IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
SPECTRAL ABSORPTION OF COLORED DISSOLVED ORGANIC MATTER
Autor/es:
SILVIA G. DE MARCO, M. ORNELA BELTRAME, RUBÉN H. FREIJE, JORGE E.
Lugar:
Bahia Blanca, Argentina
Reunión:
Congreso; ECSA 44; 2008
Institución organizadora:
IADO- CONICET, ECSA
Resumen:
Timespace distribution of CDOM and SPM spectral absorption was monitored in
waters from Mar Chiquita Coastal Lagoon (Buenos Aires, Argentina). Six (6) sampling
stations were fixed along a salinity gradient. Subsurface water samples were taken and
processed for the determination of CDOM spectral absorption (ACDOM) and of in vivo
spectral absorption of SPM (AMPS) (350 -750 nm) detritus absorption (AD) and
phytoplankton absorption (AP). High absorbance values, sharp absorption inflections
between 260-280 nm spectral range and a similar UV absorption pattern indicated high
concentrations of CDOM in all stations during the whole study period. SPM
concentrations between 5.7 - 347 mgl-1 were detected. High SPM values were registered
within the inner region, and during spring, related to great storms. Water transparency
was very low (Kd values between 2 y 11 m-1). Detritus showed to be the main
component of SPM and represented the major contribution to spectral absorption of
SPM. Phytoplankton component occassionally was the main contributor to spectral light
absorption. From a bio-optical viewpoint, waters from Mar Chiquita costal lagoon may
be clasiffied as case 2 waters, where detritus is the main component of SPM. This
information is of great usefulness for modelling and building algorythms within water
remote sensing context. Results obtained show that CDOM concentrations are high,
and, together with high concentrations of SPM -dominated by detritus- , contribute to
create an shaded optical environment, where PAR and UV-B solar radiation received by
phytoplankton may be strongly decreased.-1 were detected. High SPM values were registered
within the inner region, and during spring, related to great storms. Water transparency
was very low (Kd values between 2 y 11 m-1). Detritus showed to be the main
component of SPM and represented the major contribution to spectral absorption of
SPM. Phytoplankton component occassionally was the main contributor to spectral light
absorption. From a bio-optical viewpoint, waters from Mar Chiquita costal lagoon may
be clasiffied as case 2 waters, where detritus is the main component of SPM. This
information is of great usefulness for modelling and building algorythms within water
remote sensing context. Results obtained show that CDOM concentrations are high,
and, together with high concentrations of SPM -dominated by detritus- , contribute to
create an shaded optical environment, where PAR and UV-B solar radiation received by
phytoplankton may be strongly decreased.-1). Detritus showed to be the main
component of SPM and represented the major contribution to spectral absorption of
SPM. Phytoplankton component occassionally was the main contributor to spectral light
absorption. From a bio-optical viewpoint, waters from Mar Chiquita costal lagoon may
be clasiffied as case 2 waters, where detritus is the main component of SPM. This
information is of great usefulness for modelling and building algorythms within water
remote sensing context. Results obtained show that CDOM concentrations are high,
and, together with high concentrations of SPM -dominated by detritus- , contribute to
create an shaded optical environment, where PAR and UV-B solar radiation received by
phytoplankton may be strongly decreased.