Paleoclimate researchers find connection between carbon cycles, climate trends

The Ordovician geologic period included a climate characterized by high atmospheric carbon dioxide (CO₂) levels, warm average temperatures and flourishing life. Near the end of the period, CO₂ levels dropped significantly but precisely when and how fast is poorly known. Kenneth MacLeod, a professor in the Department of Geological Sciences in the MU College of Arts and Science, directed a research team studying the climate changes 450 million years ago to better understand the interactions among the biosphere, the oceans, atmospheric CO₂ levels, and temperature.

"Climate is not a simple science; many small factors determine what exactly leads to global warming and cooling trends," MacLeod said. "By understanding the deep past, we have better information about historic trends that lead to better predictions. Understanding carbon cycles adds value to our knowledge base of climate change."

During the Late Ordovician period, most of North America was covered in a shallow tropical sea. What is now Alabama was on the margin of that sea where local environmental effects likely did significantly impact carbon cycling. Page Quinton, a doctoral student in MU's geological sciences program, led a field research team in northeastern Alabama that collected rock samples from rock formations exposed when workers cut highways through hills in the region. Using the samples, Quinton analyzed them for chemical clues that can be related to CO₂ levels at specific time periods.

"After examining rocks 450 million years old or older, we believe the drop was caused by a massive burial of organic carbon during the time period," Quinton said. "We're trying to determine whether or not there was an increase in plant productivity, or huge algae blooms in the ocean, that died and fell to the sea floor, basically burying CO₂. This burial, coupled with the mountain building event that created the Appalachian Mountains, could have contributed to the resulting ice age."

A drop in CO₂ due to the burial of organic carbon in the Late Ordovician is the exact opposite of what is happening now as massive amounts of CO₂ are being released; yet, understanding how the historic events occurred can help with future models and predictions, Macleod said.