Junior Research Group: Palaeohydrology
Dr. Dirk Sachse
- +49-331 9775841
- +49 331 977 5700
- Research Focus
Between 2009 and 2014 Dirk Sachse lead the Emmy-Noether Research Group 'Paleohydrology' - funded by the DFG - at the Institute of Earth and Environmental Sciences at the University of Potsdam . The group is now being transitioned to the new Organic Surface Geochemistry Lab at GFZ Section 5.1, lead by Dirk Sachse. See details there.
Below find an archive of the group activities between 2009 and 2014 at UP:
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- 8/2014: We just returned from our final 2-day group retreat in Falkensee
- 6/2014: several group members presented work at the Goldschmidt 2014 confernece in Sacramanto
- 2/2014: The work of our group is featured in the "DFG-Magazin", the monthly webzine of the German Research Foundation (DFG)
- 1/2014: Olli's paper is now out in Nature Geoscience, where we show that the water cycle amplified abrupt climate change during the onset of the Younger Dryas in western Europe. The hydrological response on the continent was actually delayed by 170 years relative to the onset of cooling in the Greenland Icecores. This delay was likely due to a major reorganization of amtosphgeric circulation patterns over Europe at that time, highlighting the role of the hydrological cycle during abrput temperature changes.
- link to paper at Nature Geoscience
- News and Views article in Nature Geoscience by A. Morena about our paper
- press release by UP and GFZ
- media coverage of the article in Spiegel Online (german), Die Welt (german), nu.nl (dutch), swedish radio(swedish) and a number of online science news websites (englisch)
- TV interview with Dirk in the daily weather show of the Hessischer Rundfunk "Alle Wetter"
- 12/2013: Saswatis first paper about her work at Lonar Lake is out in Organic Geochemistry
- 12/2013: Several presentations by Sachse Lab members were happening at AGU Fall Meeting 2013 in San Francisco:
- Hoffmann et al.: PP34B-03. Spatial hydrologic heterogeneity within a fluvial catchment reflected in surface water and leaf wax n-alkane δD
- Rach et al.: PP43B-2076. A quantitative reconstruction of changes in relative humidity during the Younger Dryas in Western Europe
- Rohrmann et al.: PP43B-2093. Reconstructing the Mio-Pliocene South American Monsoon and Orographic Barrier Evolution (Angastaco Basin, NW Argentina)
- 11/2013: Watch a movie made by the HFF Potsdam on our fieldwork and the INTIMATE summer school at Lake Hämelsee in July 2013, where we cored down to the Late Glacial!
- 09/2013: Dirk, Lidia and Bernd presented their work at the IMOG conference in Tenerife
- 09/2013: Bernds first paper on the leaf wax distribution of Acacia and Eucalyptus leaves along a hydrological gradient is published in OG!
- 08/2013: Our group was present with three presentations at the 2013 Goldschmidt meeting in Florence
- 06/2013: Our new Delta V Isotope Ratio Mass Spectrometer with a GC and EA coupling is now in operation!
- 04/2013: Dirk will present our work on quantitative paleohydrological reconstruction at the INTIMATE spring meeting April 27-May 1 in Scotland
- 02/2013: Lidias two papers on the biomarker distribution and the biomarker D/H ratios from tropical lake Isabela were accepted in late 2012 and early 2013
- 12/2012: Our group will be present at AGU Fall Meeting 2012 (Dec 3-7) in San Francisco this year with 4 oral first author presentations [download internary and abstracts as pdf]:
- Garcin et al.: [B12A-02] Estimating C3 vs. C4 vegetation cover from sedimentary records – a surface sediment test from Cameroon, Western Central Africa
- Sachse et al: [B32A-04] Spatial patterns of D/H ratios in meteoric water, leaf waxes from plants, POM and sediments within a large fluvial Himalayan catchment
- Rach et al.: [PP42A-07] A 200-year delay in the response of the hydrological cycle in Western Europe to Northern hemispheric cooling during the Younger Dryas
- Sarkar et al.: [PP51C-07] Biomarker evidence for increasing aridity in south-central India over the Holocene
- 10/2012: PhD student Marga Jambina from the University of Zaragoza, Spain, will visit our lab from Oct 9 - Dec 13 to work on a Holocene sediment core. This work is funded through an INTIMATE-COST action short-term scientific mission (STSM).
- 9/2012: Bruno Gamarra Vives from Ansgar Kahmen's Physiological Plant Ecology Group at ETH Zurich has won the GASIR Poster Prize 2012 for work which he conducted partly here with us in Potsdam.
- 8/2012: our group presented their work in one talk (Sachse et al.) and 2 posters Romero-Viana et al.; Sarkar et al.) at this years International Paleolimnology Symposium in Glasgow, UK
- 5/2012: PhD student Bernd Hoffmann is on a research stay at Sarah Feakins' lab at USC in L.A. andBodo Bookhagens lab at UC Santa Barbara. Funded through DFG-GK 1364
- 5/2012: PhD student Oliver Rach conducted a research visit to Ansgar Kahmen's Physiological Plant Ecology Group at ETH Zurich
- 5/2012: Bruno Gamarra Vives from Ansgar Kahmen's Physiological Plant Ecology Group at ETH Zurich visited our lab to conduct lipid extractions on plants. Stay was funded through a STSM of EU COST Action ES0806 SIBAE
- 4/2012: PhD student Oliver Rach presented his research at the 2012 EGU general assembly in Vienna. Oliver was awarded a travel stipend by the EGU. Congratulations!
- 3/2012: PhD student Bernd Hoffmann conducted a research stay at Ansgar Kahmen'sPhysiological Plant Ecology Group at ETH Zurich, funded through a STSM of EU COST Action ES0806 SIBAE
- 1/2012: Lidia Romero started her new Postdoc project in our group within the REKLIM initiative in cooperation with Achim Brauer at GFZ Potsdam
- 8/2011: Members of our group have presented their research at the 2011 Goldschmidt Conference in Prague:
- Oliver Rach et al. - A High-Resolution Paleohydrological Record of the Younger Dryas Episode from Western Europe – Using Lipid Biomarker D/H Ratios - abstract (oral)
- Lidia Romero Viana et al. - Hydrogen Isotopic Signatures of Algal Biomarkers as a Proxy of Hydroclimatic Variability in Lake Isabel, Mexico - abstract (oral)
- 7/2011: Bernd Hoffmann has joined our group as a PhD student, working with the graduate school 1364
- 28/5/2011: Our group will participate in the 'Long night of Science' (Lange Nacht der Wissenschaften)conducted throughout the Berlin-Potsdam area on Saturday, May 28 from 5pm-1am. You find us here.
- 5/2011: Marlene has received a travel scholarship of the EAOG (European Association of Organic Geochemists) to work for three months in the aDNA lab at Adelaide - Congratulations!
- 4/2011: Members of our group have presented work at the EGU Meeting April 4-8 2011 in Vienna:
Yannick Garcin et al. - Hydrogen isotope ratios of lacustrine sedimentary n-alkanes as proxies of tropical African hydrology: new insights from a calibration transect across Cameroon - abstract
Dirk Sachse et al. - INVITED ‘Biological noise' and (paleo)hydrological information in leaf wax lipid D/H ratios - insights from transect studies and greenhouse experiments abstract
- 11/2010:Members of our group have presented their work at the AGU Fall Meeting in Dec 13-18 2010 in San Francisco:
Yannick Garcin et al. - Reconstructing tropical African hydrology using hydrogen isotope ratios of lacustrine sedimentary biomarkers: a calibration transect across Cameroon [Postersession PP21C-1706, Tuesday Dec 14, 8-12.20, Moscone South] - abstract
Lidia Romero-Viana et al. - Changes in the planktonic community of tropical hypersaline Isabela crater-lake as response to climatic variability traced by lipid biomarkers and their stable isotopic composition [Postersession PP21C-1709, Tuesday Dec 14, 8-12.20, Moscone South] -abstract
Dirk Sachse et al. - INVITED Leaf wax lipid D/H ratios of a single species along an environmental gradient on the Big Island of Hawai’i – lessons for the paleorecord [Oral Session PP24B-02, Tuesday Dec 14, 4.15-4:30pm, MW-2005 (Moscone West)] - abstract
- 11/2010 Marlene Bausch will present a poster at the 2010 Australian Organic Geochemistry Conference in Canberra, Dec 7-10
- 6/2010: Olli and Marlene have started their PhD projects
- 10/2009: Our work has been featured in an article in a local newspaper, The Märkische Allgemeine Zeitung based in Potsdam, read the article here (in german only).
Fieldwork sampling a lake in Cameroon in 2009
|Last name||First name||Title||Phone|
|Garcin||Yannick||Dr.||+49 331 977 firstname.lastname@example.org|
|Hoffmann||Bernd||Dipl.-Geol.||+49 331 977 email@example.com|
|van der Veen||Iris||M.Sc.||+49 331 977 firstname.lastname@example.org|
from left to right: Iris van der Veen (PhD student), Michael Pöhle (student helper), Sina Grewe (visiting PhD student), Alex Rohrmann (PhD student), Steffi Tofelde (MSc student), Bernhard Aichner (Postodc), Bernd Hoffmann (PhD student), Dirk Sachse (PI), Yannick Garcin (Postdoc). Not in picture: Saswati Sarkar (PhD student), Oliver Rach (PhD student)
Our laboratory contains all the required equipment for the extraction, separation and identification of biomarker compounds in plants, soils and sediments. Our Isotope Ratio Mass Spectrometer allows the determination of the stable carbon and hydrogen isotope ratios of these individual biomarker compounds.
We typically extract the biomarker compounds of interest (lipids) in our lab using accelerated solvent extraction (ASE) and purify them using wet chemical methods (column chormatography, SPE).
Individual lipid fractions are then being analyzed for lipid identification and quantification on an Agilent GC-MSD/FID system.
Dionex (now ThermoFisher) ASE 350
ThermoFisher Delta V Plus IRMS connected to a Trace 1310 GC for carbon and hydrogen compound-specific isotope analysis of biomarker compounds. In addition, the FlashEA setup can be used for solid sample bulk isotope analysis (C,N,O,H,S) as well as for water isotope analysis (H, O).