Scientists estimate sea level rise by studying past carbon dioxide levels

May 2nd, 2011 - 6:19 pm ICT by ANI  

London, May 2 (ANI): A team of scientists have found how an estimate of the sea level rise can be made by looking at atmospheric carbon dioxide levels 3 million years ago.

The 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.

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.

In the paper, BU College of Arts and Sciences Paleoclimatologist Maureen Raymo and colleagues, provide 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 3 million years ago, scientists like Raymo hope to more accurately 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.

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 40 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.

The researchers published their findings in the current edition of Nature Geoscience in a paper titled ‘Departures from eustasy in Pliocene sea-level records’. (ANI)

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