Lo w Carbon Dioxide Levels in Atmosphere to at low latitudes as was previously believed. Since durin g Glacial Periods Ma y Be Caused by the waters around Antarctica were mostly covered with Antarctic Sea Ice ice during glacial periods, that could have prevented A new study indicates that variations in Antarctic much of the C0 in the surfacing deep waters from sea ice may have played a significant role in lowering leaking back to the atmosphere, thereby lowering at- atmospheric carbon dioxide (C0 ) during the last ice mospheric C0 concentrations," Stephens said. 2 2 age. This study makes progress toward unraveling the The authors constructed a simple computer model mysteries of past climate changes, a necessary step for that represents the ocean-atmosphere C0 system and predicting future climate. that reflected the improved understanding of deep-wa- ter circulation. The study by Britton Stephens, a University of "When we increased the amount of sea ice around Colorado researcher at the National Oceanic and At- Antarctica in the model to simulate the glacial state, mospheric Administration's (NOAA) Climate Moni- the atmospheric C0 concentration decreased by a toring and Diagnostics Laboratory in Boulder, Colorado (formerly of Scripps), and Ralph Keeling of
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Aug 1, 2000
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