Corredor, J. E. University of Puerto Rico, quimocea@caribe.net
Morell, J. E. University of Puerto Rico, oceano@coqui.net

 
SEASONAL VARIATION OF PHYSICAL AND BIOGEOCHEMICAL FEATURES OF EASTERN CARIBBEAN SURFACE WATER AT THE CARIBBEAN TIME-SERIES STATION (CaTS)
 
Both the Orinoco and Amazon Rivers exert widely different basin-scale effects on surface waters of the eastern Caribbean. We describe vertical and temporal variation of water mass structure, nutrient distribution and phytoplankton biomass south of the island of Puerto Rico with particular emphasis on variability of Caribbean Surface Water (CSW) features. A conservative dilution-dependent model for the discrimination of riverine influence based on salinity-silicate signatures of the Orinoco and Amazon Rivers and a Subtropical North Atlantic oceanic end member, is developed. CSW in the NE Caribbean exhibits year-long continental riverine influence as evidenced by surface salinity consistently below that of Tropical Atlantic Surface Water and elevated silicate content. Long residence time of Amazon River waters in the NW Atlantic cause greater dilution with oceanic water and allows for depletion of its initial load of dissolved organic matter resulting in decreased impact on CSW features. The Orinoco River exerts profound but variable effects on surface features over the second half of the year arriving in the NE Caribbean with a high load of dissolved organic matter and eliciting substantial changes in phytoplankton biomass.
 
Day: Friday, Feb. 5
Time: 02:00 - 02:15pm
Location: Eldorado Hotel
 
Code: SS48FR0215E