Dr. Mahyar Mohtadi Hamadani

Past climate change with an emphasis on the mid- and low-latitude climate, specifically in the following areas:

Eastern tropical Indian Ocean
Reconstructing past climate of the Indonesian Archipelago that involves past variability of the Australian-Indonesian monsoon system, Indian Ocean Dipole Mode, Indonesian Throughflow, and El Niño-Southern Oscillation (ENSO). A collaborative effort by German, Indonesian, and US scientists, running since 2005.
Funding sources: BMBF projects PABESIA, SUMATRA, and SPICE III, DFG project HE 3412/15-1.

Eastern South Pacific Ocean
Reconstructing past climate of the Eastern South Pacific and its connection to high- and low-latitude climate. A joint effort by German, Chilean, and US scientists, running since 2001.
Funding sources: BMBF projects PUCK and CHIMEBO.

South China Sea
Recontructing natural variability of the East Asian summer monsoon during the interglacials in order to estimate the anthropogenic influence on the Asian monsoon system. A collaborative effort by German and Chinese scientists, running since April 2011.
Funding sources: BMBF projects CARIMA and INVERS.

Mohtadi M., Oppo D.W., Steinke S., Stuut J-B W., De Pol-Holz R., Hebbeln D., Lückge A., 2011. Glacial to Holocene swings of the Australian-Indonesian monsoon. Nature Geoscience 4, 540-544.

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, 170-177.

Mohtadi M., Oppo D.W., Lückge A., De Pol-Holz R, Steinke S., Groeneveld J., 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, PA3219, doi:10.1029/2011PA002132.

Haarmann T., Hathorne E., 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:10.1029/2010PA002091.

Steinke S., Mohtadi M., Groeneveld J., Lin L-C., Löwemark L., Chen M-T., Rendle-Bühring R., 2010. Reconstructing the southern South China Sea upper water-column structure since the Last Glacial Maximum (LGM): Implications for the East Asian winter monsoon development. Paleoceanography 25, PA2219, doi:10.1029/2009PA001850.

Mohtadi M., Steinke S., Lückge A., Groeneveld J, Hathorne E.C., 2010. Glacial to Holocene surface hydrography of the tropical eastern Indian Ocean. Earth and Planetary Science Letters 292, 89-97.

Baumgart A., Jennerjahn T., 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 I 57, 458-467.

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, 887-896.

De Pol-Holz R., Keigwin L., Southon J., Hebbeln D., Mohtadi M., 2010. No signature of abyssal carbon in intermediate waters off Chile during deglaciation. Nature Geoscience 3, 192-195.

Lückge A., Mohtadi M., Rühlemann C., Scheeder G., Vink A., Reinhardt L., Wiedicke-Hombach M., 2009. Monsoon versus ocean circulation controls on paleoenvironmental conditions off southern Sumatra during the past 300,000 years. Paleoceanography 24, PA1208, doi:10.1029/2008PA001627.

Mohtadi M., Steinke S., Groeneveld J., Fink H.G., Rixen T. , Hebbeln D., Donner B., Herunadi B., 2009. Low-latitude control on seasonal and inter-annual changes in planktonic foraminiferal flux and shell geochemistry off south Java: a sediment trap study. Paleoceanography 24, PA1201, doi:10.1029/2008PA001636.

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, 2064-2075.

Mohtadi M., Rossel P., Lange C.B., Pantoja S., Böning P., Repeta D.J., Grunwald M., Lamy F., Hebbeln D., Brumsack H.-J., 2008. Deglacial pattern of circulation and marine productivity in the upwelling region off central-south Chile. Earth and Planetary Science Letters 272, 221-230.

Mohtadi M., Max L., Hebbeln D., Baumgart A., Krück N., Jennerjahn T., 2007. Modern environmental conditions recorded in surface sediment samples off W and SW Indonesia: planktonic foraminifera and biogenic compounds analyses. Marine Micropaleontology 65, 96-112.

Mohtadi M., Romero O.E., Kaiser J., Hebbeln D., 2007. Cooling of the southern high latitudes during the Medieval Period and its effect on ENSO. Quaternary Science Reviews 26, 1055-1066.

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, 131-134.

Marchant M., Cecioni A., Figueroa S., Gonzales H., Giglio S., Hebbeln D., Kaiser J., Lamy F., Mohtadi M., Pineda V., Romero O.E., 2007. Marine geology, oceanography and climate. In: Moreno, T. & Gibbons, W. (Eds.), The Geology of Chile. The Geological Society, London, 289-309.

Stuut J.-B. W., Marchant M., Kaiser J., Lamy F., Mohtadi M., Romero O.E., Hebbeln D., 2006. The Late Quaternary paleoenvironment of Chile as seen from marine archives. Geographica Helvetica 61, 135-151.

Mohtadi M., Hebbeln D., Nuñez-Ricardo S., Lange C.B., 2006. El Niño-like pattern in the Pacific during Marine Isotope Stages (MIS) 13 and 11? Paleoceanography 21, PA1015, doi:10.1029/2005PA001190.

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, 107-126.

Mohtadi M., Hebbeln D., 2004. Mechanisms and variations of paleoproductivity off northern Chile (24°S-33°S) during the last 40,000 years. Paleoceanography 19, PA 2023, doi: 10.1029/2004PA001003.

Mohtadi M., Romero O.E., Hebbeln D., 2004. Changing marine productivity off northern Chile during the past 19,000 years: a multi-variable approach. Journal of Quaternary Science 19, 347-360.

• SONNE (TransGeoBiOc), W Pacific, Pusan-Suva, 09.09.-08.10.2012 (Chief scientist)

• SONNE-221 (INVERS), South China Sea, Hong Kong-Hong Kong, 17.05.-07.06.2012 (Chief scientist)

• SONNE-211 (ChiMeBo), SE Pacific, Valparaíso–Valparaíso, 02.11.-28.11.2011

• SONNE-189 (SUMATRA) E Indic, Jakarta-Jakarta, 06.09.-07.10.2006

• SONNE-184 (PABESIA) E Indic, Durban-Cilacap-Darwin, 08.07.-13.09.2005 (Co-Chief scientist)

• 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