Infrastructure protectionWhat past rises of sea levels tell us about future rises
During a period of high atmospheric carbon dioxide levels three million years ago — the mid-Pliocene climate optimum — sea levels were anywhere between 15 and 100 feet higher than at present because water that is now locked up in glaciers as ice circulated freely through the oceans; by understanding the extent of sea level rise three million years ago, scientists hope more accurately to predict just how high the seas will rise in the coming decades and centuries due to global warming
Boston University College of Arts & Sciences Paleoclimatologist Maureen Raymo and colleagues published findings that should help scientists better estimate the level of sea level rise during a period of high atmospheric carbon dioxide levels three million years ago. That geologic era, known as the mid-Pliocene climate optimum, saw much higher global temperatures that may have been caused by elevated levels of carbon dioxide — an analogy for the type of climate we are causing through human addition of greenhouse gases to the atmosphere.
Newswise, citing a Boston University release, reports that During the mid-Pliocene climate optimum, sea levels were anywhere between 15 and 100 feet higher than at present because water that is now locked up in glaciers as ice circulated freely through the oceans. Raymo and her colleagues published their findings in the current edition of Nature Geoscience. The paper provides an improved model for interpreting geologic evidence of ancient shorelines.
The team’s findings add to the scientific body of knowledge about mid-Pliocene sea levels. By understanding the extent of sea level rise three million years ago, scientists like Raymo hope more accurately to predict just how high the seas will rise in the coming decades and centuries due to global warming.
Through their project, titled PLIOMAX (Pliocene maximum sea level project), Raymo and her colleagues have shared data with a larger community of geoscientists involved in studying similar so-called “high stand deposits” around the world. The accumulated data should shed light on the extent to which we can expect the Greenland Ice Sheet, West Antarctic Ice Sheet, and East Antarctic Ice Sheet to melt due to increasing levels of atmospheric carbon dioxide.
The BU release notes that Raymo studies the causes of climate change over Earth’s history, in particular the role played by the global carbon cycle and Earth’s orbital variations around the Sun. Most of her work has been based on data collected from deep-sea sediment and microfossils recovered using the research vessel JOIDES Resolution. She has used the stable isotopes of oxygen and carbon to study past ocean circulation and ice volume history and is well known for her proposal that the cooling of global climate over the last forty million years was caused primarily by enhanced chemical weathering and consumption of atmospheric CO2 in the mountainous regions of the world, especially in the Himalayas.
—Read more in Maureen E. Raymo et al., “Departures from eustasy in Pliocene sea-level records,” Nature Geoscience 4 (17 April 2011): 328–32 (doi:10.1038/ngeo1118)
