Paleoceanography Problem 1 | Massachusetts Institute of Technology - Edubirdie

University:
Massachusetts Institute of Technology
Course:
12.740 | Paleoceanography
Academic year:

2023
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429

Pages:

1
Author:

mesuravi53t

PALEOCEANOGRAPHY Problem Set 1 1. Given the mass balance equations: Moδo + Miδi = constant ∆Mi/ Ao = ∆(Sea level) a particular δ18O paleotemperature curve (Shackleton, 1974, linear curve fit to Uvigerina data): T = 16.9 - 4.0(δc-δw) assuming that: the mean δ18O of glacial ice was -30 to -40 ‰ and given that: Mo(now) = 1.4 x 1021 kg @ an average density of 1.03 g/cm3 Ao = 361 x 106km2 the mean salinity of the ocean today is 34.7 ‰ sea level was 120 m lower during the last glacial maximum The isotopic composition of interglacial benthic carbonate is 3.5‰ (with respect to PDB). The isotopic composition of glacial benthic carbonate is 5.1‰ (with respect to PDB). (note: to convert SMOW to PDB scale, δ w (PDB) = δw (SMOW) - 0.2) Calculate: a. The salinity of the glacial ocean. b. The change in mean deep ocean temperature during the last glacial maximum, and how sensitive it is to your assumption about the isotopic composition of glacial ice.

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