10,456 Works

Nd-Sr isotopes, diatom and biogenic opal content of Pliocene sediments from IODP Site 318-U1361, supplement to: Cook, Carys P; van de Flierdt, Tina; Williams, Trevor; Hemming, Sidney R; Iwai, Masao; Kobayashi, Munemasa; Jiménez-Espejo, Francisco Jose; Escutia, Carlota; Gonzàlez, Jhon Jairo; Khim, Boo-Keun; McKay, Robert M; Passchier, Sandra; Bohaty, Steven M; Riesselman, Christina R; Tauxe, Lisa; Sugisaki, Saiko; Lopez Galindo, Alberto; Patterson, Molly O; Sangiorgi, Francesca; Pierce, Elizabeth L; Brinkhuis, Henk; Klaus, Adam; Fehr, Annick; Bendle, James A; Bijl, Peter K; Carr, Stephanie A; Dunbar, Robert B; Flores, José-Abel; Hayden, Travis G; Katsuki, Kota; Kong, Gee Soo; Nakai, Mutsumi; Olney, Matthew P; Pekar, Stephen F; Pross, Jörg; Röhl, Ursula; Sakai, Toyusaburo; Shrivastava, Prakash Kumar; Stickley, Catherine E; Tuo, Shouting; Welsh, Kevin; Yamane, Masako (2013): Dynamic behaviour of the East Antarctic ice sheet during Pliocene warmth. Nature Geoscience, 6(9), 765-769

Carys P Cook, Tina van de Flierdt, Trevor Williams, Sidney R Hemming, Masao Iwai, Munemasa Kobayashi, Francisco Jose Jiménez-Espejo, Carlota Escutia, Jhon Jairo Gonzàlez, Boo-Keun Khim, Robert M McKay, Sandra Passchier, Steven M Bohaty, Christina R Riesselman, Lisa Tauxe, Saiko Sugisaki, Alberto Lopez Galindo, Molly O Patterson, Francesca Sangiorgi, Elizabeth L Pierce, Henk Brinkhuis, Adam Klaus, Annick Fehr, James A Bendle, Peter K Bijl … & Masako Yamane
Warm intervals within the Pliocene epoch (5.33-2.58 million years ago) were characterized by global temperatures comparable to those predicted for the end of this century (Haywood and Valdes, doi:10.1016/S0012-821X(03)00685-X) and atmospheric CO2 concentrations similar to today (Seki et al., 2010, doi:10.1016/j.epsl.2010.01.037; Bartoli et al., 2011, doi:10.1029/2010PA002055; Pagani et al., 2010, doi:10.1038/ngeo724). Estimates for global sea level highstands during these times (Miller et al., 2012, doi:10.1130/G32869.1) imply possible retreat of the East Antarctic ice sheet, but...

Grain-size distributions and bulk chemistry of sediment core MD00-2361, supplement to: Stuut, Jan-Berend W; Temmesfeld, Felix; De Deckker, Patrick (2014): A 550 ka record of aeolian activity near North West Cape, Australia: inferences from grain-size distributions and bulk chemistry of SE Indian Ocean deep-sea sediments. Quaternary Science Reviews, 83, 83-94

Jan-Berend W Stuut, Felix Temmesfeld & Patrick De Deckker
The terrigenous fraction of sediments from a deep-sea sediment core recovered from the northwestern Western Australian continental slope offshore North West Cape, SE Indian Ocean, reveals a history of Western Australian climate throughout the last 550 ka. End-member modelling of a data set of grain-size distributions (n = 438) of the terrigenous sediment fraction allows to interpret the record in terms of aeolian and fluvial sediment deposition, both related to palaeo-environmental conditions in the North...

Age determination and sedimentation rates of the subpolar northeast Atlantic, supplement to: Hall, Ian R; Colmenero-Hidalgo, Elena; Zahn, Rainer; Peck, Victoria L; Hemming, Sidney R (2011): Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago. Paleoceanography, 26(2), PA2224

Ian R Hall, Elena Colmenero-Hidalgo, Rainer Zahn, Victoria L Peck & Sidney R Hemming
In order to monitor the evolution of the British-Irish Ice Sheet (BIIS) and its influence in surface ocean structure during marine isotopic stages (MIS) 2 and 3, we have analyzed the sediments recovered in core MD04-2829CQ (Rosemary Bank, north Rockall Trough, northeast Atlantic) dated between ~41 and ~18 ka B.P. Ice-rafted debris flux and composition, 40Ar/39Ar ages of individual hornblende grains, multispecies planktonic stable isotope records, planktonic foraminifera assemblage data and faunal-based sea surface temperatures...

Geochemistry of the Kimmeridge Clay Formation, Dorset Coast, supplement to: Pearce, Christopher R; Coe, Angela L; Cohen, Anthony S (2010): Seawater redox variations during the deposition of the Kimmeridge Clay Formation, United Kingdom (Upper Jurassic): Evidence from molybdenum isotopes and trace metal ratios. Paleoceanography, 25(4), PA4213

Christopher R Pearce, Angela L Coe & Anthony S Cohen
The Kimmeridge Clay Formation (KCF) and its equivalents worldwide represent one of the most prolonged periods of organic carbon accumulation of the Mesozoic. In this study, we use the molybdenum (Mo) stable isotope system in conjunction with a range of trace metal paleoredox proxies to assess how seawater redox varied both locally and globally during the deposition of the KCF. Facies with lower organic carbon contents (TOC 1-7 wt %) were deposited under mildly reducing...

Foraminiferal assemblages of the Mackenzie-Beaufort Sea Slope and Amundsen Gulf, supplement to: Scott, David B; Schell, Trecia M; St-Onge, Guillaume; Rochon, André; Blasco, Steve (2009): Foraminiferal assemblage changes over the last 15,000 years on the Mackenzie-Beaufort Sea Slope and Amundsen Gulf, Canada: Implications for past sea ice conditions. Paleoceanography, 24(2), PA2219

David B Scott, Trecia M Schell, Guillaume St-Onge, André Rochon & Steve Blasco
Two cores, one from the Beaufort Sea Slope at 1000 m water depth (core 750) and one from the Amundsen Gulf at 426 m (core 124), were collected to help determine paleo-ice cover in the Holocene and late glacial of this area. Site 750 is particularly sensitive to changes in paleo-ice cover because it rests beneath the present ice margin of the permanent Arctic ice pack. Core 124 was sampled just in front of the...

Glacier mass balances of Stubacher Sonnblickkees, Hohe Tauern Range, Eastern Alps, Austria, 1958/1959 et seq

Heinz Slupetzky, Gerhard Ehgartner & Bernhard Zagel
Stubacher Sonnblickkees (SSK) is located in the Hohe Tauern Range (Eastern Alps) in the south of Salzburg Province (Austria) in the region of Oberpinzgau in the upper Stubach Valley. The glacier is situated at the main Alpine crest and faces east, starting at elevations close to 3050 m and in the 1980s terminated at 2500 m a.s.l. It had an area of 1.7 km² at that time, compared with 1 km² in 2013. The glacier...

Lake surface water temperatures of European Alpine lakes (1989-2013) based on the Advanced Very High Resolution Radiometer (AVHRR) 1-km data set, supplement to: Riffler, Michael; Lieberherr, Gian-Duri; Wunderle, Stefan (2015): Lake surface water temperatures of European Alpine lakes (1989–2013) based on the Advanced Very High Resolution Radiometer (AVHRR) 1 km data set. Earth System Science Data, 7(1), 1-17

Michael Riffler, Gian-Duri Lieberherr & Stefan Wunderle
Lake water temperature (LWT) is an important driver of lake ecosystems and it has been identified as an indicator of climate change. Consequently, the Global Climate Observing System (GCOS) lists LWT as an essential climate variable. Although for some European lakes long in situ time series of LWT do exist, many lakes are not observed or only on a non-regular basis making these observations insufficient for climate monitoring. Satellite data can provide the information needed....

Pollen and non-pollen palynomorph records of the Holocene part of the composite sediment core TMD from lake Tso Moriri (NW India) and of modern surface samples from the Tso Moriri region, supplement to: Leipe, Christian; Demske, Dieter; Tarasov, Pavel E; Wünnemann, Bernd; Riedel, Frank (2014): Potential of pollen and non-pollen palynomorph records from Tso Moriri Trans-Himalaya, NW India) for reconstructing Holocene limnology, and human-environmental interactions. Quaternary International, 348, 113-129

Christian Leipe, Dieter Demske, Pavel E Tarasov, Bernd Wünnemann & Frank Riedel
The high-altitude lake Tso Moriri (32°55'46'' N, 78°19'24'' E; 4522 m a.s.l.) is situated at the margin of the ISM and westerly influences in the Trans-Himalayan region of Ladakh. Human settlements are rare and domestic and wild animals are concentrating at the alpine meadows. A set of modern surface samples and fossil pollen from deep-water TMD core was evaluated with a focus on indicator types revealing human impact, grazing activities and lake system development during...

Evidence of cryptic and pseudocryptic speciation in the Paracalanus parvus species complex (Crustacea, Copepoda, Calanoida), supplementary material, supplement to: Cornils, Astrid; Held, Christoph (2014): Evidence of cryptic and pseudocryptic speciation in the Paracalanus parvus species complex (Crustacea, Copepoda, Calanoida). Frontiers in Zoology, 11(1), 19

Astrid Cornils & Christoph Held
IntroductionMany marine planktonic crustaceans such as copepods have been considered as widespread organisms. However, the growing evidence for cryptic and pseudo-cryptic speciation has emphasized the need of re-evaluating the status of copepod species complexes in molecular and morphological studies to get a clearer picture about pelagic marine species as evolutionary units and their distributions. This study analyses the molecular diversity of the ecologically important Paracalanus parvus species complex. Its seven currently recognized species are abundant...

Age models for sediment cores in the eastern tropical Pacific, supplement to: Pichevin, Laetitia; Ganeshram, Raja S; Francavilla, Stephen; Arellano-Torres, Elsa; Pedersen, Thomas F; Beaufort, Luc (2010): Interhemispheric leakage of isotopically heavy nitrate in the eastern tropical Pacific during the last glacial period. Paleoceanography, 25(1), PA1204

Laetitia Pichevin, Raja S Ganeshram, Stephen Francavilla, Elsa Arellano-Torres, Thomas F Pedersen & Luc Beaufort
We present new high-resolution N isotope records from the Gulf of Tehuantepec and the Nicaragua Basin spanning the last 50-70 ka. The Tehuantepec site is situated within the core of the north subtropical denitrification zone while the Nicaragua site is at the southern boundary. The d15N record from Nicaragua shows an 'Antarctic' timing similar to denitrification changes observed off Peru-Chile but is radically different from the northern records. We attribute this to the leakage of...

Coccolith fluxes in the Santa Barbara Basin, supplement to: Grelaud, Michaël; Beaufort, Luc; Cuven, Stéphanie; Buchet, Noëlle (2009): Glacial to interglacial primary production and El Niño-Southern Oscillation dynamics inferred from coccolithophores of the Santa Barbara Basin. Paleoceanography, 24(1), PA1203

Michaël Grelaud, Luc Beaufort, Stéphanie Cuven & Noëlle Buchet
We investigate the long-term stability of El Niño-Southern Oscillation and Pacific Decadal Oscillation based on the examination of coccolithophore assemblages in a largely laminated 35 ka sedimentary record, retrieved in the Santa Barbara Basin (core MD02-2503). At a centennial scale coccolith assemblages indicate low primary production in the basin from 35 to 11.5 ka B.P., whereas the Holocene is characterized by high-productivity conditions. This pattern demonstrates the influence of the glacial-interglacial cycles on productivity and,...

Water temperature and salinity data from southern elephant seals from Marion Island, supplement to: Roquet, Fabien; Wunsch, Carl; Forget, Gael; Heimbach, Patrick; Guinet, Christophe; Reverdin, Gilles; Charrassin, Jean-Benoît; Bailleul, Frederic; Costa, Daniel P; Huckstadt, Luis A; Goetz, Kimberly T; Kovacs, Kit Maureen; Lydersen, Christian; Biuw, Martin; Nøst, Ole Anders; Bornemann, Horst; Plötz, Joachim; Bester, Marthán Nieuwoudt; McIntyre, Trevor; Muelbert, Monica C; Hindell, Mark A; McMahon, Clive R; Williams, Guy; Harcourt, Robert; Field, Iain C; Chafik, Leon; Nicholls, Keith W; Boehme, Lars; Fedak, Mike A (2013): Estimates of the Southern Ocean general circulation improved by animal-borne instruments. Geophysical Research Letters, 40(23), 6176-6180

Fabien Roquet, Stefan Wunsch, Gael Forget, Patrick Heimbach, Christophe Guinet, Gilles Reverdin, Jean-Benoît Charrassin, Frederic Bailleul, Daniel P Costa, Luis A Huckstadt, Kimberly T Goetz, Kit Maureen Kovacs, Christian Lydersen, Martin Biuw, Ole Anders Nøst, Horst Bornemann, Joachim Plötz, Marthán Nieuwoudt Bester, Trevor McIntyre, Monica C Muelbert, Mark A Hindell, Clive R McMahon, Guy Williams, Robert Harcourt, Iain C Field … & Mike A Fedak
Over the last decade, several hundred seals have been equipped with conductivity-temperature-depth sensors in the Southern Ocean for both biological and physical oceanographic studies. A calibrated collection of seal-derived hydrographic data is now available, consisting of more than 165,000 profiles. The value of these hydrographic data within the existing Southern Ocean observing system is demonstrated herein by conducting two state estimation experiments, differing only in the use or not of seal data to constrain the...

Stable isotopes and ages from sediment core FR01/97-12, Tasman Sea, supplement to: Bostock, Helen C; Opdyke, Bradley N; Gagan, Michael K; Fifield, L Keith (2004): Carbon isotope evidence for changes in Antarctic Intermediate Water circulation and ocean ventilation in the southwest Pacific during the last deglaciation. Paleoceanography, 19(4), PA4013

Helen C Bostock, Bradley N Opdyke, Michael K Gagan & L Keith Fifield
Deep-sea sediment core FR1/97 GC-12 is located 990 mbsl in the northern Tasman Sea, southwest Pacific, where Antarctic Intermediate Water (AAIW) presently impinges the continental slope of the southern Great Barrier Reef. Analysis of carbon (d13C) and oxygen (d18O) isotope ratios on a suite of planktonic and benthic foraminifera reveals rapid changes in surface and intermediate water circulation over the last 30 kyr. During the Last Glacial Maximum, there was a large d13C offset (1.1...

Depth tie points and ages of IODP Site 306-U1314, supplement to: Gruetzner, Jens; Higgins, Sean M (2010): Threshold behavior of millennial scale variability in deep water hydrography inferred from a 1.1 Ma long record of sediment provenance at the southern Gardar Drift. Paleoceanography, 25(4), PA4204

Jens Gruetzner & Sean M Higgins
Integrated Ocean Drilling Program (IODP) Site U1314 of the North Atlantic is a critical sedimentary archive record of subpolar deep water from the southern Gardar Drift for which we derived an age model of orbital resolution for the last 1.8 Ma. This chronology combined with high-resolution (cm scale) X-ray fluorescence core scanning measurements of major elements allows tracking changes in terrigenous provenance during the last 1.1 Ma. Low Potassium to Titanium (K/Ti) ratios reflect enhanced...

Morphological, chemical and physical characteristics of cryosolic soils from Arctic Canada, supplement to: Tarnocai, Charles; Bockheim, James G (2011): Cryosolic soils of Canada: Genesis, distribution, and classification. Canadian Journal of Soil Science, 91(5), 749-762

Charles Tarnocai & James G Bockheim
Cryosols are permafrost-affected soils whose genesis is dominated by cryogenic processes, resulting in unique macromorphologies, micromorphologies, thermal characteristics, and physical and chemical properties. In addition, these soils are carbon sinks, storing high amounts of organic carbon collected for thousands of years. In the Canadian soil classification, the Cryosolic Order includes mineral and organic soils that have both cryogenic properties and permafrost within 1 or 2 m of the soil surface. This soil order is divided...

Slope stability analyses based on sediment cores of the Ligurian Margin, Southern France, supplement to: Ai, Fei; Förster, Annika; Stegmann, Sylvia; Kopf, Achim J (2014): Geotechnical Characteristics and Slope Stability Analysis on the Deeper Slope of the Ligurian Margin, Southern France. In: Kyoji Sassa, Paolo Canuti, Yueping Yin (eds.), Landslide Science for a Safer Geoenvironment, Volume 3: Targeted Landslides. Springer International Publishing AG, Switzerland, 549-555

Fei Ai, Annika Förster, Sylvia Stegmann & Achim J Kopf
Submarine slope failures of various types and sizes are common along the tectonic and seismically active Ligurian margin, northwestern Mediterranean Sea, primarily because of seismicity up to ~M6, rapid sediment deposition in the Var fluvial system, and steepness of the continental slope (average 11°). We present geophysical, sedimentological and geotechnical results of two distinct slides in water depth >1,500 m: one located on the flank of the Upper Var Valley called Western Slide (WS), another...

Planktonic foraminifer assemblages and stable oxygen and carbon isotope record of sediment core MD07-3076Q, supplement to: Gottschalk, Julia; Skinner, Luke C; Waelbroeck, Claire (2015): Contribution of seasonal sub-Antarctic surface water variability to millennial-scale changes in atmospheric CO2 over the last deglaciation and Marine Isotope Stage 3. Earth and Planetary Science Letters, 411, 87-99

Julia Gottschalk, Luke C Skinner & Claire Waelbroeck
We report high-resolution planktonic foraminifer census counts and stable oxygen and carbon isotope measurements of the planktonic foraminifera G. bulloides and N. pachyderma s. from sediment core MD07-3076Q for the last deglaciation, the last glacial maximum and Marine Isotope Stage 3. These data provide insights into the marine cycling of carbon and frontal dynamics in the sub-Antarctic Atlantic during the last 68 ka.

Dissolved and dissolvable iron concentrations and ligand characteristics in samples taken during POLARSTERN expedition ARK-XXII/2 to the Arctic Ocean, supplement to: Thuróczy, Charles-Edouard; Gerringa, Loes J A; Klunder, Maarten B; Laan, Patrick; Le Guitton, M; de Baar, Hein J W (2011): Distinct trends in the speciation of iron between the shallow shelf seas and the deep basins of the Arctic Ocean. Journal of Geophysical Research, 116(C10), C10009

Charles-Edouard Thuróczy, Loes J A Gerringa, Maarten B Klunder, Patrick Laan, M Le Guitton & Hein J W de Baar
The speciation of iron was investigated in three shelf seas and three deep basins of the Arctic Ocean in 2007. The dissolved fraction (<0.2 µm) and a fraction < 1000 kDa were considered here. In addition, unfiltered samples were analyzed. Between 74 and 83% of dissolved iron was present in the fraction < 1000 kDa at all stations and depth, except at the chlorophyll maximum (42-64%). Distinct trends in iron concentrations and ligand characteristics were...

Calcite accumulation in the eastern equatorial Pacific, supplement to: Loubere, Paul; Mekik, Figen; Francois, Roger; Pichat, Sylvain (2004): Export fluxes of calcite in the eastern equatorial Pacific from the Last Glacial Maximum to present. Paleoceanography, 19(2), PA2018

Paul Loubere, Figen Mekik, Roger Francois & Sylvain Pichat
The eastern equatorial Pacific (EEP) is an important center of biological productivity, generating significant organic carbon and calcite fluxes to the deep ocean. We reconstructed paleocalcite flux for the past 30,000 years in four cores collected beneath the equatorial upwelling and the South Equatorial Current (SEC) by measuring ex230Th-normalized calcite accumulation rates corrected for dissolution with a newly developed proxy for "fraction of calcite preserved". This method produced very similar results at the four sites...

Color data, carbon and oxygen isotopes, and offsets from BBCP Polecat Bench cores 2A and 2B, supplement to: Bowen, Gabriel J; Maibauer, Bianca J; Kraus, Mary J; Röhl, Ursula; Westerhold, Thomas; Steimke, Amy; Gingerich, Philip D; Wing, Scott L; Clyde, William C (2014): Two massive, rapid releases of carbon during the onset of the Palaeocene–Eocene thermal maximum. Nature Geoscience

Gabriel J Bowen, Bianca J Maibauer, Mary J Kraus, Ursula Röhl, Thomas Westerhold, Amy Steimke, Philip D Gingerich, Scott L Wing & William C Clyde
The Earth's climate abruptly warmed by 5-8 °C during the Palaeocene-Eocene thermal maximum (PETM), about 55.5 million years ago**1,2. This warming was associated with a massive addition of carbon to the ocean-atmosphere system, but estimates of the Earth systemresponse to this perturbation are complicated by widely varying estimates of the duration of carbon release, which range from less than a year to tens of thousands of years. In addition the source of the carbon, and...

Continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during METEOR cruise M96

Ronny Engelmann, Alexandra Pietsch, Annett Skupin, Bernhard Pospichal, Henry Kleta & Andreas Macke
This data collection contains continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during METEOR cruise M96 from 2013-04-28 to 2013-05-21.

Radiocarbon dates, accumulation rates, δ¹³C and July temperature of profiles obtained from Selwyn and Misaw Lake, subarctic Canada, supplement to: Kaislahti Tillman, Päivi; Holzkämper, Steffen; Kuhry, Peter; Sannel, A Britta K; Loader, Neil J; Robertson, Iain (2010): Long-term climate variability in continental subarctic Canada: A 6200-year record derived from stable isotopes in peat. Palaeogeography, Palaeoclimatology, Palaeoecology, 298(3-4), 235-246

Päivi Kaislahti Tillman, Steffen Holzkämper, Peter Kuhry, A Britta K Sannel, Neil J Loader & Iain Robertson
The rapid warming of arctic regions during recent decades has been recorded by instrumental monitoring, but the natural climate variability in the past is still sparsely reconstructed across many areas. We have reconstructed past climate changes in subarctic west-central Canada. Stable carbon and oxygen isotope ratios (d13C, d18O) were derived from a single Sphagnum fuscum plant component; alpha-cellulose isolated from stems. Periods of warmer and cooler conditions identified in this region, described in terms of...

Simulated change in atmospheric CO2 and D14C around 14.6 kyr BP, at the onset of the northern hemispheric warming into the Bølling/Allerød, supplement to: Köhler, Peter; Knorr, Gregor; Bard, Edouard (2014): Permafrost thawing as a possible source of abrupt carbon release at the onset of the Bølling/Allerød. Nature Communications, 5, 5520

Peter Köhler, Gregor Knorr & Edouard Bard
One of the most abrupt and yet unexplained past rises in atmospheric CO2 (10 p.p.m.v. in two centuries) occurred in quasi-synchrony with abrupt northern hemispheric warming into the Bølling/Allerød, 14,600 years ago. Here we use a U/Th-dated record of atmospheric D14C from Tahiti corals to provide an independent and precise age control for this CO2 rise. We also use model simulations to show that the release of old (nearly 14C-free) carbon can explain these changes...

Total Sky Imager observations and continuous radiation measurements during POLARSTERN cruise ANT-XXIX/1 with links to images

Ronny Engelmann, Thomas Kanitz, Bernhard Pospichal, Henry Kleta & Andreas Macke
This data collection contains total Sky Imager observations and continuous radiation measurements during POLARSTERN cruise ANT-XXIX/1 in 2012.

Magnesium concentrations of individual shells of Globorotalia truncatulinoides, supplement to: McKenna, V S; Prell, Warren L (2004): Calibration of the Mg/Ca of Globorotalia truncatulinoides (R) for the reconstruction of marine temperature gradients. Paleoceanography, 19(2), PA2006

V S McKenna & Warren L Prell
Recent work has provided useful Mg/Ca to water temperature calibrations for shallow-dwelling planktonic foraminifer species. Globorotalia truncatulinoides (right coiling (R)) is a deep-dwelling species that can serve as a source of information about the temporal variability in the water characteristics of the thermocline. We present a temperature calibration for the Mg/Ca in the shell of G. truncatulinoides (R) and examine some of the practical issues associated with evaluating the usefulness of the technique. The Mg/Ca...

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Affiliations

  • University of Iowa
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