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Titre du document / Document title

Temporal and vertical variability in optical properties of New England shelf waters during late summer and spring : Coastal mixing and optics/primer

Auteur(s) / Author(s)

SOSIK Heidi M. (1) ; GREEN Rebecca E. (1) ; PEGAU W. Scott (2) ; ROESLER Collin S. (3) ;

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

(1) Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, 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

Résumé / Abstract

Relationships between optical and physical properties were examined on the basis of intensive sampling at a site on the New England continental shelf during late summer 1996 and spring 1997. During both seasons, particles were found to be the primary source of temporal and vertical variability in optical properties since light absorption by dissolved material, though significant in magnitude, was relatively constant. Within the particle pool, changes in phytoplankton were responsible for much of the observed optical variability. Physical processes associated with characteristic seasonal patterns in stratification and mixing contributed to optical variability mostly through effects on phytoplankton. An exception to this generalization occurred during summer as the passage of a hurricane led to a breakdown in stratification and substantial resuspension of nonphytoplankton particulate material. Prior to the hurricane, conditions in summer were highly stratified with subsurface maxima in absorption and scattering coefficients. In spring, stratification was much weaker but increased over the sampling period, and a modest phytoplankton bloom caused surface layer maxima in absorption and scattering coefficients. These seasonal differences in the vertical distribution of inherent optical properties were evident in surface reflectance spectra, which were elevated and shifted toward blue wavelengths in the summer. Some seasonal differences in optical properties, including reflectance spectra, suggest that a significant shift toward a smaller particle size distribution occurred in summer. Shorter timescale optical variability was consistent with a variety of influences including episodic events such as the hurricane, physical processes associated with shelfbreak frontal dynamics, biological processes such as phytoplankton growth, and horizontal patchiness combined with water mass advection.

Revue / Journal Title

Journal of geophysical research    ISSN  0148-0227 

Source / Source

2001, vol. 106, noC5, pp. 9455-9472 (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

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

Mots-clés anglais / English Keywords

Time variation

;

Optical properties

;

Summer

;

Spring(season)

;

Physical properties

;

Mixing process

;

Continental shelf

;

Optical absorption

;

Light absorption

;

Phytoplankton

;

Stratification

;

Hurricane

;

Absorptance

;

Diffusion coefficient

;

Surface layer

;

Surface properties

;

Reflectance

;

Optical spectrum

;

Particle size distribution

;

Massachusetts

;

North Atlantic

;

Particle resuspension

;

Water mass

;

United States

;

North America

;

America

;

Atlantic Ocean

;

Mots-clés français / French Keywords

Variation temporelle

;

Propriété optique

;

Eté

;

Printemps

;

Propriété physique

;

Processus mélangeant

;

Plateforme continentale

;

Absorption optique

;

Absorption lumière

;

Phytoplancton

;

Stratification

;

Ouragan

;

Coefficient absorption

;

Coefficient diffusion

;

Couche superficielle

;

Propriété surface

;

Coefficient réflexion

;

Spectre optique

;

Distribution dimension particule

;

Massachusetts

;

Océan Atlantique Nord

;

Resuspension particule

;

Masse eau

;

Etats Unis

;

Amérique du Nord

;

Amérique

;

Océan Atlantique

;

Mots-clés espagnols / Spanish Keywords

Variación temporal

;

Propiedad óptica

;

Verano

;

Primavera

;

Propiedad física

;

Proceso mezclante

;

Plataforma continental

;

Absorción óptica

;

Absorción luz

;

Fitoplancton

;

Estratificación

;

Huracán

;

Coeficiente absorción

;

Coeficiente difusión

;

Capa superficial

;

Propiedad superficie

;

Coeficiente reflexión

;

Espectro óptico

;

Distribución dimensión partícula

;

Massachusetts

;

Océano Atlántico Norte

;

Masa agua

;

Estados Unidos

;

America del norte

;

America

;

Océano Atlántico

;

Localisation / Location

INIST-CNRS, Cote INIST : 3144, 35400009826422.0320

Nº notice refdoc (ud4) : 1035277



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