Seiteninhalt:
Dr. Ines Hessler
Name: | Dr. Ines Hessler | |
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Abteilung: | General Geology - Marine Geology | |
Funktionen: | Post-Doctoral Researcher | |
Raum: | ||
Telefon: | 0421 218 - 65537 | |
E-Mail: |
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Now at:
Department of Biological Sciences
Faculty of Science
Macquarie University, NSW 2109
Australia
http://bio.mq.edu.au/about/staff/person.htm?id=ihessler
Current Project
Comparing last glacial organic-walled dinoflagellate cyst assemblages with Mg/Ca-based sea surface temperatures obtained from planktonic foraminifera using sediments of Ocean Program Drilling Site 1078 (off Angola)
The tropical South East Atlantic ocean circulation is dominated by a wind-driven current system comprising the Benguela Current (BC) and the Angola Current (AC). As one of the World’s four major eastern boundary currents the BC is dominated by a coastal upwelling system, the Benguela upwelling system (e.g. Nelson and Hutchings, 1983). A further prominent feature of the South East Atlantic is the Angola-Benguela Front (ABF), a convergence zone between the cold BC and the warm AC. The sea surface temperature (SST) gradient across the ABF and the front's seasonally shifting position appear to be strongly correlated to the intensity of the South East trade-winds (e.g Nelson and Hutchings, 1983).
During the last glacial and the last deglaciation (~75-10 ka BP) major climate change occurred that has been attributed to e.g. changes in the insolation, changes in the atmospheric CO2 concentration, changes in the global ice cover et cetera. Due to the highly complex nature of these processes the last glacial and deglaciation are of particular interest for the scientific community.
In order to shed more light on variations in the marine surface conditions in the South East Atlantic during the last glacial and deglaciation, I am interpreting an high-resolution record of organic-walled dinoflagellate cysts from ODP Site 1078 (off Angola) and combining it with the SST record obtained from the Mg/Ca of planktonic foraminifers (Hessler et al., 2011). This combination will reveal a more comprehensive picture of the oceanographic development in the tropical South East Atlantic during the last glacial and deglaciation. However, since the Mg/Ca record of Hessler et al. (2011) only covers the period between 50 and 23 ka BP about 100 additional Mg/Ca data of Globigerinoides ruber (pink) and Globigerina bulloides will be obtained for the period 23 to 10 ka BP.
Academic Career
| Post-Doctoral Researcher 2012 | within GLOMAR (Global Change in a Marine Realm) graduate school at the MARUM-Center for Marine Environmental Sciences, University of Bremen, Germany Project: Comparing last glacial organic-walled dinoflagellate cyst assemblages with Mg/Ca-based sea surface temperatures obtained from planktonic foraminifera using sediments of Ocean Program Drilling Site 1078 (off Angola). |
| Post-Doctoral Researcher 2011 | at the Department of Palynology and Climate Dynamics, Georg-August University Göttingen, Germany Project: Organic-walled dinoflagellate cysts as environmental indicators in marine surface sediments from the eastern Indian Ocean. |
| PhD thesis 2008-2011 | at the Marine Center of Environmental Sciences (MARUM), University of Bremen: "Oceanography, Climate and Vegetation development of tropical Africa during the last glacial: Palynology and geochemistry of marine sediments of ODP 1078 (off Angola)" Supervised by: Prof. Dr. Dr. Gerold Wefer, Dr. Lydie Dupont |
| Diploma degree 2007 | in Geology and Palaeontology at the Freie Universität Berlin |
| Diploma thesis | at the Alfred-Wegener-Institute for Polar and Marine Research, Potsdam: "Holozäne Vegetations- und Klimarekonstruktion des Kuhai-Sees und seiner Umgebung (NW-China) mittels palynologischer Untersuchungen" (engl.: Holocene vegetation and climate reconstruction from Lake Kuhai and surrounding areas (NW-China) using palynological investigations) |
| Diploma mapping project | at the Freie Universität Berlin: "Erläuterungen zur Geologischen Karte von Sommerschenburg-Wefensleben" (engl.: Explanation report of the geological map of Sommerschenburg-Wefensleben") |
Current Administrative Position
| INQUA (International Union for Quaternary Research) Paleoclimate Commission (PALCOMM) Secretary | |
| Scientific Program Committee, PAGES 2nd Young Scientist Meeting, 11-12 Feb 2012, Goa, India |
Publications
Hessler, I., Dupont, L., Merkel, U., Handiani, D., Paul, A., Wefer, G., 2012, Masked millennial-scale climate variations in southwest Africa during the last glaciation. Climate of the Past 8, 841-853.
Hessler, I., Steinke, S., Groeneveld, J., Dupont, L., Wefer, G., 2011, Impact of abrupt climate change in the tropical southeast Atlantic during Marine Isotope Stage (MIS) 3. Paleoceanography 26, PA4209.
Hessler, I., Dupont, L., Bonnefille, R., Behling, H. González, C., Helmens, K.F, Hooghiemstra, H., Lebamba, J., Ledru, M.-P., Maley, J., Marret, F., Vinces, A., 2010. Millennial-scale changes in vegetation records from tropical Africa and South America during the last glacial. Quaternary Science Reviews 29, 2882-2899.
Hessler, I., Young, M., Holzwarth, U., Mohtadi, M., Lückge, A., Behling, H., submitted, Imprint of the Eastern Indian Ocean surface oceanography on modern organic-walled dinoflagellate cyst assemblages.
Harrison, S.P., Bartlein, P.J., Brewer, S., Prentice, I.C., Boyd, M., Hessler, I., Holmgren, K., Izumi, K., Willis, K., submitted, Model benchmarking with glacial and mid-Holocene climates
Hessler, L., Dupont, L., Behling, H., Marret, F., Wefer, G., in prep., Shifts in the marine surface water conditions of the tropical southeast Atlantic during the last glacial and deglaciation reconstructed using organic-walled dinoflagellate cysts.