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Coastal sea change
Date:12/4/2013

Carbon dioxide pumped into the air since the Industrial Revolution appears to have changed the way the coastal ocean functions, according to a new analysis published this week in Nature.

A comprehensive review of research on carbon cycling in rivers, estuaries and continental shelves suggests that collectively this coastal zone now takes in more carbon dioxide than it releases. The shift could impact global models of carbon's flow through the environment and future predictions related to climate change.

"We need to better understand the role of the coastal ocean in carbon dioxide exchange between the atmosphere and the ocean," said study co-author Wei-Jun Cai, professor of oceanography in the University of Delaware's School of Marine Science and Policy within the College of Earth, Ocean, and Environment. "That will give us a much better capacity to predict future global carbon budgets and fluxes due to climate change and other anthropogenic factors."

Cai and other environmental scientists have been examining the complex dynamics that move different forms of carbon through coastal waters. Numerous variables, from rainfall to temperature to plant photosynthesis, can influence how much carbon is present in water at any given time.

"Carbon is not stationary," Cai said. "It flows and changes among its different forms."

The multiple sources and processes at play make coastal carbon challenging to study, however, and Cai said it has traditionally been overlooked in global carbon budget calculations. The annual estimate of how much anthropogenically-released carbon dioxide is trapped by land, for example, has been determined by subtracting the amount taken up by the ocean from the amount put into the air.

"If there is another reservoir the coastal ocean that also takes up carbon dioxide, then that changes the balance," Cai said.

The coastal zone may be relatively small compared to the open oc
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Contact: Andrea Boyle Tippett
aboyle@udel.edu
302-831-1421
University of Delaware
Source:Eurekalert  

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