Distribution and composition of biogenic particulate matter in a Gulf Stream warm-core ring

David M. Nelson, Hugh W. Ducklow, Gary L. Hitchcock, Mark A. Brzezinski, Timothy J. Cowles, Christopher Garside, Richard W. Gould, Terrence M. Joyce, Chris Langdon, James J. McCarthy, Charles S. Yentsch

Research output: Contribution to journalArticle

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Abstract

We have characterized the biogenic particle field in Gulf Stream warm-core ring 82-B in June of 1982. Our observations include chlorophyll α and phaeopigments, ATP, particulate organic carbon and nitrogen, biogenic silica, total particle volume and size distribution, bacterial abundance and picoplankton biomass, and the abundances of diatoms, dinoflagellates and coccolithophorids in the upper 700 m along two transects of the ring. A distinct maximum in phytoplankton biomass occurred within the thermocline (20 to 40 m) at the ring's center of rotation. This maximum had not been present in late April, and apparently developed within 3 to 4 weeks after the ring stratified in mid May. It exhibited a high degree of axial symmetry about the center of the ring, with biomass decreasing outward from ring center. A second biomass maximum associated with shelf surface water was being entrained into the anticyclonic flow field of the ring 60 to 70 km from its center. Maximum chlorophyll α and ATP concentrations observed in the two biomass maxima were similar, but the ring-center maximum was 2 to 10 times richer in particulate carbon, biogenic silica, particles > 5 μm in diameter, dinoflagellates, diatoms and estimated organic detritus, while the entrained shelf water had 2 to 5 times greater abundances of unicellular monads. Heterotrophic bacterial abundance and biomass, and the abundance of cocoid cyanobacteria were maximal in the region of highest rotational velocity 40 to 50 km from ring center. In this region the abundances of bacteria and cyanobacteria were 2 to 5 times as great as at the center of the ring. Two possible mechanisms can explain the development of an axially symmetrical maximum in biogenic particulate matter in the center of a warm-core ring: concentration by the flow field and in situ growth. Our data on the distribution and composition of biogenic material in ring 82-B indicate a greater likehood that this particular ring-center maximum developed in situ.

Original languageEnglish
Pages (from-to)1347-1369
Number of pages23
JournalDeep Sea Research Part A, Oceanographic Research Papers
Volume32
Issue number11
DOIs
StatePublished - Jan 1 1985
Externally publishedYes

Fingerprint

particulate matter
biomass
dinoflagellate
flow field
cyanobacterium
chlorophyll
diatom
silica
biogenic material
particulate organic nitrogen
picoplankton
particulate organic carbon
thermocline
detritus
symmetry
gulf
distribution
transect
phytoplankton
surface water

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Nelson, D. M., Ducklow, H. W., Hitchcock, G. L., Brzezinski, M. A., Cowles, T. J., Garside, C., ... Yentsch, C. S. (1985). Distribution and composition of biogenic particulate matter in a Gulf Stream warm-core ring. Deep Sea Research Part A, Oceanographic Research Papers, 32(11), 1347-1369. https://doi.org/10.1016/0198-0149(85)90052-4

Distribution and composition of biogenic particulate matter in a Gulf Stream warm-core ring. / Nelson, David M.; Ducklow, Hugh W.; Hitchcock, Gary L.; Brzezinski, Mark A.; Cowles, Timothy J.; Garside, Christopher; Gould, Richard W.; Joyce, Terrence M.; Langdon, Chris; McCarthy, James J.; Yentsch, Charles S.

In: Deep Sea Research Part A, Oceanographic Research Papers, Vol. 32, No. 11, 01.01.1985, p. 1347-1369.

Research output: Contribution to journalArticle

Nelson, DM, Ducklow, HW, Hitchcock, GL, Brzezinski, MA, Cowles, TJ, Garside, C, Gould, RW, Joyce, TM, Langdon, C, McCarthy, JJ & Yentsch, CS 1985, 'Distribution and composition of biogenic particulate matter in a Gulf Stream warm-core ring', Deep Sea Research Part A, Oceanographic Research Papers, vol. 32, no. 11, pp. 1347-1369. https://doi.org/10.1016/0198-0149(85)90052-4
Nelson, David M. ; Ducklow, Hugh W. ; Hitchcock, Gary L. ; Brzezinski, Mark A. ; Cowles, Timothy J. ; Garside, Christopher ; Gould, Richard W. ; Joyce, Terrence M. ; Langdon, Chris ; McCarthy, James J. ; Yentsch, Charles S. / Distribution and composition of biogenic particulate matter in a Gulf Stream warm-core ring. In: Deep Sea Research Part A, Oceanographic Research Papers. 1985 ; Vol. 32, No. 11. pp. 1347-1369.
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AU - Garside, Christopher

AU - Gould, Richard W.

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