666 Works

Global planktonic foraminifera seasonality, supplement to: Jonkers, Lukas; Kucera, Michal (2015): Global analysis of seasonality in the shell flux of extant planktonic Foraminifera. Biogeosciences, 12(7), 2207-2226

Lukas Jonkers & Michal Kucera
Shell fluxes of planktonic Foraminifera species vary intra-annually in a pattern that appears to follow the seasonal cycle. However, the variation in the timing and prominence of seasonal flux maxima in space and among species remains poorly constrained. Thus, although changing seasonality may result in a flux-weighted temperature offset of more than 5° C within a species, this effect is often ignored in the interpretation of Foraminifera-based paleoceanographic records. To address this issue we present...

Continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise PS83 (ANT-XXIX/10)

Ronny Engelmann, Hartwig Deneke, Andreas Foth, Sebastian Bley, Bernhard Pospichal, Henry Kleta & Andreas Macke
This data collection contains continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise PS83 (ANT-XXIX/10) from 2014-03-08 to 2014-04-11.

Differential GPS (DGPS) stationary and kinematic measurements on King Georg Island, Antarctica

Ulrike Falk, Hernán Sala & Damián López
During the summer field campaigns within the period November 2010 to March 2013, intensive repeat measurements with Differential GPS (DGPS) at static points of the mass balance stakes as well as kinematic tracks along a grid covering Fourcade and Polar Club glaciers on the Potter Peninsula and the Bellinghausen Dome on the Fieldes Peninsula were carried out. Data was gridded and interpolated to come up with a more exact topography (digital elevation model) for the...

Total Sky Imager observations and continuous radiation measurements during POLARSTERN cruise ANT-XXVIII/5 with links to images

Ronny Engelmann, Thomas Kanitz, Marlen Brückner, Henry Kleta & Andreas Macke
This data collection contains total Sky Imager observations and continuous radiation measurements during POLARSTERN cruise ANT-XXVIII/5 in 2012.

Sedimentological, biogeomcial and geochronological data of thermokarst lake sediment core PG1967, supplement to: Lenz, Josefine; Fritz, Michael; Schirrmeister, Lutz; Lantuit, Hugues; Wooller, Matthew J; Pollard, Wayne H; Wetterich, Sebastian (2013): Periglacial landscape dynamics in the western Canadian Arctic: Results from a thermokarst lake record on a push moraine (Herschel Island, Yukon Territory). Palaeogeography, Palaeoclimatology, Palaeoecology, 381-382, 15-25

Josefine Lenz, Michael Fritz, Lutz Schirrmeister, Hugues Lantuit, Matthew J Wooller, Wayne H Pollard & Sebastian Wetterich
Ice-rich permafrost landscapes are sensitive to climate and environmental change due to the melt-out of ground ice during thermokarst development. Thermokarst processes in the northern Yukon Territory are currently not well-documented. Lake sediments from Herschel Island (69°36'N; 139°04'W) in the western Canadian Arctic provide a record of thermokarst lake development since the early Holocene. A 727 cm long lake sediment core was analyzed for radiographic images, magnetic susceptibility, granulometry, and biogeochemical parameters (organic carbon, nitrogen,...

Mid-Wisconsin to Holocene permafrost and landscape dynamics based on a drained lake basin core from the northern Seward Peninsula, Northwest Alaska, supplement to: Lenz, Josefine; Grosse, Guido; Jones, Benjamin M; Walter Anthony, Katey M; Bobrov, Anatoly A; Wulf, Sabine; Wetterich, Sebastian (2015): Mid-Wisconsin to Holocene permafrost and landscape dynamics based on a drained lake basin core from the northern Seward Peninsula, Northwest Alaska. Permafrost and Periglacial Processes

Josefine Lenz, Guido Grosse, Benjamin M Jones, Katey M Walter Anthony, Anatoly A Bobrov, Sabine Wulf & Sebastian Wetterich
Permafrost-related processes drive regional landscape dynamics in the Arctic terrestrial system. A better understanding of past periods indicative of permafrost degradation and aggradation is important for predicting the future response of Arctic landscapes to climate change. Here, we used a multi-proxy approach to analyze a ~4 m long sediment core from a drained thermokarst lake basin on the northern Seward Peninsula in western Arctic Alaska (USA). Sedimentological, biogeochemistical, geochronological, micropaleontological (ostracoda, testate amoeba) and tephra...

Phytoplankton pigment concentrations in the South Atlantic Ocean, supplement to: Soppa, Mariana A; Hirata, Takafumi; Silva, Brenner; Dinter, Tilman; Peeken, Ilka; Wiegmann, Sonja; Bracher, Astrid (2014): Global retrieval of diatom abundance based on phytoplankton pigments and satellite data. Remote Sensing, 6(10), 10089-10106

Mariana A Soppa, Takafumi Hirata, Brenner Silva, Tilman Dinter, Ilka Peeken, Sonja Wiegmann & Astrid Bracher
Diatoms are the major marine primary producers on the global scale and, recently, several methods have been developed to retrieve their abundance or dominance from satellite remote sensing data. In this work, we highlight the importance of the Southern Ocean (SO) in developing a global algorithm for diatom using an Abundance Based Approach (ABA). A large global in situ data set of phytoplankton pigments was compiled, particularly with more samples collected in the SO. We...

Paleoclimate record combinatio of speleothems and of sediment core GeoB3910-2, supplement to: Stríkis, Nicolás Misailidis; Chiessi, Cristiano Mazur; da Cruz Junior, Francisco William; Vuille, Mathias; Cheng, Hai; de Souza Barreto, Eline A; Mollenhauer, Gesine; Kasten, Sabine; Karmann, Ivo; Edwards, R Lawrence; Bernal, Patricio A; dos Reis Sales, Hamilton (2015): Timing and structure of Mega-SACZ events during Heinrich Stadial 1. Geophysical Research Letters, 42(13), 5477-5484

Nicolás Misailidis Stríkis, Cristiano Mazur Chiessi, Francisco William da Cruz Junior, Mathias Vuille, Hai Cheng, Eline A de Souza Barreto, Gesine Mollenhauer, Sabine Kasten, Ivo Karmann, R Lawrence Edwards, Patricio A Bernal & Hamilton dos Reis Sales
A substantial strengthening of the South American monsoon system (SAMS) during Heinrich Stadials (HS) points toward decreased cross-equatorial heat transport as the main driver of monsoonal hydroclimate variability at millennial time-scales. In order to better constrain the exact timing and internal structure of HS1 over tropical South America we assessed two precisely dated speleothem records from central-eastern and northeastern Brazil in combination with two marine records of terrestrial organic and inorganic matter input into the...

Water chemistry and sediment age of lake Terrasovoje, Amery Oasis, East Antarctica, supplement to: Wagner, Bernd; Cremer, Holger; Hultzsch, Nadja; Gore, Damian B; Melles, Martin (2004): Late Pleistocene and Holocene history of Lake Terrasovoje, Amery Oasis, East Antarctica, and its climatic and environmental implications. Journal of Paleolimnology, 32(4), 321-339

Bernd Wagner, Holger Cremer, Nadja Hultzsch, Damian B Gore & Martin Melles
The late Quaternary palaeoenvironmental history of the southern Windmill Islands, East Antarctica, has been reconstructed using diatom assemblages from two long, well-dated sediment cores taken in two marine bays. The diatom assemblage of the lowest sediment layers suggests a warm climate with mostly open water conditions during the late Pleistocene. During the following glacial, the Windmill Islands were covered by grounded ice preventing any in situ bioproductivity. Following deglaciation, a sapropel with a well-preserved diatom...

Isotopic ratios, concentration of noble gases and mineral and bulk composition of extraterrestrial dust particles in Dome Fuji ice core, East Antarctica, supplement to: Misawa, Keji; Kohno, Mika; Tomiyama, Takayuki; Noguchi, Takaaki; Nakamura, Tomoki; Nagao, Keisuke; Mikouchi, Takashi; Nishiizumi, Kunihiko (2010): Two extraterrestrial dust horizons found in the Dome Fuji ice core, East Antarctica. Earth and Planetary Science Letters, 289(1-2), 287-297

Keji Misawa, Mika Kohno, Takayuki Tomiyama, Takaaki Noguchi, Tomoki Nakamura, Keisuke Nagao, Takashi Mikouchi & Kunihiko Nishiizumi
Two silicate-rich dust layers were found in the Dome Fuji ice core in East Antarctica, at Marine Isotope Stages 12 and 13. Morphologies, textures, and chemical compositions of constituent particles reveal that they are high-temperature melting products and are of extraterrestrial origin. Because similar layers were found ~2000 km east of Dome Fuji, at EPICA (European Project for Ice Coring in Antarctica)-Dome C, particles must have rained down over a wide area 434 and 481...

Water chemistry and diatom occurrences in sediments of Terrasovoje, Radok and Beaver Lake, Amery Oasis, East Antarctica, supplement to: Cremer, Holger; Gore, Damian B; Hultzsch, Nadja; Melles, Martin; Wagner, Bernd (2004): The diatom flora and limnology of lakes in the Amery Oasis, East Antarctica. Polar Biology, 27(9), 513-531

Holger Cremer, Damian B Gore, Nadja Hultzsch, Martin Melles & Bernd Wagner
The diatom flora of three lakes in the ice-free Amery Oasis, East Antarctica, was studied. Two of the lakes are meltwater reservoirs, Terrasovoje Lake (31 m depth) and Radok Lake (362 m depth), while Beaver Lake (>435 m depth) is an epishelf lake. The lakes can be characterized as cold, ultra-oligotrophic and alkaline, displaying moderate (Radok and Terrasovoje lakes) to high (Beaver Lake) conductivities. There was no diatom phytoplankton present in any of the three...

Selected soil properties and bacterial abundance in the glacier forefields 'Black Valley Transect' and 'Glacier Transect' on Larsemann Hills, East Antarctica, supplement to: Bajerski, Felizitas; Wagner, Dirk (2013): Bacterial succession in Antarctic soils of two glacier forefields on Larsemann Hills, East Antarctica. FEMS Microbiology Ecology, 85(1), 128-142

Felizitas Bajerski & Dirk Wagner
Antarctic glacier forefields are extreme environments and pioneer sites for ecological succession. Increasing temperatures due to global warming lead to enhanced deglaciation processes in cold-affected habitats, and new terrain is becoming exposed to soil formation and microbial colonization. However, only little is known about the impact of environmental changes on microbial communities and how they develop in connection to shifting habitat characteristics. In this study, using a combination of molecular and geochemical analysis, we determine...

Photosynthetically active radiation and microalgae and protist occurrence at ice stations of POLARSTERN cruise ARK-XIX/1, supplement to: Werner, Iris; Ikävalko, Johanna; Schünemann, Henrike (2007): Sea-ice algae in Arctic pack ice during late winter. Polar Biology, 30(11), 1493-1504

Iris Werner, Johanna Ikävalko & Henrike Schünemann
Pack ice around Svalbard was sampled during the expedition ARK XIX/1 of RV "Polarstern" (March-April 2003) in order to determine environmental conditions, species composition and abundances of sea-ice algae and heterotrophic protists during late winter. As compared to other seasons, species diversity of algae (total 40 taxa) was not low, but abundances (5,000-448,000 cells/l) were lower by one to two orders of magnitude. Layers of high algal abundances were observed both at the bottom and...

Water chemistry, sediment radiocarbon age and diatom zonation at Peterson Inlet and Browning Bay, Antarctica, supplement to: Cremer, Holger; Gore, Damian B; Melles, Martin; Roberts, Donna (2003): Palaeoclimatic significance of late Quaternary diatom assemblages from southern Windmill Islands, East Antarctica. Palaeogeography, Palaeoclimatology, Palaeoecology, 195(3-4), 261-280

Holger Cremer, Damian B Gore, Martin Melles & Donna Roberts
The late Quaternary palaeoenvironmental history of the southern Windmill Islands, East Antarctica, has been reconstructed using diatom assemblages from two long, well-dated sediment cores taken in two marine bays. The diatom assemblage of the lowest sediment layers suggests a warm climate with mostly open water conditions during the late Pleistocene. During the following glacial, the Windmill Islands were covered by grounded ice preventing any in situ bioproductivity. Following deglaciation, a sapropel with a well-preserved diatom...

Water chemistry, and abundance and carbon biomass of under-ice fauna during POLARSTERN cruise ARK-XIX/1 to the Storfjord area in 2003, supplement to: Werner, Iris (2005): Living conditions, abundance and biomass of under-ice fauna in the Storfjord area (western Barents Sea, Arctic) in late winter (March 2003). Polar Biology, 28(4), 311-318

Iris Werner
The under-ice habitat and fauna were studied during a typical winter situation at three stations in the western Barents Sea. Dense pack ice (7-10/10) prevailed and ice thickness ranged over <0.1-1.6 m covered by <0.1-0.6 m of snow. Air temperatures ranged between -1.8 and -27.5°C. The ice undersides were level, white and smooth. Temperature and salinity profiles in the under-ice water (0-5 m depth) were not stratified (T=-1.9 to -2.0°C and S=34.2-34.7). Concentrations of inorganic...

Geochemistry of selected Ferrar samples from Northern Victoria Land and George V Land during GANOVEX VIII, supplement to: Hanemann, Ricarda; Viereck-Götte, Lothar (2004): Geochemistry of jurassic Ferrar lava flows, sills and dikes sampled during the Joint German-Italian Antarctic Expedition 1999/2000. Terra Antartica, 11(1), 39-54

Ricarda Hanemann & Lothar Viereck-Götte
Newly sampled basaltic andesites and andesites from the tholeiitic Ferrar Supergroup of northern Victoria Land and George V Land, Antarctica, are attributed to the known low-Ti and high-Ti series. Aside from known sparsely distributed high-Ti extrusives, a high-Ti sill was found in the Alamein Range outside the Rennick Graben. Low-Ti lavas, sills and dikes display wide petrographical, mineral and geochemical variations, reflecting extensive in-situ differentiation. High-Ti rocks from Litell Rocks are homogeneous with respect to...

Sediment geochemistry and water trace metal concentration in Potter Cove, supplement to: Husmann, Gunnar; Abele, Doris; Monien, Donata; Monien, Patrick; Kriews, Michael; Philipp, Eva E R (2012): The influence of sedimentation on metal accumulation and cellular oxidative stress markers in the Antarctic bivalve Laternula elliptica. Estuarine, Coastal and Shelf Science, 111, 48-59

Gunnar Husmann, Doris Abele, Donata Monien, Patrick Monien, Michael Kriews & Eva E R Philipp
Recent rapid climate warming at the western Antarctic Peninsula (WAP) results in elevated glacial melting, enhanced sedimentary run-off, increased turbidity and impact of ice-scouring in shallow coastal areas. Discharge of mineral suspension from volcanic bedrock ablation and chronic physical disturbance is expected to influence sessile filter feeders such as the Antarctic soft shell clam Laternula elliptica ( King and Broderip, 1832). We investigated effects of sedimentary run-off on the accumulation of trace metals, and together...

Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands, supplement to: Roberts, Donna; McMinn, Andrew; Cremer, Holger; Gore, Damian B; Melles, Martin (2004): The Holocene evolution and palaeosalinity history of Beall Lake, Windmill Islands (East Antarctica) using an expanded diatom-based weighted averaging model. Palaeogeography, Palaeoclimatology, Palaeoecology, 208(1-2), 121-140

Donna Roberts, Andrew McMinn, Holger Cremer, Damian B Gore & Martin Melles
A mid-Holocene climate optimum is inferred from a palaeosalinity reconstruction of a closed saline lake (Beall Lake) from the Windmill Islands, East Antarctica using an expanded diatom salinity weighted averaging (WA) regression and calibration model.The addition of 14 lakes and ponds from the Windmill Islands, East Antarctica, to an existing weighted averaging regression and calibration palaeosalinity model of 33 lakes from the Vestfold Hills, East Antarctica expands the number of taxa and lakes and the...

Ichthyolith abunances, morphotypes and accumulation rates across the PETM

Douglas W Tomczik, Daniel E Gaskell, Elizabeth C Sibert & Richard D Norris
Ichthyolith abundances and accumulation rates for ODP 1209, ODP 1220, and ODP 1260. Ichthyolith morphotype relative abundances for ODP 1209, ODP 1220, and ODP 1260. Isotopic carbon data and ages for ODP 1209, ODP 1220, and ODP 1260

Geochemistry on sediments off NE Greenland, supplement to: Notholt, Hanne (1998): Die Auswirkungen der NorthEastWater-Polynya auf die Sedimentation vor NO-Grönland und Untersuchungen zur Paläo-Ozeanographie seit dem Mittelweichsel (The Implication of the NorthEastWater-Polynya on the Sedimentation by NE-Greenland and Late Quaternary Paleo-oceanic Investigations). Berichte zur Polarforschung = Reports on Polar Research, 275, 183 pp

Hanne Notholt
Sedimentation and the early diagenetic processes have been studied in surface sediments from the NE-Greenland shelf and continental slope. I have used these data together with geochemical and sedimentological investigations from seven long sediment cores from the NE- and E-Greenland continental margin between 80' and 72' N for reconstructing the paleoenvironmental history of the East- Greenland-Current (ff).

High-resolution in situ oxygen microprofiles, porewater and solid phase geochemistry from the Crimean shelf (Black Sea) from Maria S. Merian cruise MSM15/1, supplement to: Lichtschlag, Anna; Donis, Daphne; Janssen, Felix; Jessen, Gerdhard L; Holtappels, Moritz; Wenzhöfer, Frank; Mazulmyan, Sonia; Sergeeva, Nelly G; Waldmann, Christoph; Boetius, Antje (2015): Effects of fluctuating hypoxia on benthic oxygen consumption in the Black Sea (Crimean shelf). Biogeosciences, 12, 5075-5092

Anna Lichtschlag, Daphne Donis, Felix Janssen, Gerdhard L Jessen, Moritz Holtappels, Frank Wenzhöfer, Sonia Mazulmyan, Nelly G Sergeeva, Christoph Waldmann & Antje Boetius
The outer western Crimean shelf of the Black Sea is a natural laboratory to investigate effects of stable oxic versus varying hypoxic conditions on seafloor biogeochemical processes and benthic community structure. Bottom-water oxygen concentrations ranged from normoxic (175 µmol O2/L) and hypoxic (< 63 µmol O2/L) or even anoxic/sulfidic conditions within a few kilometers' distance. Variations in oxygen concentrations between 160 and 10 µmol/L even occurred within hours close to the chemocline at 134 m...

Chronostratigraphic framework at sites GeoB14403 and GeoB14414 from the Gela Basin, Sicily Channel, supplement to: Kuhlmann, Jannis; Asioli, Alessandra; Trincardi, Fabio; Klügel, Andreas; Huhn, Katrin (2015): Sedimentary response to Milankovitch-type climatic oscillations and formation of sediment undulations: evidence from a shallow-shelf setting at Gela Basin on the Sicilian continental margin. Quaternary Science Reviews, 108, 76-94

Jannis Kuhlmann, Alessandra Asioli, Fabio Trincardi, Andreas Klügel & Katrin Huhn
A multi-proxy chronological framework along with sequence-stratigraphic interpretations unveils composite Milankovitch cyclicity in the sedimentary records of the Last GlacialeInterglacial cycle at NE Gela Basin on the Sicilian continental margin. Chronostratigraphic data (including foraminifera-based eco-biostratigraphy and d18O records, tephrochronological markers and 14C AMS radiometric datings) was derived from the shallow-shelf drill sites GeoB14403 (54.6 m recovery) and GeoB14414 (27.5 m), collected with both gravity and drilled MeBo cores in 193 m and 146 m water...

Sapropel cycles in the Mediterranean Sea, supplement to: Emeis, Kay-Christian; Schulz, Hartmut; Struck, Ulrich; Rossignol-Strick, Martine; Erlenkeuser, Helmut; Howell, M W; Kroon, Dick; Mackensen, Andreas; Ishizuka, S; Oba, Tadamichi; Sakamoto, Tatsuhiko; Koizumi, Itaru (2003): Eastern Mediterranean surface water temperatures and d18O composition during deposition of sapropels in the late Quaternary. Paleoceanography, 18(1), 1005

Kay-Christian Emeis, Hartmut Schulz, Ulrich Struck, Martine Rossignol-Strick, Helmut Erlenkeuser, M W Howell, Dick Kroon, Andreas Mackensen, S Ishizuka, Tadamichi Oba, Tatsuhiko Sakamoto & Itaru Koizumi
Water column stratification increased at climatic transitions from cold to warm periods during the late Quaternary and led to anoxic conditions and sapropel formation in the deep eastern Mediterranean basins. High-resolution data sets on sea-surface temperatures (SST) (estimated from UK'37 indices) and d18O of planktonic foraminifer calcite (d18Ofc) across late Pleistocene sapropel intervals show that d18Ofc decreased (between 1 and 4.6 per mil) and SST increased (between 0.7° and 6.7°C). Maximal d18Oseawater depletion of eastern...

Alkenone accumulation and SST reconstruction for the Benguela upwelling zone, supplement to: Rosell-Melé, Antoni; Martínez‐García, Alfredo; McClymont, Erin L (2014): Persistent warmth across the Benguela upwelling system during the Pliocene epoch. Earth and Planetary Science Letters, 386, 10-20

Antoni Rosell-Melé, Alfredo Martínez‐García & Erin L McClymont
A feature of Pliocene climate is the occurrence of "permanent El Niño-like" or "El Padre" conditions in the Pacific Ocean. From the analysis of sediment cores in the modern northern Benguela upwelling, we show that the mean oceanographic state off Southwest Africa during the warm Pliocene epoch was also analogous to that of a persistent Benguela "El Niño". At present these events occur when massive southward flows of warm and nutrient-poor waters extend along the...

Pollen assemblages of modern soil samples and results of the pollen analysis of the PG1755 core from Lake Billyakh, Yakutia, Russia, supplement to: Müller, Stefanie; Tarasov, Pavel E; Andreev, Andrei A; Tütken, Thomas; Gartz, Steffi; Diekmann, Bernhard (2010): Late Quaternary vegetation and environments in the Verkhoyansk Mountains region (NE Asia) reconstructed from a 50-kyr fossil pollen record from Lake Billyakh. Quaternary Science Reviews, 29(17-18), 2071-2086

Stefanie Müller, Pavel E Tarasov, Andrei A Andreev, Thomas Tütken, Steffi Gartz & Bernhard Diekmann
Here we present a detailed radiocarbon-dated 936 cm long pollen record from Lake Billyakh (65°17' N, 126°47' E; 340 m a.s.l.) situated in the western part of the Verkhoyansk Mountains, about 140 km south of the Arctic Circle. A set of 53 surface pollen samples representing tundra, cold deciduous forest and taiga was collected in northern and central Yakutia communities to verify the accuracy of the quantitative biome reconstruction method and to obtain a more...

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