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Titre du document / Document title

Optics, particles, stratification, and storms on the New England continental shelf : Coastal mixing and optics/primer

Auteur(s) / Author(s)

GARDNER W. D. (1) ; BLAKEY J. C. (1) ; WALSH I. D. (1) ; RICHARDSON M. J. (1) ; PEGAU S. (2) ; ZANEVELD J. R. V. (2) ; ROESLER C. (3) ; GREGG M. C. (4) ; MACKINNON J. A. (4) ; SOSIK H. M. (5) ; WILLIAMS A. J. (5) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Oceanography, Texas A&M University, College Station, Texas, ETATS-UNIS
(2) College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon, ETATS-UNIS
(3) Bigelow Laboratory for Ocean Sciences, West Boothbay Harbor, Maine, ETATS-UNIS
(4) Applied Physics Laboratory and School of Oceanography, University of Washington, Seattle, Washington, ETATS-UNIS
(5) Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, ETATS-UNIS

Résumé / Abstract

In situ beam attenuation and chlorophyll fluorescence were correlated with concentration and bulk composition of particles in shelf waters during summer and spring under different physical forcing conditions to determine if optical parameters could be used as an additional tracer in examining the process of mixing in shelf waters. Time series measurements were made for two 18 day periods during high stratification (late summer 1996, Δσt = ∼3.0 kg m-3 surface to bottom) and low but rapidly developing stratification (spring 1997, Δσt = 0.05 to 0.5 kg m-3) in 70 m of water in a midshelf environment south of Martha's Vineyard, Massachusetts. When defined by hydrography and optical profiles, four layers were identified during the summer: the surface mixed layer, the particle/chlorophyll maximum, the midwater particle minimum, and the bottom nepheloid layer. Fast moving solitons perturbed the water column briefly, but no storms perturbed the system until large surface swells from Hurricane Edouard intensified and thickened the nepheloid layer. Bulk composition and optics of particles in and above the nepheloid layer were distinctly different after the passage of Hurricane Edouard. The hurricane passage demonstrated that intense atmospheric forcing greatly influences both hydrographic and optical properties in the entire water column, even when highly stratified (Δσt = ∼3.0 kg m-3, decreasing to 0.8 kg m-3 post hurricane), and causes massive resuspension, due initially to wave shear stress that was later dominated by current shear. Restratification progressed rapidly after the hurricane passed. During spring the water column started as a weakly stratified two-layer system hydrographically and optically but evolved into three layers as stratification developed. Strong spring storms affected both surface and bottom layers but with decreasing impact as the water column stratified.

Revue / Journal Title

Journal of geophysical research    ISSN  0148-0227 

Source / Source

2001, vol. 106, noC5, pp. 9473-9497 (1 p.3/4)

Langue / Language

Anglais

Editeur / Publisher

American Geophysical Union, Washington, DC, ETATS-UNIS  (1949-2012) (Revue)

Mots-clés anglais / English Keywords

Stratification

;

Storm

;

Continental shelf

;

Attenuation

;

Chlorophyll

;

Fluorescence

;

Concentration

;

Summer

;

Spring(season)

;

Forcing

;

Tracers

;

Mixing process

;

Time series

;

Hydrography

;

Surface layer

;

Mixed layer

;

Soliton

;

Storm water

;

Swell

;

Massachusetts

;

North Atlantic

;

Chemical composition

;

Hurricane

;

Optical properties

;

S wave

;

Shear stress

;

United States

;

North America

;

America

;

Atlantic Ocean

;

Mots-clés français / French Keywords

Stratification

;

Tempête

;

Plateforme continentale

;

Atténuation

;

Chlorophylle

;

Fluorescence

;

Concentration

;

Eté

;

Printemps

;

Forçage

;

Traceur

;

Processus mélangeant

;

Série temporelle

;

Hydrographie

;

Couche superficielle

;

Couche mélangée

;

Soliton

;

Surverse orage

;

Houle

;

Massachusetts

;

Océan Atlantique Nord

;

Composition chimique

;

Ouragan

;

Propriété optique

;

Onde S

;

Contrainte cisaillement

;

Etats Unis

;

Amérique du Nord

;

Amérique

;

Océan Atlantique

;

Mots-clés espagnols / Spanish Keywords

Estratificación

;

Tempestad

;

Plataforma continental

;

Atenuación

;

Clorofila

;

Fluorescencia

;

Concentración

;

Verano

;

Primavera

;

Forzamiento

;

Trazador

;

Proceso mezclante

;

Serie temporal

;

Hidrografía

;

Capa superficial

;

Capa mezclada

;

Solitón

;

Agua lluvia

;

Oleaje

;

Massachusetts

;

Océano Atlántico Norte

;

Composición química

;

Huracán

;

Propiedad óptica

;

Onda S

;

Tensión cizallamiento

;

Estados Unidos

;

America del norte

;

America

;

Océano Atlántico

;

Localisation / Location

INIST-CNRS, Cote INIST : 3144, 35400009826422.0330

Nº notice refdoc (ud4) : 1035339



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