Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum

被引：43

作者：

Conway, T. M. ^{[1
,2
]}

Wolff, E. W. ^{[1
,2
]}

Roethlisberger, R. ^{[2
]}

Mulvaney, R. ^{[2
]}

Elderfield, H. E. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

[2] British Antarctic Survey, Cambridge CB3 0ET, England

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

基金：

英国自然环境研究理事会;

关键词：

ICE-CORE; DOME-C; ATMOSPHERIC CO2; ANTARCTICA ICE; POLAR ICE; DUST; CLIMATE; EPICA; SEA; TRANSITION;

D O I：

10.1038/ncomms8850

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Relief of iron (Fe) limitation in the Southern Ocean during ice ages, with potentially increased carbon storage in the ocean, has been invoked as one driver of glacial-interglacial atmospheric CO2 cycles. Ice and marine sediment records demonstrate that atmospheric dust supply to the oceans increased by up to an order of magnitude during glacial intervals. However, poor constraints on soluble atmospheric Fe fluxes to the oceans limit assessment of the role of Fe in glacial-interglacial change. Here, using novel techniques, we present estimates of water-and seawater-soluble Fe solubility in Last Glacial Maximum (LGM) atmospheric dust from the European Project for Ice Coring in Antarctica (EPICA) Dome C and Berkner Island ice cores. Fe solubility was very variable (1-42%) during the interval, and frequently higher than typically assumed by models. Soluble aerosol Fe fluxes to Dome C at the LGM (0.01-0.84 mg m(-2) per year) suggest that soluble Fe deposition to the Southern Ocean would have been >= 10 x modern deposition, rivalling upwelling supply.

引用

页数：9

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