Warming of the Antarctic ice-sheet surface since the 1957 International Geophysical Year

摘要

In this Letter, we reported trends on reconstructed temperature histories for different areas of the Antarctic continent. The confidence levels on the trends, as given in the text, did not take into account the reduced degrees of freedom in the time series due to autocorrelation. We report in Table 1 the corrected values, based on a two-tailed f-test, with the number of degrees of freedom adjusted for autocorrelation, using N_(effective) = N(l - r)/( 1 + r), in which Nis the sample size and r is the lag-1 autocorrelation coefficient of the residuals of the detrended time series. The median of r is 0.27, resulting in a reduction in the degrees of freedom from N = 600 to N_(effective) = 345 for the monthly time series.