Talbert Marsh is a wetland that has been restored for wildlife and flood control. It is 25 acres and is located at the mouth of the Santa Ana River, California. Porewater equilibrators, �Peepers,� were deployed into the sediments of this wetland to collect samples of sediment porewaters from varying depths. The fluorescence and absorbance of these samples were measured to generate three dimensional excitation-emission matrices (EEMs). Optical properties of the samples varied with sediment depth. Causes of these differences may be due to variations in processing, material types, and amount of materials deposited. Sediment cores taken from the area adjacent to the Peepers were dated. The dating of these sediments was then used to compare the optical properties found at specific depths with the correlated age of the sediment. This correlation was used to examine past seasonal effects, such as El Nino and El Nina, on the production of CDOM.

Association of optical properties of chromophoric dissolved organic matter (CDOM) in soil porewaters with seasonal variations in dated sediment cores

243rd National Meeting (2012)

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