25 Works

Circum-Arctic distribution of chemical anti-herbivore compounds arctic shrubs

Elin Lindén, Mariska Te Beest, Ilka Abreu, Thomas Moritz, Maja Sundqvist, Isabel C Barrio, Julia Boike, John Bryant, Kari Anne Bråthen, Agata Buchwal, Guillermo Bueno, Alain Cuerrier, Dagmar Egelkraut, Bruce Forbes, Martin Hallinger, Monique Heijmans, Luise Hermanutz, David S Hik, Annika Hofgaard, Milena Holmgren, Diane C Huebner, Toke Hoye, Ingibjörg Jónsdóttir, Elina Kaarlejärvi, Emilie Kissler … & Johan Olofsson
Spatial variation in plant chemical defence towards herbivores can help us understand variation in herbivore top-down control of shrubs in the Arctic and possibly also shrub responses to global warming. Less defended, non-resinous shrubs could be more influenced by herbivores than more defended, resinous shrubs. However, sparse field measurements limit our current understanding of how much of the circum-Arctic variation in defence compounds is explained by taxa or defence functional groups (resinous/non-resinous). We measured circum-Arctic...

EMODnet Phase V Updated guidelines for SeaDataNet ODV production Eutrophication Contaminants

Marina Lipizer, Maria Eugenia Molina Jack, ELISABETH KUBIN, Luminita Buga, Lotta Fyrberg, Julie Gatti, Martin M Larsen, Gwenaëlle Moncoiffé, Ann Kristin Ostrem, Reiner Schlitzer, Karin Wesslander & Alessandra GIORGETTI

Locations of micro-inclusions identified with Raman spectroscopy in eleven samples (138-1340 m) from the EastGRIP ice core

Nicolas Stoll, Ilka Weikusat & Jan Eichler
Micro-inclusions in eleven samples from the upper 1340 m of the East Greenland Ice Core Project ice core in North-East Greenland were analysed with Raman spectroscopy. Ice samples were drilled and processed between 2016 and 2019, Raman analysis was performed between January 2020 and December 2020 at the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research. The samples are between 1.0 and 14.1 ka yr old and cover the Holocene, Younger Dryas, and...

Checklist to Support the Helmholtz Centers in Implementing Policies on Sustainable Research Software

Reinhard Messerschmidt, Heinz Pampel, Felix Bach, Wolfgang zu Castell, Michael Denker, Ants Finke, Bernadette Fritzsch, Martin Hammitzsch, Uwe Konrad, Yvonne Leifels, Christoph Möhl, Marco Nolden, Markus Scheinert, Tobias Schlauch, Thomas Schnicke & Dirk Steglich
As the digitalization of research and teaching progresses, the number of software solutions developed at scientific institutions and used for the purpose of knowledge production is increasing. The accessibility and reuse of scientific results called for under the heading “open science” can be ensured in many fields only if, in addition to research data, program code is also made openly accessible. The present guide is addressed to decision-makers at the Helmholtz Centers who deal with...

Decoupled dust deposition and ocean productivity in the Antarctic Zone of the Southern Ocean over the past 1.5 million years

Michael E. Weber , Ian Bailey , Sidney R. Hemming , Yasmina M. Martos , Brendan T. Reilly , Thomas A. Ronge , Stefanie Brachfeld , Trevor Williams , Maureen Raymo , Simon T. Belt , Hendrik Vogel , Victoria Peck , Linda Armbrecht , Alix Cage , Fabricio G. Cardillo , Zhiheng Du , Gerson Fauth , Christopher J. Fogwill , Marga Garcia , Marlo Garnsworthy , Anna Glüder , Michelle Guitard , Marcus Gutjahr , Iván Hernández-Almeida , Frida S. Hoem … & Xufeng Zheng
Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages and their role in influencing the carbon cycle. We report the first high-resolution record of dust deposition and ocean productivity for the Antarctic Zone, close to the main dust source, Patagonia. Our deep-ocean records cover the last 1.5 Ma, thus doubling that from Antarctic ice-cores. We find a ≥10-fold increase in dust deposition during glacials and a ≤5-fold...

Reconstructing past ice sheets and paleotopography using observations of past sea level and glacial geology

Evan James Gowan
During the Quaternary, large ice sheets repeatedly formed and retreated over continental North America and northern Europe, which in turn caused fluctuations in global sea level by up to 120 m. This caused substantial changes to the Earth's surface, changing the distribution of land, continental ice sheets, and ocean. I demonstrate a technique we use to reconstruct ice sheets and paleotopography, and its application for the past 800000 years. I show that with the use...

Antarctic sea ice reconstructions: pros and cons of highly branched isoprenoids as sea ice proxies

Nele Lamping , Wee Wei Khoo , Juliane Müller , Oliver Esper , Thomas Frederichs & Christian Haas
The reconstruction of past Antarctic sea ice coverage through the application of diatom assemblages is often hampered in near coastal environments due to silica dissolution effects. The more recently established approach of using highly branched isoprenoid biomarkers to identify past sea ice conditions seems a valid method to overcome this limitation and that may also provide insight into ice-shelf dynamics. Here, we evaluate the so-called PIPSO25 index applied to modern surface sediments from the Amundsen...

Fin whale tracks Elephant Island

Helena Herr, Leigh Hickmott, Sacha Viquerat & Simone Panigada
This data set comprises the the location data obtained via SPLASH LIMPET tags from four fin whales equipped with satellite transmitters at Elephant Island Antarctica in April / March 2021. Provided are the tag identifier (Ptt), transmitter model (instrument), the data and time of each recorded location, the satellite system used for transmission (type), a quality rating of the transmission (quality) as B, A, 0, 1, 2 or 3 in increasing order of position accuracy,...

Humpback whale song comparison for the Atlantic sector of the Southern Ocean

Elena Schall, Divna Djokic, Erin Ross-Marsh, Javier Oña, Judith Denkinger, Julio Ernesto Baumgarten, Linilson Rodrigues Padovese, Marcos R. Rossi-Santos, Maria Isabel Carvalho Goncalves, Renata Santoro Sousa-Lima, Rodrigo Hucke-Gaete, Simon Elwen, Susannah Buchan, Tess Gridley & Ilse Van Opzeeland
The results of comparative song analyses between the ASSO and the Ecuadorian and Brazilian breeding populations and recordings from the Chilean, South African and Namibian migration routes revealed that individuals from at least three humpback whale breeding populations most likely migrate to shared feeding grounds in the ASSO. Humpback whales from different populations potentially mix at different times (i.e., years) at feeding hotspots of variable locations.

Diatoms and plants sedimentary ancient DNA from Lake Satagay (Central Yakutia, Siberia) covering the last 10,800 years

Izabella Baisheva, Luidmila Pestryakova, Ramesh Glückler, Ulrike Herzschuh & Kathleen R. Stoof-Leichsenring
Our dataset consists of two metabarcoding datasets (1) targeting diatoms (rbcL) and (2) targeting plant taxa (trnL P6 loop) retrieved from sedimentary ancient DNA (sedaDNA) of Lake Satagay, Central Yakutia, Siberia (N 63.07816°, E 117.99806°). SedaDNA data for diatoms comprises 65 samples (sequencing run number APMG-32), whereas 61 samples were analyzed for plants (sequencing run number APMG-33). We used sedaDNA of diatoms (APMG-32) and plants (data from APMG-33 restricted to aquatic plants) to reconstruct aquatic...

Genomic Standards Consortium (GSC) Island Sampling Day: Moorea Reef to Ridges Genomic Transect

Erin Robinson
Here we describe a project that supports the mission of the Genomic Standards Consortium (GSC) and contributes to the “Ocean Biomolecular Observations Network” (OBON) and the “Ocean Best Practice System” (OBPS - Omics Task Team), flagship programs of the UN Ocean Decade of Ocean Science for Sustainable Development. The project serves as a test case for two related infrastructure projects that aim to improve standards, policies, and best practices in sample collection: Sampling Nature (SN)...

High-resolution bathymetry models for the Lena Delta and the Kolyma Gulf regions

Matthias Fuchs, Juri Palmtag, Bennet Juhls, Pier Paul Overduin, Guido Grosse, Ahmed Abdelwahab, Michael Bedington, Tina Sanders, Olga Ogneva, Irina V Fedorova, Nikita S Zimov, Paul James Mann & Jens Strauss
This data set includes spatial high-resolution bathymetry data sets for the Lena Delta and Kolyma Gulf regions. Based on large-scale current and historical nautical maps, depth points and isobaths lines were manually digitized and served as input data for the bathymetry models. The models were calculated with the topo to raster tool in ArcGIS TM version 10.6 into a 50 m (TTR50) and a 200 m (TTR200) grid cell bathymetry for both regions. The models...

Helmholtz Open Science Briefing: Zweites Helmholtz Open Science Forum \"Helmholtz in der Nationalen Forschungsdateninfrastruktur (NFDI)\": Report

Nina Leonie Weisweiler, Roland Bertelmann, Constanze Curdt, Frank Oliver Glöckner, Uwe Jandt, Achim Streit, York Sure-Vetter & Nicolas Villacorta
Zur Förderung des Dialogs zur NFDI in der Helmholtz-Gemeinschaft veranstaltete das Helmholtz Open Science Office am 8. Dezember 2021 ein zweites virtuelles Helmholtz Open Science Forum unter dem Motto „Helmholtz in der Nationalen Forschungsdateninfrastruktur (NFDI)“. Alle Mitarbeitenden der Helmholtz-Gemeinschaft waren eingeladen, sich an dem zentrenübergreifenden Austausch zu beteiligen. Aufbauend auf das erste Forum im Mai 2021 lag der Schwerpunkt der Veranstaltung auf der Identifikation und Diskussion von Helmholtzspezifischen Themen und Aktivitäten bei der Realisierung der...

Ku- and Ka-band polarimetric radar backscatter of Arctic sea ice between October 2019 and September 2020 - VERSION 2.0

Julienne Stroeve, Vishnu Nandan, Rasmus Tonboe, Stefan Hendricks, Robert Ricker & Gunnar Spreen
This data set provides processed Ku- and Ka-band fully-polarimetric backscatter and derived polarimetric parameters from hourly scans, acquired using the KuKa radar, during Legs 1, 2, 4 and 5 of the 2019-2020 MOSAiC International Arctic Drift Expedition. Scans were acquired during winter (Legs 1 and 2), advanced melt (Leg 4) and freeze-up (Leg 5) seasons, from various Remote Sensing (RS) sites, located in the MOSAiC ice floe. The first deployment of the KuKa radar was...

Data from: Data-driven bioregionalization: A seascape-scale study of macrobenthic communities in the Eurasian Arctic

Dmitrii Pantiukhin, Dieter Piepenburg, Miriam L. S. Hansen & Casper Kraan
Aim: We conduct the first model-based assessment of the biogeographical subdivision of Eurasian Arctic seas to (1) delineate spatial distribution and boundaries of macrobenthic communities on a seascape level; (2) assess the significance of environmental drivers of macrobenthic community structures; (3) compare our modelling results to historical biogeographical classifications; and (4) couple the model to climate-change scenarios of environmental changes to project potential shifts in the distribution and composition of macrobenthic communities by 2100. Location:...

High-resolution bathymetry model for the Lena Delta region

Matthias Fuchs, Juri Palmtag, Bennet Juhls, Pier Paul Overduin, Guido Grosse, Ahmed Abdelwahab, Michael Bedington, Tina Sanders, Olga Ogneva, Irina V Fedorova, Nikita S Zimov, Paul James Mann & Jens Strauss
This data set includes the 50 m and 200 m bathymetry model for the Lena Delta region covering 232,700 km2 stretching from Cape Mamontov Klyk in the western Laptev Sea to Kotelny Island in the New Siberian Islands. The models were calculated with the topo to raster tool in ArcGIS TM version 10.6 based on depth points and isobaths lines derived from large-scale current and historical nautical maps.The final bathymetry models are available in GeoTiff...

Deposition of Subglacial Lake Sediments underneath the Laurentide Ice Sheet? – Sediment Cores from Lake Melville, Canada, provide first Evidence

Sophie Kowalski, Christian Ohlendorf, Jens Matthiessen & Andrea Catalina Gebhardt
Lake Melville is a fjord-type lake located in Labrador, Eastern Canada, as part of the Hamilton Inlet System. It is significantly characterised by its eastern connection to the Labrador Sea through a shallow sill at the entrance to the Rigolet Narrows. In contrast, the western part of the lake receives freshwater input from several major rivers. Previous studies assumed that Lake Melville was fully excavated by the Laurentide Ice Sheet (LIS) during the last glacial....

First evidence from Lake Melville, Canada: Subglacial lake sediments underneath the Laurentide Ice Sheet?

Sophie Kowalski , Christian Ohlendorf , Andrea Catalina Gebhardt & Jens Matthiessen
The fjord-type Lake Melville is located in Labrador, Eastern Canada, as part of the Hamilton Inlet System. It is mainly characterised by riverine freshwater influx into its western end and intrusion of saline water from the Labrador Sea through the shallow Rigolet Narrows. Previous studies assumed that the retreating Laurentide Ice Sheet (LIS) caused the deposition of a typical glacial sediment sequence when its margin reached Lake Melville between 10,000 to 8,000 years ago (King,...

Data for: Transformation of dissolved organic matter by two Indo-Pacific sponges

Tabea Hildebrand, Helena Osterholz, Carina Bunse, Hendrik Grotheer, Thorsten Dittmar & Peter J. Schupp
Dissolved organic matter (DOM) is the largest organic carbon reservoir in the ocean and an integral component of biogeochemical cycles. The role of free-living microbes in DOM transformation has been studied thoroughly, whereas little attention has been directed towards the influence of benthic organisms. Sponges are efficient filter feeders and common inhabitants of many benthic communities circumglobally. In our study, we investigated how two tropical coral reef sponges shape marine DOM. We compared bacterial abundance,...

Data for: Interspecific competition and facilitation coexist in mixed-species bird flocks of montane coniferous forests in Taiwan

Chao-Chieh Chen, Chun-Chieh Liao & Bruno Andreas Walther
Besides competition, positive interactions also play an important role in shaping the social structure of mixed-species bird flocks. This study aimed to illuminate the interspecific interactions of competition and facilitation in mixed-species bird flocks. We recorded the foraging behavior and microhabitat use of flocking species in montane coniferous forests of Taiwan under different social contexts. Foraging niche breadth and niche-overlap with other flocking species were compared between individuals inside and outside of mixed flocks. For...

Ten scientific messages on risks and opportunities for life in the Antarctic

Julian Gutt, Enrique Isla, José C. Xavier, Byron Adams, In-Young Ahn, Claudia Colesie, Vonda Cummings, Huw Griffiths, Ian D. Hogg, Trevor McIntyre, Klaus Martin Meiners, David Pearce, Lloyd Peck, Dieter Piepenburg, Ryan Reisinger, Grace Saba, Irene Schloss, Camila Signori, Craig Smith, Marino Vacchi, Cinzia Verde, Diana H. Wall & C.-H. Christina Cheng
Initiated by the SCAR scientific research programme “Antarctic Thresholds – Ecosystem Resilience and Adaptation” (AnT-ERA, 2013-2021), 26 experts synthesized knowledge on impacts and risks of climate-change on biological processes and ecosystem functions in the Antarctic.

High-resolution bathymetry model for the Kolyma Gulf region

Matthias Fuchs, Juri Palmtag, Bennet Juhls, Pier Paul Overduin, Guido Grosse, Ahmed Abdelwahab, Michael Bedington, Tina Sanders, Olga Ogneva, Irina V Fedorova, Nikita S Zimov, Paul James Mann & Jens Strauss
This data set includes the 50 m and 200 m bathymetry model for the Kolyma Gulf region covering an area of 12,100 km2 extending from the apex of the Kolyma Delta (5 km downstream of the city of Cherskiy) to 70 km offshore into the East Siberian Sea. The models were calculated with the topo to raster tool in ArcGIS TM version 10.6 based on depth points and isobaths lines derived from large-scale current and...

Greenland mass trends from airborne and satellite altimetry during 2011–2020

Shfaqat Abbas Khan, Jonathan L. Bamber, Eric Rignot, Veit Helm, Andy Aschwanden, David M. Holland, Michiel R. Van Den Broeke, Michalea King, Brice Noël, Martin Truffer, Angelika Humbert, William Colgan, Saurabh Vijay & Peter Kuipers Munneke
We use satellite and airborne altimetry to estimate annual mass changes of the Greenland Ice Sheet. We estimate ice loss corresponding to a sea-level rise of 6.9±0.4 millimeters from April 2011 to April 2020, with the highest annual ice loss rate of 1.4 mm/yr sea-level equivalent from April 2019 to April 2020. On a regional scale, our annual mass loss timeseries reveals 10-15 m/yr dynamic thickening at the terminus of Jakobshavn Isbræ from April 2016...

Accumulation rate of the B18_2012 firn core

Johannes Freitag, Sepp Kipfstuhl, Stefanie Weißbach, Nanna Bjørnholt Karlsson, Thomas Münch & Maria Hörhold
The annual accumulation rate in water equivalent depth was derived based on the density measurements and the dating.

Ancient sedimentary plant DNA dataset from Batagay (B17), Yakutia

Jérémy Courtin
Here we provide a dataset on genetic plant diversity retrieved from permafrost sedimentary ancient DNA (sedaDNA) of the Batagay megaslump, Yakutia. Our dataset encompasses sedaDNA sequence data of 10 sediment samples. We used a PCR-based metabarcoding approach combined with Next-Generation Sequencing to assess the past, local vegetation compositional changes around the megaslump. As a plant specific metabarcode we applied the established chloroplastidal P6 loop trnL marker for plant diversity assessment. PCR products were sequenced on...

Registration Year

  • 2022

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  • Alfred Wegener Institute for Polar and Marine Research
  • University of Bremen
  • GEOMAR Helmholtz Centre for Ocean Research Kiel
  • Alfred Wegener Institute - Research Unit Potsdam
  • Aarhus University
  • University of Alaska Fairbanks
  • Helmholtz Association of German Research Centres
  • Utrecht University
  • Helmholtz Centre for Environmental Research
  • Keele University