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<DIV class=journal-title><FONT size=3>Nature</FONT></DIV>
<DIV class=volume><FONT size=2>Volume: </FONT><FONT size=2>487<SPAN>,
</SPAN></FONT><FONT size=2>Pages: </FONT><FONT size=2>313–319</FONT></DIV>
<DIV><FONT size=2>Date published: </FONT><FONT size=2>(19 July
2012)</FONT></DIV>
<DIV><FONT size=2>doi:10.1038/nature11229</FONT></DIV>
<DIV><FONT size=2><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719">http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719</A></FONT></DIV></FONT>
<DIV class=article-heading><FONT size=4></FONT> </DIV>
<DIV class=article-heading><FONT size=4>Deep carbon export from a Southern Ocean
iron-fertilized diatom bloom</FONT></DIV></FONT>
<DIV class="vcard c1" nodeIndex="1"><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-1"><SPAN
class=fn><FONT size=2 face=Arial>Victor Smetacek</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a2"><FONT
size=2 face=Arial>2</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a27"><FONT
size=2 face=Arial>27</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-2"><SPAN
class=fn><FONT size=2 face=Arial>Christine Klaas</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a27"><FONT
size=2 face=Arial>27</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-3"><SPAN
class=fn><FONT size=2 face=Arial>Volker H. Strass</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-4"><SPAN
class=fn><FONT size=2 face=Arial>Philipp Assmy</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a3"><FONT
size=2 face=Arial>3</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-5"><SPAN
class=fn><FONT size=2 face=Arial>Marina Montresor</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a4"><FONT
size=2 face=Arial>4</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-6"><SPAN
class=fn><FONT size=2 face=Arial>Boris Cisewski</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a5"><FONT
size=2 face=Arial>5</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-7"><SPAN
class=fn><FONT size=2 face=Arial>Nicolas Savoye</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a6"><FONT
size=2 face=Arial>6</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a7"><FONT
size=2 face=Arial>7</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-8"><SPAN
class=fn><FONT size=2 face=Arial>Adrian Webb</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a8"><FONT
size=2 face=Arial>8</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-9"><SPAN
class=fn><FONT size=2 face=Arial>Francesco d’Ovidio</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a9"><FONT
size=2 face=Arial>9</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-10"><SPAN
class=fn><FONT size=2 face=Arial>Jesús M. Arrieta</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a10"><FONT
size=2 face=Arial>10</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a11"><FONT
size=2 face=Arial>11</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-11"><SPAN
class=fn><FONT size=2 face=Arial>Ulrich Bathmann</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a12"><FONT
size=2 face=Arial>12</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-12"><SPAN
class=fn><FONT size=2 face=Arial>Richard Bellerby</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a13"><FONT
size=2 face=Arial>13</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a14"><FONT
size=2 face=Arial>14</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-13"><SPAN
class=fn><FONT size=2 face=Arial>Gry Mine Berg</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a15"><FONT
size=2 face=Arial>15</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-14"><SPAN
class=fn><FONT size=2 face=Arial>Peter Croot</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a16"><FONT
size=2 face=Arial>16</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a17"><FONT
size=2 face=Arial>17</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-15"><SPAN
class=fn><FONT size=2 face=Arial>Santiago Gonzalez</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a10"><FONT
size=2 face=Arial>10</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-16"><SPAN
class=fn><FONT size=2 face=Arial>Joachim Henjes</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a18"><FONT
size=2 face=Arial>18</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-17"><SPAN
class=fn><FONT size=2 face=Arial>Gerhard J. Herndl</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a10"><FONT
size=2 face=Arial>10</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a19"><FONT
size=2 face=Arial>19</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-18"><SPAN
class=fn><FONT size=2 face=Arial>Linn J. Hoffmann</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a16"><FONT
size=2 face=Arial>16</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-19"><SPAN
class=fn><FONT size=2 face=Arial>Harry Leach</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a20"><FONT
size=2 face=Arial>20</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-20"><SPAN
class=fn><FONT size=2 face=Arial>Martin Losch</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-21"><SPAN
class=fn><FONT size=2 face=Arial>Matthew M. Mills</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a15"><FONT
size=2 face=Arial>15</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-22"><SPAN
class=fn><FONT size=2 face=Arial>Craig Neill</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a13"><FONT
size=2 face=Arial>13</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a21"><FONT
size=2 face=Arial>21</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-23"><SPAN
class=fn><FONT size=2 face=Arial>Ilka Peeken</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a22"><FONT
size=2 face=Arial>22</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-24"><SPAN
class=fn><FONT size=2 face=Arial>Rüdiger Röttgers</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a23"><FONT
size=2 face=Arial>23</FONT></A><FONT size=2 face=Arial> </FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-25"><SPAN
class=fn><FONT size=2 face=Arial>Oliver Sachs</FONT></SPAN></A><SPAN
style="DISPLAY: none" class=comma jQuery1707132895926809913="15"><FONT size=2
face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a24"><FONT
size=2 face=Arial>24</FONT></A> </DIV>
<DIV style="DISPLAY: none" class=vcard jQuery1707132895926809913="10"
nodeIndex="26"><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-26"><SPAN
class=fn><FONT size=2 face=Arial>Eberhard Sauter</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A> </DIV>
<DIV style="DISPLAY: none" class=vcard jQuery1707132895926809913="11"
nodeIndex="27"><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-27"><SPAN
class=fn><FONT size=2 face=Arial>Maike M. Schmidt</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a25"><FONT
size=2 face=Arial>25</FONT></A> </DIV>
<DIV style="DISPLAY: none" class=vcard jQuery1707132895926809913="12"
nodeIndex="28"><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-28"><SPAN
class=fn><FONT size=2 face=Arial>Jill Schwarz</FONT></SPAN></A><SPAN
class=comma><FONT size=2 face=Arial>,</FONT></SPAN><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A><FONT size=2 face=Arial>, </FONT><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a26"><FONT
size=2 face=Arial>26</FONT></A> </DIV>
<DIV style="DISPLAY: none" class="vcard no-comma" jQuery1707132895926809913="13"
nodeIndex="29"><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-29"><SPAN
class=fn><FONT size=2 face=Arial>Anja Terbrüggen</FONT></SPAN></A><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A> </DIV>
<DIV style="DISPLAY: none" class="vcard last-author no-comma"
jQuery1707132895926809913="14" nodeIndex="30"><FONT size=2 face=Arial>&
</FONT><A class=name
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html?WT.ec_id=NATURE-20120719#auth-30"><SPAN
class=fn><FONT size=2 face=Arial>Dieter Wolf-Gladrow</FONT></SPAN></A><A
href="http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html#a1"><FONT
size=2 face=Arial>1</FONT></A> </DIV><FONT size=2 face=Arial>
<DIV class=authors-toggle><A class=collapsed
href="javascript:;"><I></I></A> </DIV>
<DIV class=first nodeIndex="1"><STRONG>Alfred Wegener Institute for Polar and
Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany</STRONG></DIV>
<DIV class=first nodeIndex="1">Victor Smetacek, Christine Klaas, Volker H.
Strass, Philipp Assmy, Boris Cisewski, Ulrich Bathmann, Joachim Henjes, Martin
Losch, Ilka Peeken, Oliver Sachs, Eberhard Sauter, Jill Schwarz, Anja Terbrüggen
& Dieter Wolf-Gladrow </DIV>
<DIV nodeIndex="14"><STRONG>National Institute of Oceanography, Dona Paula, Goa
403 004, India </STRONG>Victor Smetacek</DIV>
<DIV><STRONG>Norwegian Polar Institute, Fram Centre, Hjalmar Johansens Gate 14,
9296 Tromsø, Norway </STRONG>Philipp Assmy</DIV>
<DIV><STRONG>Ecology and Evolution of Plankton, Stazione Zoologica Anton Dohrn,
Villa Comunale, 80121-Napoli, Italy</STRONG></DIV>
<DIV nodeIndex="1">Marina Montresor</DIV>
<DIV><STRONG>Johann Heinrich von Thünen Institute, Institute of Sea Fisheries,
Palmaille 9, 22767 Hamburg, Germany</STRONG></DIV>
<DIV nodeIndex="1">Boris Cisewski</DIV>
<DIV><STRONG>Department of Analytical and Environmental Chemistry, Vrije
Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium</STRONG></DIV>
<DIV nodeIndex="1">Nicolas Savoye</DIV>
<DIV><STRONG>Univ. Bordeaux/CNRS, EPOC, UMR 5805, Station Marine d’Arcachon, 2
rue du Professeur Jolyet, F-33120 Arcachon, France</STRONG></DIV>
<DIV nodeIndex="1">Nicolas Savoye</DIV>
<DIV><STRONG>Oceanography Department, University of Cape Town, Private Bag X3,
Rondebosch, 7701 Cape Town, South Africa</STRONG></DIV>
<DIV nodeIndex="1">Adrian Webb</DIV>
<DIV><STRONG>LOCEAN-IPSL, CNRS/UPMC/IRD/MNHN, 4 Place Jussieu, 75252 Paris Cedex
5, France </STRONG>Francesco d’Ovidio</DIV>
<DIV><STRONG>Department of Biological Oceanography, Royal Netherlands Institute
for Sea Research, PO Box 59, 1790 AB Den Burg, The Netherlands </STRONG>Jesús M.
Arrieta, Santiago Gonzalez & Gerhard J. Herndl</DIV>
<DIV><STRONG>Department of Global Change Research, Instituto Mediterraneo de
Estudios Avanzados, CSIC-UIB, Miquel Marques 21, 07190 Esporles, Mallorca, Spain
</STRONG>Jesús M. Arrieta</DIV>
<DIV><STRONG>Leibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15,
18119 Rostock, Germany </STRONG>Ulrich Bathmann</DIV>
<DIV><STRONG>Bjerknes Centre for Climate Research, University of Bergen,
Allegaten 55, N-5007 Bergen, Norway</STRONG></DIV>
<DIV nodeIndex="1">Richard Bellerby & Craig Neill</DIV>
<DIV><STRONG>Norwegian Institute for Water Research, Thormøhlensgate 53 D, 5006
Bergen, Norway </STRONG>Richard Bellerby</DIV>
<DIV><STRONG>Department of Environmental Earth System Science, Stanford
University, Stanford, California 94305, USA</STRONG></DIV>
<DIV nodeIndex="1">Gry Mine Berg & Matthew M. Mills</DIV>
<DIV><STRONG>Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20,
24105 Kiel, Germany </STRONG>Peter Croot & Linn J. Hoffmann</DIV>
<DIV><STRONG>Earth and Ocean Sciences, School of Natural Sciences, National
University of Ireland, Galway, Quadrangle Building, University Road, Galway,
Ireland </STRONG>Peter Croot</DIV>
<DIV><STRONG>Phytolutions GmbH, Campus Ring 1, 28759 Bremen, Germany
</STRONG>Joachim Henjes</DIV>
<DIV><STRONG>Department of Marine Biology, University of Vienna, Althanstrasse
14, 1090 Vienna, Austria </STRONG>Gerhard J. Herndl</DIV>
<DIV><STRONG>School of Environmental Sciences, University of Liverpool, Room 209
Nicholson Building, 4 Brownlow Street, Liverpool L69 3GP, UK </STRONG>Harry
Leach</DIV>
<DIV><STRONG>Wealth from Oceans Flagship, Commonwealth Scientific and Industrial
Research Organisation, Castray Esplanade, Hobart, Tasmania 7000, Australia
</STRONG>Craig Neill</DIV>
<DIV><STRONG>MARUM – Center for Marine Environmental Sciences, University of
Bremen, Leobener Strasse, D-28359 Bremen, Germany </STRONG>Ilka
Peeken</DIV>
<DIV><STRONG>Institute for Coastal Research, Helmholtz-Zentrum Geesthacht,
Center for Materials and Coastal Research, Max-Planck-Strasse 1, 21502
Geesthacht, Germany </STRONG>Rüdiger Röttgers</DIV>
<DIV><STRONG>Eberhard & Partner AG, General Guisan Strasse 2, 5000 Arau,
Switzerland </STRONG>Oliver Sachs</DIV>
<DIV><STRONG>Centre for Biomolecular Interactions Bremen, FB 2, University of
Bremen, Postfach 33 04 40, 28359 Bremen, Germany</STRONG></DIV>
<DIV nodeIndex="1">Maike M. Schmidt</DIV>
<DIV><STRONG>School of Marine Science & Engineering, Plymouth University,
Drake Circus, Plymouth PL4 8AA, UK </STRONG>Jill Schwarz</DIV>
<DL class=citation>
<DT><FONT size=3><STRONG>Abstract</STRONG></FONT></DT></DL>
<DIV id=abstract class="section first expanded" sizset="26"
sizcache024886535131066512="1">
<DIV class=stumbleupon sizset="26" sizcache024886535131066512="1"
nodeIndex="10">Fertilization of the ocean by adding iron compounds has induced
diatom-dominated phytoplankton blooms accompanied by considerable carbon dioxide
drawdown in the ocean surface layer. However, because the fate of bloom biomass
could not be adequately resolved in these experiments, the timescales of carbon
sequestration from the atmosphere are uncertain. Here we report the results of a
five-week experiment carried out in the closed core of a vertically coherent,
mesoscale eddy of the Antarctic Circumpolar Current, during which we tracked
sinking particles from the surface to the deep-sea floor. A large diatom bloom
peaked in the fourth week after fertilization. This was followed by mass
mortality of several diatom species that formed rapidly sinking, mucilaginous
aggregates of entangled cells and chains. Taken together, multiple lines of
evidence—although each with important uncertainties—lead us to conclude that at
least half the bloom biomass sank far below a depth of 1,000 metres and that a
substantial portion is likely to have reached the sea floor. Thus,<STRONG>
iron-fertilized diatom blooms may sequester carbon for timescales of centuries
in ocean bottom water and for longer in the
sediments</STRONG>.</DIV></DIV></FONT><BR>
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