A5041929553- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Wastewater Treatment and Nitrogen Removal
- Aquatic Ecosystems and Phytoplankton Dynamics
- Coral and Marine Ecosystems Studies
- Protist diversity and phylogeny
- Metabolomics and Mass Spectrometry Studies
- Geochemistry and Elemental Analysis
- Diatoms and Algae Research
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Mass Spectrometry Techniques and Applications
- Fish biology, ecology, and behavior
- Groundwater and Isotope Geochemistry
- Genomics and Phylogenetic Studies
- Advanced Proteomics Techniques and Applications
- Geological formations and processes
University of Washington
2015-2025
Seattle University
1994-2021
Irvine University
2010
University of Delaware
1989-2005
College of Marin
1989-2005
Maine Medical Center
1998
University of Maine
1998
University of Georgia
1998
University of Virginia
1998
Paul Scherrer Institute
1994
The purpose of this review is to highlight progress in unraveling carbon cycling dynamics across the continuum landscapes, inland waters, coastal oceans, and atmosphere. Earth systems are intimately interconnected, yet most biogeochemical studies focus on specific components isolation. movement water drives cycle, and, as such, waters provide a critical intersection between terrestrial marine biospheres. Inland, estuarine, well studied regions near centers human population Northern...
Biologically available nitrogen limits photosynthesis in much of the world ocean. Organic matter (OM) stoichiometry had been thought to control balance between two major removal pathways-denitrification and anammox-but expected proportion 30% anammox derived from mean oceanic OM is rarely observed environment. With incubations designed directly test effects stoichiometry, however, we showed that ratio denitrification depends on supply, as predicted. Furthermore, rates loss increase with...
Controlling Factors on Source Rock Development-A Review Of Productivity, Preservation, and Sedimentation Rate
The Branched and Isoprenoid Tetraether (BIT) index (a ratio of marine terrestrial glycerol dialkyl tetraether [GDGT] membrane lipids) was recently introduced as a proxy for the fraction fluvially derived organic carbon (OC) buried in sediments. We investigate source distribution OC sediments large spatial data set that encompasses Washington‐Vancouver Island Margin, Vancouver fjords, Puget Sound with goal comparing BIT to other traditional measures (δ 13 C [δ org ] lignin phenols). δ values...
Abstract Here we present direct measurements of the biological breakdown 13 C‐labeled substrates to CO 2 at seven locations along lower Amazon River, from Óbidos mouth. Dark incubation experiments were performed high and low water periods using vanillin, a lignin phenol derived vascular plants, period four different plant litter leachates. Leachates oak wood degraded most slowly with vanillin monomers, macrophyte leaves, stems, whole grass leachates being converted 1.2, 1.3, 1.7, 2.3 times...
Where they can't breathe Climate warming is causing the expansion of marine oxygen-deficient zones, which are regions in dissolved oxygen concentrations so low that many animals cannot survive. This phenomenon also might affect global cycles carbon, sulfur, nitrogen, and trace metals oceans. Raven et al. show how ocean anoxia affects microbial sulfur processing sinking particles. They observed cryptic sulfate reduction, forms organic resistant to acid hydrolysis, a process could enhance...
Abstract. Human activities are drastically altering water and material flows in river systems across Asia. These anthropogenic perturbations have rarely been linked to the carbon (C) fluxes of Asian rivers that may account for up 40–50 % global fluxes. This review aims provide a conceptual framework assessing human impacts on C fluxes, along with an update alterations riverine Drawing case studies conducted three selected (the Ganges, Mekong, Yellow River) other major rivers, focuses...
The chemical form and bacterial utilization of dissolved combined amino acids (DCAA) were studied in the Delaware estuary coastal waters. Concentrations DCAA estimated after vapor-phase hydrolysis 1.1–2.5-fold higher than those liquid-phase hydrolysis; concentrations ranged from 40 to 1,490 µg liter−1. Protein by bicinchoninic acid method within 13% measured hydrolysis, suggesting that recovers primarily protein. Vapor-phase apparently protein an unknown component because only 30–80% DCAA....
Total nitrogen (TN) loadings in riverine sediments and their coastal depocenters were compared for 11 river systems worldwide to assess the potential impact of particulates on budgets. Strong relationships between sediment specific surface area TN allow these impacts be estimated without intense sampling normally required achieve such About half showed higher than those from depocenter. In spite uncertainties, comparisons indicate that large, turbid rivers, as Amazon, Huanghe, Mississippi,...