The influence of Antarctic subglacial volcanism on the global iron cycle during the Last Glacial Maximum.

Nat Commun 2017 06 9;8:15425. Epub 2017 Jun 9.

Australian Centre for Ancient DNA (ACAD), The University of Adelaide, Adelaide, South Australia 5005, Australia.

Marine sediment records suggest that episodes of major atmospheric CO drawdown during the last glacial period were linked to iron (Fe) fertilization of subantarctic surface waters. The principal source of this Fe is thought to be dust transported from southern mid-latitude deserts. However, uncertainty exists over contributions to CO sequestration from complementary Fe sources, such as the Antarctic ice sheet, due to the difficulty of locating and interrogating suitable archives that have the potential to preserve such information. Here we present petrographic, geochemical and microbial DNA evidence preserved in precisely dated subglacial calcites from close to the East Antarctic Ice-Sheet margin, which together suggest that volcanically-induced drainage of Fe-rich waters during the Last Glacial Maximum could have reached the Southern Ocean. Our results support a significant contribution of Antarctic volcanism to subglacial transport and delivery of nutrients with implications on ocean productivity at peak glacial conditions.

Download full-text PDF

Source
http://dx.doi.org/10.1038/ncomms15425DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5472753PMC
June 2017
55 Reads

Publication Analysis

Top Keywords

glacial maximum
8
petrographic geochemical
4
geochemical microbial
4
preserve petrographic
4
potential preserve
4
archives potential
4
microbial dna
4
dna evidence
4
dated subglacial
4
subglacial calcites
4
precisely dated
4
preserved precisely
4
evidence preserved
4
suitable archives
4
interrogating suitable
4
exists contributions
4
contributions sequestration
4
uncertainty exists
4
deserts uncertainty
4
mid-latitude deserts
4

References

(Supplied by CrossRef)

SL Jaccard et al.
Nature 2016

A Martínez-García et al.
Science 2014

F Chever et al.
Biogeosciences 2010

R Death et al.
Biogeosciences 2014

A Boetius et al.
Nat. Rev. Microbiol. 2015

HM Dierssen et al.
Proc. Natl Acad. Sci. USA 2002

JR Hawkings et al.
Nat. Commun. 2014

R Raiswell et al.
Biogeosciences 2016

RE Bell et al.
Nature 2007

CF Maule et al.
Science 2005

CI Fraser et al.
Proc. Natl Acad. Sci. USA 2014

Similar Publications