%0 Journal Article %T Last Glacial Maximum and deglacial abyssal seawater oxygen isotopic ratios %A Wunsch %A Carl %J - %D 2016 %R https://doi.org/10.5194/cp-12-1281-2016 %X

Abstract. An earlier analysis of pore-water salinity (chlorinity) in two deep-sea cores, using terminal constraint methods of control theory, concluded that although a salinity amplification in the abyss was possible during the LGM, it was not required by the data. Here the same methodology is applied to 汛¹⁸O_w in the upper 100ˋm of four deep-sea cores. An ice volume amplification to the isotopic ratio is, again, consistent with the data but not required by it. In particular, results are very sensitive, with conventional diffusion values, to the assumed initial conditions at ˋ100ˋky and a long list of noise (uncertainty) assumptions. If the calcite values of 汛¹⁸O are fully reliable, then published enriched values of the ratio in seawater are necessary to preclude sub-freezing temperatures, but the seawater 汛¹⁸O in pore fluids does not independently require the conclusion.