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Scientists have discovered that when Antarctic icebergs cool and dilute the seas through which they pass for days, they also raise the chlorophyll levels in water, thus increasing the carbondioxide absorption in ocean.
An interdisciplinary research team, supported by the National Science Foundation, claims the finding has global implications for climate research, the Nature Geoscience journal reported.
The research indicates that ordinary icebergs are likely to be more prevalent in the Southern Ocean, particularly as the Antarctic Peninsula continues a well-documented warming trend and ice shelves disintegrate.
It also shows that these ordinary icebergs are important features of not only marine ecosystems, but even of global carbon cycling.
“These new findings amplify the team’s previous discoveries about icebergs and confirm that icebergs contribute yet another, previously unsuspected, dimension of physical and biological complexity to polar ecosystems,” said Mr Roberta L. Marinelli, Director of the NSF’s Antarctic Program.
The latest findings document a persistent change in physical and biological characteristics of surface waters after the transit of an iceberg, which has important effects on phytoplankton populations, clearly demonstrating “that icebergs influence oceanic surface waters and mixing to greater extents than previously realised, said Mr Ronald Kaufmann of University of San Diego.
The researchers studied the effects by sampling the area around a large iceberg more than 32 kilometres (20 miles) long; the same area was surveyed again ten days later, after the iceberg had drifted away.
After 10 days, the scientists observed increased concentrations of chlorophyll and reduced concentrations of carbondioxide compared to the nearby areas without icebergs.
These results are consistent with the growth of phytoplankton and the removal of carbondioxide from the ocean.
The new results demonstrate that icebergs provide a connection between the geophysical and biological domains that directly affects the carbon cycle in the Southern Ocean, Mr Marinelli added.
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