Author： Yang Meixue Yao Tandong Gou Xiaohua Wang Huijun Neumann Thomas
Publisher： International Glaciological Society
ISSN： 1727-5644
Source： Annals of Glaciology, Vol.43, Iss.1, 2006-09, pp. : 132-136
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Abstract
Ice cores contribute important records of past climate changes. As one of the thickest ice caps in central Asia, the Guliya ice cap (35° 17′ N, 81° 29′ E) provides valuable information for this critical region about the past climate and environment changes. We used wavelet analysis to examine periodic temperature and precipitation oscillations over the past 1700 years recorded in the Guliya ice core. The results show non-linear oscillations in the ice-core records, with multiple timescales. Temperature records indicate persistent oscillations with periodicities of approximately 200, 150 and 70 years. Precipitation records show significant periodicities at 200, 100, 150 and 60 years. However, the amplitude modulation and frequency vary with time. Wavelet analysis can explore these time series in greater detail and furnish additional useful information.
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