Roland MäusbacherGerhard Daut & Torsten Haberzettl

Chinese partners: ZHU Liping, WANG Junbo & KANG Shichang (all ITP)

 

1.1 Summary

The overall aim of this project is to reconstruct changes in the hydrological cycle indicating past monsoon variability in the southern and central part of Tibet. All together four lake systems (Nam Co, Puma Yumco, Tangra Yumco and Mapam Yumco) along an E-W transect with different moisture supply related to strength and penetration of the monsoon will be investigated with subbottom profiling, core analyses and onshore mapping. Using hydro acoustic techniques submerged beach remains indicating a more negative water balance than today and faults pointing to seismic activity will be detected. In addition basin morphology, sediment distribution and sediment stratigraphy will be used to trace changes in the sedimentary pattern and identify representative core locations. Geochemical, sedimentological and geophysical data derived from core analyses are part of the multiproxy dataset, which will show changes in the sedimentary regime and hydrology, indicating changes in moisture supply. A detailed chronology for the cores will be established, enabling us to detect differences in the sedimentary history on a centennial scale

 

1.2 Work Package 2008 - 2010

 

According to the proposal an annual exchange of German and Chinese scientists was planned to enhance communication and to transfer knowledge between German and Chinese partners. Furthermore shared field campaigns in Central and Southern Tibet should provide seismic survey data and coring material for sedimentological and geochemical investigations on sediment dynamics of different lake systems in the southern transect.

Referring to the first aim it can be stated that an exchange of young scientists from both sides could be realized in a very convincing way. From ITP CAS Prof. Liping Zhu and Dr. Junbo Wang visited German project partner institutions in Jena and Braunschweig from February 2009 to May 2009. Our PhD candidate Dipl.-Geogr. Stefan Doberschütz was invited to the 6th Sino-German Workshop on Tibetan Plateau Research and the 1st Sino-German Summer School on Tibetan Plateau Research in Qingdao, China in October 2009. During these meetings, PhD candidate Peng Ping was invited by Dr. Peter Frenzel (FSU Jena/ TU Braunschweig) to work on ostracod assemblages in Jena from December 2009 to March 2010. Furthermore, in February 2010 Dr. Xinmiao Lu visited Jena to prepare pollen samples of the Nam Co piston core.

The first field campaign of the project was realized in September 2008. Customs regulations caused a considerable time delay during the return transport of core material, so that the onset of core sampling in our laboratories had to be shifted to spring 2009. The initial core sampling party of all sino-german project partners in Jena was finally realized on February 18th. Chinese partners were represented by Prof. Liping Zhu and Dr. Junbo Wang. Project partners of the northern transect were represented by Dr. Stephan Opitz (Alfred-Wegener Institute, Potsdam). In close cooperation with Dr. Peter Frenzel (FSU Jena/ TU Braunschweig), Dr. Gerd Gleixner (MPI Jena) and Dipl.-Geoökol. Claudia Wrozyna (TU Braunschweig) a sampling scheme was developed and applied on long core NC 08/01.

 

1.2.1 Field work 2008

 

Lake Nam Co

During the field campaign in September 2008, several gravity resp. piston cores were obtained from a platform of Chinese colleagues of ITPCAS, using a modified gravity corer of Meischner & Rumohr (1974) and a Uwitec piston corer (diameter of 90 mm) respectively. Latter, which was financed through the project, allowed discontinuous drilling of segments up to 2 meters long even under rough conditions (heavy sea), generating undisturbed and overlapping sediment sequences for future analysis. Piston core NC 08/01 (30°44,245'N; 90°47,420' E; 4734 m above sea level; gps precision: 6 m) originates from the southern central part of lake Nam Co (fig. 1) in a water depth of approx. 93 meters. Captured sediment strata of core NC 08/01 comprise a total length of 11 meters.

 

Fig. 1: Bathymetric map of Nam Co including coring position of long core NC 08/01 (red dot). Source: WANG ET AL. 2009, modified by DOBERSCHÜTZ.

Lake Puma Yumco

At Puma Yumco, seismic profiling was possible (fig. 2a; 105 km profile length in total), enabling Chinese colleagues to create a bathymetrical map of Puma Yumco. In addition, a recovery of six short sediment cores, 13 surface sediment samples and 38 lake water samples can be reported. Further 70 samples of water and sediment were used for the establishment of transfer functions between ostracod type and environment factors. Piston cores were realized by our Chinese project partners.

 

1.2.2 Field work 2009

 

In 2009, a lake survey was conducted to find the best drilling site for the second period of the project. Due to a travel time of 6 days to Lake Mapam Yumco, only the subbottom profiling for this lake was possible (fig 2b). In addition, surface sediment samples and a gravity core were taken. Chinese partners will construct a bathymetrical map of the depth information. The subbottom data will be analyzed in Jena. On Lake Tangra Yumco, bathymetrical mapping was performed by our Chinese partners.

 

Fig. 2a: Subbottom profiling track lines of Lake Puma Yumco.

 

 

 

Fig. 2b: Subbottom profiling track lines of Lake Mapam Yumco.

1.2.3 Field work 2010

Lake Tangra Yumco

At Tangra Yumco first seismic profiles were recorded for seismic stratigraphy interpretation and for taking first sediment gravity cores. Altogether ~60 km of profiles were recorded. The general pattern shows three distinguishable acoustic units for the deepest part of the northern lake basin.

Additionally, several gravity (German efforts) and piston cores (Chinese efforts) were obtained, with field lengths between 54 and 168 cm for the gravity cores and 240 as well as 260 cm for the piston cores. In general, Tangra Yumco gravity cores, especially from the northern basin, show a clear lamination. Up to now it is still unclear whether these layers origin from annual layering, event layering or combinations of both.

18 recent aquatic as well as terrestrial plants were collected in the field around the lake. One recent aquatic plant was radiocarbon dated for the ascertainment of the recent carbon reservoir effect. This effect was determined to be 2070 ± 40 BP. According to a first reservoir corrected radiocarbon age of 4120 +115/-140 cal BP at the bottom of a 1.68 m gravity core from Tangra Yumco we assume a similar sedimentation rate as well as similar changes in sedimentation as in Lake Nam Co. Water and sediment samples from inflows into the lake and samples from a water profile in the lake itself were collected. The obtained samples were analyzed in the field regarding temperature, pH, conductivity, content of oxygen and alkalinity.

Fig.3: Lake Tangra Yumco 2010 field campaign

2. References

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  • Dewane, T.J., Stockli, D.F., Hager, C., Taylor, M., Ding, L., Lee, J., Wallis, S., 2006, Timing of Cenozoic E–W Extension in the Tangra Yum Co–Kung Co Rift, South-Central Tibet. EOS Trans. AGU, 87 (52), Fall meeting, Abstract T34C-04.
  • Fleitmann, D., Burns, S.J., Mangini, A., Mudelsee, M., Kramers, J., Villa, I., Neff, U., Al-Subbary, A.A., Buettner, A., Hippler, D., Matter, A., 2007. Holocene ITCZ and Indian monsoon dynamics recorded in stalagmites from Oman and Yemen (Socotra). Quaternary Science Reviews 26, 170-188.
  • Gasse, F., J.C. Fontes, E. VanCampo, and K. Wei (1996): Holocene environmental changes in Bangong Co basin (western Tibet) .4. Discussion and conclusions, Palaeogeography Palaeoclimatology Palaeoecology, 120 (1-2), 79-92.
  • Gupta, A.K., Anderson, D.M., Overpeck, J.T., 2003. Abrupt changes in the Asian southwest monsoon during the Holocene and their links to the North Atlantic Ocean. Nature 421, 354-357.
  • Herzschuh, U., 2006. Palaeo-moisture evolution in monsoonal Central Asia during the last 50,000 years. Quaternary Science Reviews 25, 163-178.
  • Kaiser, K., Schoch, W.H., Miehe, G., 2007. Holocene paleosols and colluvial sediments in Northeast Tibet (Qinghai Province, China): Properties, dating and paleoenvironmental implications. Catena 69, 91-102.
  • Kong, P., Na, C.G., Fink, D., Huang, F.X., Ding, L., 2007. Cosmogenic Be-10 inferred lake-level changes in Sumxi Co Basin, Western Tibet. Journal of Asian Earth Sciences 29, 698-703.
  • Liu, Z.H., Henderson, A.C.G., Huang, Y.S., 2006. Alkenone-based reconstruction of late-Holocene surface temperature and salinity changes in Lake Qinghai, China. Geophysical Research Letters 33, L09707, doi:10.1029/2006GL026151.
  • Miehe, G., Miehe, S., Schlutz, F., Kaiser, K., Duo, L., 2006. Palaeoecological and experimental evidence of former forests and woodlands in the treeless desert pastures of Southern Tibet (Lhasa, AR Xizang, China). Palaeogeography Palaeoclimatology Palaeoecology 242, 54-67.
  • Morrill, C., 2004. The influence of Asian summer monsoon variability on the water balance of a Tibetan lake. Journal of Paleolimnology 32, 273-286.
  • Mügler, I., Gleixner, G., Günther, F., Mäusbacher, R., Daut, Schütt, B., Berking, J., Schwalb, A., Schwark, L., Xu, B., Yao, T., Zhu, L., Yi, C., 2009. A multi-proxy approach to reconstruct hydrological changes and Holocene climate development of Nam Co, Central Tibet. J. Paleolim. DOI 10.1007/s10933-009-9357-0.
  • Overpeck, J., Anderson, D., Trumbore, S., Prell, W., 1996. The southwest Indian Monsoon over the last 18000 years. Climate Dynamics 12, 213-225.
  • Sirocko, F., Sarnthein, M., Erlenkeuser, H., Lange, H., Arnold, M. & Duplessy, J. C., 1993. Century scale events in monsoonal climate over the past 24.000 years. Nature 364, 322-324.
  • Thompson, L.G., Yao, T., Mosley-Thompson, E., Davis, M.E., Henderson, K.A., Lin, P.N., 2000. A high-resolution millennial record of the South Asian Monsoon from Himalayan ice cores. Science 289, 1916-1919.
  • Wei, Z., Zhijiu, C., Yonghua, L., 2006. Review of the timing and extent of glaciers during the last glacial cycle in the bordering mountains of Tibet and in East Asia. Quaternary International 154-155, 32-43.
  • Yao, T.D., Shi, Y.F., Thompson, L.G., 1997. High resolution record of paleoclimate since the little ice age from the tibetan ice cores. Quaternary International 37, 19-23.
  • Zhu, D.G., Meng, X.G., Zhao, X.T., Shao, Z.G., Xu, Z.F., Yang, C.B., Ma, Z.B., Wu, Z.G., Wu, Z.H., Wang, J.P., 2004. Evolution of an ancient large lake in the southeast of the northern Tibetan Plateau. Acta Geologica Sinica-English Edition 78, 982-992.

3. Scientific Outcome

a) Scientific Publications

  • Daut, G., Mäusbacher, R., Baade, J., Gleixner, G., Kroemer, E., Mügler, I., Wallner, J., Wang, J. & Zhu, L. (2009): Lake level changes as an expression of a changing hydrological cycle on Nam Co (Tibetan Plateau, China). QI. DOI 10.1007/s10201-009-0266-8.
  • Mügler, I., Gleixner, G., Mäusbacher, R., Daut, G., Schütt, B., Berking, J., Schwalb, A., Schwark, L., Xu, B., Yao, T., Zhu, L., Yi, Ch. (2009): A multi-proxy approach to reconstruct hydrological changes and Holocene climate development of Nam Co, Central Tibet. Journal of Palaeolimnology. DOI 10.1007/s10933-009-9357-0.
  • Wang, J., Zhu, L., Daut, G., Ju, J., Lin, X., Wang, Y. & Zhen, X. (2009): Investigation of Bathymetry and water quality on the largest lake in Tibet-Nam Co, located in central Tibetan Plateau, China. Limnology. DOI 10.1007/s10201-009-0266-8.
  • Zhu, L., Wang, J., Lin, X., Ju, J., Xie, M., Wu, Y., Li, M., Mäusbacher, R., Schwalb, A. & Daut, G. (2008): Environmental changes reflected from the core sediments since 8.4 ka in Nam Co, Central Tibet of China. Holocene, 18.

b) Conference Contributions

2011:

Daut, G., S. Doberschütz, T. Haberzettl, Th. Kasper, R. Mäusbacher, J. Wang & L. Zhu (2011): Lake System Response to Late Quaternary Monsoon Dynamics on the Tibetan Plateau: A shallow seismic survey at four lakes on the Tibetan Plateau, China – a synthesis. 7th Sino-German Workshop on Tibetan Plateau Research, Hamburg, Germany. [poster]

Daut, G., T. Haberzettl, S. Doberschütz, Th. Kasper, G. Gleixner, P. Frenzel, R. Hetzel, K. Reicherter, A. Schwalb, T. Schwenk, V. Spieß, J. Wang, L. Zhu & R. Mäusbacher (2011): Nam Co - a potential ICDP drilling site on the Tibetan Plateau? – 2011 IODP/ICDP Colloquium, Münster, Germany. [oral presentation]

Doberschütz, S., G. Daut, T. Haberzettl, Th. Kasper , R. Mäusbacher, J. Wang, V. Wennrich & L. Zhu (2011): Reconstruction of Late Glacial and Holocene paleo-monsoon dynamics by means of lacustrine sediments of Lake Nam Co, Tibetan Plateau, China. 7th Sino-German Workshop on Tibetan Plateau Research, Hamburg, Germany. [poster]

Frenzel, P., G. Daut, S. Ferse, M. Frechen, T. Haberzettl, R. Hetzel, P. Hoelzmann, T. Kasper, D. Lin, R. Mäusbacher, S. Mischke, I. Möbius, P. Ping, K. Reicherter, S. Schmidt, A. Schwalb, A. Schwarz, J. Wang, T. Wiatr, C. Wrozyna & L. Zhu (2011): The Tangra Yumco lake system (central Tibetan Plateau) and first insights into its Quaternary lake level variation. 7th Sino-German Workshop on Tibetan Plateau Research, 3-5 March 2011, Hamburg, Germany. [oral presentation]

Haberzettl, T, G. Daut, S. Doberschütz, Th. Kasper, G. Gleixner, P. Frenzel, R. Hetzel, K. Reicherter, A. Schwalb, T. Schwenk, V. Spieß, J. Wang, L. Zhu & R. Mäusbacher (2011): Nam Co - a potential ICDP drilling site on the Tibetan Plateau? – 2011 IODP/ICDP Colloquium, Münster, Germany. [poster]

Haberzettl, T., Th. Kasper, G. Daut, S. Doberschütz, N. Nowaczyk, J. Wang, L. Zhu & R. Mäusbacher (2011): Improving Tibetan lake sediment chronologies using magnetostratigraphy: an example from Nam Co. 7th Sino-German Workshop on Tibetan Plateau Research, Hamburg, Germany. [poster]

Haberzettl, T., Th. Kasper , S. Doberschütz, G. Daut, R. Mäusbacher, J. Wang, L. Zhu & N. Nowaczyk (2011): Lateglacial and Holocene monsoon dynamics on the central Tibetan Plateau as recorded in sediments of lake Nam Co - XVIII INQUA Congress 2011, 21-27 July 2011, Bern, Switzerland. [oral presentation]

Kasper, Th., T. Haberzettl, G. Daut, R. Mäusbacher, J. Wang & L. Zhu (2011): Lake Tangra Yumco – Coring and first results of core processing. 7th Sino-German Workshop on Tibetan Plateau Research, Hamburg, Germany. [poster]

Kasper, Th., T. Haberzettl, P. Frenzel, P. Peng, C. Wrozyna, G. Daut, R. Mäusbacher, J. Wang & L. Zhu (2011): Lake Tangra Yumco (central Tibetan Plateau, China) as a climate archive for the reconstruction of monsoon variability - XVIII INQUA Congress 2011, 21-27 July 2011, Bern, Switzerland. [poster]

Long, H., Z. Lai , M. Fuchs, T. Haberzettl & J. Wang (2011): High-resolution OSL chronology for a sediment core from Lake Nam Co on the southern Tibetan Plateau: Implication for lake evolution since the late Glacial. XVIII INQUA Congress 2011, 21-27 July 2011, Bern, Switzerland. [poster]

Long, H., Z. Lai, P. Frenzel, M. Fuchs, T. Haberzettl & J. Zhang (2011): Holocene moist period recorded by the chronostratigraphy of a lake sedimentary sequence from Lake Tangra Yumco on the south Tibetan Plateau. 13th International Conference on Luminescence and Electron Spin Resonance Dating. 10-14 July 2011, Torun, Poland. [poster]

Möbius, I., P. Frenzel, T. Haberzettl, P. Hölzmann, B. Plessen, A. Schwalb & C. Wrozyna (2011): Multi-proxy analysis of lake sediments at Tangra Yumco (central Tibetan Plateau) – Holocene lake level and climate variability. 7th Sino-German Workshop on Tibetan Plateau Research, 3-5 March 2011, Hamburg, Germany. [poster]

Reicherter, K., T. Wiatr, T. Haberzettl, S. Schmidt, Th. Kasper & P. Frenzel (2011): Active tectonics in the northern Tangra Yumco Basin (central Tibet). EGU General Assembly 2011, Vienna, Austria. [poster]

Reicherter, K., T. Wiatr, T. Haberzettl, S. Schmidt, Th. Kasper & P. Frenzel (2011): Active tectonics in the northern Tangra Yum Co Basin (central Tibet, VR China). XVIII INQUA Congress 2011, 21-27 July 2011, Bern, Switzerland. [poster]

Reicherter, K., T. Wiatr, T. Haberzettl, S. Schmidt, Th. Kasper & P. Frenzel (2011): Neo-tectonics and Quaternary lake evolution of Tangra Yumco, central Tibetan Plateau. 7th Sino-German Workshop on Tibetan Plateau Research, Hamburg, Germany. [poster]

Wang, J., L. Zhu, P. Peng, Q. Ma, Y. Wang, X. Lin, G. Daut, T. Haberzettl & Th. Kasper (2011): Modern sedimentation rates and a preliminary study on 14C chronology of core sediments and an outcrop from Lake Tangra Yumco, Northern Tibet, China. 7th Sino-German Workshop on Tibetan Plateau Research, Hamburg, Germany. [poster]

Wrozyna, C., A. Schwalb, G. Daut, S. Doberschütz, P. Frenzel, G. Gleixner, F. Günther, T. Haberzettl, T. Kasper, A. Lödige, R. Mäusbacher, J. Wang, M. Xie & L. Zhu (2011): Multi-proxy studies on Holocene lake level variation and monsoon dynamics in Lake Nam Co, southern Tibetan Plateau. 7th Sino-German Workshop on Tibetan Plateau Research, 3-5 March 2011, Hamburg, Germany. [oral presentation]

2010:

Doberschütz, S., G. Daut, Th. Kasper , R. Mäusbacher, J. Wang & L. Zhu (2010): Late Quaternary climate change on the Tibetan Plateau inferred from a22.500 cal. BP lake sediment record of Nam Co, Central Tibet, China - 2010 EGU General Assembly Vienna, Austria. [oral presentation]

Doberschütz, S., G. Daut, T. Haberzettl, Th. Kasper , R. Mäusbacher, J. Wang & L. Zhu (2010): Reconstruction of Late Glacial paleo-monsoon dynamics using lacustrine sediments of Lake Nam Co, Tibetan Plateau, China - 2010 AGU Fall Meeting San Francisco, USA. [poster]

Gleixner, G., F. Günther, R. Mäusbacher, G. Daut, S. Doberschütz, T. Haberzettl, B. Schütt, A. Schwalb, P. Frenzel, S. Mischke, C. Wrozyna, T. Yao, B. Xu, L. Zhu, S. Kang, C. Yi & S. Wagner (2010): Lake System Response to Late Quaternary Monsoon Dynamics on the Tibetan Plateau. 2010 AGU Fall Meeting, 13–17 December 2010, San Francisco, USA. [oral presentation]

Haberzettl, T., Th. Kasper , G. St-Onge, H. Behling, G. Daut, S. Doberschütz, W. Kirleis, R. Mäusbacher & N. Nowaczyk (2010): Improving late Holocene radiocarbon-based chronologies by matching paleomagnetic secular variations to geomagnetic field models - Examples from Nam Co (Tibet) and Lake Kalimpaa (Sulawesi) - 2010 AGU Fall Meeting San Francisco, USA. [poster]

Kasper, Th., S. Doberschütz, R. Mäusbacher, G. Daut, P. Frenzel, V. Wennrich, J. Wang & L. Zhu (2010): A multi-proxy approach for the investigation of climate changes over the last 3 ka in the Nam Co area (Xining, China) using lake sediments - 2010 EGU General Assembly Vienna, Austria. [poster]

Kasper, Th., T. Haberzettl, S. Doberschütz, G. Daut, R. Mäusbacher, J. Wang, L. Zhu & V. Wennrich (2010): Monsoon variability for the past 4 ka derived from high-resolution analyses of sediments from Lake Nam Co, central Tibetan Plateau - 2010 AGU Fall Meeting San Francisco, USA. [poster]

2009

Daut, G., Doberschütz, S., Mäusbacher, R., Wagner, B., Junbo Wang & Liping Zhu (2009): A 25000 years sedimentary record reflecting monsoon dynamic at lake Nam Co (Tibet, China). 11th International Paleolimnology Symposium December 14 – 18, 2009, Guadalajara, Mexico. [oral presentation]

Daut, G., Mäusbacher, R., Doberschütz, S., Gleixner, G., Liping Zhu & Junbo Wang (2009): Report on Nam-Co expedition (southern transect) in summer 2008. 6th Sino-German Workshop on Tibetan Plateau Research. Qingdao, China. [oral presentation]

Daut, G., Mäusbacher, R., Doberschütz, S., Kasper, T., Liping, Zhu & Junbo Wang (2009): Report on Nam-Co expedition (southern transect) in summer 2008. Internal Workshop on projects dealing with "Late Quaternary Landscape and Lake development on the Tibetan Plateau" in the framework of DFG Priority Programme "Tibetan Plateau: Formation, Climate, Ecosystems" 8. - 9. January 2009, Alfred Wegener Institute for Polar and Marine Research, Potsdam. Germany. [oral presentation]

Günther, F., Gleixner G., Mäusbacher R., Daut, G., B. Xu & T. Yao (2009): A paleoclimate reconstruction for Nam Co using compound-specific hydrogen isotope ratios of n-alkanes in comparison with δ18O values from Dasuopu ice core. 11th International Paleolimnology Symposium December 14 – 18, 2009, Guadalajara, Mexico. [poster]

Mäusbacher, R., Daut, G., Doberschütz, S., Gleixner, G., Kroemer, E., Mügler, I., Wallner, J., Liping, Zhu & Junbo Wang (2009): Late Quaternary lake level changes as an expression of a changing hydrological cycle on Nam Co (Tibetan Plateau). 5th International Symposium on Tibetan Plateau Research and 24th Himalaya-Karakorum-Tibet Workshop (HKT) on August 11 to 14, 2009, Beijing. China. [oral presentation]

c) Theses

Master thesis of Franziska Günther (M.Sc.) (title: "Hochauflösende Rekonstruktion des Paläoklimas des Nam Co (Zentraltibet) anhand der Wasserstoffisotopenverhältnisse von n-Alkanen im direkten Vergleich zu den δ18O-Werten des Dasuopu-Eiskernes").

Master thesis of Thomas Kasper (M.Sc.) (title: "The evaluation of established climate-proxies for paleoclimate-reconstruction on lake sediments of Nam Co, southeastern Tibetan Plateau (China)").

PhD thesis of Dipl.-Geogr. Stefan Doberschütz (working title: "Lake sediments of Nam Co as natural geoarchives for Holocene monsoon dynamics on the Tibetan Plateau").

d) Public Relations

•Publications in local and national German newspapers (TLZ, OTZ, Spiegel Online)

•Television broadcast on local TV-channel (Jena-TV)

4. Links

FSU Jena, Institut für Geographie

ITP CAS

4.1 Press

http://www.academicworld.net/index.php?id=1847

http://www.uni-jena.de/uni_journal_4_2009_forschungsprojekte.html

http://www.spiegel.de/fotostrecke/fotostrecke-40736-11.html