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33 results for “Secchi depth”
Arctic LTER site, station Toolik Lake, study of secchi disk depth (vertical) in units of meter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Arctic LTER (ARC) contains secchi disk depth (vertical) measurements in meter units and were aggregated to a yearly timescale.
Florida Coastal Everglades site, station Bob Allen Key, Taylor Slough/Panhandle Site 10, study of secchi disk depth (vertical) in units of meter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Florida Coastal Everglades (FCE) contains secchi disk depth (vertical) measurements in meter units and were aggregated to a yearly timescale.
Florida Coastal Everglades site, station Sprigger Bank, Taylor Slough/Panhandle Site 11, study of secchi disk depth (vertical) in units of meter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Florida Coastal Everglades (FCE) contains secchi disk depth (vertical) measurements in meter units and were aggregated to a yearly timescale.
Florida Coastal Everglades site, station Duck Key, Taylor Slough/Panhandle Site 9, study of secchi disk depth (vertical) in units of meter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Florida Coastal Everglades (FCE) contains secchi disk depth (vertical) measurements in meter units and were aggregated to a yearly timescale.
California Current Ecosystem site, station Inshore Area at California Current Ecosystem LTER, study of secchi disk depth (vertical) in units of meter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from California Current Ecosystem (CCE) contains secchi disk depth (vertical) measurements in meter units and were aggregated to a yearly timescale.
Weekly and high frequency temperature profile data and Secchi depth, Mohonk Lake, NY, USA, 1985 to 2017
We, the staff, volunteers and associates of the Mohonk Preserve, have been collecting profiles of temperature data and Secchi depths in Mohonk Lake beginning in 1985. Mohonk Lake is small (6.9 ha), deep (zmax=18.5m), oligo-mesotrophic lake, dimictic, glacially formed system on the northern Shawangunk Ridge, New York State, USA. The temperature profiles can provide information on the lake thermal structure and can be used to calculate physical variables such as thermocline depth and thermal stability. We collected data weekly with two exceptions: 1) 01 Jan 1985 to 09 August 1985 when temperature profiles were collected daily and 2) in 2017, when temperature profiles were collected every 15 minutes and down-sampled to daily means.
Secchi disk depth (ZSD) measurements in the California Current 1949-2021
The Secchi disk depth (ZSD) measurements made in the California Current 1949-2021 were compiled from multiple sources but mostly from the California Cooperative Oceanic Fisheries Investigations (CalCOFI) cruises. An earlier version of this dataset was described in Aksnes, D.L., and M.D. Ohman. 2009. Multi-decadal shoaling of the euphotic zone in the southern sector of the California Current System. Limnol. Oceanog. 54, 1272–1281. This updated dataset was used in Kahru, M., Z. Lee, and M.D. Ohman. 2023. Multidecadal changes in ocean transparency: decrease in a coastal upwelling region and increase offshore. Limnol. Oceanogr., in press.
Results of OLCI-derived Secchi disk depth in lakes across Eastern China
<p><em>Water clarity, represented by Secchi disk depth (Zsd), is the first-order indicator of water quality. This dataset contains Zsd of 86 major large lakes with an area greater than 30 km2 in East China estimated using a random forest regression (RFR)-based Zsd model. Scientists from optical remote sensing and aquatic sciences can use this dataset for their research.</em></p>
Massachusetts Department of Conservation and Recreation (DCR): Quabbin Reservoir and Ware River watershed Secchi depth, 2005-2008
The Department of Conservation and Recreation, Division of Water Supply Protection is the state agency charged with the responsibility of managing Quabbin Reservoir and its surrounding natural resources in order to protect, preserve and enhance the environment of the Commonwealth and to assure the availability of pure water to future generations. As part of this effort, the Environmental Quality Section maintains a comprehensive water quality monitoring program to ensure that Quabbin Reservoir and its tributaries meet state water quality standards. As part of this task, the Environmental Quality Section performs the necessary field work, interprets water quality data and prepares reports of findings. This annual summary is intended to meet the needs of the decision makers, the concerned public and others whose decisions must reflect water quality considerations
Douglas Lake (MI) South Fishtail Bay Secchi Depth dataset
Secchi depth readings for South Fishtail Bay, Douglas Lake, MI taken by associates of the University of Michigan Biological Station (UMBS). First reading is from 1925 but sampling intensity increases in the 1970's. Values range from 2.25 m to 7 m. In the early 1970s the University of Michigan Biological Station initiated a series of research projects concerning the quality of the lakes in Northern Michigan under the support of the National Science Foundation through the Research Applied to National Needs (RANN) program. Dr. John Gannon joined the Biological Station's staff in 1972 and directed this program for six years. This research had significant impacts on water quality management of lakes throughout Northern Michigan. The Biological Station continued to receive grants for water quality research for several years after the RANN program had terminated. The Tip of the Mitt Watershed Council has coordinated and sponsored the Volunteer Lake Monitoring Program for over 20 years. Presently, volunteers monitor 35 lakes spread throughout Antrim, Charlevoix, Cheboygan, Emmet, and Montmorency Counties (map below). The objectives of the program are to collect baseline data, characterize lake ecosystems, identify specific water quality problems, determine water quality trends, and, most importantly, inform and educate the public regarding water quality issues and aquatic ecology. Monitoring water quality does not ensure clean water, but rather provides valuable information to help protect and improve water quality in the lakes of northern Lower Peninsula of Michigan.
USGS Shingobee Lake (MN) Secchi Depth dataset 1989-2010
The Interdisciplinary Research Initiative (IRI) provides the opportunity for fundamental interdisciplinary research of interactions within the hydrologic system on a watershed scale, to increase the basic understanding of watershed hydrology, and to provide information necessary for better management of our Nation's water resources. Management of water resources often is dependent on understanding the effects of residence time on ecosystem processes. The focus of the Minnesota IRI is on aquatic systems that have greatly different water and, presumably, chemical residence times. Research on the hydrology, geochemistry, and limnology of the Williams Lake watershed began in 1978, and reports describing the hydrologic setting, limnology, and geochemistry of the site are available on request. Study of the interaction of the lake with ground water, evaporation, and biogeochemistry has continued to the present (1993). Study of the Shingobee Lake site began in 1989 at the inception of the IRI effort.
USGS Williams Lake (MN) Secchi Depth Dataset
Research on the hydrology, geochemistry, and limnology of the Williams Lake watershed began in 1978, and reports describing the hydrologic setting, limnology, and geochemistry of the site are available on request.
Mean annual Secchi depth measurements in the period starting in 1969 provide a measure of water column transparency in the CalCOFI inshore and offshore areas, 1969 - 2004.
The Secchi depth provides a measure of water turbidity. Measurements are made as part of the California Fisheries Cooperative Investigations (CalCOFI). Secchi depth is measured on each station on each cruise. The mean annual is obtained by averaging stations over time and at stations defined as either inshore or offshore.
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