What is the fine-grained topic of the following text: Using measurements of brine volume fraction for 10 cm sections of ice cores taken at the Wenner array site, and various models relating brine volume fraction to conductivity, we compare the predicted conductivity profiles based on the models to the reconstructions from the tomographic measurements. Only return the topic.
Comparing predicted conductivity profiles to tomographic measurements in ice cores based on models relating brine volume fraction.