Publications by authors named "Ryan J Sibert"
Submarine groundwater discharge (SGD) supplies nutrients, carbon, metals, and radionuclide tracers to estuarine and coastal waters. One aspect of SGD that is poorly recognized is its direct effect on dissolved oxygen (DO) demand in receiving waters, denoted here as SGD-OD. Sulfate-mediated oxidation of organic matter in salty coastal aquifers produces numerous reduced byproducts including sulfide, ammonia, dissolved organic carbon and nitrogen, methane, and reduced metals.
View Article and Find Full Text PDFReports of aerobic biogenic methane () have generated new views about sources in nature. We examine this phenomenon in the free-flowing Yellowstone river wherein concentrations were tracked as a function of environmental conditions, phototrophic microorganisms (using chlorophyll , Chl , as proxy), as well as targeted methylated amines known to be associated with this process. was positively correlated with temperature and Chl , although diurnal measurements showed concentrations were greatest during the night and lowest during maximal solar irradiation.
View Article and Find Full Text PDFArticle Synopsis
- The Guaymas Basin, located in the Gulf of California, experiences localized temperature changes due to magma intrusions beneath a thick layer of sediments, leading to methane venting and unique marine life.
- The study focuses on a site called Ringvent, which is an off-axis hydrothermal system showing signs of past hydrothermal activity about 28 km away from the main spreading center.
- Ringvent represents a transitional phase in hydrothermal systems, revealing important characteristics like thermal anomalies and distinctive biogeochemical signatures, providing insights into the evolution of these systems over time.