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Journal Article

Direct measurements of deglacial monsoon strength in a Chinese stalagmite

Ian J. Orland, R. Lawrence Edwards, Hai Cheng, Reinhard Kozdon, Mellissa Cross, John W. Valley
Journal: Geology
Published: 01 June 2015
Geology (2015) 43 (6): 555–558.
DOI: https://doi.org/10.1130/G36612.1
... from Kulishu Cave (northeastern China) that grew during the last deglaciation. The new seasonal resolution data show that the stalagmite δ 18 O values record two aspects of regional monsoon dynamics: (1) changes in the isotopic fractionation of water vapor sourced from both the Indian and Pacific...
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Seasonal resolution δ18O analyses and intraband variability across stalagmite BW-1 from Kulishu Cave (northeastern China). Inset: Location of Kulishu Cave (K) near Beijing (B). Dashed line indicates the northern extent of modern summer monsoon influence. Modified from Ma et al. (2012). A: Values of δ18O (Vienna Peedee belemnite, VPDB) categorized by calcite fluorescence (fluor.) and inferred season of growth. Error bars show 2 standard deviations reproducibility. B: Right axis (nonlinear scale) shows the exponent (z value) of a power function with best fit to normalized, intraband δ18O change in bands with three or more analyses (n = 98; 61 bands have 5 or more analyses). Error bars are 2σ of best-fit residuals for bands with four or more analyses. Left axis (linear scale) indicates the resulting integral of each best-fit power function. Horizontal lines show weighted-average (solid blue; see text) z values with weighted 2σ ranges for four periods discussed in text. Axes in B are oriented so up corresponds to greater annual proportion of monsoon rainfall. Ages are before present, A.D. 1950.

Seasonal resolution δ 18 O analyses and intraband variability across stalag...

Published: 01 June 2015
Figure 1. Seasonal resolution δ 18 O analyses and intraband variability across stalagmite BW-1 from Kulishu Cave (northeastern China). Inset: Location of Kulishu Cave (K) near Beijing (B). Dashed line indicates the northern extent of modern summer monsoon influence. Modified from Ma et al. (2012