Browsing by Subject "currents"

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    2010 Lake Superior Mooring Deployment Campaign
    (2021-03-10) Austin, Jay A; jaustin@d.umn.edu; Austin, Jay; University of Minnesota Duluth, Large Lakes Observatory
    Since 2005, investigators at UM Duluth's Large Lakes Observatory have been deploying sub-surface moorings in Lake Superior to investigate thermal structure and currents. This submission contains all temperature and current data from deployments that occurred in 2010.
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    A Flourometric Technique for Sampling in Large-River Ecosystems
    (Water Resources Research Center, University of Minnesota, 1971-06) Johann, D.R.; McNabb, C.D.; Miller, E.F.
    Boat-mounted equipment for detecting the movement of rhodamine WT was used in Pool 6 of the upper Mississippi Rover, between navigation dams at Trempealeau, Wisconsin and Winona, Minnesota, to develop a procedure for sampling on paths of turbulent flow in large-river ecosystems. A means of relating sampling points in space and time is described. The expression Cm = (c2 . n) -c1/n-1 where c1 and c2 are concentrations of suspended or dissolved materials on upstream and downstream transects and n is a measure of dilution, can be used to obtain the mean concentration of material in suspension or solution in the water between points that are separated by at least as much as 2400 meters. This procedure in combination with conventional sampling programs in quiet backwaters may allow for more rigorous analysis of large-river ecosystems than has been achieved.
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    Lake Superior moored temperature and currents, Spring 2015 to Spring 2021
    (2022-04-15) Elmer, Cassandra; Austin, Jay A; jaustin@d.umn.edu; Austin, Jay A; University of Minnesota, Duluth Large Lakes Observatory
    This document describes the data archive for 2015-2020 Lake Superior moorings. Data types include temperature, velocity, and acoustic backscatter. Temperature data comes from thermistors and 𝜒pods while velocity and acoustic backscatter intensity data comes from Acoustic Doppler Current Profilers (ADCPs). Covered in this dataset are 46 mooring deployments, 514 thermistor records, 10 𝜒pod records, and 26 ADCP records. This archival entry covers moorings deployed in 2015 through 2020; data from 2020 deployments extends into 2021. See also the previous archival entry for 2005-2014 deployments (Austin and Elmer 2021) and archival entries for the Radiatively Driven Convection (RDC) deployments of 2019 (Austin 2020) and 2021 (Elmer and Austin in progress).
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    Radiatively Driven Convection, 2019 field campaign
    (2020-10-23) Austin, Jay A; jaustin@d.umn.edu; Austin, Jay A; University of Minnesota Duluth, Large Lakes Observatory
    From May-July 2019, a large array of equipment was deployed in western Lake Superior to study a process called Radiatively Driven Convection (RDC). This occurs when solar radiation is incident on fresh water whose temperature is below the temperature of maximum density, heating and densifying surface waters, driving convection. The goal of the project was to characterize the spatial and temporal scales of this convective process.