Items where Author is "Hefter, Jens"

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Number of items: 44.

Article

Naafs, B. D. A. , Hefter, J. and Stein, R. (2012)
Application of the long chain diol index (LDI) paleothermometer to the early Pleistocene (MIS 96) ,

Organic Geochemistry, PERGAMON-ELSEVIER SCIENCE LTD, 49 , pp. 83-85 .

doi:10.1016/j.orggeochem.2012.05.011 , hdl:10013/epic.39708

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Article

Naafs, B. D. A. , Hefter, J. , Acton, G. , Haug, G. H. , Martínez-Garcia, A. , Pancost, R. and Stein, R. (2012)
Strengthening of North American dust sources during the late Pliocene (2.7Ma) ,

Earth and Planetary Science Letters, 317-31 , pp. 8-19 .

doi:10.1016/j.epsl.2011.11.026 , hdl:10013/epic.38646

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Article

Naafs, B. D. A. , Hefter, J. , Ferretti, P. , Stein, R. and Haug, G. H. (2011)
Sea surface temperatures did not control the first occurrence of Hudson Strait Heinrich Events during MIS 16 ,

Paleoceanography, 26 (4) .

doi:10.1029/2011PA002135 , hdl:10013/epic.38344

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Conference -Talk

Naafs, B. D. A. , Hefter, J. , Stein, R. and Haug, G. H. (2011)
Evidence for surface water warming in the IRD-belt during Heinrich Events ,

Interim Colloquium in Salamanca, Salamanca, Spain, September 2011 - unspecified .

hdl:10013/epic.39044

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Conference -Talk

Naafs, B. D. A. , Hefter, J. , Zhang, S. and Stein, R. (2011)
Tracing the source of IRD in the Heinrich Layers of the North Atlantic ,

Goldschmidt conference 2011, Prague, Czech Republic, August 2011 - August 2011 .

hdl:10013/epic.39045

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Article

Naafs, B. D. A. , Stein, R. , Hefter, J. , Khèlifi, N. , De Schepper, S. and Haug, G. H. (2010)
Late Pliocene changes in the North Atlantic Current ,

Earth and Planetary Science Letters, 298 (3), pp. 434-442 .

doi:10.1016/j.epsl.2010.08.023 , hdl:10013/epic.38277

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Article

Stein, R. , Hefter, J. , Grützner, J. , Voelker, A. and Naafs, B. D. A. (2009)
Variability of surface water characteristics and Heinrich‐like events in the Pleistocene midlatitude North Atlantic Ocean: Biomarker and XRD records from IODP Site U1313 (MIS 169) ,

Paleoceanography 24, PA2203 .

doi:10.1029/2008PA001639 , hdl:10013/epic.33241

Article

Hefter, J. (2008)
Analysis of Alkenone Unsaturation Indices with Fast Gas Chromatography/Time-of-Flight Mass Spectrometry ,

Analytical Chemistry .

doi:10.1021/ac702194m , hdl:10013/epic.30077

Conference -Poster

Hefter, J. , Stein, R. and Sinninghe Damsté, J. S. (2008)
The Biomarker Inventory, Trace, and Source of Heinrich Events and Heinrich-type Layers (MIS 8-16) in the North Atlantic. ,

IODP and ICDP Colloquium, Hannover/Germany, March 12-14 .

hdl:10013/epic.32099

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Conference -Talk

Hefter, J. , Stein, R. and Sinninghe Damsté, J. S. (2008)
The Biomarker Inventory, Trace, and Source of North Atlantic Heinrich Events. ,

SCAR/IASC IPY Open Science Conference "Polar Research Arctic and Antarctic Perspectives in the International Polar Year": Abstract Volume 145-146, Saint Petersburg/Russia, July 08-11 .

hdl:10013/epic.32100

Conference -Invited talk

Hefter, J. , Stein, R. , Sinninghe Damsté, J. S. and Zhang, S. (2008)
The biomarker inventory, trace, and source of North Atlantic iceberg invasions during the past 700.000 years. ,

LECO Advanced International User Practise Workshop, Mönchengladbach/Germany, October 28-29 .

hdl:10013/epic.32101

Conference -Poster

Hefter, J. , Stein, R. and Sinninghe Damsté, J. S. (2007)
The Biomarker Inventory, Trace, and Source of Heinrich Events and Heinrich-type Layers (MIS 8-16) in the North Atlantic ,

Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract PP41C-0689. .

hdl:10013/epic.30021

Conference -Poster

Hefter, J. and Stein, R. (2007)
The Biomarker Trace of Heinrich Events (IODP Exp. 303/306) ,

IODP/ODP and ICDP Colloquium, Potsdam/Germany, March 19-21 .

hdl:10013/epic.26601

Article

Benthien, A. , Zondervan, I. , Engel, A. , Hefter, J. , Terbrüggen, A. and Riebesell, U. (2007)
Carbon isotopic fractionation during a mesocosm bloom experiment dominated by Emiliania huxleyi: Effects of CO2 concentration and primary production ,

Geochimica et cosmochimica acta, 71 (6), pp. 1528-1541 .

doi:10.1016/j.gca.2006.12.015 , hdl:10013/epic.24570

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Conference -Invited talk

Hefter, J. and Stein, R. (2007)
The biomarker inventory, trace and source rock implications from Heinrich events (IODP Expedition 303/306) ,

Expeditions 303 & 306 2nd Post Expedition Meeting, May 14-17, Kona, Hawaii. .

hdl:10013/epic.32098

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Conference -Poster

Hefter, J. and Stein, R. (2006)
Biomarker Compositions as Source Indicators of Heinrich Layers in the Northern North Atlantic (IODP Exp. 303/306, Site 1305) ,

Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract PP23D-1791. .

hdl:10013/epic.32597

Conference -Talk

Stein, R. , Grützner, J. , Hefter, J. , Kanamatsu, T. and Alvarez-Zarikian, C. (2006)
IODP Expedition 306: Quaternary and Late Neogene North Atlantic Paleoceanography ,

IODP/ODP and ICDP Colloquium, Greifswald/Germany, March 27-29 .

hdl:10013/epic.24638

Conference -Invited talk

Stein, R. , Gruetzner, J. , Hefter, J. , Kanamatsu, T. and Alvarez-Zarikian, C. (2006)
IODP Expedition 306: Quaternary and Late Neogene North Atlantic Paleoceanography ,

IODP-ICDP Kolloquium, 27-29 March, Greifswald, Germany. .

hdl:10013/epic.25023

Conference -Poster

Stein, R. , Hefter, J. , Channell, J. E. T. , Kanamatsu, T. , Sato, T. , Malone, M. and Zarikian, C. (2005)
Late Neogene-Quaternary variability in North Atlantic paleoceanography: Preliminary results from IODP Expeditions 303 and 306 ,

2nd Alfred Wegener Symposium, 30 Oct - 02 Nov, Bremerhaven, Germany, Terra Nostra .

hdl:10013/epic.24202

Article

Birgel, D. , Stein, R. and Hefter, J. (2004)
Aliphatic lipids in recent sediments of the Fram Strait/Yermak Plateau (Arctic Ocean): Composition, sources and transport processes ,

Marine Chemistry, 88 , pp. 127-160 .

doi:10.1016/j.marchem.2004.03.006 , hdl:10013/epic.19721

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Conference -Poster

Benthien, A. , Riebesell, U. , Engel, A. , Zondervan, I. , Hefter, J. , Delille, B. , Harlay, J. and Jacquet, S. (2004)
Alkenone carbon isotopes during a bloom of Emiliania huxleyi: Effects of CO2 concentration and production. ,

8th International Conference on Paleoceanography (ICP VIII), 5-10 Sept., Biarritz, France .

hdl:10013/epic.22269

Conference -Poster

Kierdorf, C. , Hefter, J. and Stein, R. (2004)
Characterisation of the organic matter in surface sediments from the East Greenland continental margin ,

Bjerknes Centenary 2004, 01-03 September 2004, Bergen, Norway. .

hdl:10013/epic.21757

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Conference -Talk

Stein, R. , Fahl, K. and Hefter, J. (2004)
Organic-carbon sources and variability in sediments from the southern Kara Sea (Arctic Ocean): organic-geochemical bulk parameter vs. biomarker records ,

EUG, 1st General Assembly, Nice, FranceApril 2004. .

hdl:10013/epic.22091

Conference -Poster

Weller, P. , Hefter, J. , Stein, R. and Kuhn, G. (2004)
Paleoproductivity and paleotemperature variability in the mid-Pleistocene southern South Atlantic: Implications from biomarker records (ODP-Site 1089) ,

European Geosciences Union, 1st General Assembly, 25-30 April, Nice, France. .

hdl:10013/epic.21422

Conference -Poster

Weller, P. , Hefter, J. and Stein, R. (2004)
Paleoproductivity, paleotemperature and terrigenous input in the mid-Pleistocene southern South Atlantic: Implications from biomarker records (ODP-Site 1089) ,

Euroforum for scientific drilling in Bremen (IODP/ODP/ICDP.-19.03.2004). .

hdl:10013/epic.20757

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Conference -Poster

Benthien, A. , Zondervan, I. , Riebesell, U. , Engel, A. , Hefter, J. , Delille, B. , Harlay, J. and Jacquet, S. (2003)
Alkenone carbon isotopes during a bloom of Emiliania huxleyi: Effects of CO2 concentration and production. ,

EGS-AGU-EUG Joint Assembly, 7-11 April, Nice, France .

hdl:10013/epic.22280

Conference -Poster

Kierdorf, C. , Birgel, D. , Hefter, J. and Stein, R. (2003)
Organic carbon and biomarkers in surface sediments: a comparison between the Fram Strait / Yermak Plateau and the East Greenland continental margin ,

Sediment 2003, 10-13 Jun., Wilhelmshaven, Germany. .

hdl:10013/epic.19922

Article

Thiel, V. , Blumenberg, M. , Hefter, J. , Pape, T. , Pomponi, S. , Reed, J. , Reitner, J. , Wörheide, G. and Michaelis, W. (2002)
A chemical view of the most ancient metazoa - biomarker chemotaxonomy of hexactinellid sponges ,

Naturwissenschaften, 89 , pp. 60-66 .

doi:10.1007/s00114-001-0284-9 , hdl:10013/epic.15804

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Article

Mueller-Lupp, T. , Bauch, H. A. , Erlenkeuser, H. , Hefter, J. , Kassens, H. and Thiede, J. (2000)
Changes in the deposition of terrestrial organic matter on the Laptev Sea shelf during the Holocene: evidence from stable carbon isotopes ,

International Journal of Earth Sciences, 89 (3), pp. 563-568 .

doi:10.1007/s005310000128 , hdl:10013/epic.15551

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Article

Hefter, J. , Boucsein, B. and Stein, R. (2000)
Geochemistry of particulate organic matter in the water column and sediments ,

Berichte zur Polarforschung, 360 , pp. 79-83 .

hdl:10013/epic.17370

Article

Stein, R. , Boucsein, B. , Hefter, J. , Kraus, M. , Lau, N. , Schoster, F. , Simstich, J. and Weiel, D. (2000)
Marine Geology ,

Berichte zur Polarforschung, 360 , pp. 49-69 .

hdl:10013/epic.17094

Article

Seifert, R. , Delling, N. , Richnow, H. H. , Kempe, S. , Hefter, J. and Michaelis, W. (1999)
Ethylene and methane in the upper water column of the subtropical Atlantic ,

Biogeochemistry, 44 , pp. 73-91 .

hdl:10013/epic.16741

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Field Report

Stein, R. , Drachev, S. , Fahl, K. , Hefter, J. , Kassens, H. , Kokina, N. , Matthießen, J. , Müller, C. , Musatov, E. , Mutterlose, J. , Nörgaard-Petersen, N. , Polozek, K. , Shevchenko, V. and Usbeck, R. (1999)
Marine Geological Investigations. - In Jokat, W. (ed.), ARCTIC ´98: The Expedition ARK-XIV/1a of RV "Polarstern" in 1998. ,

[Field Report]

hdl:10013/epic.19946

Conference -Poster

Hefter, J. , Fahl, K. , Michaelis, W. and Stein, R. (1998)
Carbon isotopic and molecular characterization of sedimentary organic matter in the Late Quaternary Arctic Ocean ,

Eos, Transactions, American Geophysical Union,79,F501. .

hdl:10013/epic.17377

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Thesis -PhD

Hefter, J. (1997)
Biogeochemie löslicher und makromolekular gebundener organischer Verbindungen in Sedimenten, Erdölen und kontaminierten Böden ,

PhD thesis, Universität Hamburg.

hdl:10013/epic.16772

Article

Richnow, H. H. , Seifert, R. , Hefter, J. , Link, M. , Francke, W. , Schaefer, G. and Michaelis, W. (1997)
Organic pollutants associated with macromolecular soil organic matter: Mode of binding ,

Organic Geochemistry, 26 , pp. 745-758 .

hdl:10013/epic.16740

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Inbook

Richnow, H. H. , Eschenbach, A. , Hefter, J. , Kästner, M. , Mahro, B. , Seifert, R. and Michaelis, W. (1996)
Bildungsmechanismen von Bound Residues bei der biologischen Behandlung kontaminierter Böden ,

In: Cuno, M. (Hrsg.) Biologische und chemische Behandlung von PAK-haltigen Böden und Abwässern, Schriftenreihe Biologische Abwasserreinigung .

hdl:10013/epic.16739

Conference -Invited talk

Hefter, J. , Hauke, V. , Steiner, U. and Michaelis, W. (1996)
Molecular characterization of organic matter in methane producing areas of the Baltic Sea ,

In: Giere, O. & Fischer, U. (eds.): Abstracts and Program of the Workshop on Processes and Structures in Marine Methane and Sulfide Biotopes .

hdl:10013/epic.16738

Inbook

Hefter, J. , Hauke, V. , Richnow, H. H. and Michaelis, W. (1995)
Alkanoic subunits in sulfur-rich geomacromolecules: Information from stepwise chemical degradation and compound specific isotopic analysis ,

In: Vairavamurthy, M. (ed.) Geochemical Transformations of Sedimentary Sulfur. ACS Symposium Series, ISBN: 0-8412-3328-4 .

hdl:10013/epic.16737

Inbook

Hefter, J. , Richnow, H. H. , Seifert, R. and Michaelis, W. (1995)
<i>n</i>-Alkanoic compounds in sulphur-rich macromolecular substances: A detailed investigation of sulphur incorporation and cross-linking ,

In: Snape, C. (ed.): Composition, Geochemistry and Conversion of Oil Shales. NATO ASI Series C: Mathematical and Physical Sciences, ISBN: 0-7923-3343-8 .

hdl:10013/epic.16736