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The distribution and partitioning of dissolved organic matter off the Oregon Coast : a first look

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dc.contributor.advisor Wheeler, Patricia A.
dc.creator Hill, Jon K.
dc.date.accessioned 2012-06-25T15:15:44Z
dc.date.available 2012-06-25T15:15:44Z
dc.date.copyright 1999-05-20
dc.date.issued 1999-05-20
dc.identifier.uri http://hdl.handle.net/1957/30114
dc.description Graduation date: 2000 en_US
dc.description.abstract The purpose of this thesis is to provide a first look at the spatial and temporal distributions of dissolved organic material (DOM) off the Oregon coast of North America. While this paper is not a comprehensive examination of these distributions, several patterns are identified as promising candidates for continued research. Most of the data presented was acquired during a strong El Nino event. The DOM data is presented as dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) and is accompanied by temperature, salinity, nitrate plus nitrite (N+N), ammonium, silicate, chlorophyll, total organic carbon (TOC), particulate organic carbon (POC), total nitrogen (TN), total organic nitrogen (TON), and zooplankton biomass measurements. During July 1997, we examined the distribution of DOM in the surface waters off the Oregon and Southern Washington coasts. Eleven east-west transects were sampled from nearshore waters to 190km offshore. DOC concentrations as high as 180 iM were observed in the Columbia River plume. Patterns in the DOC distribution were also associated with upwelling regions, an offshore coastal jet, and an oligotrophic water mass in the northern portion of our study area. Beginning with the July 1997 study and continuing until July 1998, samples were collected on weekly and seasonal time scales at station NH-05, located 9km offshore from Newport, Oregon. Various problems have limited our seasonal comparisons, but we were able to collect high quality data depicting the changes in organic matter partitioning during a phytoplankton bloom and its decline during a two month period from mid-July through mid-September in 1997. During the bloom, POC increased dramatically, but DOC decreased. Possible explanations for this decrease and for changes in the C/N ratio of the DOM during the bloom are explored. Suggestions for future research are presented in the final chapter. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Carbon cycle (Biogeochemistry) -- Oregon en_US
dc.subject.lcsh Marine ecology -- Oregon en_US
dc.title The distribution and partitioning of dissolved organic matter off the Oregon Coast : a first look en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Science (M.S.) in Oceanography en_US
dc.degree.level Master's en_US
dc.degree.discipline Oceanic and Atmospheric Sciences en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Wright, Dawn
dc.contributor.committeemember Prahl, Fred
dc.contributor.committeemember Brownell, Phillip
dc.description.digitization File scanned at 300 ppi (Monochrome, 24-bit Color) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us

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