basically regulated by physicochemical properties such as temperature, salinity, macronutrients and light intensity. As part of the monitoring programs of the Japanese Antarctic Research Expedition (JARE), water temperature, salinity, chlorophyll a concentration, and macronutrients (nitrate, nitrite, phosphate, and silicic acid) have been measured since 1965. This report presents the latest data collected during the Shirase cruise in the 2019-2020 season.
DOI: 10.17592/001.2022020101
title: Dome Fuji, Antarctica Core DF01 7.88-13.36m, Sulfur isotope ratios delta34S and ion (chloride, methanesulfsulfonic acid, sulfate, Na+, K+, Mg2+ and Ca2+) concentrations

description: Sulfur isotopic (delta34S) analysis were performed for shallow ice core DF01 from Dome Fuji, Antarctica, including a chronological profile with annual resolution for the entire 19th century. This profile, which is directly comparable to the chronological concentration profiles of sulfate and other ions, is an important proxy for examining variations in the origin of sulfur related to climate changes.In the delta 34S and non-sea-salt (nss)-sulfate ((SO42-)nss) profiles, the signals of five well-known 19th century volcanic eruptions were confirmed: Krakatau 1883 (and Tarawera 1886), Makian 1861, Cosiguina 1835, Tambora 1815, and Unknown 1809. The averages of nss-sulfur-isotope composition (delta 34Snss) and (SO42-)nss for the second half, calculated after excluding these prominent signals, were found to differ from those for the first half century. We also examined singularities other than the five major volcanic signals in the delta 34S and (SO42-)nss profiles based on not only variations in delta 34S and (SO42-)nss but also variations in the concentrations of other ions. We then identified the presence of three additional volcanic signals: Babuyan 1831, Galunggung 1822, and an unknown volcanic eruption around 1807. The latter two signals confirmed for the first time in Antarctic ice cores. Other singularities may be related to an influx of coastal air masses, a non-stratospheric volcanic eruption near Antarctica, or an increase in the relative contribution of a stratospheric component to the precipitation in inland Antarctica.
DOI: 10.17592/002.2022040392
title: Antarctic surface air Beryllium-7 (Period-1:2014-2017)
DOI: 10.17592/001.2021040702
title: Chlorophyll a, macronutrient concentrations, and photosynthetically active radiation measured during the Umitaka-maru cruise of the 61st Japanese Antarctic Research Expedition, January 2020

description: The chlorophyll a concentration is the most commonly used indicator of phytoplankton biomass, which is regulated by macronutrients and light intensity. Long-term monitoring of chlorophyll a provides basic information on the ecosystem changes associated with climate change. As part of the monitoring program of the Japanese Antarctic Research Expedition (JARE), the chlorophyll a concentration and macronutrients (nitrate, nitrite, phosphate and silicic acid) have been measured by the icebreakers Fuji and Shirase since JARE-14 (1972/73) and JARE-7 (1965/66), respectively, and during the cruise of the training vessel (T/V) Umitaka-maru, of Tokyo University of Marine Science and Technology, since JARE-55 (2013/14). The Umitaka-maru follows almost the same course every year; after leaving Fremantle, it travels to the sea ice edge (ca. 65S) along the 110E meridian and then returns to Hobart. Its course covers waters in the Southern Ocean that range from sub-tropical to polar. During the cruise, water samples for determining chlorophyll a and macronutrient concentrations are obtained from an underway pump twice a day, and photosynthetically active radiation is measured continuously by a sensor mounted on the bridge of the ship. Vertical water sampling to determine the chlorophyll a concentration is conducted at six stations along the 110E meridian, and the macronutrient concentrations at the same stations are determined by another monitoring program. This report includes the latest data collected during the T/V Umitaka-maru cruise in the 2019/20 season. In 2019/20, three vertical sampling stations (KC7-9) were added to enhance the bottom water monitoring performed under the "Physical and Chemical Oceanography" routine observation program of the JARE.
DOI: 10.17592/001.2022030401
title: Sinking flux of lithogenic material simulated by the pan-Arctic sea ice-ocean model

description: Sinking flux of lithogenic material simulated by the pan-Arctic sea ice-ocean model COCO is summarized. This dataset presents the flux at 200m in four mooring areas: North of Barrow Canyon (NBC), North of Hanna Canyon (NHC), Northwind Abyssal Plain (NAP), and Chukchi Abyssal Plain (CAP). The seasonal average values for September-November (SON), December-February (DJF), March-May (MAM), and June-August (JJA) for 2010-2020 are listed. This work was supported by the Arctic Challenge for Sustainability (ArCS) project phase I-II.
DOI: 10.17592/001.2020070705
title: Chlorophyll a and macro-nutrients concentrations during the ice breaker Shirase cruise of the 60th Japanese Antarctic Research Expedition

description: Chlorophyll a concentration is the most common indicator of phytoplankton biomass, basically regulated by macro-nutrients and light intensity. Therefore, long term monitoring of these parameters gives us fundamental information on ecosystem changes with climate changes. As part of the monitoring programs of the Japanese Antarctic Research Expedition (JARE), chlorophyll a concentration and macro-nutrients (nitrate, nitrite, phosphate and silicate) have been measured on board icebreakers Fuji and Shirase from JARE-14 in the 1972/73 season and from JARE-7 in the 1965/66 season, respectively. This report is the latest data determined during the Shirase cruise in 2018/19 season.
DOI: 10.17592/001.2020122501
title: Oceanographic data beneath the Langhovde Glacier ice shelf, East Antarctica

description: This is the oceanographic data obtained beneath the Langhovde Glacier ice shelf in the fieldwork between December 2017 and January 2018. The datasets include subshelf water temperature, salinity and water current.
DOI: 10.17592/001.2020112701
title: Ground temperature data from an ice-free area at mid-range of Yukidori Zawa, Langhovde, East Antarctica during January 2010 - January 2012

description: Ground (soil) temperature data recorded by temperature data recorders buried in 1 cm and 10 cm depths of the ground surface at mid range of Yukidori Zawa during the JARE-51 and 53 (2010-2012) was summarized in a table. Almost 2-year data of the ground temperature at two discrete depths were compiled in a text file from each recorder at 1-hr interval. Using the present data with air temperature and solar radiation data from neighborhood automatic weather station reported previously, timing and period of soil thawing were graphically shown.
DOI: 10.17592/001.2015093001
title: The GRENE-TEA Model Intercomparison Project (GTMIP) stage 1 forcing dataset

description: Here, the authors describe the construction of a forcing dataset for Land Surface Models (including both physical and biogeochemical models; LSMs) with eight meteorological variables for the 35 year period from 1979 to 2013. The dataset is intended for use in a model intercomparison (MIP) study, called GTMIP, which is a part of the Japanese-funded Arctic Climate Change research project. In order to prepare a set of site-fitted forcing data for LSMs with realistic yet continuous entries (i.e. without missing data), four observational sites across the pan-Arctic region (Fairbanks, Tiksi, Yakutsk, and Kevo) were selected to construct a blended dataset using both global reanalysis and observational data. Marked improvements were found in the diurnal cycles of surface air temperature and humidity, wind speed, and precipitation. The datasets and participation in GTMIP are open to the scientific community (https://ads.nipr.ac.jp/gtmip/gtmip.html). This data includes four data sets below. *L0 data: 34-year, reanalysis-based (ERA-Interim), 30-min data *L1 data: L0 data merged with the GRENE-TEA site observations *Detrended data: 20-year detrended driving data for spin up based on L1 (1980-1999) *FPAR/LAI data: MODIS based monthly data at GRENE-TEA site (2001-2011; monthly)
DOI: 10.17592/001.2018060801
title: Zooplankton monitoring by a twin NORPAC net during the 58th Japanese Antarctic Research Expedition in austral summer 2016-2017

description: As part of the monitoring program of the Japanese Antarctic Research Expedition (JARE), zooplankton samplings by a NORPAC (North Pacific) standard net have been routinely carried out from JARE-14 in the 1972/73 season to estimate the mean biomass of zooplankton and time/space variation in the uppermost 150 m of the Indian Ocean sector of the Southern Ocean. Two separate monitoring surveys were completed during the JARE-58 (December 2016 to March 2017). The icebreaker Shirase has a fixed time schedule and route down 110E longitude each December and return leg along 150E longitude in March. These routine schedule of Shirase is ideal as a long-term temporal reference for monitoring work. T/V Umitakam-maru transects were also along 110E longitude in January. This report are the latest data of long-term zooplankton monitoring continued by JARE over 40 years, and can be used as time series and/or seasonal data of monitoring transects.
DOI: 10.17592/001.2017111001
title: Seasonal progression of the deposition of black carbon by snowfall at Ny-Alesund, Spitsbergen.

description: Wet and dry deposition of black carbon (BC) aerosol in the Arctic lowers snow albedo, thus contributing to warming in the Arctic. However, the processes and impacts associated with BC deposition in the Arctic are poorly understood because of the scarcity and uncertainties of measurements of BC in snow with adequate spatiotemporal resolution. We sampled snowpack at two sites (11 m and 300 m above sea level) at Ny-Alesund, Spitsbergen, in April 2013. We also collected falling snow near the surface with a windsock from September 2012 to April 2013. The size distribution of BC in snowpack and falling snow was measured using a single-particle soot photometer combined with a nebulizer. The BC size distributions did not show significant variations with depth in the snowpack, suggesting stable size distributions in falling snow. The BC number and mass concentrations (CNBC and CMBC) at these sites agreed to within 19% and 10%, respectively, despite the sites difference in snow water equivalent (SWE). This indicates the small influence of the amount of SWE (or precipitation) on these quantities. Average CNBC and CMBC in snowpack and falling snow at nearly the same locations agreed to within 5% and 16%, after small corrections for artifacts associated with the sampling of the falling snow. This comparison shows that the relative contribution of dry deposition to total deposition to be smaller than the uncertainty of their measurements. CNBC and CMBC in falling snow and BC concentrations in ambient air were highest in winter.
DOI: 10.17592/001.2018020101
title: Spectral reflectance and associated photograph of boreal forest understory formation in interior Alaska

description: The Arctic and boreal regions have been experiencing a rapid warming in the 21st century. It is important to understand the dynamics of boreal forest at the continental scale under the climate and environmental changes. While the role of understory vegetation in boreal forest ecosystems on carbon and nutrient cycling cannot be ignored, they are still one of least understood components in boreal ecosystems. Spectroscopic measurements of vegetation are useful to identify species and their biochemical characteristics and to estimate the biophysical parameters such as understory leaf area index, above ground biomass. In this data paper, we present spectral reflectances of 44 typical understory formations and five 30-m long transects. The spectral reflectance covers the spectral region of visible, near infrared and shortwave infrared (350-2500 nm). For the transect measurements, we decided the length of transect at 30 m, similar to the scale of one pixel of a Landsat type satellite imagery. The photographs at all positions, where spectral reflectances were obtained, are included to understand the structure and status of each sample. The data set contains six dwarf shrubs (Bog bilberry (Vaccinium uliginosum), cranberry (Vaccinium vitis-idea), feltleaf willow (Salix alaxensis), young birch (Betula neoalaskana), young aspen (Pupulus tremuloides), and young black spruce (Picea mariana)), two herbaceous (cottongrass (Eriophorum vaginatum) and marsh Labrador tea (Ledum decumbens)), three mosses (Sphagnum moss, splendid feather moss (Hylocomium splendens), and polytrichum moss (Polytrichum commune)), and reindeer lichen (Cladonia rangiferina). Spectral reflectances from several non-vegetative such as snow, litter, and soil are also included. This spectral and photographic data set can be used for understanding the spectral characteristics of understory formations, designing newly planned spectral observations, and developing and validating the remote sensing methodology of large scale understory monitoring.
DOI: 10.17592/001.2017060801
title: Surface elevations on Qaanaaq and Bowdoin Glaciers in northwestern Greenland as measured by a kinematic GPS survey from 2012-2016

description: Kinematic GPS measurements provide in-situ data crucial for measuring the surface elevation change of glaciers. Owing to their accuracy, which is generally better than half meter, surface elevations derived from kinematic GPS surveys are useful and essential for generating precise digital elevation models (DEMs) and evaluating geometry changes of glaciers. We present a surface elevation data set derived from kinematic GPS measurements covering the lower 5 km of Qaanaaq and Bowdoin Glaciers in northwestern Greenland. The data includes elevations over ice-free terrain nearby the glaciers, important for calibrating remote sensing data. More than 600,000 GPS survey data points were processed to produce a 1-m resolution mesh grid of elevation data in a CSV file format. Based on our error analysis, the accuracies of the elevation data are better than 0.2 and 0.3 m in horizontal and vertical directions, respectively. This dataset can be utilized to investigate glacier surface elevation changes by comparing it making comparison with DEMs that may be obtained in the past, and from future from remote sensing and in-situ observations.
DOI: 10.17592/001.2021043001
title: Dome Fuji ice core gas data (112 - 2001m, 15N, O2/N2, Ar/N2)

description: The variations of O2/N2 and Ar/N2 in the Dome Fuji ice core were measured from 112 m (bubbly ice) to 2001 m (clathrate hydrate ice) at high precision. Our method, combined with low storage temperature (-50 degreeC) successfully remove post-coring gas-loss fractionation signals from our data. From bubbly ice to the middle of bubble-clathrate transition zone (BCTZ) (112 - 800 m) and below the BCTZ (&gt;1200 m), the O2/N2 and Ar/N2 data exhibit orbital-scale variations similar to local summer insolation. The data in the lower BCTZ (800 - 1200 m) have large scatters, which may be caused by mm-scale inhomogeneity of air composition combined with finite sample lengths. In the clathrate hydrate zone, the scatters around the orbital-scale variability decrease with depth, indicating diffusive smoothing of O2/N2 and Ar/N2. A simple gas diffusion model was used to reproduce the smoothing and thus constrain permeation coefficients of the gases. Relationship between Ar/N2 and O2/N2 is markedly different for the datasets representing bubble close-off (slope ~0.5), diffusion within the ice sheet (~1), and post-coring gas-loss (~0.2), suggesting that the dominant fractionation processes are different for those cases. The method and data presented here may be useful for improving the orbital dating of deep ice cores over the multiple glacial cycles and further studying non-insolation-driven signals (e.g., atmospheric composition) of these gases.
DOI: 10.17592/001.2021120702
title: Biogeochemical data during the Multidisciplinary ecosystem survey in the eastern Indian sector of the Antarctic with a focus on Antarctic krill by R/V Kaiyo-maru in 2018/19

description: Hydrographic and biogeochemical data during the Multidisciplinary ecosystem survey in the eastern Indian sector of the Antarctic with a focus on Antarctic krill by R/V Kaiyo-maru in 2018/19.
DOI: 10.17592/001.2021120701
title: pCO2 data during the Multidisciplinary ecosystem survey in the eastern Indian sector of the Antarctic with a focus on Antarctic krill by R/V Kaiyo-maru in 2018/19

description: Hydrographic and biogeochemical data during the Multidisciplinary ecosystem survey in the eastern Indian sector of the Antarctic with a focus on Antarctic krill by R/V Kaiyo-maru in 2018/19.
DOI: 10.17592/001.2021110910
title: Ice thickness around Dome Fuji, Antarctica, based on JARE ground-based radar surveys: JARE60 data

description: This dataset contains the ice thickness data recorded in the Dome Fuji region, East Antarctica. The data was recorded by the 60th Japanese Antarctic Research Expedition (JARE60) using a pulse-modulated VHF radar sounder with a peak transmission power of 1kW, a center frequency of 179 MHz and a transmitter pulse width of 250 or 60 ns.