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Microstructure profiles were taken over 3 years:<\/p>\n
Measurements were collected using an RSI MicroCTD (Rockland Scientific International, Inc.) which sampled shear and temperature microstructure at 512Hz, free-falling at a velocity of 0.8 m\/s (vertical resolution: ~1.5mm). Shear microstructure was analyzed to obtain turbulent kinetic energy dissipation (see data processing). Velocity shear was measured using two velocity shear probes (RSI; accuracy: 5%) oriented perpendicularly to collect orthogonal shear components. Microstructure temperatures were collected using 2 FP07 probes (accuracy: 0.005 ), with the resulting measurements averaged to produce the single temperature estimate included in the attached files. Turbidity (accuracy: 2%) and fluorescence (accuracy: 1%) measurements were collected using a JAC-CLTU sensor (JFE Advantech Co., Ltd).\u00a0\u00a0<\/p>\n
Microstructure profiles were collected manually by letting the instrument free fall through the water column. Profiles were timed and manually stopped to prevent the instrument from crashing into the bed and damaging sensors.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"MCTD Lake Michigan 2017\/2018\/2019","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":"
Turbulent microstructure profiles were collected near Milwaukee, WI, during 2017 (August 1 - August 16), 2018 (April 5 \u2013 April 20), and 2019 (May 13 - May 14) at a 55m depth site. Microstructure measurements were collected using an RSI MicroCTD (Rockland Scientific International, Inc.), which measures velocity shear, temperature, turbidity, and chlorophyll concentrations. High resolution velocity shear (512 Hz) measurements were used to estimate turbulent kinetic energy dissipation throughout the water column. Microstructure profiles were collected during fair weather conditions on each day of sampling.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"MCTD Lake Michigan 2017, 2018 & 2019","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":"
Data were downloaded from the instrument and converted to physical units using Matlab software provided by the manufacturer. The energy spectra of vertical velocity shear were used to estimate turbulent kinetic energy dissipation using a combination of power spectral density function integration and Nasmyth empirical spectrum fitting (manufacturer-provided algorithms; see attached TN_028_Dissipation.pdf).<\/p>\n
Energy spectra were calculated from 2s (1024 sample) measurement intervals overlapped by 50% (vertical resolution: 0.8m), with corrections for both instrument accelerations and probe-induced spatial averaging (see attached TN_028_Dissipation.pdf).<\/p>\n
The mean absolute deviation (MAD) was used to identify and discard all observed spectra that were effected by anisotropy or deviated significantly from the shape of the model spectrum, with a rejection criteria of MAD>2(2\/d)1\/2, where d is degrees of freedom of the observed spectra.\u00a0<\/p>\n
BCO-DMO Processing Notes:
\n-\u00a0added conventional header with dataset name, PI name, version date
\n- modified parameter names to conform with BCO-DMO naming conventions
\n- added ISO_DateTime_UTC column with converted DOY_GMT into ISO 8601 format.
\n- added \"profile_name\" column to contain information about the name of the profile.
\n- added columns\u00a0'DOY_GMT', 'latitude', 'longitude'\u00a0 from supplementary file, using the \"profile_name\" column as the join key.<\/p>\n
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Microstructure measurements were collected using an RSI MicroCTD (Rockland Scientific International, Inc.), which measures velocity shear, temperature, turbidity, and chlorophyll concentrations. High resolution velocity shear (512 Hz) measurements were used to estimate turbulent kinetic energy dissipation throughout the water column. Microstructure profiles were collected during fair weather conditions on each day of sampling.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/ocean-data.org\/schema\/temporalExtent":[{"@value":"_:temporalExtent768011"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage768011"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Cannon, D., Troy, C., Bootsma, H., Liao, Q. 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