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Data on denitrification and ecological characteristics of nontidal floodplains, Chesapeake Bay watershed, USA, 2013-2016 This data set presents attributes of floodplain ecosystem characteristics including floodplain soil denitrification, floodplain soil biogeochemistry, floodplain vegetation, floodplain sedimentation, floodplain and channel morphometry, stream discharge and water quality, floodplain climate, floodplain physiographic region, and catchment land cover. Attributes are associated with 18 floodplains of the Chesapeake Bay watershed. For many of these attributes, mean values are summaries of multiple measurements made within each floodplain site. Categories: Data; Tags: Maryland, Pennsylvania, USGS Science Data Catalog (SDC), Virginia, West Virginia, All tags... air temperature, alluvial soil, biogeochemistry, climate, denitrification, floodplains, land cover, nitrogen, riparian soil, rivers, season, sediment deposition, soil, streams, Fewer tags Data for Biogeochemical and Physical Processes Controlling Mercury Methylation and Bioaccumulation in Lake Powell, Glen Canyon National Recreation Area, Utah and Arizona, 2014-2015 This dataset includes the field measurements and laboratory analyses of surface water, seston, and sediment collected from Lake Powell, within Glen Canyon National Recreation area (GLCA), during high flow (May-June 2014) and low flow (August 2015) conditions. The study area includes 12-13 sampling sites that follow a transect spanning the entire length of the reservoir from the Colorado River inflow to the Glen Canyon dam, as well as the San Juan River arm, the Escalante River arm and West Canyon. Bed sediment samples were analyzed for mercury speciation, methylmercury production and degradation rates, total reduced sulfur, iron speciation, organic content, and 16S rRNA gene templates as a proxy for microbial abundances.... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Environmental Health, Geochemistry, Lake Powell, Glen Canyon National Recreation Area, Utah and Arizona, USGS Science Data Catalog (SDC), Water Resources, All tags... aquatic ecosystems, bioaccumulation, biogeochemistry, limnology, mercury, reservoir, Fewer tags Mercury speciation and other constituent data for surface sediment and water associated with the South San Francisco Bay Salt Pond Restoration, 2010-18 This dataset includes mercury and other constituent concentration and physical properties data for surface sediment, pore water and surface water collected as part of the South San Francisco Bay Salt Pond Restoration Phase 1 (2010 to 2018) studies. The overarching focus of these studies was to monitor mercury (Hg) biogeochemistry in both sediment and water in response to management actions associated with the conversion of former salt producing ponds to contemporary wetland habitat. The two primary management actions included the breaching of Pond A6 during December 2010, and the construction and operation of an adjustable tidal control structure (TCS) associated with the Pond A5/A7/A8 Complex beginning in June... Categories: Data; Tags: Alviso Slough, Alviso, CA, Environmental Health, Geochemistry, Mountain View, CA, All tags... Santa Clara County, USGS Science Data Catalog (SDC), Water Quality, aquatic ecosystems, bioaccumulation, biogeochemistry, ecosystem management, mercury, methylmercury, wetlands, Fewer tags Shallow Sediment Geochemical Data for the Cache Creek Settling Basin, Yolo County, California, 2010–17 This dataset includes shallow surface sediment (top 0–2 cm interval) constituent concentration data (primarily) and microbial methylmercury production potential rate data (limited) collected from the Cache Creek Settling Basin (CCSB), Yolo County, California, between April 2010 and July 2017. The dataset includes up to 706 observations (including field replicates) per sediment parameter, reflecting 93 unique sampling locations, with each location having been sampled from 1 to 28 times (excluding field replicates) over this 8-year period. There were four spatially intensive field campaigns conducted (February–March 2013, May 2013, October–November 2014, and January–March 2015), during which at least 90 sites were... Categories: Data; Tags: Cache Creek Settling Basin, Sacramento River Watershed, Sacramento–San Joaquin River Delta, Total Maximum Daily Load (TMDL), Woodland, CA, All tags... Yolo Bypass, Yolo County, aquatic ecosystems, basins, biogeochemistry, floodplains, mercury, methylmercury, watershed management, wetlands, Fewer tags Mercury speciation and other constituent data from deep sediment cores in Alviso Slough, South San Francisco Bay, California, 2012-16 This dataset includes mercury and other constituent concentration and physical properties data for seven deep sediment profiles (ranging from 79 cm to 214 cm in length) collected from the thalwag of Alviso Slough, a major tributary to South San Francisco Bay (California, USA). Field sampling occurred during May 2012 (4 sites) and January 2016 (3 sites). Each profile was comprised of 1–4 core sub-sections, which were collected from adjacent boreholes with 10–18 cm of vertical overlap. This data product includes two data tables (*.csv): 1) ‘T1_ALSL_DC_Sed_Data.csv’, the deep core analytical results; 2) ‘T2_ALSL_DC_QA_Data.csv’, quality assurance data. The two image files, ‘ALSL_DC_Log_2012.pdf’ and ‘ALSL-DC_Log_2016.pdf’,... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Alviso Slough, San Francisco Bay, South Bay Salt Ponds, USGS Science Data Catalog (SDC), biogeochemistry, All tags... environment, geoscientificInformation, mercury, sediment cores, slough, slough, wetland restoration, Fewer tags USGS Measurements of Dissolved and Suspended Particulate Material Selenium in Lake Koocanusa in the Vicinity of Libby Dam (MT), 2015-2017 (update) IMPORTANT NOTE: Data and supporting information from samples collected during 2015-16 can be can be accessed from this link. The U.S. Geological Survey is studying Lake Koocanusa, a border reservoir between British Columbia in Canada and Montana, in collaboration with the Montana Department of Environmental Quality and the U.S. Environmental Protection Agency (Region 8). This work is part of a multi-agency project to apply an ecosystem-scale selenium modeling methodology (Presser and Luoma, 2010) to the lake to support development of site-specific selenium guidelines for the protection of aquatic life. A conceptual model framework was published in 2017 (Jenni, Naftz, and Presser, 2017) to serve as a coherent and... Categories: Data; Tags: Environmental Health, Lake Koocanusa, Libby Dam, Lincoln County, Montana, USGS Science Data Catalog (SDC), Water Quality, All tags... biogeochemistry, selenium, Fewer tags USGS Measurements of Dissolved and Suspended Particulate Material Selenium in Lake Koocanusa in the Vicinity of Libby Dam (MT), 2015-2016 IMPORTANT NOTE: An updated version that contains data from samples collected during 2017 can be accessed from this link. The U.S. Geological Survey is studying Lake Koocanusa, a border reservoir between British Columbia in Canada and Montana, in collaboration with the Montana Department of Environmental Quality and the U.S. Environmental Protection Agency (Region 8). This work is part of a multi-agency project to apply an ecosystem-scale selenium modeling methodology (Presser and Luoma, 2010) to the lake to support development of a site-specific selenium guideline for the protection of aquatic life. This Data Release makes available measurements taken during the periods of May, 2015 to October, 2015 and April,... Categories: Data; Types: Citation; Tags: Lake Koocanusa, Libby Dam, Lincoln County, Montana, USGS Science Data Catalog (SDC), biogeochemistry, selenium Assessing spatial variability of nutrients and related water quality constituents in the California Sacramento-San Joaquin Delta: 2015-2022 High resolution mapping surveys in the North Delta-Suisun Habitat Arc This data release documents the spatial and temporal variability of nutrients and related water quality parameters at high spatial resolution in the Sacramento-San Joaquin River Delta of California, USA. The data set includes nitrate, ammonium, phosphate, dissolved organic carbon, temperature, conductivity, dissolved oxygen, turbidity, and chlorophyll. Data-collection were conducted over fourteen days between April 2015 - October 2022 with support from multiple cooperators. NOTE: Files marked as preliminary are provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided... Categories: Data, Data Release - In Progress; Tags: Cache Slough, California, Central Valley, Lower Sacramento, Sacramento River, All tags... Sacramento-San Joaquin Delta, San Francisco Bay, United States, Yolo Bypass, biogeochemistry, biota, delta, discrete sampling, drinking water use, environment, high-resolution, hydrogeology, inlandWaters, nutrient content (water), nutrients, phytoplankton, public supply water use, real-time, statistical analysis, visualization methods, water quality, Fewer tags Shallow Sediment Geochemical Data for the Cache Creek Settling Basin, Yolo County, California This dataset includes shallow surface sediment (top 0–2 cm interval) constituent concentration data (primarily) and microbial methylmercury production potential rate data (limited) collected from the Cache Creek Settling Basin (CCSB), Yolo County, California, between April 2010 and November 2019. The dataset includes up to 723 observations (including field replicates) per sediment parameter, reflecting 93 unique sampling locations, with each location having been sampled from 1 to 29 times (excluding field replicates) over this 10-year period. There were four spatially intensive field campaigns conducted (February–March 2013, May 2013, October–November 2014, and January–March 2015), during which at least 90 sites... Categories: Data; Tags: Cache Creek Settling Basin, Sacramento River Watershed, Sacramento–San Joaquin River Delta, Total Maximum Daily Load (TMDL), Woodland, CA, All tags... Yolo Bypass, Yolo County, aquatic ecosystems, basins, biogeochemistry, floodplains, mercury, methylmercury, watershed management, wetlands, Fewer tags