Preliminary results of a Tibetan stable C-isotope chronology dating from 1200 to 1994

Zimmermann B, Schleser GH, Bräuning A (1997)

Publication Language: English

Publication Status: Published

Publication Type: Journal article

Publication year: 1997

Journal

Isotopes in Environmental and Health Studies Taylor & Francis: STM, Behavioural Science and Public Health Titles / Taylor & Francis

Publisher: Taylor & Francis: STM, Behavioural Science and Public Health Titles / Taylor & Francis

Book Volume: 33

Pages Range: 157-165

Journal Issue: 1-2

URI: http://www.tandfonline.com/doi/abs/10.1080/10256019808036367

DOI: 10.1080/10256019808036367

Abstract

Recently the set up of a stable carbon isotope chronology of juniper tree rings of the eastern Tibet timberline has been iniliated. First results for the last 800 years will be presented.

The dominant δ¹³C pattern shows higher values between 1200 and 1450. Thereafter, a decrease is observed until a minimum is reached at about 1650. Low values are observed until 1750. From then onwards the δ¹³ C values increase again, followed by a sharp decline since around 1900.

Local historical, glaciological, dendrochronological and icecore data suggest that the isotope values mirror a climatic signal between 1200 and 1900. The negative trend in the 20th century can probably be attributed to species specific physiological reactions induced by the anthropogeniocally elevated CO₂ concentration.

Since the tree rings of some time periods are extremely narrow, always 5 tree rings had to be combined. Because of this sampling procedure (pentad sequences) at present the 50 years of instrumentally measured meterological data could not be correlated to the corresponding δ¹³C record.

Authors with CRIS profile

Achim Bräuning Lehrstuhl für Geographie (Physische Geographie)

Involved external institutions

Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ

Germany (DE)

How to cite

APA:

Zimmermann, B., Schleser, G.H., & Bräuning, A. (1997). Preliminary results of a Tibetan stable C-isotope chronology dating from 1200 to 1994. Isotopes in Environmental and Health Studies, 33(1-2), 157-165. https://doi.org/10.1080/10256019808036367

MLA:

Zimmermann, B, Gerhard Hans Schleser, and Achim Bräuning. "Preliminary results of a Tibetan stable C-isotope chronology dating from 1200 to 1994." Isotopes in Environmental and Health Studies 33.1-2 (1997): 157-165.

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