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. 2016 Apr 26;6:25061. doi: 10.1038/srep25061

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Copyright © 2016, Macmillan Publishers Limited

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Ice date standard deviation with 95% confidence intervals using a 30-year window for Lake Suwa (A) and Torne River (B). Visualization of a continuous wavelet transform using a Morlet wavelet for Suwa (C) and Torne (D) across the full time series, with warm colors indicating high spectral power and cool colors low power, and with vertical lines indicating the breakpoint as identified in Fig. 1. The time-averaged global wavelet transform showing power distribution across frequency (black lines) with a the 95% level of significance (thin grey lines) over the entire records for early and late periods of Lake Suwa (E) and Torne River (F).