Diagenesis of C, N, and Si in marine sediments from the Western Tropical North Atlantic and Eastern Subtropical North Pacific: pore water models and sedimentary studies ...

• Main Author: Chong, Lauren Stephanie author
• Format: Thesis
• Language: English
• Published: University of Southern California Digital Library (USC.DL) 2013
• Subjects: Geological Sciences degree program; Doctor of Philosophy degree; College of Letters, Arts and Sciences school; Pacific; North Atlantic
• Online Access: https://dx.doi.org/10.25549/usctheses-c3-289974; https://digitallibrary.usc.edu/asset-management/2A3BF1LGQ4MZ

This study addresses C and N cycling in sediments at two locations from two perspectives, based on the sensitivity of the biological pump to the input of nutrients from upwelling and from rivers. The bulk of this dissertation involves research that looks at the impact of the Amazon River on the export of organic matter in the Western Tropical North Atlantic. This work involves extensive spatial coverage of sediment core collection, carbon oxidation rates derived from pore water nitrate models, Si remineralization rates, an analysis of nutrient fluxes, and an assessment of biogenic sedimentation. The secondary part of this dissertation is a study that examines the nitrogen cycle in the upwelling region of the Eastern Tropical North Pacific, looking at how biological nitrate transport affects losses from the biologically available pool of nitrogen, and characterizing the environmental factors that promote this process through thorough study of pore water N species, including N2 and N2O. ...