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Titolo:
A model for estimating bulk refractive index from the optical backscattering ratio and the implications for understanding particle composition in case I and case II waters
Autore:
Twardowski, MS; Boss, E; Macdonald, JB; Pegau, WS; Barnard, AH; Zaneveld, JRV;
Indirizzi:
Oregon State Univ, Coll Oceanog & Atmospher Sci, Corvallis, OR 97331 USA Oregon State Univ Corvallis OR USA 97331 her Sci, Corvallis, OR 97331 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C7, volume: 106, anno: 2001,
pagine: 14129 - 14142
SICI:
0148-0227(20010715)106:C7<14129:AMFEBR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIZE DISTRIBUTION; LIGHT-SCATTERING; COASTAL WATERS; COMPLEX INDEX; OCEAN WATERS; SARGASSO SEA; PHYTOPLANKTON; COLOR; MICROORGANISMS; QUANTIFICATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Twardowski, MS WET Labs Inc, Dept Res, POB 468, Sunderstown, RI 02874 USA WET Labs Inc POB 468 Sunderstown RI USA 02874 RI 02874 USA
Citazione:
M.S. Twardowski et al., "A model for estimating bulk refractive index from the optical backscattering ratio and the implications for understanding particle composition in case I and case II waters", J GEO RES-O, 106(C7), 2001, pp. 14129-14142

Abstract

A model based on Mie theory is described that estimates bulk particulate refractive index ii, from in situ optical measurements alone. Bulk refractive index is described in terms of the backscattering ratio and the hyperbolic slope of the particle size distribution (PSD). The PSD slope xi is estimated from the hyperbolic slope of the particulate attenuation spectrum gammaaccording to the relationship gamma approximate to xi - 3, verified with Mie theory, Thus the required in situ measurements are the particulate backscattering coefficient, the total particulate scattering coefficient, and the particulate attenuation coefficient. These parameters can be measured with commercially available instrumentation with rapid sampling rates and real-time data return. Application of the model to data from the Gulf of California yielded results that agreed with expectations, e,g., predicted np was 1.04-1.05 in the chlorophyll maximum and 1.14-1.18 near sediments. Below the chlorophyll maximum in case I type waters, predicted (n) over bar (p) values were between 1.10 and 1.12, suggesting the presence of a significant inorganic mineral component in the background or detrital organic particles with low water content.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 10:31:16