Items where Author is "Hefter, Jens"

Queiroz Alves, E, Wong, W, Hefter, J, Grotheer, H, Tesi, T, Gentz, T, Zonneveld, K and Mollenhauer, G (2024) Deglacial export of pre-aged terrigenous carbon to the Bay of Biscay. Climate of the Past, 20(1). 121-136. doi:10.5194/cp-20-121-2024

Wei, B, Mollenhauer, G, Kusch, S, Hefter, J, Grotheer, H, Schefuß, E, Geibert, W, Ransby, D and Jia, G (2023) Anthropogenic perturbations change the quality and quantity of terrestrial carbon flux to the coastal ocean. Journal of Geophysical Research: Biogeosciences, 128(10). doi:10.1029/2023JG007482

Cao, M, Hefter, J, Tiedemann, R, Lembke-Jene, L, Meyer, VD and Mollenhauer, G (2023) Deglacial records of terrigenous organic matter accumulation off the Yukon and Amur rivers based on lignin phenols and long-chain n-alkanes. Climate of the Past, 19(1). 159-178. doi:10.5194/cp-19-159-2023

Ruben, M, Hefter, J, Schubotz, F, Geibert, W, Butzin, M, Gentz, T, Grotheer, H, Forwick, M, Szczuciński, W and Mollenhauer, G (2023) Fossil organic carbon utilization in marine Arctic fjord sediments by subsurface micro-organisms. Nature Geoscience, 16(7). 625-630. doi:10.1038/s41561-023-01198-z

Bertassoli, DJ, Häggi, C, Chiessi, CM, Schefuß, E, Hefter, J, Akabane, TK and Sawakuchi, AO (2022) Controls on the distributions of GDGTs and n-alkane isotopic compositions in sediments of the Amazon River Basin. Chemical Geology, 594. 120777. doi:10.1016/j.chemgeo.2022.120777

Wu, J, Mollenhauer, G, Stein, R, Köhler, P, Hefter, J, Fahl, K, Grotheer, H, Wei, B and Nam, SI (2022) Deglacial release of petrogenic and permafrost carbon from the Canadian Arctic impacting the carbon cycle. Nature Communications, 13(1). doi:10.1038/s41467-022-34725-4

Lindroth Dauner, AL, Mollenhauer, G, Hefter, J, Bícego, MC, de Mahiques, MM and Martins, CC (2022) Late Pleistocene to Holocene variations in marine productivity and terrestrial material delivery to the western South Atlantic. Frontiers in Marine Science, 9. doi:10.3389/fmars.2022.924556

Versteegh, GJM, Zonneveld, KAF, Hefter, J, Romero, OE, Fischer, G and Mollenhauer, G (2022) Performance of temperature and productivity proxies based on long-chain alkane-1, mid-chain diols at test: a 5-year sediment trap record from the Mauritanian upwelling. Biogeosciences, 19(5). 1587-1610. doi:10.5194/bg-19-1587-2022

Kusch, S, Mollenhauer, G, Willmes, C, Hefter, J, Eglinton, TI and Galy, V (2021) Controls on the age of plant waxes in marine sediments – A global synthesis. Organic Geochemistry, 157. 104259. doi:10.1016/j.orggeochem.2021.104259

Lamping, N, Müller, J, Hefter, J, Mollenhauer, G, Haas, C, Shi, X, Vorrath, ME, Lohmann, G and Hillenbrand, CD (2021) Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin. Climate of the Past, 17(5). 2305-2326. doi:10.5194/cp-17-2305-2021

Tesi, T, Muschitiello, F, Mollenhauer, G, Miserocchi, S, Langone, L, Ceccarelli, C, Panieri, G, Chiggiato, J, Nogarotto, A, Hefter, J, Ingrosso, G, Giglio, F, Giordano, P and Capotondi, L (2021) Rapid Atlantification along the Fram Strait at the beginning of the 20th century. Science Advances, 7(48). doi:10.1126/sciadv.abj2946

Mollenhauer, G, Grotheer, H, Gentz, T, Bonk, E and Hefter, J (2021) Standard operation procedures and performance of the MICADAS radiocarbon laboratory at Alfred Wegener Institute (AWI), Germany. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 496. 45-51. doi:10.1016/j.nimb.2021.03.016

Wei, B, Mollenhauer, G, Hefter, J, Kusch, S, Grotheer, H, Schefuß, E and Jia, G (2021) The nature, timescale, and efficiency of riverine export of terrestrial organic carbon in the (sub)tropics: Insights at the molecular level from the Pearl River and adjacent coastal sea. Earth and Planetary Science Letters, 565. 116934. doi:10.1016/j.epsl.2021.116934

Sun, S, Meyer, VD, Dolman, AM, Winterfeld, M, Hefter, J, Dummann, W, McIntyre, C, Montluçon, DB, Haghipour, N, Wacker, L, Gentz, T, van der Voort, TS, Eglinton, TI and Mollenhauer, G (2020) 14C blank assessment in small-scale compound-specific radiocarbon analysis of lipid biomarkers and lignin phenols. Radiocarbon, 62(1). 207-218. doi:10.1017/RDC.2019.108

Wei, B, Jia, G, Hefter, J, Kang, M, Park, E, Wang, S and Mollenhauer, G (2020) Comparison of the U-37(K'), LDI, TEX86H, and RI-OH temperature proxies in sediments from the northern shelf of the South China Sea. Biogeosciences, 17(17). 4489-4508. doi:10.5194/bg-17-4489-2020

Wei, B, Mollenhauer, G, Hefter, J, Grotheer, H and Jia, G (2020) Dispersal and aging of terrigenous organic matter in the Pearl River Estuary and the northern South China Sea Shelf. Geochimica et Cosmochimica Acta, 282. 324-339. doi:10.1016/j.gca.2020.04.032

Romero, OE, Baumann, KH, Zonneveld, KAF, Donner, B, Hefter, J, Hamady, B, Pospelova, V and Fischer, G (2020) Flux variability of phyto- and zooplankton communities in the Mauritanian coastal upwelling between 2003 and 2008. Biogeosciences, 17(1). 187-214. doi:10.5194/bg-17-187-2020

van Maldegem, LM, Sansjofre, P, Weijers, JWH, Wolkenstein, K, Strother, PK, Wörmer, L, Hefter, J, Nettersheim, BJ, Hoshino, Y, Schouten, S, Sinninghe Damsté, JS, Nath, N, Griesinger, C, Kuznetsov, NB, Elie, M, Elvert, M, Tegelaar, E, Gleixner, G and Hallmann, C (2019) Bisnorgammacerane traces predatory pressure and the persistent rise of algal ecosystems after Snowball Earth. Nature Communications, 10(1). doi:10.1038/s41467-019-08306-x

Ceccopieri, M, Carreira, RS, Wagener, ALR, Hefter, J and Mollenhauer, G (2019) Branched GDGTs as proxies in surface sediments from the south-eastern Brazilian continental margin. Frontiers in Earth Science, 7. doi:10.3389/feart.2019.00291

Häggi, C, Schefuß, E, Sawakuchi, AO, Chiessi, CM, Mulitza, S, Bertassoli, DJ, Hefter, J, Zabel, M, Baker, PA and Schouten, S (2019) Modern and late Pleistocene particulate organic carbon transport by the Amazon River: Insights from long-chain alkyl diols. Geochimica et Cosmochimica Acta, 262. 1-19. doi:10.1016/j.gca.2019.07.018

Meyer, VD, Hefter, J, Köhler, P, Tiedemann, R, Gersonde, R, Wacker, L and Mollenhauer, G (2019) Permafrost-carbon mobilization in Beringia caused by deglacial meltwater runoff, sea-level rise and warming. Environmental Research Letters, 14(8). 085003. doi:10.1088/1748-9326/ab2653

Crivellari, S, Chiessi, CM, Kuhnert, H, Häggi, C, Mollenhauer, G, Hefter, J, Portilho-Ramos, R, Schefuß, E and Mulitza, S (2019) Thermal response of the western tropical Atlantic to slowdown of the Atlantic Meridional Overturning Circulation. Earth and Planetary Science Letters, 519. 120-129. doi:10.1016/j.epsl.2019.05.006

Winterfeld, M, Mollenhauer, G, Dummann, W, Köhler, P, Lembke-Jene, L, Meyer, VD, Hefter, J, McIntyre, C, Wacker, L, Kokfelt, U and Tiedemann, R (2018) Deglacial mobilization of pre-aged terrestrial carbon from degrading permafrost. Nature Communications, 9(1). doi:10.1038/s41467-018-06080-w

Crivellari, S, Chiessi, CM, Kuhnert, H, Häggi, C, da Costa Portilho-Ramos, R, Zeng, JY, Zhang, Y, Schefuß, E, Mollenhauer, G, Hefter, J, Alexandre, F, Sampaio, G and Mulitza, S (2018) Increased Amazon freshwater discharge during late Heinrich Stadial 1. Quaternary Science Reviews, 181. 144-155. doi:10.1016/j.quascirev.2017.12.005

Park, E, Hefter, J, Fischer, G and Mollenhauer, G (2018) TEX86 in sinking particles in three eastern Atlantic upwelling regimes. Organic Geochemistry, 124. 151-163. doi:10.1016/j.orggeochem.2018.07.015

Sun, S, Schefuß, E, Mulitza, S, Chiessi, CM, Sawakuchi, AO, Zabel, M, Baker, PA, Hefter, J and Mollenhauer, G (2017) Origin and processing of terrestrial organic carbon in the Amazon system: lignin phenols in river, shelf, and fan sediments. Biogeosciences, 14(9). 2495-2512. doi:10.5194/bg-14-2495-2017

Meyer, VD, Hefter, J, Lohmann, G, Max, L, Tiedemann, R and Mollenhauer, G (2017) Summer temperature evolution on the Kamchatka Peninsula, Russian Far East, during the past 20 000 years. Climate of the Past, 13(4). 359-377. doi:10.5194/cp-13-359-2017

Jaeschke, A, Wengler, M, Hefter, J, Ronge, TA, Geibert, W, Mollenhauer, G, Gersonde, R and Lamy, F (2017) A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean. Geochimica et Cosmochimica Acta, 204. 120-139. doi:10.1016/j.gca.2017.01.045

Fischer, G, Karstensen, J, Romero, OE, Baumann, KH, Donner, B, Hefter, J, Mollenhauer, G, Iversen, MH, Fiedler, B, Monteiro, I and Körtzinger, A (2016) Bathypelagic particle flux signatures from a suboxic eddy in the oligotrophic tropical North Atlantic: production, sedimentation and preservation. Biogeosciences, 13(11). 3203-3223. doi:10.5194/bg-13-3203-2016

Meyer, VD, Max, L, Hefter, J, Tiedemann, R and Mollenhauer, G (2016) Glacial-to-Holocene evolution of sea surface temperature and surface circulation in the subarctic northwest Pacific and the Western Bering Sea. Paleoceanography, 31(7). 916-927. doi:10.1002/2015PA002877

Hockun, K, Mollenhauer, G, Ho, SL, Hefter, J, Ohlendorf, C, Zolitschka, B, Mayr, C, Lücke, A and Schefuß, E (2016) Using distributions and stable isotopes of n-alkanes to disentangle organic matter contributions to sediments of Laguna Potrok Aike, Argentina. Organic Geochemistry, 102. 110-119. doi:10.1016/j.orggeochem.2016.10.001

Winterfeld, M, Goñi, MA, Just, J, Hefter, J and Mollenhauer, G (2015) Characterization of particulate organic matter in the Lena River delta and adjacent nearshore zone, NE Siberia – Part 2: Lignin-derived phenol compositions. Biogeosciences, 12(7). 2261-2283. doi:10.5194/bg-12-2261-2015

Kaiser, J, Ruggieri, N, Hefter, J, Siegel, H, Mollenhauer, G, Arz, HW and Lamy, F (2014) Lipid biomarkers in surface sediments from the Gulf of Genoa, Ligurian sea (NW Mediterranean sea) and their potential for the reconstruction of palaeo-environments. Deep Sea Research Part I: Oceanographic Research Papers, 89. 68-83. doi:10.1016/j.dsr.2014.04.009

Fischer, G, Dehning, K, Dia, A, Füssel, J, Hefter, J, Iversen, MH, Klann, M, Nowald, N, Olbrich, M and Ruhland, G (2014) Report and preliminary results of R/V POSEIDON cruise POS464, Las Palmas (Canary Islands) - Las Palmas (Canary Islands), 03.02.2014 - 18.02.2014. Berichte, MARUM – Zentrum für Marine Umweltwissenschaften, Fachbereich Geowissenschaften, Universität Bremen, 304. urn:nbn:de:gbv:46-00103963-17

Fischer, G, Ba, M, Dehning, K, Hefter, J, Iversen, MH, Klann, M, Nowald, N, Ploug, H, Ruhland, G and Witte, Y (2013) Report and preliminary results of R/V POSEIDON cruise POS445. Las Palmas – Las Palmas, 19.01.2013 – 01.02.2013. Berichte, MARUM - Zentrum für Marine Umweltwissenschaften, Fachbereich Geowissenschaften, Universität Bremen, 298. 1-30. urn:nbn:de:gbv:46-00103379-13

Naafs, BDA, Stein, R, Hefter, J, Khélifi, N, De Schepper, S and Haug, GH (2010) Late Pliocene changes in the North Atlantic Current. Earth and Planetary Science Letters, 298(3-4). 434-442. doi:10.1016/j.epsl.2010.08.023

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(3-4). 127-160. doi:10.1016/j.marchem.2004.03.006