Technical Comments

Comment on “A 12-million-year temperature history of the tropical Pacific Ocean”

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Science  19 Dec 2014:
Vol. 346, Issue 6216, pp. 1467
DOI: 10.1126/science.1257618
Fig. 2 Tropical Pacific SST records extending from 5 Ma to present.

(A) SST records from all sites that have both Embedded Image and TEX86 data: WEP site 806 (7), EEP cold tongue site 850 (7), and Eastern warm-pool site 1241 (11). Solid lines are the modern SST at each site, and dashed lines are the SST limit for the Embedded Image proxy. The cold bias of TEX86 is apparent at all sites but is less severe at site 806 where the thermocline is deepest. (B) All records from the WEP and EEP cold tongue excluding site 850 TEX86 data because of the severe cold bias due to subsurface production of GDGTs. See Table 1 for references. (C) WEP – EEP SST difference calculated by interpolating and resampling all records to 50K resolution and subtracting them from each other. The smoothed curves are generated using a locally weighted least squares (0.25 smoothing parameter) method: (black dots and thick black curve) available Mg/Ca and Embedded Image data published before Zhang et al. (7) [WEP site 806 (4) minus the average of EEP sites 846 (6), 847 (4, 8), and U1338 (10)]; (red dots) new Zhang et al. WEP site 806 TEX86 minus EEP site 850 Embedded Image; (thin colored lines) different combinations of previously published data from WEP and EEP sites. WEP site 806 Embedded Image data are saturated and therefore are not used to calculate east-west SST difference.