Nitrogen isotopic variations in the Gulf of California since the Last Deglaciation: Response to global climate change

Carol Pride, Robert Thunell, Daniel Sigman, Lloyd Keigwin, Mark Altabet, Eric Tappa

Research output: Contribution to journalArticle

103 Scopus citations

Abstract

High-resolution records of the nitrogen isotopic composition of organic matter (δ15Norg), opal content, and opal accumulation rates from the central Gulf of California reveal large and abrupt variations during deglaciation and gradual Holocene changes coincident with climatic changes recorded in the North Atlantic. Homogenous sediments with relatively low δ15Norg values and low opal content were deposited at the end of the last glacial period, during the Younger-Dryas event, and during the middle to late Holocene. In contrast, laminated sediments deposited in the two deglacial stages are characterized by very high δ15Norg values (>14‰) and opal accumulation rates (29-41 mg cm-2 yr-1). Abrupt shifts in δ15Norg were driven by widespread changes in the extent of suboxic subsurface waters supporting denitrification and were amplified in the central gulf record due to variations in upwelling, vertical mixing, and/or the latitudinal position of the Intertropical Convergence Zone.

Original languageEnglish (US)
Pages (from-to)397-409
Number of pages13
JournalPaleoceanography
Volume14
Issue number3
DOIs
StatePublished - Jun 1999

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Palaeontology

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