Photochemcial oxygen consumption in marine waters: A major sink for colored dissolved organic matter?

摘要

Quantification of photochemical O_2 uptake provides a measure of total chemical photooxidation of dissolved organic matter (DOM). Here we study this process and present estimates suggesting that photooxidation has the potential to significantly modify marine DOM pools, complementing or exceeding oxidation via coupled chemical- bioligical pathways. We measured apparent quantum yields (AQYs) of photobleaching, O_2 uptake, and H_2O_2 pro- duction in several coastal marine samples and in dilutions of a tropical estuarine water with oligotrophic seawater.