Oxygen isotope records from ocean cores and ice cores provide some of our best reconstructions of sea level and temperature variability over the Ice Ages. In this lab, you’ll analyze both to explore the patterns, rates, and possible drivers of variability in ice sheets and temperatures.
I. Sea Level and Insolation
Use the record of global ice volume from the oxygen isotopic composition of foraminifera shells in ocean sediments to explore the connection between orbital forcing and sea level over the past 400 kyr (kilo, or thousand, years).
(1) First, graph the record of sea level and describe its basic characteristics: (i) magnitude of changes, (ii) duration of cycles, (iii) when and how much sea level has been higher than today.
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