Page path:
  • Home
  • Mahyar Mohtadi

PD Dr. Mahyar Mohtadi


Low Latitude Climate Variability


+49 421 218-65660


+49 421 218-65505



MARUM II, Raum 3100

Mahyar Mohtadi

Research Interests

I have been reconstructing the ocean circulation and the hydrological cycle of the Indo‐Pacific tropics to subtropics from marine sedimentary archives combined with model simulations. The body of my research activities is devoted to the hydroclimate of the Pacific and Indian Ocean realms by studying the long‐term evolution of, and the interaction between, the coupled atmosphere‐ocean climate phenomena inherent to these basins such as the Australasian monsoon systems, the Indian Ocean Dipole, and El Niño‐Southern Oscillation. I make use of various proxies and models to understand past dynamic and thermodynamic changes of the hydrological cycle: ocean circulation and thermal structure of the water column, salinity, terrestrial vegetation, rainfall, and runoff, as well as atmospheric zonal and meridional circulations. A major focus of my research is the interaction between anthropogenic and natural climate forcing within the Australasian monsoon domains. Another focus is investigating the causes and effects of temperature and CO2rise during the last deglaciation.

Completed projects:

BMBF: PUCK (2001-2003), PABESIA (2005-2007), SUMATRA (2006-2007), CHIMEBO (2010-2012), CARIMA (2011-2014), INVERS (2012-2014), TransGeoBiOc (2012-2013), SIODP (2013-2014), EISPAC (2013-2015), SPICE III (2013-2016), WESTWIND (2013-2016), CAHOL (2016-2019), TACTEAC (2017-2019)

DFG: ENSO-IOD-Monsoon(2008-2011), MARUM-Excellence Cluster (2007-2011), MARUM-Center of Excellence (2012-2018),BASE-ITF (2021-2023)

MoST: Banda Sea (2019-2021)

Running: MARUM-Center of Excellence (DFG, 2019-2025), HENWAC (NSFC, 2020-2024), INDOCRISIS (DFG, 2023-2025)

Accepted: SAMOVAR (BMBF, 2 years, TBD)

Gravity corer sampling on deck
© Courtesy of Philipp Munz
Multi-corer sediment Surface
© Courtesy of Philipp Munz



Lu, F, Pausata, FSR, Mohtadi, M (2024). Reconstruct the intertropical convergence zone over the Indo-Pacific Warm Pool with extended records and empirical orthogonal function. Proceedings of the National Academy of Sciences, 121(27), e2408502121. doi:10.1073/pnas.2408502121

Hollstein, M, Kie­n­ast, M, Lück­ge, A, Yo­koyama, Y, Mohtadi, M (2024). Sea surface temperatures across the Coral Sea over the last glacial-interglacial cycle. Pa­leo­cea­no­gra­phy and Pa­leo­cli­ma­to­lo­gy 39(5), e2023PA004757, doi:10.1029/2023PA004757

Mohtadi, M, Abram, NJ., Clemens, SC, Pfeiffer, M, Russell, JM, Steinke, S, & Zinke, J (2024). Paleoclimate evidence of Indian Ocean variability across a range of timescales. In CC Ummenhofer & RR Hood (Eds.), The Indian Ocean and its Role in the Global Climate System (pp. 445-467): Elsevier, doi:10.1016/B978-0-12-822698-8.00007-X

Clift, P, Du, Y, Mohtadi, M, Pahnke, K, Sutorius, M, Böning, P (2024). The erosional and weathering response to arc-continent collision in New Guinea. Journal of the Geological Society, doi:10.1144/jgs2023-207


Huang, Z, Chen, A, Mii, H-S, Mohtadi, M, Steinke, S (2023). Calcification depth of pteropods in the Coral Sea using stable oxygen isotopes. Marine Micropaleontology, doi:10.1016/j.marmicro.2023.102322

Zhuravleva, A, Bauch, H, Mohtadi, M, Fahl, K, Kienast, M (2023). Caribbean salinity anomalies contributed to variable North Atlantic circulation and climate during the Common Era. Science Advances 9 (44), doi:10.1126/sciadv.adg2639

Gaviria Lugo, N, Läuchli, C, Wittmann, H, Bernhard, A, Frings, P, Mohtadi, M, Rach, O, Sachse, D (2023). Climatic controls on leaf wax hydrogen isotope ratios in terrestrial and marine sediments along a hyperarid to humid gradient.Biogeosciences 20 (21), doi:10.5194/bg-20-4433-2023.

Bagherpour, B, Nkemata, AF, Vaziri-Moghaddam, H, Blattmann, TM, Mohtadi, M (2023). Paleoenvironmental significance of the carbon isotope record across the Cenomanian-Turonian transition and the Oceanic Anoxic Event 2 (OAE2) in the southeastern Neotethys, Zagros, Iran. Cretaceous Research 150, 105574, doi:10.1016/j.cretres.2023.105574

Saraswat, R, Suokhrie, T, Naik, DK, Singh, DP, Saalim, SM, Salman, M, Kumar, G, Bhadra, SR, Mohtadi, M, Kurtarkar, SR, Maurya, AS (2023). Large salinity gradient and diagenetic changes in the northern Indian Ocean dominate the stable oxygen isotopic variation in Globigerinoides ruber, Earth System Science Data, doi:10.5194/essd-2022-107

Du, X, Russell, JM, Liu, Z, Otto-Bliesner, BL, Oppo, DW, Mohtadi, M, Zhu, C, Galy, VV, Schefuß, E, Yan, Y, Rosenthal, Y, Dubois, N, Arbuszewski, J, Gau, Y (2023). North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1. Science Advances 9(1), doi:10.1126/sciadv.add4909


Zhai, R, Mohtadi, M, Dolman, AM, Yokoyama, Y, Steinke, S (2022).Intensification of the East Australian Current after ~1400 CE. Geophysical Research Letters 49(24), doi:10.1029/2022GL100945

Jian, Z, Wang, Y, Dang, H, Mohtadi, M, Rosenthal, Y, Lea, DW, Liu, Z, Jin, H, Ye, L, Kuhnt, W, Wang, X (2022).Warm pool ocean heat content regulates ocean-continent moisture transport. Nature 612, 92–99, doi:10.1038/s41586-022-05302-y

Tapia, R, Ho, SL, Wang, HY, Groeneveld, J, Mohtadi, M (2022). Contrasting vertical distributions of recent planktic foraminifera off Indonesia during the southeast monsoon: implications for paleoceanographic reconstructions. Biogeosciences 19, 3185-3208, doi:10.5194/bg-19-3185-2022

Mulitza, S, Bickert, T, Bostock, HC, Chiessi, CM, Donner, B, Govin, A, Harada, N, Huang, E, Johnstone, H, Kuhnert, H, Langner, M, Lamy, F, Lembke-Jene, L, Lisiecki, L, Lynch-Stieglitz, J, Max, L, Mohtadi, M, Mollenhauer, G, Muglia, J, Nürnberg, D, Paul, A, Rühlemann, C, Repschläger, J, Saraswat, R, Schmittner, A, Sikes, EL, Spielhagen, RF, Tiedemann, R (2022).World Atlas of late Quaternary Foraminiferal Oxygen and Carbon Isotope Ratios. Earth System Science Data, 14(6), 2553-2611, doi:10.5194/essd-14-2553-2022

Reyes-Macaya, DA, Hoogakker, B, Martínez-Méndez, G, Llanillo, P, Grasse, P, Mohtadi, M, et al. (2022). Isotopic characterization of water masses in the Southeast Pacific region: Paleoceanographic implications. Journal of Geophysical Research-Oceans, doi:10.1029/2021JC017525

Singh, DP, Saraswat, R, Mohtadi, M, Kumar, P (2022). Warm northern tropical Indian Ocean strengthened the ocean circulation prior to the last glacial termination. Global and Planetary Change, 103733, doi:10.1016/j.gloplacha.2021.103733


Cheng, Z, Weng, C, Steinke, S, Mohtadi, M (2021). Marine pollen records provide perspective on coastal wetlands through Quaternary sea-level changes. Ecological Indicators 133, 108405, doi:10.1016/j.ecolind.2021.108405

Mohtadi, M, Lückge, A, Steinke, S, Permana, H, Susilohadi, S, Zuraida, R, Jennerjahn, TC (2021). Late Quaternary environmental history of Indonesia. In: Jennerjahn, TC, Rixen, T, Irianto, HE, Samiaji, J (Eds.), Science for the Protection of Indonesian Coastal Ecosystems (SPICE). Elsevier, Amsterdam, doi:10.1016/B978-0-12-815050-4.00012-2

Du, X, Russel, JM, Liu, Z, Otto-Bliesner, BL, Gao, Y, Zhu, C, Oppo, DW, Mohtadi, M, Yan, Y, Galy, VV, He, C (2021). Deglacial trends in Indo-Pacific Warm Pool hydroclimate in an isotope-enabled earth system model and implications for isotope-based paleoclimate reconstructions. Quaternary Science Reviews 270, doi:10.1016/j.quascirev.2021.107188

Shao, J, Stott, LD, Menviel, L, Ridgwell, A, Ödalen, M, Mohtadi, M (2021). The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean. Climate of the Past, 17(4), 1507-1521, doi:10.5194/cp-17-1507-2021


Ruan, Y, Mohtadi, M, Dupont, LM, Hebbeln, D, van der Kaars, S, Hopmans, EC, Schouten, S, Hyer, EJ, Schefuß, E (2020). Interaction of fire, vegetation and climate in tropical ecosystems: a multi-proxy study over the past 22,000 years.Global Biogeochemical Cycles, doi:10.1029/2020GB006677

Dang, H, Jian, Z, Wang, Y, Mohtadi, M, Rosenthal, Y, Ye, L, Bassinot, F, Kuhnt, W (2020). Pacific warm pool subsurface heat sequestration modulated Walker Circulation and ENSO activity during the Holocene.Science Advances, 6, doi:10.1126/sciadv.abc0402

Safaierad, R, Mohtadi, M, Zolitschka, B, Yokoyama, Y, Vogt, C, Schefuß, E (2020). Elevated dust depositions in West Asia linked to ocean–atmosphere shifts during North Atlantic cold events.Proceedings of the National Academy of Sciences, 202004071, doi:10.1073/pnas.2004071117

Hollstein, M, Mohtadi, M, Kienast, M, Rosenthal, Y, Groeneveld, J, Oppo, DW, Southon, JR, Lückge, A (2020). The impact of astronomical forcing on surface and thermocline variability within the Western Pacific Warm Pool over the past 160 kyr.Paleoceanography and Paleoclimatology, 35, doi:10.1029/2019PA003832

Bernhardt, A, Oelze, M, Bouchez, J, von Blanckenburg, F, Mohtadi, M, Christl, M, Wittmann, H (2020). 10Be/9Be ratios reveal marine authigenic clay formation.Geophysical Research Letters, 47(4), doi:10.1029/2019GL086061

Chen, Y, Huang, E, Schefuß, E, Mohtadi, M, Steinke, S, Liu, JJ, Martínez-Méndez, G, Tian, J (2020). Wetland expansion on the continental shelf of the northern South China Sea during deglacial sea level rise.Quaternary Science Reviews, 231. 106202, doi:10.1016/j.quascirev.2020.106202


Groeneveld, J, Ho, SL, Mackensen, A, Mohtadi, M, Laepple, T (2019). Deciphering the variability in Mg/Ca and stable oxygen isotopes of individual foraminifera.Paleoceanography and Paleoclimatology, doi:10.1029/2018PA003533

Ruan, Y, Mohtadi, M, van der Kaars, S, Dupont, LM, Hebbeln, D, Schefuß, E (2019). Differential hydro-climatic evolution of East Javanese ecosystems over the past 22,000 years.Quaternary Science Reviews, 218. 49-60, doi:10.1016/j.quascirev.2019.06.015

Servettaz, APM, Yokoyama, Y, Hirabayashi, S, Kienast, M, Miyairi, Y, Mohtadi, M (2019). Dissolved inorganic radiocarbon content of the western Coral Sea: implications for intermediate and deep water circulation.Radiocarbon, 61(6). 1685-1696, doi:10.1017/RDC.2019.122

Thirumalai, K, DiNezio, PN, Tierney, JE, Puy, M, Mohtadi, M (2019). An El Niño mode in the glacial Indian Ocean?Paleoceanography and Paleoclimatology, 34(8). 1316-1327, doi:10.1029/2019PA003669

Contreras-Rosales, LA, Jennerjahn, T, Steinke, S, Mohtadi, M, Schefuß, E (2019). Holocene changes in biome size and tropical cyclone activity around the Northern South China Sea.Quaternary Science Reviews, 215. 45-63, doi:10.1016/j.quascirev.2019.05.004

Moffa‐Sanchez, P, Rosenthal, Y, Babila, TL, Mohtadi, M, Zhang, X (2019). Temperature evolution of the Indo‐Pacific Warm Pool over the Holocene and the last deglaciation.Paleoceanography and Paleoclimatology, 34(7). 1107-1123, doi:10.1029/2018PA003455

Martínez Fontaine, C, De Pol‐Holz, R, Michel, E, Siani, G, Reyes‐Macaya, D, Martínez‐Méndez, G, DeVries, T, Stott, L, Southon, J, Mohtadi, M, Hebbeln, D (2019). Ventilation of the deep ocean carbon reservoir during the last deglaciation: results from the Southeast Pacific.Paleoceanography and Paleoclimatology, doi:10.1029/2019PA003613

Karami, MP, Mohtadi, M, Zhang, Q, Koenigk, T (2019). West Asian climate during the last millennium according to EC-Earth model.Canadian Journal of Earth Sciences, doi:10.1139/cjes-2018-0216


Cheng, Z, Weng, C, Steinke, S, Mohtadi, M (2018). Anthropogenic modification of vegetated landscapes in southern China from 6,000 years ago.Nature Geoscience, 11(12). 939-943, doi:10.1038/s41561-018-0250-1PANGAEA Supplementary Data

Lehmann, N, Granger, J, Kienast, M, Brown, KS, Rafter, PA, Martínez-Méndez, G, Mohtadi, M (2018). Isotopic evidence for the evolution of subsurface nitrate in the Western Equatorial Pacific.Journal of Geophysical Research: Oceans, 123(3). 1684-1707, doi:10.1002/2017JC013527PANGAEA Supplementary Data

Huang, E, Chen, Y, Schefuß, E, Steinke, S, Liu, JJ, Tian, J, Martínez-Méndez, G, Mohtadi, M (2018). Precession and glacial-cycle controls of monsoon precipitation isotope changes over East Asia during the Pleistocene.Earth and Planetary Science Letters, 494. 1-11, doi:10.1016/j.epsl.2018.04.046PANGAEA Supplementary Data

Wang, X, Jian, Z, Lückge, A, Wang, Y, Dang, H, Mohtadi, M (2018). Precession-paced thermocline water temperature changes in response to upwelling conditions off southern Sumatra over the past 300,000 years.Quaternary Science Reviews, 192. 123-134, doi:10.1016/j.quascirev.2018.05.035PANGAEA Supplementary Data

Hollstein, M, Mohtadi, M, Rosenthal, Y, Prange, M, Oppo, DW, Martínez Méndez, G, Tachikawa, K, Moffa Sanchez, P, Steinke, S, Hebbeln, D (2018). Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation.Quaternary Science Reviews, 201. 429-445, doi:10.1016/j.quascirev.2018.10.030PANGAEA Supplementary Data


Panmei, C, Divakar Naidu, P, Mohtadi, M (2017). Bay of Bengal exhibits warming trend during the Younger Dryas: Implications of AMOC.Geochemistry, Geophysics, Geosystems, 18(12). 4317-4325, doi:10.1002/2017GC007075

Mohtadi, M, Prange, M, Schefuß, E, Jennerjahn, TC (2017). Late Holocene slowdown of the Indian Ocean Walker circulation.Nature Communications, 8(1), doi:10.1038/s41467-017-00855-3

Hollstein, M, Mohtadi, M, Rosenthal, Y, Moffa Sanchez, P, Oppo, D, Martínez Méndez, G, Steinke, S, Hebbeln, D (2017). Stable oxygen isotopes and Mg/Ca in planktic foraminifera from modern surface sediments of the Western Pacific Warm Pool: implications for thermocline reconstructions.Paleoceanography, 32(11). 1174-1194, doi:10.1002/2017PA003122PANGAEA Supplementary Data

Liu, J, Steinke, S, Vogt, C, Mohtadi, M, de Pol-Holz, R, Hebbeln, D (2017). Temporal and spatial patterns of sediment deposition in the northern South China Sea over the last 50,000 years.Palaeogeography, Palaeoclimatology, Palaeoecology, 465. 212-224, doi:10.1016/j.palaeo.2016.10.033PANGAEA Supplementary Data

Wittmann, H, von Blanckenburg, F, Mohtadi, M, Christl, M, Bernhardt, A (2017). The competition between coastal trace metal fluxes and oceanic mixing from the 10 Be/9 Be ratio: Implications for sedimentary records.Geophysical Research Letters, 44(16). 8443-8452, doi:10.1002/2017GL074259


Johnstone, HJH, Steinke, S, Kuhnert, H, Bickert, T, Pälike, H, Mohtadi, M (2016). Automated cleaning of foraminifera shells before Mg/Ca analysis using a pipette robot.Geochemistry, Geophysics, Geosystems, 17(8). 3502-3511, doi:10.1002/2016GC006422

Chen, W, Mohtadi, M, Schefuß, E, Mollenhauer, G (2016). Concentrations and abundance ratios of long-chain alkenones and glycerol dialkyl glycerol tetraethers in sinking particles south of Java.Deep Sea Research Part I: Oceanographic Research Papers, 112. 14-24, doi:10.1016/j.dsr.2016.02.010PANGAEA Supplementary Data

Mohtadi, M, Prange, M, Steinke, S (2016). Palaeoclimatic insights into forcing and response of monsoon rainfall.Nature, 533(7602). 191-199, doi:10.1038/nature17450


Kwiatkowski, C, Prange, M, Varma, V, Steinke, S, Hebbeln, D, Mohtadi, M (2015). Holocene variations of thermocline conditions in the eastern tropical Indian Ocean.Quaternary Science Reviews, 114. 33-42, doi:10.1016/j.quascirev.2015.01.028PANGAEA Supplementary Data

Setiawan, RY, Mohtadi, M, Southon, J, Groeneveld, J, Steinke, S, Hebbeln, D (2015). The consequences of opening the Sunda Strait on the hydrography of the eastern tropical Indian Ocean.Paleoceanography, 30(10). 1358-1372, doi:10.1002/2015PA002802PANGAEA Supplementary Data


Gibbons, FT, Oppo, DW, Mohtadi, M, Rosenthal, Y, Cheng, J, Liu, Z, Linsley, BK (2014). Deglacial δ18O and hydrologic variability in the tropical Pacific and Indian Oceans.Earth and Planetary Science Letters, 387. 240-251, doi:10.1016/j.epsl.2013.11.032PANGAEA Supplementary Data

Kuhnert, H, Kuhlmann, H, Mohtadi, M, Meggers, H, Baumann, KH, Pätzold, J (2014). Holocene tropical western Indian Ocean sea surface temperatures in covariation with climatic changes in the Indonesian region.Paleoceanography, 29(5). 423-437, doi:10.1002/2013PA002555PANGAEA Supplementary Data

Niedermeyer, EM, Sessions, AL, Feakins, SJ, Mohtadi, M (2014). Hydroclimate of the western Indo-Pacific Warm Pool during the past 24,000 years.Proceedings of the National Academy of Sciences, 111(26). 9402-9406, doi:10.1073/pnas.1323585111PANGAEA Supplementary Data

Dubois, N, Oppo, DW, Galy, VV, Mohtadi, M, van der Kaars, S, Tierney, JE, Rosenthal, Y, Eglinton, TI, Lückge, A, Linsley, BK (2014). Indonesian vegetation response to changes in rainfall seasonality over the past 25,000 years.Nature Geoscience, 7(7). 513-517, doi:10.1038/NGEO2182

Steinke, S, Mohtadi, M, Prange, M, Varma, V, Pittauerová, D, Fischer, HW (2014). Mid- to Late-Holocene Australian–Indonesian summer monsoon variability.Quaternary Science Reviews, 93. 142-154, doi:10.1016/j.quascirev.2014.04.006PANGAEA Supplementary Data

Mohtadi, M, Prange, M, Oppo, DW, de Pol-Holz, R, Merkel, U, Zhang, X, Steinke, S, Lückge, A (2014). North Atlantic forcing of tropical Indian Ocean climate.Nature, 509(7498). 76-80, doi:10.1038/nature13196PANGAEA Supplementary Data

Chen, W, Mohtadi, M, Schefuß, E, Mollenhauer, G (2014). Organic-geochemical proxies of sea surface temperature in surface sediments of the tropical eastern Indian Ocean.Deep Sea Research Part I: Oceanographic Research Papers, 88. 17-29, doi:10.1016/j.dsr.2014.03.005PANGAEA Supplementary Data

Steinke, S, Prange, M, Feist, C, Groeneveld, J, Mohtadi, M (2014). Upwelling variability off southern Indonesia over the past two millennia.Geophysical Research Letters, 41(21). 7684-7693, doi:10.1002/2014GL061450PANGAEA Supplementary Data


Martínez-Méndez, G, Hebbeln, D, Mohtadi, M, Lamy, F, de Pol-Holz, R, Reyes-Macaya, D, Freudenthal, T (2013). Changes in the advection of Antarctic Intermediate Water to the northern Chilean coast during the last 970 kyr.Paleoceanography, 28(4). 607-618, doi:10.1002/palo.20047PANGAEA Supplementary Data

Hessler, I, Young, M, Holzwarth, U, Mohtadi, M, Lückge, A, Behling, H (2013). Imprint of eastern Indian Ocean surface oceanography on modern organic-walled dinoflagellate cyst assemblages.Marine Micropaleontology, 101. 89-105, doi:10.1016/j.marmicro.2013.02.005PANGAEA Supplementary Data

Southon, J, Mohtadi, M, de Pol-Holz, R (2013). Planktic Foram Dates from the Indonesian Arc: Marine 14C Reservoir Ages and a Mythical AD 535 Volcanic Eruption.Radiocarbon, 55(2-3). 1164-1172, doi:10.2458/azu_js_rc.55.16384PANGAEA Supplementary Data


Romero, OE, Mohtadi, M, Helmke, P, Hebbeln, D (2012). High interglacial diatom paleoproductivity in the westernmost Indo-Pacific Warm Pool during the past 130,000 years.Paleoceanography, 27. PA3209, doi:10.1029/2012PA002299PANGAEA Supplementary Data

Yu, PS, Kienast, M, Chen, MT, Cacho, I, Flores, JA, Mohtadi, M, Mix, AC (2012). Influences of extratropical water masses on equatorial Pacific cold tongue variability during the past 160 ka as revealed by faunal evidence of planktic foraminifers.Journal of Quaternary Science, 27(9). 921-931, doi:10.1002/jqs.2582PANGAEA Supplementary Data

Ho, SL, Mollenhauer, G, Lamy, F, Martinez-Garcia, A, Mohtadi, M, Gersonde, R, Hebbeln, D, Nunez-Ricardo, S, Rosell-Melé, A, Tiedemann, R (2012). Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr.Paleoceanography, 27. PA4202, doi:10.1029/2012PA002317PANGAEA Supplementary Data


Mohtadi, M, Oppo, DW, Steinke, S, Stuut, JB, de Pol-Holz, R, Hebbeln, D, Lückge, A (2011). Glacial to Holocene swings of the Australian-Indonesian monsoon.Nature Geoscience, 4(8). 540-544, doi:10.1038/ngeo1209PANGAEA Supplementary Data

Haarmann, T, Hathorne, EC, Mohtadi, M, Groeneveld, J, Kölling, M, Bickert, T (2011). Mg/Ca ratios of single planktonic foraminifer shells and the potential to reconstruct the thermal seasonality of the water column.Paleoceanography, 26. PA3218, doi:10.1029/2010PA002091PANGAEA Supplementary Data

Steinke, S, Glatz, C, Mohtadi, M, Groeneveld, J, Li, Q, Jian, Z (2011). Past dynamics of the East Asian monsoon: No inverse behaviour between the summer and winter monsoon during the Holocene.Global and Planetary Change, 78(3-4). 170-177, doi:10.1016/j.gloplacha.2011.06.006PANGAEA Supplementary Data

Mohtadi, M, Oppo, DW, Lückge, A, de Pol-Holz, R, Groeneveld, J, Steinke, S, Hemme, N, Hebbeln, D (2011). Reconstructing the thermal structure of the upper ocean: Insights from planktic foraminifera shell chemistry and alkenones in modern sediments of the tropical eastern Indian Ocean.Paleoceanography, 26. PA2119, doi:10.1029/2011PA002132PANGAEA Supplementary Data


Baumgart, A, Jennerjahn, TC, Mohtadi, M, Hebbeln, D (2010). Distribution and burial of organic carbon in sediments from the Indian Ocean upwelling region off Java and Sumatra, Indonesia.Deep Sea Research Part I: Oceanographic Research Papers, 57(3). 458-467, doi:10.1016/j.dsr.2009.12.002PANGAEA Supplementary Data

Mohtadi, M, Steinke, S, Lückge, A, Groeneveld, J, Hathorne, EC (2010). Glacial to Holocene surface hydrography of the tropical eastern Indian Ocean.Earth and Planetary Science Letters, 292(1-2). 89-97, doi:10.1016/j.epsl.2010.01.024PANGAEA Supplementary Data

Mohtadi, M, Lückge, A, Steinke, S, Groeneveld, J, Hebbeln, D, Westphal, N (2010). Late Pleistocene surface and thermocline conditions of the eastern tropical Indian Ocean.Quaternary Science Reviews, 29(7-8). 887-896, doi:10.1016/j.quascirev.2009.12.006PANGAEA Supplementary Data

de Pol-Holz, R, Keigwin, LD, Southon, JR, Hebbeln, D, Mohtadi, M (2010). No signature of abyssal carbon in intermediate waters off Chile during deglaciaition.Nature Geoscience, 3(3). 192-195, doi:10.1038/ngeo745PANGAEA Supplementary Data

Steinke, S, Mohtadi, M, Groeneveld, J, Lin, LC, Löwemark, L, Chen, MT, Rendle-Bühring, R (2010). Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development.Paleoceanography, 25. PA2219, doi:10.1029/2009PA001850PANGAEA Supplementary Data


Mohtadi, M, Steinke, S, Groeneveld, J, Fink, HG, Rixen, T, Hebbeln, D, Donner, B, Herunadi, B (2009). Low-latitude control on seasonal and interannual changes in planktonic foraminiferal flux and shell geochemistry off south Java: A sediment trap study.Paleoceanography, 24. PA1201, doi:10.1029/2008PA001636PANGAEA Supplementary Data

Lückge, A, Mohtadi, M, Rühlemann, C, Scheeder, G, Vink, A, Reinhardt, L, Wiedicke, M (2009). Monsoon versus ocean circulation controls on paleoenvironmental conditions off southern Sumatra during the past 300,000 years.Paleoceanography, 24. PA1208, doi:10.1029/2008PA001627PANGAEA Supplementary Data

Mohtadi, M, Rossel, PE, Lange, CB, Pantoja, S, Böning, P, Repeta, DJ, Grunwald, M, Lamy, F, Hebbeln, D, Brumsack, HJ (2008). Deglacial pattern of circulation and marine productivity in the upwelling region off central-south Chile.Earth and Planetary Science Letters, 272. 221-230, doi:10.1016/j.epsl.2008.04.043PANGAEA Supplementary Data

Kaiser, J, Schefuß, E, Lamy, F, Mohtadi, M, Hebbeln, D (2008). Glacial to Holocene changes in sea surface temperature and coastal vegetation in north central Chile: high versus low latitude forcing.Quaternary Science Reviews, 27(21-22). 2064-2075, doi:10.1016/j.quascirev.2008.08.025

Mohtadi, M, Romero, OE, Kaiser, J, Hebbeln, D (2007). Cooling of the southern high latitudes during the Medieval Period and its effect on ENSO.Quaternary Science Reviews, 26(7-8). 1055-1066, doi:10.1016/j.quascirev.2006.12.008PANGAEA Supplementary Data

Mohtadi, M, Max, L, Hebbeln, D, Baumgart, A, Krück, N, Jennerjahn, TC (2007). Modern environmental conditions recorded in surface sediment samples off W and SW Indonesia: Planktonic foraminifera and biogenic compounds analyses.Marine Micropaleontology, 65(1-2). 96-112, doi:10.1016/j.marmicro.2007.06.004PANGAEA Supplementary Data

Hebbeln, D, Lamy, F, Mohtadi, M, Echtler, H (2007). Tracing the impact of glacial/interglacial climate variability on erosion of the Southern Andes.Geology, 35(2). 131-134, doi:10.1130/G23243A.1

2004 - 2006

Mohtadi, M, Hebbeln, D, Nunez-Ricardo, S, Lange, CB (2006). El Niño-like pattern in the Pacific during Marine Isotope Stages (MIS) 13 and 11?Paleoceanography, 21. PA1015, doi:10.1029/2005PA001190PANGAEA Supplementary Data

Stuut, JB, Marchant, M, Kaiser, J, Lamy, F, Mohtadi, M, Romero, OE, Hebbeln, D (2006). The late Quaternary paleoenvironment of Chile as seen from marine archives.Geographica Helvetica, 61(2). 135-151, doi:10.5194/gh-61-135-2006

Mohtadi, M, Hebbeln, D, Marchant, M (2005). Upwelling and productivity along the Peru-Chile current derived from faunal and isotopic compositions of planktic foraminifera in surface sediments.Marine Geology, 216(3), 107-126, doi:10.1016/j.margeo.2005.01.008PANGAEA Supplementary Data

Mohtadi, M, Romero, OE, Hebbeln, D (2004). Changing marine productivity off northern Chile during the last 19,000 years: A multivariable approach.Journal of Quaternary Science, 19(4). 347-360, doi:10.1002/jqs.832PANGAEA Supplementary Data

Mohtadi, M, Hebbeln, D (2004). Mechanisms and variations of the paleoproductivity off northern Chile (24°S-33°S) during the last 40,000 years.Paleoceanography, 19. PA2023, doi:10.1029/2004PA001003PANGAEA Supplementary Data

Hong Kong
© Courtesy of Torsten Bierstedt
Multi-corer, South China Sea
© Courtesy of Xiajing Li
Sediment sampling on deck
© Courtesy of Robin Beaman
© Courtesy of Torsten Bierstedt
CTD-water sampler recovery
© Mahyar Mohtadi
© Courtesy of Robin Beaman
Coral Sea
© Mahyar Mohtadi
© Courtesy of Robin Beaman
Gloria Knolls
© Mahyar Mohtadi
Launching MeBo 70, SO-221
© Courtesy of Thorsten Klein
Great Barrier Reef
© Mahyar Mohtadi
Torres Strait
© Courtesy of Willem Renema
SO-256, GBR
© Mahyar Mohtadi
Box corer on deck
© Mahyar Mohtadi
Torres Strait
© Courtesy of Martina Hollstein


As Chief scientist:

Other expeditions

  • SONNE-211 (ChiMeBo), SE Pacific, Valparaíso-Valparaíso, 2.11.-28.11.2011
  • SONNE-184 (PABESIA), Durban-Chilachap-Darwin, 08.07. – 13.09.2005
  • SONNE-189 (SUMATRA), E Indian Ocean, Jakarta-Jakarta, 06.09.-07.10.2006
  • SONNE-161 (SPOC) SE Pacific, Valparaíso–Valparaíso, 25.12.2001-24.01.2002
  • SONNE-156 (PUCK) SE Pacific, Valparaíso–Talcahuano, 14.04.-14.05.2001

Selected talks

  • XXI INQUA Congress, Rome. Italy, 2023 (keynote)
  • IRQUA 5rd National Conference on Quaternary Climate, Tehran, Iran, 2023 (invited)
  • IRQUA 3rd International Conference on Quaternary Climate, Tehran, Iran, 2021 (keynote)
  • 36th International Geological Congress, New Delhi, India, 2020 (keynote)
  • Symposium on Multiscale Climate Variability and Dynamics, Xi’an, China, 2019 (invited)
  • Western Pacific Paleoceanography IV, Keelung, Taiwan, 2019 (keynote)
  • 4th Xiamen Symposium on Marine Environmental Sciences, Xiamen, China, 2019 (invited)
  • ICTP 2nd Meeting on Monsoons and Tropical Rain, Trieste, Italy, 2018 (keynote)
  • EGU Annual Meeting, Vienna, Austria, 2018 (invited)
  • AGU Fall Meeting, New Orleans, USA, 2017 (invited)
  • 12thInternational Conference on Paleoceanography, Utrecht, the Netherlands, 2016 (invited)
  • Annual Meeting of the Japanese Quaternary Society, Chiba, Japan, 2016 (keynote)
  • AGU Chapman Conference on the evolution of the Asian Monsoon, Hong Kong, China, 2015
  • AGU Fall Meeting, San Francisco, USA, 2014 (invited)
  • SAGE Workshop Ocean Gateways, Berlin, Germany, 2013 (keynote)
  • IMAGES/PAGES WPP III Workshop, Kaohsiung, Taiwan, 2013 (keynote)
  • AOGS-AGU (WPGM) Meeting, Singapore, 2012 (invited)
  • 7th ICAMG Meeting, Goa, India, 2011
  • IMAGES WPP II Workshop, Keelung, Taiwan, 2011 (keynote)
  • AGU Fall Meeting, San Francisco, USA, 2009 (invited)
  • AGU Chapman Conference on Abrupt Climate Change, Columbus, USA, 2009