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Under water video footage from Weddell seal NEU2024_wed_a_m_04_1 taken by seal mounted deployments during expedition ANT-Land_2024_SEAEIS (NEU2024)
No full textSEAls and cryobenthic communities at the Ekström Ice Shelf (SEAEIS) applies biologging technologies for studying the foraging ecology of Weddell seals with a direct link to the investigation of cryobenthic invertebrate communities beneath the Ekström Ice Shelf at Atka Bay. Incidences of cryobenthic communities beneath ice shelves are rare and recent discoveries. Combined seal- and ROV-borne imagery and novel sampling technologies led to the discovery of a cryobenthic isopod community (Antarcturus cf. spinacoronatus Schultz 1978), being attached head-down to the underside of floating shelf ice at Drescher Inlet (Riiser-Larsen Ice Shelf) at depths of around 80-150 m (Watanabe et al. 2006; Bornemann et al. 2016). These "hanging gardens" may represent a food horizon where seals could benefit from a local hotspot of high biologic activity. The presence of isopod aggregations explained a multimodal distribution of the seals' dive depths known from earlier investigations at Drescher Inlet, and could probably also be indicative for increased abundances of seals in Areas of Ecological Significance (AES) at the interface between shelf and sea ice. However, the question whether the aforementioned findings are representative for the far-ranging high Antarctic ice shelves or even unique remains open, and factors contributing to AES and their stability over time are largely unexplored. Therefore, we proposed a synoptic field study at Atka Bay (Neumayer Station III), where earlier deployments of satellite-linked data loggers also showed a mode in the distribution of bottom times spent at water depths corresponding to the underside of the floating shelf ice, thus supporting the hypothesis of ice shelf associated foraging
Under water video footage from Weddell seal NEU2022_wed_a_f_03_1 taken by seal mounted cameras during expedition ANT-Land_2022_SEAEIS (NEU2022)
No full textSEAls and cryobenthic communities at the Ekström Ice Shelf (SEAEIS) applies biologging technologies for studying the foraging ecology of Weddell seals with a direct link to the investigation of cryobenthic invertebrate communities beneath the Ekström Ice Shelf at Atka Bay. Incidences of cryobenthic communities beneath ice shelves are rare and recent discoveries. Combined seal- and ROV-borne imagery and novel sampling technologies led to the discovery of a cryobenthic isopod community (Antarcturus cf. spinacoronatus Schultz 1978), being attached head-down to the underside of floating shelf ice at Drescher Inlet (Riiser-Larsen Ice Shelf) at depths of around 80-150 m (Watanabe et al. 2006; Bornemann et al. 2016). These "hanging gardens" may represent a food horizon where seals could benefit from a local hotspot of high biologic activity. The presence of isopod aggregations explained a multimodal distribution of the seals' dive depths known from earlier investigations at Drescher Inlet, and could probably also be indicative for increased abundances of seals in Areas of Ecological Significance (AES) at the interface between shelf and sea ice. However, the question whether the aforementioned findings are representative for the far-ranging high Antarctic ice shelves or even unique remains open, and factors contributing to AES and their stability over time are largely unexplored. Therefore, we proposed a synoptic field study at Atka Bay (Neumayer Station III), where earlier deployments of satellite-linked data loggers also showed a mode in the distribution of bottom times spent at water depths corresponding to the underside of the floating shelf ice, thus supporting the hypothesis of ice shelf associated foraging
Water column raw data (Kongsberg EM 122 entire dataset) of RV SONNE during cruise SO245
No full textWater column raw data using the ship's own Kongsberg EM 122 multibeam echosounder was almost continuously recorded during RV SONNE cruise SO245. Data was recorded on 33 days between 2015-12-23 and 2016-01-25 in the South Pacific Ocean (during transit also crossing the flank of the Leont'ev Seamount). These profiles are part of the corresponding raw dataset (https://doi.org/10.1594/PANGAEA.980702) (which include the .all files). The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. This publication is conducted within the efforts of the German Marine Research Alliance in the core area 'Data management and Digitalization' (Deutsche Allianz Meeresforschung, DAM)
Multibeam bathymetry raw data (Kongsberg EM 122 entire dataset) of RV METEOR during cruise M207
No full textRaw multibeam bathymetry data were collected aboard RV METEOR during cruise M207 using a 12kHz Kongsberg EM 122 multibeam echosounder. The expedition took place during 2025-01-05 – 2025-02-11 from Belem (Brazil) to Mindelo (Cape Verde) in the Central Atlantic. The major aims of M207 are to investigate the variability of the western boundary current circulation off South America and to contribute to the assessment of the variability of the Atlantic Meridional Overturning Circulation (AMOC) at 11S. Data were recorded within the EEZ of Brazil as well as outside EEZs. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data and the cruise report for details. The data are unprocessed and can therefore contain incorrect depth measurements (artifacts) if not further processed. Note that refraction errors may occur when no proper SVP is applied. Data acquisition was done by GEOMAR Helmholtz Centre for Ocean Research, provision of the data is supported by the DAM Project Underway Research Data and published according to the FAIR principles
Mass concentration of submicron particulate methanesulfonic acid (MSA) measured in the Swiss container during MOSAiC 2019/2020
No full textThis dataset contains the mass concentration of submicron particulate methanesulfonic acid (MSA) measured during the year-long Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition from October 2019 to July 2020. The measurements were performed in the Swiss container on the D-deck of Research Vessel Polarstern, using a commercial Aerodyne Research Inc. High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS). The instrument was located behind an automated valve, which switched hourly between a total and an interstitial air inlet, with upper cutoff sizes of 40 and 1 µm respectively (Heutte et al. (2023), Beck et al. (2022), and Dada et al. (2022)). Ambient air was hence sampled alternately every hour from the total and interstitial inlets into an aerodynamic lens with a 1 µm critical orifice and a flow of 0.07 L/min.
All data were processed using SQUIRREL v1.65B and PIKA v1.25B within the IGOR Pro v9.00 software. This was done separately for the three distinct periods of available measurements, October to December 2019, March to May, and June to July 2020, as the instrument was each time in a different state (after long down times related to turbo pump failures). A general description of the instrument and of the calibrations for bulk species quantification can be found in Heutte et al. (2023) and the bulk submicron aerosol chemical composition from the AMS can be downloaded at doi:10.1594/PANGAEA.961009.
The mass concentration of particulate methanesulfonic acid was determined using the calibrated signal of the CH3SO2+ fragment at the mass-to-charge ratio (m/z) 79 and following the method outlined by Hodshire et al. (2019). The calibration factor applied to the CH3SO2+ ion fragment was equal to 12.1.
We applied two corrections. First, the switching valve caused data distortion, observed at every full hour (i.e., when the valve turns and the ambient sampling changes from one inlet to another, there is a brief moment with under-pressure in the inlet lines). Consequently, all data points within ± 2 min of the full hours were removed. Second, during some periods when the inlet switching valve was activated, we observed a difference pattern of mean and standard deviation of the measurements between even and odd hours, most probably caused by a persistent pressure drop in the inlet lines, resulting in a proportional reduction of the concentration measurements. The 1-h arithmetic mean of interstitial inlet measurements and the mean of the two adjacent hours of total inlet measurements were subtracted, and the resulting difference was added as a constant to the data points of the interstitial inlet measurements.
This dataset contains a pollution flag ("Flag, pollution") to flag datapoints that were identified as directly influenced by fresh local pollution (e.g., Polarstern exhaust, on-ice diesel generators, skidoos), where a flag equal to 0 indicates clean data and 1 indicates polluted data. The identification method, based on the cosine similarity of the measured mass spectra with a known reference polluted spectrum, is described in Dada et al. (2022). Additionally, a sparse filter with a moving window spanning 60 datapoints (approx. 1h30) was applied to define as entirely polluted periods where more than 60% of the points were already classified as polluted by the cosine similarity method
Physical oceanography from Video-CTD station M162/60-1 during METEOR cruise M162 (Atlantic Ocean, Gloria Fault)
No full textA video-guided CTD system was used on M162-cruise (06.03.- 11.04.2020, Hensen et al., 2020), to study oceanographic characteristics of the water column above the Gloria Fault system, Atlantic Ocean. The CTD (Sea-Bird Electronics, SBE9plus) was a real-time data acquisition system transmitting data via coaxial cable to the deck unit (SBE11plus). The Video-CTD rosette was equipped with additional sensors, i.e. for turbidity, O2, and CH4, to monitor fluid and gas release from the seafloor
Physical oceanography from Video-CTD station M162_85-1 during METEOR cruise M162 (Atlantic Ocean, Gloria Fault)
No full textA video-guided CTD system was used on M162-cruise (06.03.- 11.04.2020, Hensen et al., 2020), to study oceanographic characteristics of the water column above the Gloria Fault system, Atlantic Ocean. The CTD (Sea-Bird Electronics, SBE9plus) was a real-time data acquisition system transmitting data via coaxial cable to the deck unit (SBE11plus). The Video-CTD rosette was equipped with additional sensors, i.e. for turbidity, O2, and CH4, to monitor fluid and gas release from the seafloor
Chlorophyll a measurements from discrete water samples during RV MARIA S. MERIAN cruise MSM65 (2017-06-25 – 2017-07-19, GREENHAB II)
No full textThis dataset was collected during the cruise MSM65 (GREENHAB II, 2017-06-25 – 2017-07-19) with RV MARIA S MERIAN from St. John's, Canada to Nuuk, Greenland. It contains chlorophyll a measurements [µg/L] from water samples collected from discrete sampling via CTD. In total, 46 stations have been sampled from various depth. To obtain chl-a concentrations water samples were filtered onboard through 0.7 μm pore size, glass fiber filters (Whatmann GF/F) under low vacuum. Filters were frozen immediately at -80 °C until extraction in laboratory via 90% acetone. Concentrations were calculated from fluorescence measured with a pre-calibrated Turner Design TD700 laboratory fluorometer (EPA445.0, Arar & Collins, 1997)