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Sr/Ca

164-168 (2004).

Sr/Ca ratios in the aragonite skeleton of massive reef corals is one of the principle techniques used to derive past sea surface temperatures (SSTs) (e.g., Beck 1992; Guilderson et al., 1994; Hughen et al., 1999; McCulloch 2000; Correge et al., 2004). The technique is based on an inverse correlation between temperature and Sr/Ca in living corals that is applied to ancient specimens to reconstruct surface temperatures of past oceans. However, interpretation of paleoSST estimates obtained from coral Sr/Ca is confounded by vital effects, (Weber 1973; de Villiers et al., 1995; Cohen et al., 2001; 2002; Felis et al., 2004) which may be substantial relative to the small temperature dependence of Sr/Ca in experimentally produced aragonite crystals (Kinsman and Holland 1969; Dietzel et al., 2004). Because of the long residence times of Sr and Ca in the oceans [5.1 X 106 yr for Ca (Broecker and Peng, 1982)], it has generally been assumed that the Sr/Ca activity ratio has remained essentially constant over the past 100 000 years or so.

164-168 (2004).