<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Moore, J. K.</style></author><author><style face="normal" font="default" size="100%">Doney, S. C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Iron availability limits the ocean nitrogen inventory stabilizing feedbacks between marine denitrification and nitrogen fixation</style></title><secondary-title><style face="normal" font="default" size="100%">Global Biogeochemical Cycles</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Glob. Biogeochem. Cycle</style></alt-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">atmospheric co2</style></keyword><keyword><style  face="normal" font="default" size="100%">carbon-dioxide</style></keyword><keyword><style  face="normal" font="default" size="100%">central arabian sea</style></keyword><keyword><style  face="normal" font="default" size="100%">cyanobacterium trichodesmium</style></keyword><keyword><style  face="normal" font="default" size="100%">diazotroph</style></keyword><keyword><style  face="normal" font="default" size="100%">fixed nitrogen</style></keyword><keyword><style  face="normal" font="default" size="100%">n-2 fixation</style></keyword><keyword><style  face="normal" font="default" size="100%">north-atlantic ocean</style></keyword><keyword><style  face="normal" font="default" size="100%">phosphorus</style></keyword><keyword><style  face="normal" font="default" size="100%">trichodesmium</style></keyword><keyword><style  face="normal" font="default" size="100%">tropical south-pacific</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">04/2007</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">pub/679</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">2</style></number><volume><style face="normal" font="default" size="100%">21</style></volume><isbn><style face="normal" font="default" size="100%">0886-6236</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Recent upward revisions in key sink/source terms for fixed nitrogen (N) in the oceans imply a short residence time and strong negative feedbacks involving denitrification and N fixation to prevent large swings in the ocean N inventory over timescales of a few centuries. We tested the strength of these feedbacks in a global biogeochemical elemental cycling (BEC) ocean model that includes water column denitrification and an explicit N fixing phytoplankton group. In the northern Indian Ocean and over longer timescales in the tropical Atlantic, we find strong stabilizing feedbacks that minimize changes in marine N inventory over timescales of similar to 30 - 200 years. In these regions high atmospheric dust/iron inputs lead to phosphorus limitation of diazotrophs, and thus a tight link between N fixation and surface water N/P ratios. Maintenance of the oxygen minimum zones in these basins depends on N fixation driven export. The stabilizing feedbacks in other regions are significant but weaker owing to iron limitation of the diazotrophs. Thus Fe limitation appears to restrict the ability of N fixation to compensate for changes in denitrification in the current climate, perhaps leading the oceans to lose fixed N. We suggest that iron is the ultimate limiting nutrient leading to nitrogen being the proximate limiting nutrient over wide regions today. Iron stress was at least partially alleviated during more dusty, glacial times, leading to a higher marine N inventory, increased export production, and perhaps widespread phosphorus limitation of the phytoplankton community. The increased efficiency of the biological pump would have contributed to the glacial drawdown in atmospheric CO2.&lt;/p&gt;</style></abstract><work-type><style face="normal" font="default" size="100%">Article</style></work-type><accession-num><style face="normal" font="default" size="100%">ISI:000245579200001</style></accession-num><notes><style face="normal" font="default" size="100%">&lt;p&gt;ISI Document Delivery No.: 155LPTimes Cited: 31Cited Reference Count: 86Cited References:      ALTABET MA, 1995, NATURE, V373, P506     ALTABET MA, 2002, NATURE, V415, P159     AMMERMAN JW, 2003, EOS T AM GEOPHYS UN, V84, P165     BANGE HW, 2000, GLOBAL BIOGEOCHEM CY, V14, P1283     BANGE HW, 2005, PROG OCEANOGR, V65, P145, DOI     10.1016/j.pocean.2005.03.002     BERMANFRANK I, 2001, LIMNOL OCEANOGR, V46, P1249     BOYD PW, 2002, GEOPHYS RES LETT, V29, ARTN 1806     BRANDES JA, 1998, LIMNOL OCEANOGR, V43, P1680     BRANDES JA, 2002, GLOBAL BIOGEOCHEM CY, V16, ARTN 1120     BROECKER WS, 1998, PALEOCEANOGRAPHY, V13, P352     CALVERT SE, 1971, DEEP-SEA RES, V18, P505     CAPONE DG, 1997, SCIENCE, V276, P1221     CAPONE DG, 2005, GLOBAL BIOGEOCHEM CY, V19, ARTN GB2024     CHRISTENSEN JP, 1994, CONT SHELF RES, V14, P547     CODISPOTI LA, 1976, LIMNOL OCEANOGR, V21, P379     CODISPOTI LA, 1980, J MAR RES, V38, P453     CODISPOTI LA, 1985, MAR CHEM, V16, P277     CODISPOTI LA, 1989, PRODUCTIVITY OCEAN P, P377     CODISPOTI LA, 2001, SCI MAR S2, V65, P85     COLLINS WD, 2006, J CLIMATE, V19, P2122     CONKRIGHT ME, 1998, 14 NAT OC DAT CTR     CONKRIGHT ME, 2002, WORLD OCEAN ATLAS 20     DAVIS CS, 2006, SCIENCE, V312, P1517, DOI 10.1126/science.1123570     DEUTSCH C, 2001, GLOBAL BIOGEOCHEM CY, V15, P483     DEUTSCH C, 2004, GLOBAL BIOGEOCHEM CY, V18, ARTN GB4012     DEUTSCH C, 2007, NATURE, V445, DOI 10.1038/NATURE05392     DONEY SC, 2003, OCEAN BIOGEOCHEMISTR, P217     DONEY SC, 2004, GLOBAL BIOGEOCHEM CY, V18, ARTN GB3017     DONEY SC, 2006, J CLIMATE, V19, P3033     DUGDALE RC, 1998, NATURE, V391, P270     DYHRMAN ST, 2002, LIMNOL OCEANOGR, V47, P1832     DYHRMAN ST, 2006, NATURE, V439, P68, DOI 10.1038/nature04203     FALKOWSKI PG, 1997, NATURE, V387, P272     FUNG IY, 2000, GLOBAL BIOGEOCHEM CY, V14, P281     GALLOWAY JN, 2004, BIOGEOCHEMISTRY, V70, P153     GANESHRAM RS, 1995, NATURE, V376, P755     GANESHRAM RS, 2002, NATURE, V415, P156     GNANADESIKAN A, 2002, DEEP-SEA RES PT II, V49, P363     GRUBER N, 1997, GLOBAL BIOGEOCHEM CY, V11, P235     GRUBER N, 2004, OCEAN CARBON CYCLE C, P97     HANSELL DA, 2004, MAR CHEM, V84, P243, DOI 10.1016/j.marchem.2003.08.004     HOLL CM, 2005, J PHYCOL, V41, P1178, DOI     10.1111/j.1529-8817.2005.00146.x     HOWELL EA, 1997, GEOPHYS RES LETT, V24, P2549     KARL D, 2002, BIOGEOCHEMISTRY, V57, P47     KEY RM, 2004, GLOBAL BIOGEOCHEM CY, V18, ARTN GB4031     KUSTKA A, 2003, J PHYCOL, V39, P12     KUSTKA AB, 2003, LIMNOL OCEANOGR, V48, P1869     LARGE WG, 2004, NCARTN460PLUSSTR     LEE K, 2002, GEOPHYS RES LETT, V29, ARTN 1907     LENTON TM, 2000, GLOBAL BIOGEOCHEM CY, V14, P225     LUO C, 2003, J GEOPHYS RES-ATMOS, V108, ARTN 4447     MAHAFFEY C, 2005, AM J SCI, V305, P546     MAHOWALD NM, 2006, J GEOPHYS RES-ATMOS, V111, ARTN D10202     MARTIN JH, 1991, LIMNOL OCEANOGR, V36, P1793     MCELROY MB, 1983, NATURE, V302, P328     MEISSNER KJ, 2005, PALEOCEANOGRAPHY, V20, ARTN PA3001     MICHAELS AF, 1996, BIOGEOCHEMISTRY, V35, P181     MICHAELS AF, 2001, OCEANOGRAPHY, V14, P68     MIDDELBURG JJ, 1996, GLOBAL BIOGEOCHEM CY, V10, P661     MILLS MM, 2004, NATURE, V429, P292, DOI 10.1038/nature02550     MONTOYA JP, 2004, NATURE, V430, P1027, DOI 10.1038/nature02824     MOORE JK, 2002, DEEP-SEA RES PT II, V49, P403     MOORE JK, 2002, DEEP-SEA RES PT II, V49, P463     MOORE JK, 2004, GLOBAL BIOGEOCHEM CY, V18, ARTN GB4028     MOORE JK, 2006, TELLUS B, V58, P560, DOI     10.1111/j.1600-0889.2006.00209.x     MOORE JK, 2007, GLOBAL BIOGEOCHEM CY, V21, ARTN GB2001     NAQVI SWA, 1987, J MAR RES, V45, P1049     NAQVI SWA, 1993, DEEP-SEA RES PT II, V40, P687     OLSON DB, 1993, DEEP SEA RES 2, V40, P673     PAREKH P, 2006, PALEOCEANOGRAPHY, V21, ARTN PA3001     PERRY MJ, 1981, DEEP-SEA RES, V28, P39     REDFIELD AC, 1958, AM SCI, V46, P204     RYTHER JH, 1971, SCIENCE, V171, P1008     SANUDOWILHELMY SA, 2001, NATURE, V411, P66     SIEGENTHALER U, 2005, TELLUS B, V57, P51     SIGMAN DM, 2005, GLOBAL BIOGEOCHEM CY, V19, ARTN GB4022     SOHM JA, 2007, IN PRESS MAR ECOL PR     SUTHHOF A, 2001, GLOBAL BIOGEOCHEM CY, V15, P637     TYRRELL T, 1999, NATURE, V400, P525     TYRRELL T, 2002, CONT SHELF RES, V22, P2497     VILLAREAL TA, 1992, MARINE PELAGIC CYANO, P163     VITOUSEK PM, 1991, BIOGEOCHEMISTRY, V13, P87     WU JF, 2003, GLOBAL BIOGEOCHEM CY, V17, ARTN 1008     YAMAMOTOKAWAI M, 2006, NATURE, V443, P43, DOI 10.1038/443043a     YEAGER SG, 2004, J CLIMATOL, V17, P2545     ZEHR JP, 2001, NATURE, V412, P635Moore, J. Keith Doney, Scott C.Amer geophysical unionWashington&lt;/p&gt;</style></notes><auth-address><style face="normal" font="default" size="100%">&lt;p&gt;Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA. Woods Hole Oceanog Inst, Dept Marine Chem &amp;amp; Geochem, Woods Hole, MA 02543 USA.Moore, JK, Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA.jkmoore@uci.edu sdoney@whoi.edu&lt;/p&gt;</style></auth-address></record></records></xml>