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A Cool, Nutrient‐Enriched Eastern Equatorial Pacific During the Mid‐Pleistocene Transition
Author(s) -
Robinson Rebecca S.,
Jones Colin A.,
Kelly Roger P.,
Rafter Patrick,
Etourneau Johan,
Martinez Philippe
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl081315
Subject(s) - upwelling , oceanography , geology , thermocline , biogeochemical cycle , biogenic silica , glacial period , new production , interglacial , nutrient , drawdown (hydrology) , pleistocene , climatology , environmental science , paleontology , diatom , phytoplankton , groundwater , chemistry , geotechnical engineering , aquifer , organic chemistry , environmental chemistry
The emergence of high‐amplitude, low‐frequency glacial‐interglacial cycles during the mid‐Pleistocene climate transition (MPT; 800–1,200 ka) is associated with global cooling. In the eastern equatorial Pacific, sea surface temperatures cooled, and the upwelling‐induced cold tongue expanded significantly during the MPT. Here we use sedimentary records of iron, biogenic silica, and nutrient‐nitrogen consumption to evaluate biogeochemical changes hypothesized to accompany the cold tongue expansion. Our results suggest that the eastern equatorial Pacific of the MPT hosted surface waters with higher nitrate contents and biogenic silica production relative to the last 600 ka. Increased production occurred despite low iron supply. We attribute this to enhanced upwelling and nutrient enrichment of thermocline waters, both likely related to the northward migration of Southern Ocean fronts. The return of these fronts to their southward positions after the MPT may be associated with stronger drawdown of nutrients and, potentially, atmospheric CO 2 in the Southern Ocean.