Influence of the Indian Ocean Dipole on tree-ring δ18O of monsoonal Southeast Tibet

Hochreuther P, Wernicke J, Grießinger J, Mölg T, Zhu H, Wang L, Bräuning A (2016)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016


Book Volume: 137

Pages Range: 217-230

Journal Issue: 1

DOI: 10.1007/s10584-016-1663-8

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We present a newly developed, annually resolved tree-ring cellulose δO chronology for the southeastern Tibetan Plateau (TP) from Sikkim larch (Larix griffithii), spanning between 1684 and 2012. Comparisons with local and regional climate data reveal strong positive correlations with monthly sunshine hours, temperature and daily temperature amplitude as well as strong negative correlations with relative humidity, vapor pressure, rain days per month and cloud cover of August. Relationships with local and regional tree-ring δO chronologies are stable and highly significant. Over the 20th century, we find no long-term climatic trends. This is consistent with other tree-ring δO chronologies of other tree species south of the Himalayas, but contrasts with results from isotope studies north of the Himalayas. This suggests stable macroclimatic flow patterns throughout the last centuries for the southern tree stands. In terms of large-scale climate dynamics, we find evidence of a significant 30-year wave influencing our tree-ring oxygen chronology, most probably induced by the Indian Ocean Dipole and influencing tree-ring oxygen isotope chronologies along the southeastern Himalaya and the southeastern rim of the TP. This pattern is spatially and temporarily consistent among the chronologies and has apparently strengthened during the last century. During periods of strong positive dipole mode activity, the dipole mode index shows positive correlations with the δO of tree-rings on the southeastern TP.

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Hochreuther, P., Wernicke, J., Grießinger, J., Mölg, T., Zhu, H., Wang, L., & Bräuning, A. (2016). Influence of the Indian Ocean Dipole on tree-ring δ18O of monsoonal Southeast Tibet. Climatic Change, 137(1), 217-230.


Hochreuther, Philipp, et al. "Influence of the Indian Ocean Dipole on tree-ring δ18O of monsoonal Southeast Tibet." Climatic Change 137.1 (2016): 217-230.

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