cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.973143
title: N2O concentrations measured on water bottle samples during Akademik Tryoshnikov cruise Arctic Century 2021 Expedition (AT21), Arctic Ocean

description: Sea water samples were collected as part of the Arctic Century Expedition, which took place in the Kara Sea (Arctic Ocean) aboard the research vessel Akademik Tryoshnikov between August and September 2021. A total of 27 stations were sampled for full-depth profile measurements of nitrous oxide (N₂O). N₂O samples were collected from the Niskin bottles using a Tygon® tube and transferred into borosilicate 60 ml serum bottles. Samples were poisoned by introducing 60 μL saturated mercury chloride (HgCl₂) solution. The bottles were sealed with isobutyl stoppers and capped with aluminium crimps. The bottles were kept in dark at room temperature until analysis at home laboratory. Measurements of N₂O concentration were conducted using the headspace technique described by Weiss (1981) and Upstill-Goddard et al. (1996). Briefly, approximately 25 mL of the sea water sample was replaced by ultra-pure N gas (AirLiquide Belgium®, Alphagaz 2, N₂ ≥ 99.9999%), followed by manual agitation and overnight equilibration in a water bath at room temperature. A 12 mL extraction from the headspace was injected into an SRI Instrument Model 8610C Gas Chromatograph with Electron Capture Detector (ECD), for analysis. The calibration was performed using precision gas mixtures containing N₂O, CH₄, CO₂, and N₂, provided by AirLiquide Belgium®. Temperature and salinity data from water bottle samples were provided by the Gangnus et al. (2022) dataset (doi:10.1594/PANGAEA.947808). The data are provided by the Arctic Century Expedition, a joint initiative led by the Swiss Polar Institute (SPI), the Antarctic and Arctic Research Institute (AARI) and GEOMAR Helmholtz Centre for Ocean Research Kiel (GEOMAR) and funded by the Swiss Polar Foundation, AARI, Minobrnauki (CATS RFMEFI61619X0108) and BMBF (CATS 03F0831).
DOI: 10.1594/pangaea.964288
title: Chironomid counts and loss-on-ignition for a 33cm long gravity core from lake Lontjørnane, Norway

description: This dataset provides chironomid count data and loss-on-ignition measurements for a short sediment record from lake Lontjørnane, located in the Røldal region, Norway. The core spans 33cm and dates from ca 1175 CE to the present. We obtained a sediment core from the centre of the lake (8.8 m water depth) using a HON/Kajak gravity corer during fieldwork in September 2019, and subdivided the core into 1-cm-thick samples in the field. Samples were transported to the laboratory (Birkbeck University of London, UK), where they were weighted and processed using standard protocols – this involved 20 min treatment with warm KOH (10 %) and sieving over a 100 µm mesh. Chironomid head capsules were subsequently handpicked from the residue, mounted on permanent microscope slides, and identified using Brooks et al. (2007). This dataset provides chironomid count data in number of chironomid head capsules per sample. Additionally, loss-on-ignition was determined for each sample by comparing the dry weight of the sample before and after combustion at 550 °C following Heiri et al. (2001). The chironomid dataset provides insight in centennial-scale changes in the insect community of the lake ecosystem under past climate change and current anthropogenic impact.
DOI: 10.1594/pangaea.964296
title: Chironomid counts and loss-on-ignition for a 28cm long gravity core from lake Støylsvatnet, Norway

description: This dataset provides chironomid count data and loss-on-ignition measurements for a short sediment record from lake Støylsvatnet, located in the Førde region, Norway. The core spans 28 cm and dates from ca 940 CE to the present. We obtained a sediment core from the centre of the lake (8.3 m water depth) using a HON/Kajak gravity corer during fieldwork in September 2019, and subdivided the core into 1-cm-thick samples in the field. Samples were transported to the laboratory (Birkbeck University of London, UK), where they were weighted and processed using standard protocols – this involved 20 min treatment with warm KOH (10 %) and sieving over a 100 µm mesh. Chironomid head capsules were subsequently handpicked from the residue, mounted on permanent microscope slides, and identified using Brooks et al. (2007). This dataset provides chironomid count data in number of chironomid head capsules per sample. Additionally, loss-on-ignition was determined for each sample by comparing the dry weight of the sample before and after combustion at 550°C following Heiri et al. (2001). The chironomid dataset provides insight in centennial-scale changes in the insect community of the lake ecosystem under past climate change and current anthropogenic impact.
DOI: 10.1594/pangaea.962521
title: Spatial and temporal abundance and size trends in scyphozoan jellyfish in coastal Icelandic waters in 2008

description: Scyphozoan jellyfish in Icelandic waters have received limited attention, despite apparent recent increases in jellyfish blooms and considerable regional oceanographic and climatic changes. We studied the species composition, abundance, phenology, and growth of scyphomedusae around the island and explored changes in distribution, species composition, and seasonality by comparing our findings with reports from the 1930s. Scyphomedusae were collected with a Bongo net (60 cm ring diameter, 250 cm net length, and 500 µm mesh size) in the top 10 m of the water column in five regions (fjords between 64 and 66°N) around Iceland in the spring, summer, and autumn of 2008. Between 4 and 36 tows were performed per sampling region. This dataset includes umbrella diameter, dry and wet mass, as well as abundance data of two species: Aurelia aurita and Cyanea capillata.
DOI: 10.1594/pangaea.973055
title: Surface dissolved nitrous oxide concentrations during Navicula cruise N2302 (Lake Grevelingen, The Netherlands)

description: The dataset comprises high-resolution (1-min) measurements of dissolved nitrous oxide in surface waters of Lake Grevelingen (The Netherlands), which were collected during the expedition N2302 on board R/V Navicula (February-March 2023). Seawater was drawn on board by means of a submersible pump installed at 1 m depth, and measurements of equilibrated headspace were carried out as described in Arévalo-Martínez et al. (2013): https://doi.org/10.5194/os-9-1071-2013.
description: Samples labelled as "_underway" are high-resolution measurements:OA-ICOS Analyzer coupled to shower head equilibrator as in Arévalo-Martínez et al. (2013): https://doi.org/10.5194/os-9-1071-2013Equilibration temperature measured with a FLUKE 1524 reference thermometer (+/-0.01°C)Sea surface temperature and salinity derived from discrete in-situ measurements with a Seabird SBE 911 plus Samples labelled as "_discrete" are surface samples collected along-track:Bubble-free sampling in 120 mL glass vials, headspace equilibration technique coupled to gas chromatography/electron capture detection analysis (See Wilson et al., https://doi.org/10.5194/bg-15-5891-2018, 2018).
DOI: 10.1594/pangaea.922595
title: Snow measurements at Brooks Gorge Research Watershed in 2016
DOI: 10.1594/pangaea.903761
title: Slope failures in high-mountain areas in the Alpine Region

description: In this work, we collected and validated a dataset of 391 slope instability events, documented from 2000 to 2016, at high elevation (above 1500 m a.s.l.), in the Italian Alps. Most of these events have been analyzed by means of a statistical-based approach to assess the role of climate forcing in their preparation and/or triggering and to detect the eventual signal related to climate change. This dataset is one of the very few in the world for high-mountain environments, considering both the number of events collected and the quality of their spatio-temporal localization.
description: Supplement to: Paranunzio, Roberta; Chiarle, Marta; Laio, Francesco; Nigrelli, Guido; Turconi, Laura; Luino, Fabio (2019): New insights in the relation between climate and slope failures at high-elevation sites. Theoretical and Applied Climatology, 137(3-4), 1765-1784
DOI: 10.1594/pangaea.973241
title: Water column dissolved nitrous oxide concentrations from Lake Grevelingen (The Netherlands)

description: The data set comprises concentrations of dissolved N2O from seawater samples collected during 16 expeditions to Lake Grevelingen (The Netherlands). The expeditions took place onboard R/V Navicula between the September 2020 and September 2023 and focused on physical and biogeochemical surveys of the area. Samples were collected by drawing water from a 10 L Niskin bottle into borosilicate 100 mL vials, which were then sealed with rubber (butyl) stoppers and aluminium caps. Immediately after collection, samples were preserved by adding 200 µL of a saturated mercuric chloride solution. Samples were analyzed by means of a standard headspace method coupled to gas chromatography/electron capture detection (see e.g. Wilson et al., 2018; https://doi.org/10.5194/bg-15-5891-2018).
DOI: 10.1594/pangaea.967537
title: KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: sinking velocities

description: The data presented herein originates from a mesocosm study conducted as part of the EU H2020 OceanNETs project, aimed at investigating the ecological ramifications of ocean alkalinity enhancement. Nine mesocosms were deployed in Taliarte Harbour, Gran Canaria, Spain, and systematically sampled using integrated water samplers over the period spanning from September 10th to October 25th, 2021. Alkalinity was employed in a gradient design, ranging from ambient (0 µeq kg-1 added alkalinity, OAE0) to elevated levels of 2400 µeq kg-1 additional alkalinity (OAE2400) in increments of 300 µeq kg-1. The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry variables, including inorganic nutrients, carbonate chemistry parameters, and particulate matter, alongside chlorophyll a concentrations. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
DOI: 10.1594/pangaea.973983
title: Monthly 24-hour water parameter measurements from a Raspberry-based controller during a multi-stressor aquarium experiment

description: A 9-month aquarium experiment with the cold-water Dendrophyllia cornigera was conducted to investigate the single and combined effects of warming, acidification and deoxygenation on its ecophysiological response. The experiment took place at the Aquarium finisterrae (A Coruña, Spain) between 2022-05-06 and 2023-02-24. Treatment values for each parameter (current in situ vs. climate change) were: 12 °C and 15 °C (temperature); ~7.99 and 7.69 (pH); ~8.63 mg/L and 6.45 mg/L (dissolved oxygen concentration). A total of eight treatments (with 3 replicates each, 5 L aquaria) were set up. Raspberry-based controllers were set to modify and monitor the water temperature, pH and dissolved oxygen in every treatment. Values for temperature (ºC), pH (NBS scale) and oxygen (% saturation) were registered every 15 minutes in a database. The parameters were measured using ds18b20 temperature sensors, and Atlas Scientific lab grade pH and dissolved oxygen sensors. Every set of sensors was placed on each header tank, corresponding to each treatment (8 in total). Parameter setpoint values for each header tank were finely adjusted on the controller to ensure the treatment target values on each experimental aquaria. Oxygen sensors from treatments with ambient oxygen (~8.63 mg/L) were removed from the system due to calibration issues. Here, a monthly sample of the results for temperature, pH and oxygen for every header tank over 24 hours from June 2022 to February 2023 is presented. Values for pH (total scale) and dissolved oxygen (mg/L) were calculated using AquaEnv (Hofmann et al. 2010) and respR (Harianto et al. 2019) R packages, respectively, using the in situ temperature and salinity. Dissolved oxygen concentrations in treatment tanks under ambient oxygen conditions were obtained using independent measurements taken the same day with a YSI ProODO dissolved oxygen instrument.
DOI: 10.1594/pangaea.967340
title: KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: Bi-daily water column concentrations of particulate organic carbon and particulate inorganic carbon

description: The data presented herein originates from a mesocosm study conducted as part of the EU H2020 OceanNETs project, aimed at investigating the ecological ramifications of ocean alkalinity enhancement. Nine mesocosms were deployed in Taliarte Harbour, Gran Canaria, Spain, and systematically sampled using integrated water samplers over the period spanning from September 10th to October 25th, 2021. Alkalinity was employed in a gradient design, ranging from ambient (0 µeq kg-1 added alkalinity, OAE0) to elevated levels of 2400 µeq kg-1 additional alkalinity (OAE2400) in increments of 300 µeq kg-1. The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry variables, including inorganic nutrients, carbonate chemistry parameters, and particulate matter, alongside chlorophyll a concentrations. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
DOI: 10.1594/pangaea.967538
title: KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: particles per size class

description: The data presented herein originates from a mesocosm study conducted as part of the EU H2020 OceanNETs project, aimed at investigating the ecological ramifications of ocean alkalinity enhancement. Nine mesocosms were deployed in Taliarte Harbour, Gran Canaria, Spain, and systematically sampled using integrated water samplers over the period spanning from September 10th to October 25th, 2021. Alkalinity was employed in a gradient design, ranging from ambient (0 µeq kg-1 added alkalinity, OAE0) to elevated levels of 2400 µeq kg-1 additional alkalinity (OAE2400) in increments of 300 µeq kg-1. The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry variables, including inorganic nutrients, carbonate chemistry parameters, and particulate matter, alongside chlorophyll a concentrations. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
DOI: 10.1594/pangaea.967366
title: KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: Bi-daily water column concentrations of dissolved inorganic nutrients

description: The data presented herein originates from a mesocosm study conducted as part of the EU H2020 OceanNETs project, aimed at investigating the ecological ramifications of ocean alkalinity enhancement. Nine mesocosms were deployed in Taliarte Harbour, Gran Canaria, Spain, and systematically sampled using integrated water samplers over the period spanning from September 10th to October 25th, 2021. Alkalinity was employed in a gradient design, ranging from ambient (0 µeq kg-1 added alkalinity, OAE0) to elevated levels of 2400 µeq kg-1 additional alkalinity (OAE2400) in increments of 300 µeq kg-1. The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry variables, including inorganic nutrients, carbonate chemistry parameters, and particulate matter, alongside chlorophyll a concentrations. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
description: All the sampling processing and measurement was done according Murphy and Riley (1962), Mullin and Riley (1955) and Coverly et al. (2012)
DOI: 10.1594/pangaea.967539
title: KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: particles and weighted sinking velocities

description: The data presented herein originates from a mesocosm study conducted as part of the EU H2020 OceanNETs project, aimed at investigating the ecological ramifications of ocean alkalinity enhancement. Nine mesocosms were deployed in Taliarte Harbour, Gran Canaria, Spain, and systematically sampled using integrated water samplers over the period spanning from September 10th to October 25th, 2021. Alkalinity was employed in a gradient design, ranging from ambient (0 µeq kg-1 added alkalinity, OAE0) to elevated levels of 2400 µeq kg-1 additional alkalinity (OAE2400) in increments of 300 µeq kg-1. The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry variables, including inorganic nutrients, carbonate chemistry parameters, and particulate matter, alongside chlorophyll a concentrations. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
description: It contains all the mentioned (SV, ESD, Porosity) parameters, however "wheighing" was achieved differently: a threshold of 0.2 was applied, meaning that 20% of the cumulative particles volume lies below the given SV; for the achieved wheighind see particle_volume_threshhold.pdf
DOI: 10.1594/pangaea.951172
title: Lab experiment on the effects of temperature on kelp respiration rates

description: Kelps act as ecosystem engineers and foundation species on many polar rocky shore coastlines. The main driver for their vertical and latitudinal distribution is the underwater light climate and temperature. Both are changing drastically in the Arctic in the course of global climate change. It was the aim of this study to analyse the effects of rising temperature and deteriorating underwater light climate on the potential habitat of kelps in the Arctic. A laboratory experiment, in which we determined temperature-related changes in the light-use characteristics of two temperate kelp species (Alaria esculenta, Saccharina latissima) at 3, 7, and 11 °C. Therefore, grown sporophytes were sampled in the field from a sampling depth of 6–9 m. Meristematic discs (Ø 2 cm) were cut and distributed between temperature treatments and replicates. The experiment ran for seven days, during which the treatment temperature was increased every two days by 4 °C until treatment temperature was reached, allowing for successive acclimation. The photosynthesis vs. irradiance curves were measured with a 4-channel optode set-up (FireStingO2 Fibre-Optic Oxygen Meter FSO2-01, PyroScience Sensor technology, Aachen, Germany) by analysing the oxygen evolution in response to different light intensities within a 25 mL Schott bottle, each containing three meristematic discs. Maximum photosynthetic quantum yield was measured using a pulse amplitude modulated fluorometer (Portable Chlorophyll Fluorometer PAM-2100, Heinz Walz GmbH, Effeltrich, Germany). Pigment analysis was analysed with a High-Performance Liquid Chromatograph (HPLC, LaChromElite® system, L-2200 autosampler (chilled), DA-detetctor L-2450; VWR-Hitachi International GmbH, Darmstadt, Germany).
DOI: 10.1594/pangaea.967397
title: KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: carbonate chemistry

description: The data presented herein originates from a mesocosm study conducted as part of the EU H2020 OceanNETs project, aimed at investigating the ecological ramifications of ocean alkalinity enhancement. Nine mesocosms were deployed in Taliarte Harbour, Gran Canaria, Spain, and systematically sampled using integrated water samplers over the period spanning from September 10th to October 25th, 2021. Alkalinity was employed in a gradient design, ranging from ambient (0 µeq kg-1 added alkalinity, OAE0) to elevated levels of 2400 µeq kg-1 additional alkalinity (OAE2400) in increments of 300 µeq kg-1. The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry variables, including inorganic nutrients, carbonate chemistry parameters, and particulate matter, alongside chlorophyll a concentrations. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
DOI: 10.1594/pangaea.967399
title: KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: water column calcifiers

description: The data presented herein originates from a mesocosm study conducted as part of the EU H2020 OceanNETs project, aimed at investigating the ecological ramifications of ocean alkalinity enhancement. Nine mesocosms were deployed in Taliarte Harbour, Gran Canaria, Spain, and systematically sampled using integrated water samplers over the period spanning from September 10th to October 25th, 2021. Alkalinity was employed in a gradient design, ranging from ambient (0 µeq kg-1 added alkalinity, OAE0) to elevated levels of 2400 µeq kg-1 additional alkalinity (OAE2400) in increments of 300 µeq kg-1. The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry variables, including inorganic nutrients, carbonate chemistry parameters, and particulate matter, alongside chlorophyll a concentrations. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
DOI: 10.1594/pangaea.967401
title: KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: chlorophyll a

description: The data presented herein originates from a mesocosm study conducted as part of the EU H2020 OceanNETs project, aimed at investigating the ecological ramifications of ocean alkalinity enhancement. Nine mesocosms were deployed in Taliarte Harbour, Gran Canaria, Spain, and systematically sampled using integrated water samplers over the period spanning from September 10th to October 25th, 2021. Alkalinity was employed in a gradient design, ranging from ambient (0 µeq kg-1 added alkalinity, OAE0) to elevated levels of 2400 µeq kg-1 additional alkalinity (OAE2400) in increments of 300 µeq kg-1. The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry variables, including inorganic nutrients, carbonate chemistry parameters, and particulate matter, alongside chlorophyll a concentrations. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
DOI: 10.25549/uschist-c104-224952
title: The alumni magazine, vol. 2, no. 1 (1920 Oct.)

description: The alumni magazine, University of Southern California, vol. 2, no. 1 (1920 October). Published four times during the academic year, October, January, April and June.