This data release contains phytoplankton classification and enumeration results from two moving boat surveys conducted on July 15 - 18, 2019 and August 19 - 22, 2019. These data were collected from the Caloosahatchee River and estuary, the St. Lucie River and estuary, and Lake Okeechobee with funding provided by the USGS Priority Ecosystems Greater Everglades Program.

This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from the Caloosahatchee River and St. Lucie River July 13-15, 2020 and the Caloosahatchee River September 22 and 23 of 2019, south Florida. The St. Lucie portion of the surveys was not able to be completed in September due to boat engine failure. Geo-referenced measurements of near surface water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll fluorescence, phycocyanin fluorescence, and fluorescence of dissolved organic matter were recorded at 20 second intervals and nitrate+nitrite as nitrogen was recorded at 5 to 60 second intervals during water-quality surveys in order to create high resolution water-quality maps of the study area.

This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from the Caloosahatchee River on June 21-22 and July 20, 2021, south Florida. Geo-referenced measurements of near surface water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll fluorescence, phycocyanin fluorescence, and fluorescence of dissolved organic matter were recorded at 20 second intervals and nitrate+nitrite as nitrogen was recorded at 5 to 60 second intervals during water-quality surveys in order to create high resolution water-quality maps of the study area.

Water-quality constituents were measured along planned survey lines, which were generally perpendicular to the shoreline and spaced 100 meters apart, over an approximately 2.3-mile section of nearshore Lake Erie on June 10-12, 2019 (survey 1), and August 19-21, 2019 (survey 2), with a YSI EcoMapper autonomous underwater vehicle (AUV) using an undulating dive pattern (a 15-degree dive angle between the surface and 6 feet above the bottom). Water-quality data collected in this area included three-dimensional measurements of water temperature, specific conductance, pH, dissolved oxygen, chlorophyll, and phycocyanin (blue-green algae). The water-quality data were measured at 1-second intervals and were geo-referenced with the AUV onboard Global Positioning System (GPS WAAS) system. There was a total of 40 survey lines which typically started about 50 meters offshore and ended 500 meters offshore, and the survey lines covered the area around the mouth of Euclid Creek, Villa Angela Beach, Wildwood Marina, and the Easterly Wastewater Treatment Plant. Data were post-processed with a custom MATLAB script. Each water-quality measurement has an associated latitude and longitude (WGS84) and sample depth (in meters) below the surface. All water-quality sensors were calibrated per USGS standard methods prior to the start of the survey. These water-quality measurements were collected over the course of six total days, three in early summer (survey 1) and three in late summer (survey 2), to characterize circulation, mixing, and transport patterns in nearshore Lake Erie in the vicinity of Euclid Creek and Villa Angela Beach.

This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from Indian Creek in Johnson County, Kansas, on May 23, 2013, July 23, 2014, July 30, 2015, and August 26, 2015. Continuous water-quality monitors were used to measure water temperature, specific conductance, pH, turbidity, dissolved oxygen, chlorophyll, phycocyanin, nitrate, and fluorescent dissolved organic matter (fDOM) at 30-second intervals along a 13.3-kilometer reach of Indian Creek. This data release was produced in compliance with the federal open-data requirements as a way to make scientific products associated with USGS research efforts and publications available to the public. This dataset includes all continuously (30-second intervals) measured spatial data collected as part of a study to describe the spatiotemporal variability of nutrients in Indian Creek.

This U.S. Geological Survey (USGS) Data Release provides continuously measured water-quality data collected from four Indian Creek sites in Johnson County, Kansas during July 22-25, 2014 and August 21-27, 2015. Water-quality monitors were used to measure water temperature, dissolved oxygen, pH, specific conductance, turbidity, chlorophyll, phycocyanin, and nitrate at fifteen-minute intervals. This data release was produced in compliance with the federal open-data requirements as a way to make scientific products associated with USGS research efforts and publications available to the public. This dataset includes all continuously-measured data collected at short-term fixed site locations as part of a study to describe the spatiotemporal variability of nutrients in Indian Creek.

This U.S. Geological Survey (USGS) Data Release provides continuously measured water-quality data collected from four Indian Creek sites in Johnson County, Kansas during July 22-25, 2014 and August 21-27, 2015. Water-quality monitors were used to measure water temperature, dissolved oxygen, pH, specific conductance, turbidity, chlorophyll, phycocyanin, and nitrate at fifteen-minute intervals. This data release was produced in compliance with the federal open-data requirements as a way to make scientific products associated with USGS research efforts and publications available to the public. This dataset includes all continuously-measured data collected at short-term fixed site locations as part of a study to describe the spatiotemporal variability of nutrients in Indian Creek.

The dataset includes water-quality sensor readings collected by the U.S Geological Survey (USGS) from the Caloosahatchee River at the Franklin Lock and Dam and 12 open-air fiberglass tanks filled with Caloosahatchee River water used for mesocosm experiments testing the effects of elevated nutrients on harmful algal bloom (HAB) dynamics. This dataset contains water quality sensor readings from two of eight total independent experiments conducted from June 8-11, 2020 and September 14-17, 2020. Each of the 12 tanks were randomly treated with either ammonium hydroxide, sodium nitrate, sodium phosphate, or left untreated (controls) for a total of three replicates of each treatment. The tanks were treated with incrementally higher dosing solutions every 24 hours for the first three days of the four-day experiment (T0, T24, and T48). Biological and nutrient concentration samples were collected each day before and after the dosing solution was applied and at T72, the final day of the experiment. Water-quality sensor data were collected on all four days (T0, T24, T48, T72) at three depths within each tank and the river using a multi-parameter water-quality sonde before the dosing solutions were applied. Each point reading is provided as an instantaneous measurement. Water-quality parameters measured include chlorophyll fluorescence, dissolved oxygen, fluorescence of dissolved organic matter, pH, phycocyanin fluorescence, specific conductance, turbidity, and water temperature. The data is provided as a table in comma delimited format.

The dataset includes water-quality sensor readings collected by the U.S Geological Survey (USGS) from the Caloosahatchee River at the Franklin Lock and Dam and 12 open-air fiberglass tanks filled with Caloosahatchee River water used for mesocosm experiments testing the effects of elevated nutrients on harmful algal bloom (HAB) dynamics. This dataset contains water quality sensor readings from two of eight total independent experiments conducted from June 8-11, 2020 and September 14-17, 2020. Each of the 12 tanks were randomly treated with either ammonium hydroxide, sodium nitrate, sodium phosphate, or left untreated (controls) for a total of three replicates of each treatment. The tanks were treated with incrementally higher dosing solutions every 24 hours for the first three days of the four-day experiment (T0, T24, and T48). Biological and nutrient concentration samples were collected each day before and after the dosing solution was applied and at T72, the final day of the experiment. Water-quality sensor data were collected on all four days (T0, T24, T48, T72) at three depths within each tank and the river using a multi-parameter water-quality sonde before the dosing solutions were applied. Each point reading is provided as an instantaneous measurement. Water-quality parameters measured include chlorophyll fluorescence, dissolved oxygen, fluorescence of dissolved organic matter, pH, phycocyanin fluorescence, specific conductance, turbidity, and water temperature. The data is provided as a table in comma delimited format.

Water-quality constituents were measured along planned survey lines, which were generally perpendicular to the shoreline and spaced 100 meters apart, over an approximately 2.3-mile section of nearshore Lake Erie on June 10-12, 2019 (survey 1), and August 19-21, 2019 (survey 2), using a YSI 6920 V2 multiparameter sonde towed from the side of a marine survey vessel at about 1-ft depth. Water-quality data collected in this area included near-surface measurements of water temperature, specific conductance, pH, dissolved oxygen, and turbidity. The water-quality data were measured at 5-second intervals and were geo-referenced with a global navigation satellite system (GNSS) smart antenna with submeter accuracy. There was a total of 43 survey lines which typically started about 50 meters offshore and ended 500 meters offshore, and the survey lines covered the area around the mouth of Euclid Creek, Villa Angela Beach, Wildwood Marina, and the Easterly Wastewater Treatment Plant. Additional data were also measured along a series of lines parallel to the shoreline throughout the survey area. Data were post-processed with a custom MATLAB script to geo-reference the water-quality data based on time stamps and to manually edit the data to remove spikes and other errors. Each water-quality measurement has an associated latitude and longitude (WGS84) and sample depth (in feet) below the surface. All water-quality sensors were calibrated per USGS standard methods prior to the start of the survey. These water-quality measurements were collected over the course of six total days, three in early summer (survey 1) and three in late summer (survey 2), to characterize circulation, mixing, and transport patterns in nearshore Lake Erie in the vicinity of Euclid Creek and Villa Angela Beach.