Detailed sedimentary N isotope records from Cariaco Basin for terminations I and V

Local and global implications

A. Nele Meckler, Gerald H. Haug, Daniel N. Sigman, Birgit Plessen, Larry C Peterson, Hans R. Thierstein

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

For the last deglaciation and Termination V (the initiation of MIS 11 at around 430 ka) we report high-resolution sedimentary nitrogen isotope (δ15N) records from Cariaco Basin in the Caribbean Sea. During both terminations the previously reported interglacial decrease in δ15N clearly lags local changes such as water column anoxia as well as global increases in denitrification by several thousand years. On top of the glacial-interglacial change, several δ15N peaks were observed during the last deglaciation. The deglacial signal in Cariaco Basin can be best explained as a combination of (1) local variations in suboxia and water column denitrification as the reason for the millennial-scale peaks, (2) a deglacial maximum in mean ocean nitrate δ15N, and (3) increasing N2 fixation in response to globally increased denitrification causing the overall deglacial δ15N decrease. In the Holocene, much of the decrease in δ15N occurred between 6 and 3 ka, coinciding with an expected precession-modulated increase in African dust transport to the tropical North Atlantic and the Caribbean. This begs the hypothesis that N2 fixation in this region increased in response to interglacial maxima in denitrification elsewhere but that this response strengthened with increased mid-Holocene iron input. It remains to be seen whether the data for MIS 11 support this interpretation.

Original languageEnglish (US)
Article numberGB4019
JournalGlobal Biogeochemical Cycles
Volume21
Issue number4
DOIs
StatePublished - Dec 2007

Fingerprint

Denitrification
Isotopes
denitrification
interglacial
isotope
last deglaciation
Management information systems
basin
fixation
Nitrogen Isotopes
water column
Holocene
Nitrogen fixation
Water
anoxia
nitrogen isotope
precession
Nitrates
Dust
Iron

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Environmental Chemistry
  • Global and Planetary Change

Cite this

Detailed sedimentary N isotope records from Cariaco Basin for terminations I and V : Local and global implications. / Meckler, A. Nele; Haug, Gerald H.; Sigman, Daniel N.; Plessen, Birgit; Peterson, Larry C; Thierstein, Hans R.

In: Global Biogeochemical Cycles, Vol. 21, No. 4, GB4019, 12.2007.

Research output: Contribution to journalArticle

Meckler, A. Nele ; Haug, Gerald H. ; Sigman, Daniel N. ; Plessen, Birgit ; Peterson, Larry C ; Thierstein, Hans R. / Detailed sedimentary N isotope records from Cariaco Basin for terminations I and V : Local and global implications. In: Global Biogeochemical Cycles. 2007 ; Vol. 21, No. 4.
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