Abstract：
:The Southern Ocean is very important for the potential sequestration of carbon dioxide in the oceans and is expected to be vulnerable to changes in carbon export forced by anthropogenic climate warming. Annual phytoplankton blooms in seasonal ice zones are highly productive and are thought to contribute significantly to pCO2 drawdown in the Southern Ocean. Diatoms are assumed to be the most important phytoplankton class with respect to export production in the Southern Ocean; however, the colonial prymnesiophyte Phaeocystis antarctica regularly forms huge blooms in seasonal ice zones and coastal Antarctic waters. There is little evidence regarding the fate of carbon produced by P. antarctica in the Southern Ocean, although remineralization in the upper water column has been proposed to be the main pathway in polar waters. Here we present evidence for early and rapid carbon export from P. antarctica blooms to deep water and sediments in the Ross Sea. Carbon sequestration from P. antarctica blooms may influence the carbon cycle in the Southern Ocean, especially if projected climatic changes lead to an alteration in the structure of the phytoplankton community.
journal_name
Naturejournal_title
Natureauthors
DiTullio GR,Grebmeier JM,Arrigo KR,Lizotte MP,Robinson DH,Leventer A,Barry JP,VanWoert ML,Dunbar RBdoi
10.1038/35007061keywords:
subject
Has Abstractpub_date
2000-04-06 00:00:00pages
595-8issue
6778eissn
0028-0836issn
1476-4687journal_volume
404pub_type
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