Since the early 2000s, scientists have been puzzled by a gleaming turquoise spot in the middle of the Antarctic Ocean showing up in satellite images. The patch is located just south of the great calcite belt, a region that's rich in calcite, the mineral form of calcium carbonate, and teeming with coccolithophores, tiny marine organisms that grow reflective calcite shells out of the mineral. The patch, itself, however, is far too frigid to house these cocoliths, adding to the mystery. Now, as detailed in a paper published in the journal Global Biogeochemical Cycles, scientists say they've finally nailed down a […]