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- Igor Obreht
Dr. Igor Obreht |
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Postdocs |
Group: |
Organic Geochemistry |
Phone: |
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Email: |
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Room: |
MARUM I, 2710 |
Research Interest
- Mass Spectrometry Imaging (MSI) on sediments
- High-resolution paleoclimate reconstruction from marine, lacustrine and eolian/loess sediments
- Geochemistry (lipid biomarker and elemental composition)
- Sedimentology and stratigraphy
Education and working experiance
MARUM, University of Bremen, Germany (2018 – present)
Postdoc
PhD, Geosciences (2014-2017)
RWTH Aachen University, Aachen, Germany
MSc, Geography-geoecology (2012-2013)
University of Novi Sad, Faculty of Science, Novi Sad, Serbia
BSc, Geography teaching (2008-2012)
University of Novi Sad, Faculty of Science, Novi Sad, Serbia
Third party funding
2021-2023: Temporary positions for principal Investigators - Funding Agency: Deutsche Forschungsgemeinschaft (DFG)
Title: Micrometer-scale biomarker and elemental imaging on sediments from the northeastern Arabian Sea – reconstruction of the Indian monsoon evolution on a sub-decadal scale in the Holocene and the Bølling-Allerød interstadial
Summary:
The Indian monsoon is one of the most important large-scale coupled land-ocean-atmosphere phenomena in the low latitudes. However, the forcing mechanisms of the decadal-scale monsoon variability are not well understood because knowledge of short-term climate oscillations is mostly limited to periods covered by instrumental records. Understanding of the short-scale climate evolution in the more distant past is hampered by the small number of records that preserve undisturbed signals and by methodological limitations to obtain highly resolved records. However, recent developments that interrogate laminated sediments with novel imaging techniques showed great potential to overcome these limitations. In order to reveal subdecadal-scale paleoclimate evolution of the tropics, I will apply biomarker and elemental imaging on finely laminated sediment sections from the Arabian Sea spanning the major part of Holocene (from 11.7-2 ka) and Bølling-Allerød interstadial (B-A; 14.7-12.9 ka). The goal of this project is to explore the interplay of the Intertropical Convergence Zone (ITCZ), Indian monsoon intensity and related environmental responses on the subdecadal and decadal-scale during the Holocene and B-A.
Teaching Experience
(Co)supervised theses
Devika Varma – MSc thesis ”High-resolution multi-proxy analysis on palaeoclimatic changes in the Eastern Mediterranean during the Last Interglacial” (2019)
Janina Groninga – BSc thesis ”Hochauflösende Einblicke in die Verteilung von Lipidbiomarkern in einem bioturbierten Sedimentkern vor Mauretanien über das Mass Spectrometry Imaging“ (2019)
Other supervision duties
Supervision of two students in month-long fieldwork in the loess region of Romania in 2016 – explaining the formation of loess and other aeolian sediments, establishing stratigraphy, teaching sampling strategy, etc.
Marit Paul - supervision of the pupil competing at the Jugend forscht – won the first place in the category „Geo- und Raumwissenschaften“ at the level of Bremen in 2019.
Publications
2022
Obreht, I., De Vleeschouwer, D., Wörmer, L., Kucera, M., Varma, D., Prange, M., Laepple, T., Wendt, J., Nadini-Weiss, S., Schulz, H., Hinrichs, K.U., 2022. Last Interglacial decadal sea surface temperature variability in the Eastern Mediterranean. Nature Geoscience 15, 812-818. DOI:10.1038/s41561-022-01016-y
Perić, Z., Stevens, T., Obreht, I., Hambach, U., Lehmkuhl, L., Marković, S.B., 2022. Detailed luminescence dating of dust mass accumulation rates over the last two glacial-interglacial cycles from the Irig loess-palaeosol sequence, Carpathian Basin. Global and Planetary Change 215, 103895. DOI:10.1016/j.gloplacha.2022.103895
Perić, Z., Stevens, T., Obreht, I., Marković, S.B., 2022. Dataset of dust mass accumulation rates for the loess-palaeosol sequences from the Carpathian Basin. Data in Brief 44, 108555. DOI: 10.1016/j.dib.2022.108555
2021
Zeeden, C., Hambach, U., Klasen, N., Fischer, P., Schulte, P., Nett, J.J., Veres, D., Obreht, I., Chu, W., Papadopoulou, M., Viehberg, F., Schäbitz, F., Gavrilov, M.B., Marković, S.B., Vött, A., Lehmkuhl, F., 2021. Sedimentology of a Late Quaternary lacustrine record from the south-eastern Carpathian Basin. Journal of Quaternary Science. DOI: 10.1002/jqs.3297
Lehmkuhl, F., Nett, J. J., Pötter, S., Schulte, P., Sprafke, T., Jary, Z., Antoine, P., Wacha, L., Wolf, D., Zerboni, A., Hošek, J., Marković, S.B., Obreht, I., Sümegi, P., Veres, D., Zeeden, C., Boemke, B., Schaubert, V., Viehweger, J., Hambach, U., 2021. Loess landscapes of Europe – Mapping, geomorphology, and zonal differentiation. Earth-Science Reviews 215, 103496. DOI:10.1016/j.earscirev.2020.103496
Nett, J.J., Chu, W., Fischer, P., Hambach, U., Klasen, N., Zeeden, C., Obreht, I., Obrocki, L., Pötter, S., Gavrilov, M.B., Vött, A., Mihailović, D., Marković, S.B., Lehmkuhl, F., accepted. The early Upper Paleolithic site Crvenka-At, Serbia – the first Aurignacian lowland occupation site in the southern Carpathian Basin. Frontiers in Earth Science 9, 599986. DOI: 10.3389/feart.2021.599986
Palanački Malešević, T., Dulić, T., Obreht, I., Trivunović, Z., Marković, R., Kostić, B., Važić, T., Meriluoto, J., Svirčev, Z., 2021. Cyanobacterial potential for restoration of loess surfaces through artificially induced biocrusts. Applied Sciences, 11(1), 66. DOI:10.3390/app11010066
Pötter, S., Schmitz, A., Lücke, A., Schulte, P., Obreht, I., Zech, M., Wissel, H., Marković, S.B., Lehmkuhl, F., 2021. Middle to Late Pleistocene environments based on stable organic carbon and nitrogen isotopes of loess-palaeosol sequences from the Carpathian Basin. Boreas, 50(1), 184–204. DOI:10.1111/bor.12470
Obreht, I., Zeeden, C., Hambach, U., Veres, D., Marković, S.B., Lehmkuhl, F., 2021. Reply to the discussion paper by P. Sümegi and S. Gulyás: Some notes on the interpretation and reliability of malacological proxies in paleotemperature reconstructions from loess- comments to Obreht et al.'s “A critical reevaluation of paleoclimate proxy records from loess in the Carpathian Basin”. Earth-Science Reviews, 103737. DOI: 10.1016/j.earscirev.2021.103737
2020
Obreht, I., Wörmer, L., Brauer, A., Wendt, J., Alfken, S., De Vleeschouwer, D., Elvert, M., Hinrichs, K.U., 2020. An annually resolved record of Western European vegetation response to Younger Dryas cooling. Quaternary Science Reviews 231, 106198. DOI:10.1016/j.quascirev.2020.106198
Zeeden, C., Obreht, I., Veres, D., Kaboth-Bahr, S., Hošek, J., Marković, S.B., Bösken, J., Lehmkuhl, F., Rolf, C., Hambach, U., 2020. Smoothed millennial-scale palaeoclimatic reference data as unconventional comparison targets: Application to European loess records. Scientific Reports 10, 5455. DOI:10.1038/s41598-020-61528-8
Avram, A., Constantin, D., Veres, D., Kelemen, S., Obreht, I., Hambach, U., Marković, S.B., Timar‐Gabor, A., 2020. Testing polymineral post-IR IRSL and quartz SAR-OSL protocols on Middle to Late Pleistocene loess at Batajnica, Serbia. Boreas, 49(3), 615–633. DOI:10.1111/bor.12442
Kharbush, J. J., Close, H. G., Van Mooy, B. A. S., Arnosti, C., Smittenberg, R. H., Le Moigne, F. A. C., Mollenhauer, G., Scholz-Böttcher, B., Obreht, I., Koch, B.P., Becker, K.W., Iversen, M.H., Mohr, W., 2020. Particulate organic carbon deconstructed: Molecular and chemical composition of particulate organic carbon in the ocean. Frontiers in Marine Science, 7. DOI:10.3389/fmars.2020.00518
Marković, S. B., Vandenberghe, J., Stevens, T., Mihailović, D., Gavrilov, M. B., Radaković, M. G., Zeeden, C., Obreht, I., Perić, Z.M., Nett, J.J., Lehmkuhl, F., 2020. Geomorphological evolution of the Petrovaradin Fortress Palaeolithic site (Novi Sad, Serbia). Quaternary Research, 1–14. DOI:10.1017/qua.2020.88
2019
Obreht, I., Zeeden, C., Hambach, U., Veres, D., Marković, S.B., Lehmkuhl, F., 2019. A critical reevaluation of palaeoclimate proxy records from loess in the Carpathian Basin. Earth-Science Reviews 190, 498-520. DOI:10.1016/j.earscirev.2019.01.020.
Bösken, J., Obreht, I., Zeeden, C., Klasen, N., Hambach, U., Sümegi, P., Lehmkuhl, F., 2019. High-resolution paleoclimatic proxy data from the MIS3/2 transition recorded in northeastern Hungarian loess. Quaternary International 502, 95-107. DOI:10.1016/j.quaint.2017.12.008
Perić, Z., Adophi, EL, Buylaert, JP., Stevens, T., Újvári, G., Marković, S.B., Hambach, U., Fischer, P., Zeeden, C., Schmidt, C., Schulte, P., Huayu, L., Shuangwen, Y., Lehmkuhl, L.,Obreht, I., Veres, D., Vött, A., Zöller, L., 2019. Quartz OSL dating of late quaternary Chinese and Serbian loess: A cross Eurasian comparison of dust mass accumulation rates. Quaternary International 502, 30-44. DOI:10.1016/j.quaint.2018.01.010
Svirčev, Z., Dulić, T., Obreht, I., Codd, G., Lehmkuhl, F., Marković, S.B., Hambach, U., Meriluoto, J., 2019. Cyanobacteria and loess-an underestimated interaction. Plant and Soil, 439, 293-308. DOI:10.1007/s11104-019-04048-3
2018
Smalley, I., Obreht, I., 2018. The formation of loess ground by the process of loessification: a history of the concept. Geologos 24, 163-170. DOI:10.2478/logos-2018-0015
Lehmkuhl, F., Bösken, J., Hošek, J., Sprafke, T., Marković, S.B., Obreht, I., Hambach, U., Sümegi, P., Thiemann, A., Steffens, S., Lindner, H., Veres, D., Zeeden, C., 2018. Loess distribution and related Quaternary sediments in the Carpathian Basin. Journal of Maps 14, 673-682. DOI:10.1080/17445647.2018.1526720
Marković, SB., Sümegi, P., Stevens, T., Schaetzl, R.J., Obreht, I., Chu, W., Buggle, B., Zech, M., Zech, R., Zeeden, C., Gavrilov, M.B., Perić, Z., Svirčev, Z., Lehmkuhl, F., 2018. The Crvenka loess-paleosol sequence: A record of continuous grassland domination in the southern Carpathian Basin during the Late Pleistocene. Palaeogeography, Palaeoclimatology, Palaeoecology 509, 33-46. DOI:10.1016/j.palaeo.2018.03.019
Marković, S.B., Stevens, T., Mason, J.A., Vandenberghe, J., Yang, S., Veres, D., Újvári, G., Timar-Gabor, A., Zeeden, C., Guo, Z., Hao, Q., Obreht, I., Hambach, I., Wu, H., Gavrilov, M.B., Rolf, C., Tomić, N., Lehmkuhl, F., 2018. Loess correlations – Between myth and reality. Palaeogeography, Palaeoclimatology, Palaeoecology 509, 4-23. DOI:10.1016/j.palaeo.2018.04.018
Zeeden, C., Hambach, U., Veres, D., Fitzsimmons, K., Obreht, I., Bösken, J., Schulte, P., Lehmkuhl, F., 2018. Millennial-scale climate oscillations recorded in the Lower Danube loess: high resolution correlative age models constrained by Campanian Ignimbrite tephra and luminescence dating. Palaeogeography, Palaeoclimatology, Palaeoecology 509, 164-181. DOI:10.1016/j.palaeo.2016.12.029
Schaetzl, R.J., Bettis, E.A., Crouvi, O., Fitzsimmons, K.E., Grimley, D.A., Hambach, U., Lehmkuhl, F., Marković, S.B., Mason, J.A., Owczarek, P., Roberts, H.M., Rousseau, D.-D., Stevens, T., Vandenberghe, J., Zárate, M., Veres, D., Yang, S., Zech, M., Conroy, J.L., Dave, A.K., Faust, D., Hao, Q., Obreht, I.,Prud’homme, C., Smalley, I., Tripaldi, A., Zeeden, C., Zech, R., 2018. Approaches and challenges to the study of loess—Introduction to the LoessFest Special Issue. Quaternary Research 89, 563-618. DOI:10.1017/qua.2018.15
Gavrilov, M.B., Marković, S.B., Schaetz, R.J., Tošić, I., Zeeden, C., Obreht, I., Sipos, G., Ruman, A., Putniković, S, Emunds, K., Perić, Z., Lehmkuhl., F., 2018. Prevailing surface winds in Northern Serbia in the recent and past time periods. Aeolian Research 31, 117-129. DOI:10.1016/j.aeolia.2017.07.008
Zeeden, C., Hambach, U., Obreht, I., Hao, Q., Abels, H., Veres, D., Lehmkuhl, F., Gavrilov, M., Marković., 2018. Patterns and timing of loess-palaeosol transitions in Eurasia: constraints for palaeoclimate studies. Global and Planetary Change 162, 1-7. DOI:10.1016/j.gloplacha.2017.12.021
2017
Obreht, I., Hambach, U., Veres, D., Zeeden, C., Bösken, J., Stevens, T., Marković, S.B., Klasen, N., Brill, D., Burow, C., Lehmkuhl, F., 2017. Shift of large-scale atmospheric systems over Europe during late MIS 3 and implications for Modern Human dispersal. Scientific Reports 7, 5848. DOI:10.1038/s41598-017-06285-x
Bösken, J., Klasen, N., Zeeden, C., Obreht, I., Marković, S.B., Hambach, U., Lehmkuhl, F., 2017. New luminescence-based geochronology framing the last two glacial cycles at the southern limit of European Pleistocene loess in Stalać (Serbia). Geochronometria 44, 150-161. DOI:10.1515/geochr-2015-0062
Dulić, T., Meriluoto, J., Palanački Malešević, T., Gajić, V., Važić, T., Tokodi, N., Obreht, I., Kostić, B., Kosijer, P., Khormali, F., Svirčev, Z., 2017. Cyanobacterial diversity and toxicity of biocrusts from the Caspian Lowland loess deposits, North Iran. Quaternary International 429, 74-85. DOI:10.1016/j.quaint.2016.02.046
2016
Obreht, I., Zeeden, C., Hambach, U., Veres, D., Marković, S.B., Bösken, J., Svirčev, Z., Bačević, N., Gavrilov, M.B., Lehmkuhl, F., 2016. Tracing the influence of Mediterranean climate on Southeast Europe during the past 350,000 years. Scientific Reports 6, 36334.DOI:10.1038/srep36334
Sprafke, T., Obreht, I., 2016. Loess: Rock, sediment or soil – What is missing for its definition? Quaternary International 399, 198-207. DOI:10.1016/j.quaint.2015.03.033
Svirčev, Z., Nikolić, B., Vukić, V., Marković, S.B., Gavrilov, M.B, Smalley, I., Obreht, I., Vukotić, B., Meriluoto, J., 2016. Loess and life out of Earth? Quaternary International 399, 208-217. DOI:10.1016/j.quaint.2015.09.057
2015
Obreht, I., Zeeden, C., Schulte, P., Hambach, U., Eckmeier, E., Timar-Gabor, A., Lehmkuhl, F., 2015. Aeolian dynamics at the Orlovat loess-paleosol sequence, northern Serbia, based on detailed textural and geochemical evidence. Aeolian Research 18, 69-81. DOI:10.1016/j.aeolia.2015.06.004
Važić, T., Svirčev, Z., Dulić, T., Krstić, K., Obreht, I., 2015. Potential for energy production from reed biomass in the Vojvodina region (north Serbia). Renewable and Sustainable Energy Reviews 48, 670-680. DOI:10.1016/j.rser.2015.04.034
2014
Obreht, I., Buggle, B., Catto, N., Marković, S.B., Bösel, S., Vandenberghe, D.A.G., Hambach, U., Svirčev, Z., Lehmkuhl, F., Basarin, B., Gavrilov, M.B., Jović, G., 2014. The Late Pleistocene Belotinac section (southern Serbia) at the southern limit of the European loess belt: Environmental and climate reconstruction using grain size and stable C and N isotopes. Quaternary International 334-335, 10-19. DOI:10.1016/j.quaint.2013.05.037
Marković, S.B, Timar-Gabor, A., Stevens, T., Hambach, U., Popov, D., Tomić, N., Obreht, I., Lehmkuhl, F., Kels, H., Marković, R., Gavrilov, M.B., 2014. Environmental dynamics and luminescence chronology from the Orlovat loess-palaeosol sequence (Vojvodina, Northern Serbia). Journal of Quaternary Science, 29, 189-199. DOI:10.1002/jqs.2693
Marković, S.B., Korać, M., Mrđić, N., Buylaert, J.P., Thiel, C., McLaren, S.J., Stevens, T., Tomić, N., Petić, N., Jovanović, M., Vasiljević, Dj.A., Sümegi, P., Gavrilov, M.B., Obreht, I., 2014. Palaeoenvironment and geoconservation of mammoths from the Nosak loess–palaeosol sequence (Drmno, northeastern Serbia): Initial results and perspectives. Quaternary International 334-335, 30-39. DOI:10.1016/j.quaint.2013.05.047
2013
Svirčev, Z., Marković, S.B., Stevens, T., Codd, G., Smalley, I., Simeunović, J., Obreht, I., Dulić, T., Pantelić, D., Hambach, U., 2013. Importance of Biological Loess Crusts for Loess Formation in Semi-Arid Environments. Quaternary International 296, 206-215. DOI:10.1016/j.quaint.2012.10.048
2012
Krstić, S., Zech, W., Obreht, I., Svirčev, Z., Marković, S.B., 2012. Late Quaternary environmental changes in Helambu Himal, Central Nepal, recorded in the diatom flora assemblage composition and geochemistry of Lake Panch Pokhari. Journal of Paleolimnology 47, 113–124. DOI:10.1007/s10933-011-9563-4
2009
Lukić, T., Marković, S.B., Stevens, T., Vasiljević, Dj.A., Machalett, B., Milivojević, N., Basarin, B., Obreht, I., 2009. The loess “cave” near the Village of Surduk – An unusual pseudokarst landform in the loess of Vojvodina, Serbia, Acta Carsologica 38, 227-235. DOI:10.3986/ac.v38i2-3.124