What drives Oregon shelf summer hypoxia?
Andrey O. Koch, Yvette H. Spitz, Harold P. Batchelder

TL;DR
This study uses a coupled biological-physical model to analyze the dynamics and development of hypoxia on the Oregon shelf during summer months across three years, highlighting the influence of boundary conditions and physical processes.
Contribution
It provides new insights into the physical and boundary condition factors influencing hypoxia development, emphasizing the role of coastal upwelling and boundary data sensitivity.
Findings
Hypoxia existed during summer in all three years studied.
Physical processes like advection and diffusion mainly drive hypoxia onset.
Coastal upwelling is the primary physical mechanism causing hypoxia.
Abstract
Using coupled biological-physical model based on NPZD-type biological model and 3D coastal ocean model (ROMS) we studied dissolved oxygen (DO) dynamics and hypoxia development on Oregon shelf during April-August of 2002, 2006, and 2008. We found that shelf hypoxia existed during summer months of all three years. It was characterized by variable severity, horizontal and vertical extent, duration and timing, and it was more pronounced in 2002 and 2006. By the means of numerical sensitivity analysis we found out that: inadequate initial DO and NO3 conditions in late-spring 2002 prevented or delayed hypoxia development; offshore and especially northern DO and NO3 boundary conditions are important to simulating hypoxia on the Oregon shelf, this was especially critical for early bottom hypoxia on the shelf north of 45N in 2006; hypoxia occurred earlier in the north in 2006 and in the south…
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Taxonomy
TopicsMarine and coastal ecosystems · Oceanographic and Atmospheric Processes · Ocean Acidification Effects and Responses
