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Antarctic icebergs help the ocean take up carbon dioxide
Date:5/11/2011

MOSS LANDING, CA The first comprehensive study of the biological effects of Antarctic icebergs shows that they fertilize the Southern Ocean, enhancing the growth of algae that take up carbon dioxide from the atmosphere and then, through marine food chains, transfer carbon into the deep sea. This process is detailed in 19 new research papers published electronically in a special issue of the journal Deep Sea Research Part II: Topical Studies in Oceanography.

The research team was led by MBARI marine biologist Ken Smith and funded by the National Science Foundation. Smith, along with researchers from more than a dozen other institutions, conducted three month-long cruises to the Weddell Sea in 2005, 2008, and 2009. By tracking individual icebergs and deploying remotely controlled aircraft and submersibles, as well as robotic drifters, the team was able to document a process that had previously been suspected, but never proven.

Global climate change is causing Antarctic ice shelves to shrink and split apart, releasing thousands of free-drifting icebergs that are carried by currents into the nearby Weddell Sea. The new research suggests that these icebergs carry iron-rich sediment from the land out into the ocean. As these icebergs melt and drift across the ocean, some of the iron dissolves in the seawater, creating a trail of iron-rich meltwater that can be up to 19 kilometers (12 miles) long. The iron in this water helps fertilize the growth of microscopic algae.

During their three cruises, the team studied an area they called "iceberg alley" in the inhospitable and sometimes dangerous Southern Ocean. Instead of avoiding icebergs, they directed their research vessel to approach and follow drifting icebergs the size of small towns. To follow individual icebergs, they used satellites and GPS tracking devices that were dropped on the icebergs using a radio-controlled airplane. They also used three different robotic submersibles t
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Contact: Kim Fulton-Bennett
kfb@mbari.org
831-775-1835
Monterey Bay Aquarium Research Institute
Source:Eurekalert  

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