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  • 2015-2019  (202)
  • 2010-2014  (375)
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  • 1
    Online Resource
    Online Resource
    The expedition of the research vessel "Sonne" to the subpolar North Pacific and the Bering Sea in 2009 (SO202-INOPEX) (2012)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Details Availability
    Keywords: Forschungsbericht ; Beringmeer ; Pazifischer Ozean Nord ; Biogeochemie ; Paläoozeanographie
    Type of Medium: Online Resource
    Pages: Online-Ressource
    Series Statement: Berichte zur Polar- und Meeresforschung 643
    URL: http://hdl.handle.net/10013/epic.38996
    Language: English
    Note: Förderkennzeichen BMBF 03G0202A
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  • 2
    Online Resource
    Online Resource
    The expedition of the research vessel "Polarstern" to the polar South Pacific in 2009/2010 (ANT-XXVI/2 - BIPOMAC) (2011)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Details Availability
    Description / Table of Contents: Schwerpunkt der Expedition ANT-XXVI/2, die Polarstern über eine Distanz von 9.757 nm zum ersten Mal über den gesamten polaren Südpazifik nach Neuseeland gebracht hat, sind marin-geowissenschaftliche Probennahmen, die entlang der gesamten Fahrtroute durch bathymetrische (HYDROSWEEP) und sedimentechographische (PARASOUND) Vermessungen über 9.273 nm begleitet worden sind...Neben paläozeanographisch orientierten Probennahmen galten die geowissenschaftlichen Arbeiten auch der weiteren Erkundung und Dokumentation des Eltanin-Asteroideneinschlages vor 2,5 Mio. Jahre im Bereich des Freeden Seamounts. Darüber hinaus konnten durch Kombination von Sedimentprobennahme mit seismischen, bathymetrischen und sedimentechographischen Surveys Voruntersuchungen (pre-site survey) durchgeführt werden, die für die weitere Beantragung des Bohrvorschlages 625 - full (Cenozoic Southern Ocean Pacific, CESOP) (Gersonde et al., 2008) im Rahmen von Integrated Ocean Drilling Program (IODP) benötigt werden...Die Auswertung des Daten- und Probenmaterials erfolgt in nationaler und internationaler Zusammenarbeit im Rahmen des AWI-Programms PACES, der Programme des DFG-Forschungszentrums The Ocean in the Earth System und der EU-ProjektesPast4Future, des Integrated Ocean Drilling Program (IODP) und einer Reihe von einzelnen nationalen (DFG) und internationalen Projekten.
    Type of Medium: Online Resource
    Pages: Online-Ressource
    Series Statement: Berichte zur Polar- und Meeresforschung 632
    URL: http://hdl.handle.net/10013/epic.37910
    URL: http://hdl.handle.net/10013/epic.37910.d001
    Language: English
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  • 3
    Online Resource
    Online Resource
    SO202 - INOPEX : innovatives Nordpazifik Experiment ; Abschlussbericht ; Berichtszeitraum: 01.04.2009 - 31.08.2011 (2012)
    Bremerhaven
    Details Availability
    Keywords: Forschungsbericht ; Beringmeer ; Pazifischer Ozean Nord ; Biogeochemie ; Paläoozeanographie
    Type of Medium: Online Resource
    Pages: Online-Ressource (37 S., 1,77 MB) , graph. Darst., Kt.
    URL: https://edocs.tib.eu/files/e01fb12/723998825.pdf
    URL: https://doi.org/10.2314/GBV:723998825
    URL: https://edocs.tib.eu/files/e01fb12/723998825l.pdf
    DOI: 10.2314/GBV:723998825
    Language: German
    Note: Förderkennzeichen BMBF 03G0202A. - Auch als gedr. Ausg. vorhanden. - Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Systemvoraussetzungen: Acrobat reader.
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  • 4
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    Breakup of last glacial deep stratification in the South Pacific (2018)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 359 (6378). pp. 900-904.
    Details
    Publication Date: 2021-02-08
    Description: Stratification of the deep Southern Ocean during the Last Glacial Maximum is thought to have facilitated carbon storage and subsequent release during the deglaciation as stratification broke down, contributing to atmospheric CO2 rise. Here, we present neodymium isotope evidence from deep to abyssal waters in the South Pacific that confirms stratification of the deepwater column during the Last Glacial Maximum. The results indicate a glacial northward expansion of Ross Sea Bottom Water and a Southern Hemisphere climate trigger for the deglacial breakup of deep stratification. It highlights the important role of abyssal waters in sustaining a deep glacial carbon reservoir and Southern Hemisphere climate change as a prerequisite for the destabilization of the water column and hence the deglacial release of sequestered CO2 through upwelling.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1126/science.aao2473
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  • 5
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    Neodymium isotopic characterization of Ross Sea Bottom Water and its advection through the southern South Pacific (2015)
    Elsevier
    In:  Earth and Planetary Science Letters, 419 . pp. 211-221.
    Details
    Publication Date: 2020-10-21
    Description: Since the inception of the international GEOTRACES program, studies investigating the distribution of trace elements and their isotopes in the global ocean have significantly increased. In spite of this large-scale effort, the distribution of neodymium isotopes (143Nd/144Nd, εNd) and concentrations ([Nd]) in the high latitude South Pacific is still understudied, specifically north of the Antarctic Polar Front (APF). Here we report dissolved Nd isotopes and concentrations from 11 vertical water column profiles from the South Pacific between South America and New Zealand and across the Antarctic frontal system. Results confirm that Ross Sea Bottom Water (RSBW) is represented by an εNdvalue of ∼−7, and for the first time show that these Nd characteristics can be traced into the Southeast Pacific until progressive mixing with ambient Lower Circumpolar Deep Water (LCDW) dilutes this signal north of the APF. That is, εNdbehaves conservatively in RSBW, opening a path for studies of past RSBW behavior. Neodymium concentrations show low surface concentrations and a linear increase with depth north of the APF. South of the APF, surface [Nd] is high and increases with depth but remains almost constant below ∼1000m. This vertical and spatial [Nd] pattern follows the southward shoaling density surfaces of the Southern Ocean and hence suggests supply of Nd to the upper ocean through upwelling of Nd-rich deep water. Low particle abundance due to reduced opal production and seasonal sea ice cover likely contributes to the maintenance of the high upper ocean [Nd] south of the APF. This suggests a dominant lateral transport component on [Nd] and a reduced vertical control on Nd concentrations in the South Pacific south of the APF.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
    DOI: 10.1016/j.epsl.2015.03.011
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    From pole to pole: 33 years of physical oceanography onboard R/V Polarstern (2017)
    Copernicus Publications (EGU)
    In:  Earth System Science Data, 9 (1). pp. 211-220.
    Details
    Publication Date: 2020-02-06
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/essd-9-211-2017
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  • 7
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    Asymmetric signature of glacial Antarctic intermediate water in the Central South Pacific (2017)
    In:  [Poster] In: AGU Fall Meeting 2017, 11.12 - 15.12.2017, New Orleans, USA .
    Details
    Publication Date: 2018-03-12
    Description: Southern Ocean Intermediate Waters (SOIWs) play a key role in modulating the global climate on glacial-interglacial time scales as they connect the Southern Ocean and the tropics. Despite their importance, the past evolution of the SOIWs in the central South Pacific is largely unknown due to a dearth of sedimentary archives. Here we compare Mg/Ca-temperature, stable carbon and oxygen isotope records from surface-dwelling (G. bulloides) and deep-dwelling (G. inflata) planktic foraminifera at site PS75/059-2 (54°12.9’ S, 125°25.53’ W; recovery 13.98 m; 3.613 m water depth), located north of the modern Subantarctic Front. Our study focuses on the temperature and salinity variability controlled by SOIWs, which were subducted at the Subantarctic Front during the Last Glacial Maximum (LGM; ~29–17ka BP) and the Penultimate Glacial Maximum (PGM; ~180–150ka BP). During both glacial periods conditions at the subsurface ocean were colder and fresher relative to the Holocene (〈10ka) suggesting an enhanced presence of SOIWs. In spite of the comparable subsurface cooling during both glacial, the subsurface ocean during the PGM was saltier and 0.35‰ more depleted in δ13C in comparison to the LGM. Interestingly, the mean δ13C value of the PGM is comparable to the Carbon Isotope Minimum Events, which might suggests a larger contribution of “old” low δ13C deep waters to the study site during the PGM. A Latitudinal comparison of subsurface proxies suggests glacial asymmetries in the advection of SOIWs into the central Pacific, plausibly related to glacial changes in the convection depth of SOIWs at the South Antarctic Front area rather than changes in production of the SOIWs.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 8
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    Permafrost-carbon mobilization in Beringia caused by deglacial meltwater runoff, sea-level rise and warming (2019)
    IOP Publishing
    In:  Environmental Research Letters, 14 (8). Art.Nr. 085003.
    Details
    Publication Date: 2022-01-31
    Description: During the last deglaciation (18–8 kyr BP), shelf flooding and warming presumably led to a large-scale decomposition of permafrost soils in the mid-to-high latitudes of the Northern Hemisphere. Microbial degradation of old organic matter released from the decomposing permafrost potentially contributed to the deglacial rise in atmospheric CO2 and also to the declining atmospheric radiocarbon contents (Δ14C). The significance of permafrost for the atmospheric carbon pool is not well understood as the timing of the carbon activation is poorly constrained by proxy data. Here, we trace the mobilization of organic matter from permafrost in the Pacific sector of Beringia over the last 22 kyr using mass-accumulation rates and radiocarbon signatures of terrigenous biomarkers in four sediment cores from the Bering Sea and the Northwest Pacific. We find that pronounced reworking and thus the vulnerability of old organic carbon to remineralization commenced during the early deglaciation (~16.8 kyr BP) when meltwater runoff in the Yukon River intensified riverbank erosion of permafrost soils and fluvial discharge. Regional deglaciation in Alaska additionally mobilized significant fractions of fossil, petrogenic organic matter at this time. Permafrost decomposition across Beringia's Pacific sector occurred in two major pulses that match the Bølling-Allerød and Preboreal warm spells and rapidly initiated within centuries. The carbon mobilization likely resulted from massive shelf flooding during meltwater pulses 1A (~14.6 kyr BP) and 1B (~11.5 kyr BP) followed by permafrost thaw in the hinterland. Our findings emphasize that coastal erosion was a major control to rapidly mobilize permafrost carbon along Beringia's Pacific coast at ~14.6 and ~11.5 kyr BP implying that shelf flooding in Beringia may partly explain the centennial-scale rises in atmospheric CO2 at these times. Around 16.5 kyr BP, the mobilization of old terrigenous organic matter caused by meltwater-floods may have additionally contributed to increasing CO2 levels.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1088/1748-9326/ab2653
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  • 9
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    Biological response to millennial variability of dust and nutrient supply in the Subantarctic South Atlantic Ocean (2014)
    Royal Society Publishing
    In:  EPIC3Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Royal Society Publishing, 372(2019), pp. 20130054-20130054, ISSN: 1364-503X
    Details
    Publication Date: 2018-08-10
    Description: Fluxes of lithogenic material and fluxes of three palaeo-productivity proxies (organic carbon, biogenic opal and alkenones) over the past 100 000 years were determined using the 230Th-normalization method in three sediment cores from the Subantarctic South Atlantic Ocean. Features in the lithogenic flux record of each core correspond to similar features in the record of dust deposition in the EPICA Dome C ice core. Biogenic fluxes correlate with lithogenic fluxes in each sediment core. Our preferred interpretation is that South American dust, most probably from Patagonia, constitutes a major source of lithogenic material in Subantarctic South Atlantic sediments, and that past biological productivity in this region responded to variability in the supply of dust, probably due to biologically available iron carried by the dust. Greater nutrient supply as well as greater nutrient utilization (stimulated by dust) contributed to Subantarctic productivity during cold periods, in contrast to the region south of the Antarctic Polar Front (APF), where reduced nutrient supply during cold periods was the principal factor limiting productivity. The anti-phased patterns of productivity on opposite sides of the APF point to shifts in the physical supply of nutrients and to dust as cofactors regulating productivity in the Southern Ocean.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 10
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    Chapter 3.3. Palaeo-oceanography (2014)
    The Scientific Committee on Antarctic Research, Scott Polar Research Institute, Lensfield Road, Cambridge, CB2 1ER, United Kingdom (www.scar.org).
    In:  EPIC3Biogeographic Atlas of the Southern Ocean, Biogeographic Atlas of the Southern Ocean, Cambridge, The Scientific Committee on Antarctic Research, Scott Polar Research Institute, Lensfield Road, Cambridge, CB2 1ER, United Kingdom (www.scar.org)., 498 p., pp. 44-44, ISBN: 978-0-948277-28-3
    Details
    Publication Date: 2014-08-25
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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