Now showing items 1-5 of 5
Inter-annual variability of nutrient distribution in the Eastern Tropical North Pacific oxygen deficient zone
In Oxygen Deficient Zones (ODZs) in the ocean, anaerobic respiratory processes remove fixed nitrogen from the marine system as nitrogen gas. The expansion of ODZs over time in response to accelerated anthropogenic climate change is of concern, so understanding their unique chemistry is critical. The Eastern Tropical North ...
Analysis of Nitrite Concentrations Over Time in the Eastern Tropical North Pacific
The Oxygen Minimum Zone in the Eastern Tropical North Pacific is the largest and most intense in the world. The lack of oxygen causes bacteria to respire anaerobically and therefore changes the nitrogen cycle. Nitrite has previously been measured in this zone 4 times from 1972 to 2012. I collected and compared data from 2016/17 ...
Extracellular enzyme activity of particle-associated and free-living bacteria in the oxygen deficient zone of the Eastern Tropical North Pacific
The downward export of particulate organic matter (POM) in the water column is a globally important mechanism for carbon sequestration in the deep ocean. It is well understood that Oxygen Deficient Zones (ODZs) more efficiently export POM with depth compared to oxic waters. However, the role of microbial hydrolytic activity ...
Determination of respiratory processes in the Oxygen Deficient Zone of the Eastern Tropical North Pacific using targeted proteomics
The majority of the ocean contains sufficient oxygen to support aerobic respiration. However, when oxygen concentrations fall to levels of 10 umol/kg or less, microorganisms utilize alternative electron acceptors such as nitrogen and sulfur during respiration. Regions of the ocean where this occurs are called Oxygen Deficient ...
Drivers of phytoplankton community heterogeneity in the Eastern Tropical North Pacific
We must understand the drivers of primary producer community composition in the open ocean in order to model accurately carbon and nutrient cycling for our planet. I collected samples along a transect in the Eastern Tropical North Pacific, one of the three oxygen deficient zones (ODZ) on the planet. Here, the shoaling of ...