Photochemical Studies of the Eastern Caribbean: An Introductory Overview
Abstract
This special section of the Journal of Geophysical Research reports a multi-investigator study of a number of sunlight-initiated photoprocesses taking place in the varied biogeochemical and oceanographic environment found in the tropical Eastern Caribbean and Orinoco River delta in the spring and fall of 1988. Principal conceptual themes that were addressed by the program included (1) the characterization of the role of dissolved organic matter as the main chromophore initiating photoprocesses in surface seawater, (2) the determination of the fluxes and pathways of reactants and transient species involved in oxygen photoredox chemistry, and (3) the continuing development of chemical mapping strategies, including observing and modelling reactive phototransient distribution in terms of their sources, mixing, and fates. Ancillary supporting studies included observation of water mass tracers, dissolved trace gases, atmospheric components, nutrients and the geochemistry of estuarine mixing processes in an important continental margin. The observational and mechanistic investigations reported here feature a number of novel or improved methods allied with some advanced underway sampling, sensing and computing facilities that were implemented aboard the R/V Columbus Iselin. Results from the study showed large-scale (approx. 1000 km) seasonal variations in surface water photoreactivity, optical and biooptical characteristic over much of the Caribbean basin. These changes resulted from seasonally varying riverine inputs of organic chromophores, nutrients and suspended material.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 15, 1993
- Accession Number
- ADA267573
Entities
People
- Oliver C. Zafiriou
- Peter J. Milne
- Rod G. Zika
Organizations
- Woods Hole Oceanographic Institution