Accession Number : ADA189748

Title :   Low Molecular Weight Carboxylic Acids in the Sea. Photooxidative Production and Biological Cycling.

Descriptive Note : Final rept. 1 Oct 86-30 Sep 87,

Corporate Author : ROSENSTIEL SCHOOL OF MARINE AND ATMOSPHERIC SCIENCE MIAMI FL DIV OF MARINE AN D ATMOSPHERIC SCIENCE

Personal Author(s) : Mopper, Kenneth

PDF Url : ADA189748

Report Date : 25 Nov 1987

Pagination or Media Count : 5

Abstract : A large fraction of dissolved organic matter (DOM) in seawater is composed of biologically refractory substances. The formation and destruction pathways of this organic matter are still unknown. One potentially important removal pathway that has not been quantified is sunlight-induced (photochemical) break down of DOM in the sea surface. Important breakdown products should include biologically utilizable compounds, especially low molecular weight (LMW) carboxylic acids, formate and acetate, and alpha-keto acids glyoxylate and pyruvate. Therefore, we propose to examine organic acid photo-production in seawater as a tool to evaluate the importance of photo-fragmentation of biologically refractory organic matter in the sea. Laboratory studies will be integrated with a sea-going program, SOLARS, to establish a broad data base for the spatial and temporal distribution of organic acids in coastal and oceanic waters. With this data base, and associated biological turnover and photochemical production measurements, it will be possible to determine the importance of photochemical production of these compounds relative to their biological turnover and geochemical cycling in the sea.

Descriptors :   *ORGANIC MATERIALS, *PHOTOCHEMICAL REACTIONS, *CHEMICAL OCEANOGRAPHY, BIOLOGY, CARBOXYLIC ACIDS, COASTAL REGIONS, CYCLES, DATA BASES, DEGRADATION, DISSOLVING, GEOCHEMISTRY, LABORATORY TESTS, LIGHTWEIGHT, MOLECULAR WEIGHT, OCEAN SURFACE, OCEANS, ORGANIC ACIDS, PRODUCTION, SEA WATER, WATER, OCEAN ENVIRONMENTS, MARINE BIOLOGY

Subject Categories : Physical and Dynamic Oceanography
      Biological Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE