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Book ; Online: Soil investigations at Casey and Arctowski stations, supplementary data to: B?lter, Manfred; Blume, Hans-Peter; Erlenkeuser, Helmut (1995): Pedologic, isotopic and microbiological properties of Antarctic soils. Polarforschung, 64(1), 1-7

Bölter, Manfred / Blume, Hans-Peter / Erlenkeuser, Helmut

2011

Abstract: Soils from the maritime (Arctowski Station, King George Island) and coastal continental (Casey Station, Wilkes Land) Antarctic region are described with respect to pedology, isotopic and microbial environments. They are classified as leptosols, regosols, ...

Abstract	Soils from the maritime (Arctowski Station, King George Island) and coastal continental (Casey Station, Wilkes Land) Antarctic region are described with respect to pedology, isotopic and microbial environments. They are classified as leptosols, regosols, podzols, and histosols. Only surface layers (1-3 cm) contain sufficient organic material to provide a favourable environment for microbial communities and, further, for accumulations of organic matter. Variability of biological and chemical properties is high on a centimeter scale with depth and in the range of decimeters in horizontal scales.
Language	English
Dates of publication	2011-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Online
Note	This dataset is supplement to hdl:10013/epic.29722.d001
DOI	10.1594/PANGAEA.767449
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Book ; Online: An internally consistent dataset of δ13C-DIC in the North Atlantic Ocean – NAC13v1

Becker, Meike / Andersen, Nils / Erlenkeuser, Helmut / Humphreys, Matthew P. / Tanhua, Toste / Körtzinger, Arne

eISSN: 1866-3516

2018

Abstract: The stable carbon isotope composition of dissolved inorganic carbon ( δ 13 C-DIC) can be used to quantify fluxes within the carbon system. For example, knowing the δ 13 C signature of the inorganic carbon pool can help in describing the amount of ... ...

Abstract	The stable carbon isotope composition of dissolved inorganic carbon ( δ 13 C-DIC) can be used to quantify fluxes within the carbon system. For example, knowing the δ 13 C signature of the inorganic carbon pool can help in describing the amount of anthropogenic carbon in the water column. The measurements can also be used for evaluating modeled carbon fluxes, for making basin-wide estimates of anthropogenic carbon, and for studying seasonal and interannual variability or decadal trends in interior ocean biogeochemistry. For all these purposes, it is not only important to have a sufficient amount of data, but these data must also be internally consistent and of high quality. In this study, we present a δ 13 C-DIC dataset for the North Atlantic which has undergone secondary quality control. The data originate from oceanographic research cruises between 1981 and 2014. During a primary quality control step based on simple range tests, obviously bad data were flagged. In a second quality control step, biases between measurements from different cruises were quantified through a crossover analysis using nearby data of the respective cruises, and values of biased cruises were adjusted in the data product. The crossover analysis was possible for 24 of the 32 cruises in our dataset, and adjustments were applied to 11 cruises. The internal accuracy of this dataset is 0.017 ‰. The dataset is available via the Carbon Dioxide Information Analysis Center (CDIAC) at http://cdiac.ornl.gov/oceans/ndp_096/NAC13v1.html , doi:10.3334/CDIAC/OTG.NAC13v1 .
Subject code	333
Language	English
Publishing date	2018-09-27
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Studien zur frühgeschichtlichen Keramik aus dem slawischen Burgwall bei Hollenstedt, Ldkr. Harburg

Erlenkeuser, Helmut

Studien zur frühgeschichtlichen Keramik aus dem slawischen Burgwall bei Hollenstedt, Ldkr. Harburg, Laux, Friedrich. - Neumünster : Wachholtz

1997

Document type	Article
Database	Former special subject collection: coastal and deep sea fishing

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Article ; Online: A "critical" climatic evaluation of last interglacial (MIS 5e) records from the Norwegian Sea

Bauch, Henning / Erlenkeuser, Helmut

2008

Language	English
Publisher	Norwegian Polar Institute
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: An Internally Consistent Dataset of delta13C-DIC in the North Atlantic Ocean - NAC13v1

Becker, Meike / Andersen, Nils / Erlenkeuser, Helmut / Humphreys, Matthew. P. / Tanhua, Toste / Körtzinger, Arne

2016

Abstract: The stable carbon isotope composition of dissolved inorganic carbon (δ13C-DIC) can be used to quantify fluxes within the carbon system. For example, knowing the δ13C signature of the inorganic carbon pool can help in describing the amount of ... ...

Abstract	The stable carbon isotope composition of dissolved inorganic carbon (δ13C-DIC) can be used to quantify fluxes within the carbon system. For example, knowing the δ13C signature of the inorganic carbon pool can help in describing the amount of anthropogenic carbon in the water column. The measurements can also be used for evaluating modeled carbon fluxes, for making basin-wide estimates of anthropogenic carbon, and for studying seasonal and interannual variability or decadal trends in interior ocean biogeochemistry. For all these purposes, it is not only important to have a sufficient amount of data, but these data must also be internally consistent and of high quality. In this study, we present a δ13C-DIC dataset for the North Atlantic which has undergone secondary quality control. The data originate from oceanographic research cruises between 1981 and 2014. During a primary quality control step based on simple range tests, obviously bad data were flagged. In a second quality control step, biases between measurements from different cruises were quantified through a crossover analysis using nearby data of the respective cruises, and values of biased cruises were adjusted in the data product. The crossover analysis was possible for 24 of the 32 cruises in our dataset, and adjustments were applied to 11 cruises. The internal accuracy of this dataset is 0.017 ‰.
Subject code	550
Language	English
Publishing date	2016-10-26
Publisher	Copernicus Publications (EGU)
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Physical properties of 4 cores from the Bengal Fan, supplementary data to: Weber, Michael E; Wiedicke-Hombach, Michael; Kudrass, Hermann-R; H?bscher, Christian; Erlenkeuser, Helmut (1997): Active Growth of the Bengal Fan during sea-level rise and highstand. Geology, 25(4), 315-318

Weber, Michael E / Erlenkeuser, Helmut / H?bscher, Christian / Kudrass, Hermann-R / Wiedicke-Hombach, Michael

2011

Abstract: New stratigraphic and high-resolution seismic data from the Bengal Fan indicate that the world's largest fan shows active growth during the most recent sea-level rise and the recent highstand. This unique phenomenon contradicts common sequence- ... ...

Abstract	New stratigraphic and high-resolution seismic data from the Bengal Fan indicate that the world's largest fan shows active growth during the most recent sea-level rise and the recent highstand. This unique phenomenon contradicts common sequence-stratigraphic models, and the sediment preserved provides new insight into the sedimentological response of a fan system to sea-level rise, climatic terminations, and monsoon intensity during the past climatic cycle. We present a detailed dated sequence of turbidite sedimentation based on a core transect perpendicular to the active channel-levee system in the upper mid-fan area. Between the two major terminations 1a (12 800 14C yr B.P.) and 1b (9700 14C yr B.P.), and especially at the end of the Younger Dryas, a 13-km-wide channel built up levees 50 m high. With decreasing sediment supply, continued sea-level rise, and increasing monsoon intensity during the early Holocene, turbidity currents were confined to the channel and gradually filled it. The canyon "Swatch of No Ground," a shelf depocenter that serves as the source for frequent turbidity currents, and the channel-levee system provide the unique opportunity for studying an active highstand system. Many fans showed this behavior only during lowered sea-level.
Language	English
Dates of publication	2011-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Online
Note	This dataset is supplement to doi:10.1130/0091-7613(1997)025<0315:AGOTBF>2.3.CO;2
DOI	10.1594/PANGAEA.761573
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Book ; Online: Stable carbon and oxygen isotope composition ofLate Cretaceous benthic foraminifera from the southern South Atlantic, supplementary data to: Friedrich, Oliver; Schmiedl, Gerhard; Erlenkeuser, Helmut (2006): Stable isotope composition of Late Cretaceous benthic foraminifera from the southern South Atlantic: Biological and environmental effects. Marine Micropaleontology, 58(2), 135-157

Friedrich, Oliver / Erlenkeuser, Helmut / Schmiedl, Gerhard

2006

Abstract: The stable carbon and oxygen isotope composition of different benthic foraminiferal species of the latest Campanian and earliest Maastrichtian from Ocean Drilling Project Hole 690C (Weddell Sea, southern South Atlantic, ~1800 m paleowater depth) have ... ...

Abstract	The stable carbon and oxygen isotope composition of different benthic foraminiferal species of the latest Campanian and earliest Maastrichtian from Ocean Drilling Project Hole 690C (Weddell Sea, southern South Atlantic, ~1800 m paleowater depth) have been investigated. The total range of measured isotope values of all samples exceeds ~4? for delta 13C and 1.1? for delta 18O. Carbon isotope values of proposed deep infaunal species are generally similar or only slightly lower when compared to proposed epifaunal to shallow infaunal species. Interspecific differences vary between samples probably reflecting temporal changes in organic carbon fluxes to the sea floor. Constantly lower delta 13C values for Pullenia marssoni and Pullenia reussi suggest the deepest habitat for these species. The strong depletion of delta 13C values by up to 3? within lenticulinids may be attributed to a deep infaunal microhabitat, strong vital effects, or different feeding strategy when compared to other species or modern lenticulinids. The mean delta 18O values reveal a strong separation of epifaunal to shallow infaunal and deep infaunal species. Epifaunal to shallow infaunal species are characterized by low delta 18O values, deep infaunal species by higher values. This result possibly reflects lower metabolic rates and longer life cycles of deep infaunal species or the operating of a pore water CO3(2-) effect on the benthic foraminiferal stable isotopes. Pyramidina szajnochae shows an enrichment of oxygen isotopes with test size comprising a total of 0.6? between 250 and 1250 ?m shell size. Although delta 13C lacks a corresponding trend these data likely represent the presence of changes in metabolic rates during ontogenesis. These results demonstrate the general applicability of multi-species stable isotope measurements of pristine Cretaceous benthic foraminifera to reconstruct past microhabitats and to evaluate biological and environmental effects on the stable isotope composition.
Language	English
Dates of publication	2006-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Online
Note	This dataset is supplement to doi:10.1016/j.marmicro.2005.10.005
DOI	10.1594/PANGAEA.676680
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Article ; Online: Impacts of orbital forcing and atmospheric carbon dioxide on Miocene ice-sheet expansion.

Holbourn, Ann / Kuhnt, Wolfgang / Schulz, Michael / Erlenkeuser, Helmut

Nature

2005 Volume 438, Issue 7067, Page(s) 483–487

Abstract: The processes causing the middle Miocene global cooling, which marked the Earth's final transition into an 'icehouse' climate about 13.9 million years ago (Myr ago), remain enigmatic. Tectonically driven circulation changes and variations in atmospheric ... ...

Abstract	The processes causing the middle Miocene global cooling, which marked the Earth's final transition into an 'icehouse' climate about 13.9 million years ago (Myr ago), remain enigmatic. Tectonically driven circulation changes and variations in atmospheric carbon dioxide levels have been suggested as driving mechanisms, but the lack of adequately preserved sedimentary successions has made rigorous testing of these hypotheses difficult. Here we present high-resolution climate proxy records, covering the period from 14.7 to 12.7 million years ago, from two complete sediment cores from the northwest and southeast subtropical Pacific Ocean. Using new chronologies through the correlation to the latest orbital model, we find relatively constant, low summer insolation over Antarctica coincident with declining atmospheric carbon dioxide levels at the time of Antarctic ice-sheet expansion and global cooling, suggesting a causal link. We surmise that the thermal isolation of Antarctica played a role in providing sustained long-term climatic boundary conditions propitious for ice-sheet formation. Our data document that Antarctic glaciation was rapid, taking place within two obliquity cycles, and coincided with a striking transition from obliquity to eccentricity as the drivers of climatic change.
MeSH term(s)	Antarctic Regions ; Atmosphere/chemistry ; Carbon Dioxide/metabolism ; Carbon Isotopes ; Cold Climate ; History, Ancient ; Ice Cover ; Oxygen/metabolism ; Oxygen Isotopes ; Pacific Ocean ; Temperature ; Tropical Climate ; Water Movements
Chemical Substances	Carbon Isotopes ; Oxygen Isotopes ; Carbon Dioxide (142M471B3J) ; Oxygen (S88TT14065)
Language	English
Publishing date	2005-11-24
Publishing country	England
Document type	Historical Article ; Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	120714-3
ISSN	1476-4687 ; 0028-0836
ISSN (online)	1476-4687
ISSN	0028-0836
DOI	10.1038/nature04123
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Book ; Online: Stable isotope ratios from foraminfera in Kara Sea sediments, supplementary data to: Simstich, Johannes; Stanovoy, Vladimir V; Bauch, Dorothea; Erlenkeuser, Helmut; Spielhagen, Robert F (2004): Holocene variability of bottom water hydrography on the Kara Sea shelf (Siberia) depicted in multiple single-valve analyses of stable isotopes in ostracods. Marine Geology, 206(1-4), 147-164

Simstich, Johannes / Bauch, Dorothea / Erlenkeuser, Helmut / Spielhagen, Robert F / Stanovoy, Vladimir V

2010

Abstract: Ostracods secrete their valve calcite within a few hours or days, therefore, its isotopic composition records ambient environmental conditions of only a short time span. Hydrographic changes between the calcification of individuals lead to a ... ...

Abstract	Ostracods secrete their valve calcite within a few hours or days, therefore, its isotopic composition records ambient environmental conditions of only a short time span. Hydrographic changes between the calcification of individuals lead to a corresponding range (max.-min.) in the isotope values when measuring several (>=5) single valves from a specific sediment sample. Analyses of living (stained) ostracods from the Kara Sea sediment surface revealed high ranges of >2per mil of d18O and d13C at low absolute levels (d18O: <3per mil, d13C: <-3per mil) near the river estuaries of Ob and Yenisei and low ranges of not, vert, similar1per mil at higher absolute levels (d18O: 2-5.4per mil, d13C: -3 per mil to -1.5per mil) on the shelf and in submarine paleo-river channels. Comparison with a hydrographic data base and isotope measurements of bottom water samples shows that the average and the span of the ostracod-based isotope ranges closely mirror the long-term means and variabilities (standard deviation) of bottom water temperature and salinity. The bottom hydrography in the southern part of the Kara Sea shows strong response to the river discharge and its extreme seasonal and interannual variability. Less variable hydrographic conditions are indicative for deeper shelf areas to the north, but also for areas near the river estuaries along submarine paleo-river channels, which act as corridors for southward flowing cold and saline bottom water. Isotope analyses on up to five single ostracod valves per sample in the lower section (8-7 cal. ka BP) of a sediment core north of Yenisei estuary revealed d18O and d13C values which on average are lower by 0.6? in both, d18O and d13C, than in the upper core section (<5 cal. ka BP). The isotope shifts illustrate the decreasing influence of isotopically light river water at the bottom as a result of the southward retreat of the Yenisei river mouth from the coring site due to global sea level rise. However, the ranges (max.-min.) in the single-valve d18O and d13C data of the individual core samples are similar in the upper and in the lower core section, although a higher hydrographic variability is expected prior to 7 cal. ka BP due to river proximity. This lack of variability indicates the southward flow of cold, saline water along a submarine paleo-river channel, formerly existing at the core location. Despite shallowing of the site due to sediment filling of the channel and isostatic uplift of the area, the hydrographic variability at the core location remained low during the Late Holocene, because the shallowing proceeded synchronously with the retreat of the river mouth due to the global sea level rise REFERENCE: Ivanova, Elena V (2006): The Global Thermohaline Paleocirculation. Scientific World, Moscow (original Russian version); Springer Science+Business Media B.V., 2009 (English translation), 320 pp
Language	English
Dates of publication	2010-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Online
Note	This dataset is cited by doi:10.1007/978-90-481-2415-2 ; This dataset is supplement to doi:10.1016/j.margeo.2004.01.008
DOI	10.1594/PANGAEA.754600
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Book ; Online: Investigation of N. pachyderma from the North Atlantic, supplementary data to: Bauch, Dorothea; Darling, Kate; Simstich, Johannes; Bauch, Henning A; Erlenkeuser, Helmut; Kroon, Dick (2003): Palaeoceanographic implications of genetic variation in living North Atlantic Neogloboquadrina pachyderma. Nature, 424(6946), 299-303

Bauch, Dorothea / Bauch, Henning A / Darling, Kate / Erlenkeuser, Helmut / Kroon, Dick / Simstich, Johannes

2010

Abstract: The shells of the planktonic foraminifer Neogloboquadrina pachyderma have become a classical tool for reconstructing glacial-interglacial climate conditions in the North Atlantic Ocean. Palaeoceanographers utilize its left- and right-coiling variants, ... ...

Abstract	The shells of the planktonic foraminifer Neogloboquadrina pachyderma have become a classical tool for reconstructing glacial-interglacial climate conditions in the North Atlantic Ocean. Palaeoceanographers utilize its left- and right-coiling variants, which exhibit a distinctive reciprocal temperature and water mass related shift in faunal abundance both at present and in late Quaternary sediments. Recently discovered cryptic genetic diversity in planktonic foraminifers now poses significant questions for these studies. Here we report genetic evidence demonstrating that the apparent 'single species' shell-based records of right-coiling N. pachyderma used in palaeoceanographic reconstructions contain an alternation in species as environmental factors change. This is reflected in a species-dependent incremental shift in right-coiling N. pachyderma shell calcite d18O between the Last Glacial Maximum and full Holocene conditions. Guided by the percentage dextral coiling ratio, our findings enhance the use of d18O records of right-coiling N. pachyderma for future study. They also highlight the need to genetically investigate other important morphospecies to refine their accuracy and reliability as palaeoceanographic proxies. REFERENCE: Simstich, Johannes (1999): Die ozeanische Deckschicht des Europäischen Nordmeers im Abbild stabiler Isotope von Kalkgehäusen unterschiedlicher Planktonforaminiferenarten. (Variations in the oceanic surface layer of the Nordic Seas: the stable-isotope record of polar and subpolar planctonic foraminifera). Berichte-Reports, Institut für Geowissenschaften, Universität Kiel, 2, 96 pp
Language	English
Dates of publication	2010-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Online
Note	This dataset is cited by doi:10.2312/reports-ifg.1999.2 ; This dataset is supplement to doi:10.1038/nature01778
DOI	10.1594/PANGAEA.754603
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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