This dataset includes geochemical and associated physical data (depth, water temperature, salinity, density) collected using pump casts at fixed locations in the Lower Columbia River estuary from May 5, 1995 to March 6, 1998 (not inclusive) as part of the Columbia River Turbidity Maximum/Land Margin Ecosystem Research (CRETM/LMER) project. Data were submitted by Dr. Frederick Prahl, Oregon State Univ., College of Ocean and Atmospheric Sciences, Corvallis, OR.

This collection includes station and environmental datasets from pump casts and associated CTD casts collected for the Columbia River LMER and Columbia River Turbidity Maximum (CRETM) projects. Pump cast sampling, and associated CTD casts took place from a fixed vessel during one 28-35 day cruise per year in 1990, 1991, 1992, 1995, and 1996. During 1997 and early 1998, there were 2 week "seasonal" cruises in May, July, and October (1997) and February to March (1998). During 1999, sampling was conducted for two weeks in June on the Columbia River and for two weeks in July on the Fraser River in British Columbia, Canada.

Chemical, phytoplankton, and other data were collected from the Columbia River estuary from 16 June 1999 to 29 June 1999. Data were collected from R/V Robert Gordon Sproul, R/V Clifford Barnes, and fixed platforms as part of the Land-Margin Ecosystem Research (LMER) and the Columbia River Estuarine Turbidity Maximum Research Program (CRETMRP). Data were collected by pump casts and include water depths, temperatures, salinities, percent transmissivities, beam attenuations, and rates of primary production per hour. Data also include concentrations of chlorophyll a, phaeopigments, particulate organic carbon, particulate nitrogen, and particulate organic nitrogen.

This dataset includes the 1990, 1991 and 1992 Phytoplankton and Geochemical data from the Columbia River Turbidity Maximum (CRETM) / Land Margin Ecosystem Research Program (LMER). There are 2 metadata files, 3 station data files, 3 phytoplankton data files, and 3 geochemical data files, which were extracted from Station data files. The metadata files explain the parameters found within the phytoplankton and geochemical data sets.

Zooplankton densities, zooplankton species identities, chlorophyll, transmissivity, and temperature data were collected from the ROBERT GORDON SPROUL, WECOMA, and CLIFFORD A. BARNES from May 5, 1997 to March 4, 1998. These data were submitted by the University of Washington as part of the Columbia River Estuarine Turbidity Maximum (CRETM) project. Data were collected using CTD and pump casts in the Columbia River estuary - Washington/Oregon.

These CTD data were obtained during the NSF-sponsored RISE project during July 2004, June 2005, and May-June 2006, on the continental shelf off Oregon and Washington, USA, in the Northeast Pacific Ocean. The data were collected by towing a CTD attached to the towed Triaxus platform. The Triaxus was normally set to undulate between the ocean surface and a depth of 40 to 60m. Transects were obtained, ranging in length from a few km to over 60km.

This dataset contains water temperature, conductivity, pressure, and other parameters taken by CTD (CastAway. These data are used to sample sound velocity in order to correct bathymetry (water depth) along the Columbia River. Data is in netcdf format.

This dataset contains water temperature, conductivity, pressure, and other parameters taken by CTD (CastAway). These data are used to sample sound velocity in order to correct bathymetry (water depth) along the Columbia River. Data are in NetCDF format.

This dataset contains water temperature, conductivity, pressure, and other parameters taken by CTD (CastAway). These data are used to sample sound velocity in order to correct bathymetry (water depth) along the Columbia River. Data are in NetCDF format.

In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA) project of the National Water-Quality Program. One of the major goals of the NAWQA project is to determine how water-quality conditions change over time. To support that goal, long-term consistent and comparable monitoring has been conducted on streams and rivers throughout the Nation. Outside of the NAWQA project, the USGS and other Federal, State, and local agencies also have collected long-term water-quality data to support their own assessments of changing water-quality conditions. Data from these multiple sources have been combined to support one of the most comprehensive assessment conducted to date of water-quality trends in the United States. Ultimately, these data will provide insight into how natural features and human activities have contributed to water-quality changes over time in Nation’s streams and rivers. This USGS data release contains all of the input and output files necessary to reproduce the results from the Weighted Regressions on Time, Discharge, and Season (WRTDS) models described in the associated U.S. Geological Survey Scientific Investigations Report. Data preparation for input to the models is also fully described in the above-mentioned report.