June 28, 2017
DoGS postdoc Alice Marzocchi and assistant professor Malte Jansen have recently published the paper “Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations” in Geophysical Research Letters. The study investigates the effect of increased Antarctic sea ice formation during glacial periods on the meridional overturning circulation in a number of climate models that are also used for future projections. The proposed mechanism explains more than half of the intermodel spread and discrepancies with the geological record can broadly be reconciled.
June 13, 2017
Jacob Bean, an associate professor in astronomy, and associate professor Dorian Abbot have published a paper arguing that the best scientific returns will come from statistical tests of Earth-like extrasolar planets. Many people have focused on how we may be able to tell whether a specific extrasolar planet is inhabited by life, but it is likely that we won't be able to prove this in a way that will convince everyone for a very long time. Instead we may make more progress by using new telescopes to determine statistically whether scientific theories related to planetary habitability work by on studying large numbers of Earth-like planets.
June 09, 2017
William Rainey Harper Professor Susan Kidwell have published a paper in which they study the local extinction of brachiopods and scallops off the coast of San Diego and Santa Barbara. They used paleontological methods to date fossil shells and determined that this local extinction happened during the 1800's and was likely due to the introduction of cattle, horses, and sheep by the Spanish in the late 1700's. These animals would have made the seawater dirty due to increased runoff and manure, so that the brachiopods and scallops couldn't survive. The work demonstrates both the significant impact pre-industrial societies can have on their environment and the usefulness of paleontological approaches to recent ecological transitions. Congratulations Adam and Susan!