Atmospheric iron fluxes over the last deglaciation: Climatic implications

被引：59

作者：

Gaspari, V ^{[1
]}

Barbante, C

Cozzi, G

Cescon, P

Boutron, CF

Gabrielli, P

Capodaglio, G

Ferrari, C

Petit, JR

Delmonte, B

机构：

[1] Univ Venice, Dept Environm Sci, I-30123 Venice, Italy

[2] Univ Venice, Inst Dynam Environm Proc, CNR, I-30123 Venice, Italy

[3] CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France

[4] Univ Grenoble 1, Unite Format & Rech Phys, Inst Univ France, Grenoble, France

[5] Univ Grenoble 1, Polytech Grenoble, Inst Univ France, Grenoble, France

[6] Univ Milan Bicocca, Dipartimento Sci Ambiente & Terr, I-20126 Milan, Italy

来源：

GEOPHYSICAL RESEARCH LETTERS | 2006年 / 33卷 / 03期

关键词：

D O I：

10.1029/2005GL024352

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A decrease in the micronutrient iron supply to the Southern Ocean is widely believed to be involved in the atmospheric CO2 increase during the last deglaciation. Here we report the first record of atmospheric iron fluxes as determined in 166 samples of the Dome C ice core and covering the last glacial-interglacial transition (22-9 kyr B. P.). It reveals a decrease in fallout flux from 24x10(-2) mg Fe m(-2) yr(-1) during the Last Glacial Maximum to 0.7x10(-2) mg Fe m(-2) yr(-1) at the onset of the Holocene. The acid leachable fraction of iron determined in our samples was the 60% of the total iron mass in glacial samples, about twice the value found for Holocene samples. This emerging difference in iron solubility over different climatic stages provides a new insight for evaluating the iron hypothesis over glacial/interglacial periods.

引用

页数：4

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