Dust deposition pulses to the eastern subtropical North Atlantic gyre: Does ocean's biogeochemistry respond?

Susanne Neuer, M. E. Torres-Padrón, M. D. Gelado-Caballero, M. J. Rueda, J. Hernández-Brito, Robert Davenport, Gerold Wefer

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Enhancement of primary and export production following dust deposition pulses is well established for High Nutrient Low Chlorophyll regions, but the effect of atmospheric dust on the biogeochemistry of oligotrophic gyre regions remains unclear. Here we report atmospheric dust concentrations measured on Gran Canaria, Canary Islands, concomitantly with upper water biogeochemistry at the oligotrophic time series station ESTOC (European Station for Time series in the Ocean, Canary Islands) during a 2-year period from winter 1997 to 1999. ESTOC is located in the eastern subtropical Atlantic gyre about 100 km north of Gran Canada and 500 km west of the Sahara, and receives aeolian dust episodically mainly in winter and summer. We found a close correlation of the magnitude of atmospheric dust concentration in winter with the magnitude of downward particle flux at ESTOC, mainly due to a relative increase in lithogenic matter and carbonate sedimentation. Higher aerosol concentration was not accompanied by higher primary or export production, however, indicating that phytoplankton production remained unaffected by atmospheric nitrogen supply on a seasonal or yearly timescale. However, by estimating bioavailable iron input and the need of the phytoplankton population, we found that the highly episodic dust pulses might exert a feast and famine effect on the phytoplankton. Despite the high lithogenic matter input, carbonate, mainly stemming from coccolithophorids, exceeded in importance the role of lithogenic matter as ballasting agent of sinking organic matter.

Original languageEnglish (US)
Pages (from-to)1-10
Number of pages10
JournalGlobal Biogeochemical Cycles
Volume18
Issue number4
DOIs
StatePublished - Dec 2004

Fingerprint

Biogeochemistry
biogeochemistry
gyre
Dust
dust
Phytoplankton
ocean
phytoplankton
Carbonates
winter
Time series
time series
carbonate
famine
eolian deposit
Chlorophyll
Aerosols
Sedimentation
chlorophyll
Biological materials

Keywords

  • Atmospheric dust deposition
  • ESTOC
  • Iron
  • Particle flux
  • Subtropical North Atlantic gyre

ASJC Scopus subject areas

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

Cite this

Neuer, S., Torres-Padrón, M. E., Gelado-Caballero, M. D., Rueda, M. J., Hernández-Brito, J., Davenport, R., & Wefer, G. (2004). Dust deposition pulses to the eastern subtropical North Atlantic gyre: Does ocean's biogeochemistry respond? Global Biogeochemical Cycles, 18(4), 1-10. https://doi.org/10.1029/2004GB002228

Dust deposition pulses to the eastern subtropical North Atlantic gyre : Does ocean's biogeochemistry respond? / Neuer, Susanne; Torres-Padrón, M. E.; Gelado-Caballero, M. D.; Rueda, M. J.; Hernández-Brito, J.; Davenport, Robert; Wefer, Gerold.

In: Global Biogeochemical Cycles, Vol. 18, No. 4, 12.2004, p. 1-10.

Research output: Contribution to journalArticle

Neuer, S, Torres-Padrón, ME, Gelado-Caballero, MD, Rueda, MJ, Hernández-Brito, J, Davenport, R & Wefer, G 2004, 'Dust deposition pulses to the eastern subtropical North Atlantic gyre: Does ocean's biogeochemistry respond?', Global Biogeochemical Cycles, vol. 18, no. 4, pp. 1-10. https://doi.org/10.1029/2004GB002228
Neuer, Susanne ; Torres-Padrón, M. E. ; Gelado-Caballero, M. D. ; Rueda, M. J. ; Hernández-Brito, J. ; Davenport, Robert ; Wefer, Gerold. / Dust deposition pulses to the eastern subtropical North Atlantic gyre : Does ocean's biogeochemistry respond?. In: Global Biogeochemical Cycles. 2004 ; Vol. 18, No. 4. pp. 1-10.
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