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(Dipl. Geogr.) Anna Kloss
Name: | (Dipl. Geogr.) Anna Kloss | |
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Department: | Geosystem Modeling | |
Job: | PhD student | |
Room: | ||
Phone: | +49 421 218 - 65663 | |
E-Mail: |
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Map
Office address
MARUM
Room 1340
Leobenerstrasse
28359 Bremen
Mail address
MARUM
Universität Bremen
Postfach 33 04 40
28334 Bremen
Graduate School
Research Interests
- Oxygen (and carbon) stable isotopes and Mg/Ca in benthic foraminifera
- Reconstruction of paleo sea water density, temperature and salinity
- Vertical distribution of deep water masses in the South Atlantic Ocean during the LGM (19 – 23 ka)
- Intensity and stability of the Atlantic Meridional Overturning Circulation during the LGM
PhD Project
| Title | "Deep water properties and meridional overturning circulation in the South Atlantic Ocean during the Last Glacial Maximum" |
| Supervison by | Prof. Michael Schulz, Dr. Stefan Mulitza and Dr. André Paul |
| Part of the research area project | Ocean and Climate 5 "Quantifying Last Glacial Maximum ocean circulation by state estimation” |
The Atlantic Meridional Overturning Circulation (AMOC) is a key factor in the climate system due to its latent heat transport from low to high latitudes. Therefore variations of its intensity and stability can lead to considerable change of the global climate. However, both Last Glacial Maximum (LGM, 19-23 ka) and future model simulations show ambiguous results for the rates of the Atlantic meridional overturning. OC5 aims to reduce the uncertainties in the glacial AMOC reconstructions by combining paleo-proxy data with a numerical ocean model.
According to up to data paleoceanographic studies, a major reorganisation in the AMOC occurred between the LGM and today. This change is thought to be associated with a vertical redistribution of water masses. Within the scope of my PhD project I will use paleoceanographic reconstructions in order to determine the vertical structure and of modern and glacial water masses in the South Atlantic basin in order to test this hypothesis.
To intersect the major water masses, I study two depth transects at the continental slope off Namibia at 23°S and off South Brazil at 27°S, consisting of several gravity cores and corresponding surface and bottom water samples. To identify the prevailing water masses, I reconstruct the vertical distribution of temperature and salinity (i.e. δ18Oseawater) by combining paired Mg/Ca and oxygen isotope measurements on the benthic foraminiferal species Oridorsalis umbonatus. Additionally, the temperature and salinity data will be used to calculate the vertical distribution of sea water density. The difference in density between the South Brazilian and the Namibian margin will reflect the strength and the direction of the meridional water transport across the glacial ocean basin, and thus will be an indicator for the characteristics of the AMOC during the LGM.
Finally, these data will contribute to the model simulation of the OC5-Project.
Model simulations of the AMOC (after Otto-Bliesner et al. 2007) ____________________________________
Sample locations (Bleil et al. 1993 M23/2; Zabel at al. 2003 M57/2) and the schematic circulation of the AMOC in the South Atlantic
Conference Contributions
- Kloss A., A. Mackensen, S. Mulitza, A. Paul, M. Schulz (2011): „Vertical distribution of deep and intermediate water masses in the Southeast Atlantic Ocean (23°S) during the Last Glacial Maximum”, POSTER
RAPID - USAMOC International Science Meeting "Past, Present and Future Change in the Atlantic Meridional Overturning Circulation", 12 - 15 Jul 2011, Bristol, UK
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- - A. Kloss, A. Mackensen, S. Mulitza, A. Paul, M. Schulz (2010): „Vertical water mass structure determined by oxygen isotopes in modern and glacial benthic foraminifera (Oridorsalis umbonatus) off Namibia at 23°S”, POSTER
Chair of the session “Earth system modelling and analysis”
1st PhD Student Conference “Integrated climate and earth system sciences in Northern Germany”, 04 – 06 Oct 2010, University of Hamburg, Germany
------------------------------------------------------------------------------------------------------------------------------------------------------------ - A. Kloss, A. Mackensen, S. Mulitza, A. Paul, M. Schulz (2010): „Vertical distribution of oxygen and carbon isotopes in modern and Last Glacial Maximum benthic foraminifera (Oridorsalis umbonatus) from the continental slope off Namibia at 23°S”, POSTER
10th International Conference on Paleoceanography 29 Aug – 03 Sep 2010, La Jolla, San Diego, CA, USA
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Expeditions
- R.V. Sonne SO-213 “SOPATRA” (Leg 1, 27 Dec – 13 Jan 2011, Valparaiso – Valparaiso, Chile) "South Pacific Transect - Paleoceanography and Geophysics"
Chief scientist: R. Tiedemann (AWI, Bremerhaven)
-------------------------------------------------------------------------------------------------------------------------------------------------------------- - R.V. Pelagia 64PE320 “TRACOS” (27 May – 10 June 2010, Bermuda – Bermuda) “Biodiversity, ecosystem functioning and mound development of cold-water coral reefs in the Cape Lookout area, West Atlantic”
Chief scientist: F. Mienis (MARUM, University of Bremen), G. Duineveld & M. Lavaleye (NIOZ, Texel, Netherlands)
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Curriculum Vitae
| 08/2009 – recent 08/2011-11/2011 04/2010-10/2011 | Ph.D. student at the MARUM in the research project OC5 Research stay at the Georiga Institute of Technology in the School of Earth and Atmospheric Sciences, Atlanta USA. Advisor: Dr. J. Lynch-Stieglitz PhD representative of the Graduate School GLOMAR |
| 10/2005 – 02/2009 11/2007 - 10/2008 | Studies of physical Geography at the Leibniz University of Hannover (minor subjects: Geology & Meteorology) Degree: Diplom ≈ M.Sc. Diploma thesis: “Water isotope geochemistry of recent precipitation in Central and North Siberia as a proxy for the local and regional climate system” at the AWI, Potsdam. Advisor: Dr. H. Meyer |
| 10/2003 – 09/2005 | Studies of physical Geography at the University of Bremen (minor subjects: Geology & Biology) Degree: Vordiplom |
Attended Courses / Workshops
| ECOLMAS Scientific writing for natural scientists | 04/2011, MARUM, University of Bremen R. Rendle-Bühring |
| ECOLMAS An introduction to Ocean Data View (ODV) | 03/2011, MARUM, University of Bremen R. Schlitzer |
| ECOLMAS LaTeX: A short Introduction | 01/2011, MARUM, University of Bremen W.-D. Gladrow |
| MARUM - GLOMAR PhD workshop Sediment dynamics and oceanographic settings in the SW Atlantic | 01/2011, MARUM, University of Bremen Keynote lecturer: A. Piola, J. Hernández-Molina, D. Stow, R. Violante, C. Chiessi |
| ECOLMAS An introduction to the Data Library PANGAEA | 12/2010, MARUM, University of Bremen S. Schumacher, R. Sieger |
| ECORD Summer School 2010 Dynamics of Past Climate Changes | 09/2010, MARUM, University of Bremen D. Hebbeln, M. Schulz, U. Röhl |
| ECOLMAS Hydrocarbon Exploration – Geoscientists in a multi-disciplinary value creation process | 05/2010, MARUM, University of Bremen M. Geiger |
| ECOLMAS A short primer on ice core research | 02/2010, MARUM, University of Bremen H. Fischer |
| ECOLMAS Project Management – starting, managing, and implementing projects successfully | 01/2010, MARUM, University of Bremen F. Fischer |
| ECOLMAS An Introduction to MATLAB for Geoscientists | 01/2010, MARUM, University of Bremen D. Heslop |
| ECOLMAS Scientific public outreach | 11/2009, MARUM, University of Bremen T. Wolff, T. Markus |
| ECOLMAS Introductory Course on Socio-Economic and Institutional Dimensions of Global Climate Change in the Marine Realm | 11/2009, MARUM, University of Bremen G. Winter, I. Heidbrink, H. Lange, G.Markus, H. Garrelts, S. Lohse, T. Markus |