Seismologist W. Steven Holbrook and oceanographer Raymond Schmitt might be forgiven for talking past each other aboard a research cruise. Oceanographers normally drop probes overboard, measuring the ocean’s temperature, chemistry and motion. To seismologists, however, the ocean is in the way of their measurements: They typically tune their microphones to detect echoes from below the seafloor in search of clues about Earth’s structure. But over the past five years, Holbrook and Schmitt have learned to listen to each other — and to apply seismic techniques to hear hints of the ocean’s structure.
Three decades ago researchers discovered what are essentially enormous saltwater lakes in the Atlantic Ocean. These “lakes,” called meddies, are gently spinning lenses of water up to 100 kilometers across and one kilometer thick. They float a few hundred meters below the surface of the ocean. Such large, warm bodies, which turned out to come from the Mediterranean Sea, should have an impact on heat exchange in the ocean—and on the planet’s climate. But efforts to study meddies—conventionally by dropping probes that directly measure the ocean’s temperature, salinity and velocity—have proved too costly, infrequent and spread out to reveal how the meddies dissipate their heat. Continue reading Seismic “Noise”–Oil Prospecting Data Could Decipher Ocean Mixing→
Six years ago, would-be lawyer Kira Diaz-Tushman heard a National Public Radio program about the impending retirement of senior U.S. Geological Survey (USGS) geologists. “I thought, ‘That sounds fun. I want to do what they’re doing and play around in the field.’ ” So she double-majored in geology and political science at Bryn Mawr College in Pennsylvania and did a summer internship at USGS.
