000000710 001__ 710
000000710 005__ 20251218131400.0
000000710 0247_ $$2DOI$$a10.6083/M4VQ30NG
000000710 037__ $$aETD
000000710 245__ $$aNutrient loading and transformations in the Columbia River estuary determined by high resolution in situ sensors
000000710 260__ $$bOregon Health and Science University
000000710 269__ $$a2012
000000710 336__ $$aThesis
000000710 502__ $$bM.S.
000000710 520__ $$aWe conducted a high-resolution observational study of nutrient dynamics in the Columbia River estuary using autonomous sensors measuring nitrate + nitrite, ammonium, phosphate, silicic acid, and nitrite across seasons in 2010. Large salinity gradients enabled calculation of river and ocean end members, revealing the estuary’s role as a “bioreactor” for inorganic nutrients despite short residence times. Elevated ammonium and phosphorus during late summer indicate localized remineralization in turbidity zones and lateral bays. Additionally, synchronous pulses of silicic acid and ammonium during spring tides suggest benthic diatom dissolution. These findings underscore estuarine biogeochemical complexity and its influence on nutrient cycling.
000000710 540__ $$fCC BY
000000710 542__ $$fIn copyright - single owner
000000710 650__ $$aNitrogen Cycle$$039194
000000710 650__ $$aPhosphorus$$024059
000000710 650__ $$aEutrophication$$018755
000000710 650__ $$aWater$$027932
000000710 650__ $$aSilicic Acid$$026003
000000710 650__ $$aWater Movements$$027937
000000710 650__ $$aAmmonium Chloride$$014608
000000710 650__ $$aEstuaries$$040221
000000710 651__ $$aUnited States--Columbia River$$044429
000000710 6531_ $$aphosphorus cycle (biogeochemistry)
000000710 6531_ $$ahydrologic cycle
000000710 6531_ $$aphosphorus content
000000710 691__ $$aSchool of Medicine$$041369
000000710 692__ $$aDepartment of Environmental and Biomolecular Systems$$041414
000000710 7001_ $$aGilbert, Melissa$$uOregon Health and Science University$$041354
000000710 7201_ $$aNeedoba, Joseph$$uOregon Health and Science University$$041354$$7Personal$$eAdvisor
000000710 8564_ $$9ac40b052-1c9e-4a56-9172-1e1be07147cb$$s4418891$$uhttps://digitalcollections.ohsu.edu/record/710/files/713_etd.pdf$$ePublic$$2ebd2f9f8fc50b1100b4565ddceb7c236$$31
000000710 905__ $$a/rest/prod/np/19/39/26/np193926w
000000710 909CO $$ooai:digitalcollections.ohsu.edu:710$$pstudent-work
000000710 980__ $$aTheses and Dissertations