IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Environmental Conditions and Bio-optical Signature of a Coccolithophorids Bloom in the Patagonian Shelf
Autor/es:
GARCIA, C.A.E.; GARCIA, V.M.T; DOGLIOTTI, A.I.; FERREIRA, A.; ROMERO, S.I.; MANNINO, A.; SOUZA, M.S.; MATA, M.M.
Revista:
JOURNAL OF GEOPHYSICAL RESEARCH
Editorial:
AMER GEOPHYSICAL UNION
Referencias:
Año: 2011 vol. 116 p. 1 - 11
ISSN:
0148-0227
Resumen:
In January 2008, a patch of high reflectance detected by ocean color satellite imageswas sampled during a cruise over the southern Argentinean continental shelf. High calciteconcentrations (particulate inorganic carbon (PIC)) found at the patch were associatedwith dominance of the coccolithophorid Emiliania huxleyi. Relatively low chlorophyllconcentrations (0.29 to 1.48 mg m−3) were found, but both particulate attenuation (0.27 to1.15 m−1) and backscattering coefficients at 660 nm (0.003 to 0.042 m−1) were noticeablyhigh. Particulate inorganic to organic carbon (POC) ratio (PIC:POC) was highlyvariable (0.02 to 1.1), but mostly high, showing a significant correlation with particulatebackscattering coefficient at 660 nm (r = 0.83, p < 0.005). The spectral dependency ofthe backscattering coefficient followed Gordon et al. (2009). Both the time evolutionanalyses of normalized water leaving radiance at 551 nm (nLw551) and the high PIC:POCratios suggested an advanced stage of the coccolithophorid bloom, therefore with highdetached coccoliths:cell ratios. Moreover, this was supported by a strong correlationbetween PIC and both particulate backscattering (r = 0.81, p < 0.005) and particulate beamattenuation coefficient (r = 0.7, p < 0.05). Remote sensing reflectance data were stronglyrelated to particle backscattering and backscattering ratio, but not to absorption. NASAoperational algorithms overestimated chlorophyll by a factor of "2 and estimated PIC witha relatively high root!mean!square (RMS) error (RMS = 97.9 mg PIC L−1). Betterestimates of PIC values (RMS = 81.5 mg PIC L−1) were achieved when we used theoriginal PIC!specific backscattering coefficient (Balch et al., 2005).