Long-term variability of surface nutrient concentrations in the North Pacific

S. Yasunaka, T. Ono, Y. Nojiri, F. A. Whitney, C. Wada, A. Murata, S. Nakaoka, S. Hosoda

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We present the spatial distributions and temporal changes of the long-term variability of surface nutrient concentrations in the North Pacific by using nutrient samples collected by volunteer ships and research vessels from 1961 to 2012. Nutrient samples are optimally interpolated onto 1° × 1° monthly grid boxes. When the Pacific Decadal Oscillation is in its positive phase, nutrient concentrations in the western North Pacific are significantly higher than the climatological means, and those in the eastern North Pacific are significantly lower. When the North Pacific Gyre Oscillation is in its positive phase, nutrient concentrations in the subarctic are significantly higher than the climatological means. The trends of phosphate and silicate averaged over the North Pacific are -0.012 ± 0.005 μmol l-1 decade-1 and -0.38 ± 0.13 μmol l-1 decade-1, whereas the nitrate trend is not significant (0.01 ± 0.13 μmol l-1 decade-1).

Original languageEnglish
Pages (from-to)3389-3397
Number of pages9
JournalGeophysical Research Letters
Volume43
Issue number7
DOIs
Publication statusPublished - 2016 Apr 16
Externally publishedYes

Keywords

  • long-term trend
  • nitrate
  • North Pacific Gyre Oscillation (NPGO)
  • Pacific Decadal Oscillation (PDO)
  • phosphate
  • silicate

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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  • Cite this

    Yasunaka, S., Ono, T., Nojiri, Y., Whitney, F. A., Wada, C., Murata, A., Nakaoka, S., & Hosoda, S. (2016). Long-term variability of surface nutrient concentrations in the North Pacific. Geophysical Research Letters, 43(7), 3389-3397. https://doi.org/10.1002/2016GL068097