The Warming Papers by David Archer

Author:David Archer
Language: eng
Format: epub
Publisher: John Wiley & Sons
Published: 2013-04-24T16:00:00+00:00

Having corrected the MAT data, we can now estimate the SST corrections required to ensure overall compatibility between the land, MAT and SST data by comparing the corrected MAT and raw SST values. Table 2 and Fig. 3 show the hemispheric mean differences between the corrected MAT data and the raw SST data. As with the MAT analysis, three distinct periods can be discerned: pre-1890 when the SST data are slightly but consistently cooler than the MAT data; 1903–41 when SSTs are markedly cooler than MATs; and post-1945 when there is no consistent difference. Rather complex transitions exist between these three phases. The MAT-SST difference curves are essentially the same in both hemispheres. This is a strong indication that the differences reflect non-climatic effects, and it provides a valuable consistency check on the MAT corrections.

The implied SST corrections, are (°C): 1861–89,0.08; 1903–41, 0.49; 1942–45, –0.10; 1946–79, 0.0; with linear interpolation between 1889 and 1903. For 1941 we applied a slightly different correction in the Southern Hemisphere, 0.19 °C. As for MAT, these corrections also differ somewhat from those used by Folland et al.4 In their analysis, SST values were adjusted to ensure compatibility with corrected MAT values, just as we have done. However, since their corrected MAT values must differ noticeably from those produced here, differences in the SST corrections will, in part, reflect these MAT differences.

Fig. 3. Temperature differences: corrected marine air temperatures minus uncorrected sea surface temperatures for the Northern (a) and Southern (b) Hemispheres. Smooth curves show 10-yr gaussian filtered values.

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