Marc Weynell

weynell_profil_bild
Address Geochemistry
Malteser Straße 74-100
Room Room 241, Building B
Telephone +49 (0)30-83870211
Email marcwey@zedat.fu-berlin.de

Office hours

Research interest

  • Tracing weathering and erosion processes by application of stable isotopes and element mass fractions
  • Lithium isotope fractionation during low-temperature water-rock-exchange
  • Lake and river chemistry and implications for paleo records
  • Water balances of lakes: moisture sources, moisture pathways, and in-lake processes by application of oxygen, hydrogen, and carbon (DIC) isotopes
  • Sources and sinks of sulfate in groundwater

Work experience


 Since 2014     Ph.D. student at Geochemistry group, Department of Earth Sciences,

                        Freie Universität Berlin, Germany

PhD-project: Chemical and Isotopic (Li, H, O, C) Composition of surface water and sediments - Implications on weathering, erosion, and paleoenvironmental reconstructions on the Tibetan Plateau (advisor: Uwe Wiechert)

                        DFG-project: SPP1372: Tibetan Plateau: Formation-Climate-Ecosystems

Since 2014      Work as educator with mentally and physically handicapped persons;

                        Lebenshilfe Berlin gGmbH, Germany                      

2011 – 2014    Researcher at Paleontology group, Department of Earth Sciences,

                        Freie Universität Berlin, Germany

                        DFG-project: SPP1372: Tibetan Plateau: Formation-Climate-Ecosystems

2010 – 2011    Researcher at Hydrogeology group, Department of Earth Sciences,

                        Freie Universität Berlin, Germany

                        Project: Sulfate concentrations in groundwater of Berlin: Identifying of

                        sources and sinks

1997 – 2004    Work as educator with mentally and physically handicapped persons; 

                        Diakonie Schleswig-Holstein, Germany

Education


 

Since 10/2014             Ph.D. Student, Freie Universität Berlin

04/2010                       Master (MSc.) in Geological Sciences, Freie Universität Berlin 

                                    Title of the thesis: “Isotopic patterns of surface waters on the northern                            

                                    and southern Tibetan Plateau”         

09/2007                       Bachelor (BSc.) in Geological Sciences, Freie Universität Berlin

                                    Title of the thesis: “REE-concentrations of peridotites and pyroxenites of                        

                                    the Swiss Totalp massif”                  

06/2001                       State Certified Educator, College of social education, Hamburg

Research

Weathering and erosion on the Tibetan Plateau and implications on the global carbon cycle

Sources and sinks of sulfate in groundwater of the city of Berlin, Germany

Sources and transport paths of moisture on the Tibetan Plateau

 

Analytical abilities

Mass-spectrometry (Gas‑MS MAT‑253; ICP‑MS element XR; MC‑ICP‑MS Neptune)

Stable isotope analytics (sampling, lab procedure, measurements, and data evaluation) of lithium, sulfate (S, O), nitrogen (N, O), water (H, O), and carbon (C, O) isotopes

Highly siderophile element (HSE) lab analytics

 

International fieldwork

2012    Lake Bangong Co, western Tibetan Plateau, PR China

2011    Lake Donggi Cona, northeastern Tibetan Plateau, PR China

2008    Lakes and streams on the southern, central, and eastern Tibetan Plateau, PR China

In peer reviewed journals:

 

Weynell, M., Wiechert, U, Schuessler, J.A. (2017): Lithium isotopes and implications on chemical weathering in the catchment of Lake Donggi Cona, northeastern Tibetan Plateau. Geochimica et Cosmochimica acta, in press.

Weynell, M., Wiechert, U, Zhang, C. (2016): Chemical and isotopic (O, H, C) composition of surface waters in the catchment of Lake Donggi Cona (NW China) and implications for paleoenvironmental reconstructions. Chemical Geology 435, 92‑107.

Mischke, S., Weynell, M., Zhang, C., Wiechert, U. (2013): Spatial variability of 14C reservoir effects in Tibetan Plateau lakes. Quaternary International 313‑314, 147‑155.

Taft, L., Wiechert, U.,Riedel, F., Weynell, M., Hucai, Z. (2013): Oxygen and carbon isotope patterns archived in shells of the aquatic gastropod Radix: Hydrologic and climatic signals across the Tibetan Plateau in sub-monthly resolution. Quaternary International 290‑291, 282-298.

Taft, L., Wiechert, U.,Riedel, F., Weynell, M., Hucai, Z. (2012): Sub-seasonal oxygen and carbon isotope variations in shells of modern Radix sp. (Gastropoda) from the Tibetan Plateau: potential of a new archive for palaeoclimatic studies. Quaternary Science Reviews 34, 44‑56.

 

In international conferences:

Weynell, M., Wiechert, U., Schuessler, J.A. (2015): Lithium Isotope Ratios of Waters and Sediments of Lake Bangong, Western Tibetan Plateau. 25th Goldschmidt Conference

Weynell, M., Wiechert, U., Schuessler, J.A. (2013): Lithium Isotope Variation in Waters and Sediments from Lake Donggi Cona and its Catchment, China. 23rd Goldschmidt Conference

Weynell, M., Wiechert, U., Riedel, F., Taft, L., Hucai, Z. (2010): Oxygen und Hydrogen Isotope Patterns of Surface Waters on the Tibetan Plateau: Implications on Sources and Transport Paths. AGU fall meeting 2010