Property fields in an effluent plume of the Mississippi River

G. L. Hitchcock, W. J. Wiseman, W. C. Boicourt, Arthur J Mariano, N. Walker, T. A. Nelsen, E. Ryan

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Surface property distributions were mapped in the Mississippi River plume during May and August, 1993 while following surface drifters. Prevailing winds were the primary factor controlling the orientation of the plume. In May, under typical southeasterly winds, the plume turned anticyclonically towards the coast, while in August, under anomalous westerly winds, the plume turned east. Remote imagery of sea surface temperature and suspended sediments confirmed the direction of the plume. Optimally interpolated maps of surface salinity, temperature, chlorophyll a fluorescence, and transmissivity from underway sampling, and periodic nutrient samples, reveal the plume structure. In May concentrations of nitrate, silicate, and phosphate decreased linearly with increasing salinity. Chlorophyll a increased to peak concentrations of 10 μg l-1 in the plume, although higher pigment biomass was observed near the coast. In August nitrate and silicate concentrations decreased conservatively near the mouth of SW Pass, except where pigment biomass was enhanced in a convergent surface front. Surface nutrient concentrations in the plume also decreased with increasing salinity. The observations provide the first Lagrangian view of surface property distributions in the Mississippi River plume, and indicate that significant temporal variability exists in physical and biological properties within a day after waters are discharged from the river delta.

Original languageEnglish
Pages (from-to)109-126
Number of pages18
JournalJournal of Marine Systems
Volume12
Issue number1-4
DOIs
StatePublished - Aug 1 1997

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Mississippi River
effluents
plume
effluent
river
river plume
silicates
salinity
pigment
pigments
nitrates
chlorophyll a
silicate
chlorophyll
coasts
nitrate
biomass
drifter
nutrient
coast

ASJC Scopus subject areas

  • Aquatic Science
  • Oceanography

Cite this

Hitchcock, G. L., Wiseman, W. J., Boicourt, W. C., Mariano, A. J., Walker, N., Nelsen, T. A., & Ryan, E. (1997). Property fields in an effluent plume of the Mississippi River. Journal of Marine Systems, 12(1-4), 109-126. https://doi.org/10.1016/S0924-7963(96)00092-9

Property fields in an effluent plume of the Mississippi River. / Hitchcock, G. L.; Wiseman, W. J.; Boicourt, W. C.; Mariano, Arthur J; Walker, N.; Nelsen, T. A.; Ryan, E.

In: Journal of Marine Systems, Vol. 12, No. 1-4, 01.08.1997, p. 109-126.

Research output: Contribution to journalArticle

Hitchcock, GL, Wiseman, WJ, Boicourt, WC, Mariano, AJ, Walker, N, Nelsen, TA & Ryan, E 1997, 'Property fields in an effluent plume of the Mississippi River', Journal of Marine Systems, vol. 12, no. 1-4, pp. 109-126. https://doi.org/10.1016/S0924-7963(96)00092-9
Hitchcock GL, Wiseman WJ, Boicourt WC, Mariano AJ, Walker N, Nelsen TA et al. Property fields in an effluent plume of the Mississippi River. Journal of Marine Systems. 1997 Aug 1;12(1-4):109-126. https://doi.org/10.1016/S0924-7963(96)00092-9
Hitchcock, G. L. ; Wiseman, W. J. ; Boicourt, W. C. ; Mariano, Arthur J ; Walker, N. ; Nelsen, T. A. ; Ryan, E. / Property fields in an effluent plume of the Mississippi River. In: Journal of Marine Systems. 1997 ; Vol. 12, No. 1-4. pp. 109-126.
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