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Title Sum-
Institution Dataset ID
   set  data   graph     files  public Microstructure profiles at Station AT55 in Lake Michigan aboard the R/V Osprey from 2018-04-
05 to 2018-04-20
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL access_formats String .htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt
attribute NC_GLOBAL acquisition_description String 129 microstructure profiles were collected over three days (April 5th, 12th,
and 20th). 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.,

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
attribute NC_GLOBAL awards_0_award_nid String 670677
attribute NC_GLOBAL awards_0_award_number String OCE-1658390
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_0_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_0_funding_source_nid String 355
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Lake Michigan Microstructure Data, Station AT55, April 2018
PI: Cary Troy
Version: 2019-05-15
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL data_source String extract_data_as_tsv version 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2019-05-15T15:02:41Z
attribute NC_GLOBAL date_modified String 2019-05-20T16:54:49Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.768011.1
attribute NC_GLOBAL Easternmost_Easting double -87.753217
attribute NC_GLOBAL geospatial_lat_max double 43.069917
attribute NC_GLOBAL geospatial_lat_min double 43.069917
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -87.753217
attribute NC_GLOBAL geospatial_lon_min double -87.753217
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/768011 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String CTD
attribute NC_GLOBAL instruments_0_dataset_instrument_description String 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).
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 768014
attribute NC_GLOBAL instruments_0_description String The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column and permits scientists observe the physical properties in real time via a conducting cable connecting the CTD to a deck unit and computer on the ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This instrument designation is used when specific make and model are not known.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/130/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String CTD profiler
attribute NC_GLOBAL instruments_0_instrument_nid String 417
attribute NC_GLOBAL instruments_0_supplied_name String RSI MicroCTD (Rockland Scientific International, Inc.)
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, chlor, chlorophyll, data, dataset, date, dissipation, dmo, doy, DOY_GMT, erddap, iso, latitude, longitude, management, name, oceanography, office, preliminary, pressure, profile, profile_name, temperature, time, turb
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/768011/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/768011 (external link)
attribute NC_GLOBAL Northernmost_Northing double 43.069917
attribute NC_GLOBAL param_mapping String {'768011': {'latitude': 'flag - latitude', 'longitude': 'flag - longitude', 'ISO_DateTime_UTC': 'flag - time'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/768011/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Purdue University
attribute NC_GLOBAL people_0_person_name String Cary Troy
attribute NC_GLOBAL people_0_person_nid String 670685
attribute NC_GLOBAL people_0_role String Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String University of Wisconsin
attribute NC_GLOBAL people_1_affiliation_acronym String UW-Milwaukee
attribute NC_GLOBAL people_1_person_name String Harvey Bootsma
attribute NC_GLOBAL people_1_person_nid String 670682
attribute NC_GLOBAL people_1_role String Co-Principal Investigator
attribute NC_GLOBAL people_1_role_type String originator
attribute NC_GLOBAL people_2_affiliation String Purdue University
attribute NC_GLOBAL people_2_person_name String David Cannon
attribute NC_GLOBAL people_2_person_nid String 767967
attribute NC_GLOBAL people_2_role String Co-Principal Investigator
attribute NC_GLOBAL people_2_role_type String originator
attribute NC_GLOBAL people_3_affiliation String University of Wisconsin
attribute NC_GLOBAL people_3_affiliation_acronym String UW-Milwaukee
attribute NC_GLOBAL people_3_person_name String Qian Liao
attribute NC_GLOBAL people_3_person_nid String 670687
attribute NC_GLOBAL people_3_role String Co-Principal Investigator
attribute NC_GLOBAL people_3_role_type String originator
attribute NC_GLOBAL people_4_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_4_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_4_person_name String Mathew Biddle
attribute NC_GLOBAL people_4_person_nid String 708682
attribute NC_GLOBAL people_4_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_4_role_type String related
attribute NC_GLOBAL project String Filter Feeders Physics and Phosphorus
attribute NC_GLOBAL projects_0_acronym String Filter Feeders Physics and Phosphorus
attribute NC_GLOBAL projects_0_description String Overview:
While benthic filter feeders are known to influence plankton and nutrient dynamics in shallow marine and freshwater systems, their role is generally considered to be minor in large, deep systems. However, recent evidence indicates that profundal quagga mussels (Dreissena rostriformis bugensis) have dramatically altered energy flow and nutrient cycling in the Laurentian Great Lakes and other larges aquatic systems, so that conventional nutrient-plankton paradigms no longer apply. Observed rates of phosphorus grazing by profundal quagga mussels in Lake Michigan exceed the passive settling rates by nearly an order of magnitude, even under stably stratified conditions. We hypothesize that the apparently enhanced particle deliver rate to the lake bottom results from high filtration capacity combined with vertical mixing processes that advect phytoplankton from the euphotic zone to the near-bottom layer. However, the role of hydrodynamics is unclear, because these processes are poorly characterized both within the hypolimnion as a whole and within the near-bottom layer. In addition, the implications for phytoplankton and nutrient dynamics are unclear, as mussels are also important nutrient recyclers. In the proposed interdisciplinary research project, state-of-the-art instruments and analytical tools will be deployed in Lake Michigan to quantify these critical dynamic processes, including boundary layer turbulence, mussel grazing, excretion and egestion, and benthic fluxes of carbon and phosphorus. Empirical data will be used to calibrate a 3D hydrodynamic-biogeochemical model to test our hypotheses.
Intellectual Merit:
This collaborative biophysical project is structured around two primary questions: 1) What role do profundal dreissenid mussels play in large lake carbon and nutrient cycles? 2) How are mussel grazing and the fate of nutrients recycled by mussels modulated by hydrodynamics at scales ranging from mm (benthic boundary layer) to meters (entire water column)? The project will improve the ability to model nutrient and carbon dynamics in coastal and lacustrine waters where benthic filter-feeders are a significant portion of the biota. By so doing, it will address the overarching question of how plankton and nutrient dynamics in large, deep lakes with abundant profundal filter feeders differ from the conventional paradigm described by previous models. Additionally, the project will quantify and characterize boundary layer turbulence for benthic boundary layers in large, deep lakes, including near-bed turbulence produced by benthic filter feeders.
Broader Impacts:
The project will provide new insight into the impacts of invasive dreissenid mussels, which are now threatening many large lakes and reservoirs across the United States. Dreissenid mussels appear to be responsible for a number of major changes that have occurred in the Great Lakes, including declines of pelagic plankton populations, declines in fish populations, and, ironically, nuisance algal blooms in the nearshore zone. As a result, conventional management models no longer apply, and managers are uncertain about appropriate nutrient loading targets and fish stocking levels. The data and models resulting from this project will help to guide those decisions. Additionally, the project will provide insight to bottom boundary layer physics, with applicability to other large lakes, atidal coastal seas, and the deep ocean. The project will leverage the collaboration and promote interdisciplinary education for undergraduate and graduate students from two universities (UW-Milwaukee and Purdue). The project will support 3 Ph.D. students and provide structured research experiences to undergraduates through a summer research program. The project will also promote education of future aquatic scientists by hosting a Biophysical Coupling Workshop for graduate students who participate in the annual IAGLR conferences, and the workshop lectures will be published for general access through ASLO e-Lectures and on an open-access project website.
Background publications are available at:https://onlinelibrary.wiley.com/doi/10.1002/2014JC010506/fullhttp://link.springer.com/article/10.1007/s00348-012-1265-9http://aslo.net/lomethods/free/2009/0169.pdfhttp://www.sciencedirect.com/science/article/pii/S0380133015001458
Note: This is an NSF Collaborative Research Project.
attribute NC_GLOBAL projects_0_geolocation String Lake Michigan
attribute NC_GLOBAL projects_0_name String Collaborative Research: Regulation of plankton and nutrient dynamics by hydrodynamics and profundal filter feeders
attribute NC_GLOBAL projects_0_project_nid String 670679
attribute NC_GLOBAL publisher_name String Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 43.069917
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL subsetVariables String latitude,longitude
attribute NC_GLOBAL summary String Turbulent microstructure profiles were collected near Milwaukee, WI, during 2018 between April 5 \u2013 April 20, 2018 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 April 5th, 12th, and 20th.
attribute NC_GLOBAL time_coverage_end String 2018-04-20T18:06:53Z
attribute NC_GLOBAL time_coverage_start String 2018-04-05T18:10:10Z
attribute NC_GLOBAL title String Microstructure profiles at Station AT55 in Lake Michigan aboard the R/V Osprey from 2018-04-05 to 2018-04-20
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -87.753217
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable profile_name   String  
attribute profile_name bcodmo_name String cast
attribute profile_name description String profile name extracted from submitted file name
attribute profile_name long_name String Profile Name
attribute profile_name units String unitless
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 43.069917, 43.069917
attribute latitude axis String Y
attribute latitude bcodmo_name String latitude
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude description String latitude with positive values northward
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LATX/ (external link)
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double NaN
attribute longitude actual_range double -87.753217, -87.753217
attribute longitude axis String X
attribute longitude bcodmo_name String longitude
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude description String longituide with positive values eastward
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LONX/ (external link)
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable DOY_GMT   double  
attribute DOY_GMT _FillValue double NaN
attribute DOY_GMT actual_range double 95.7570647922617, 110.754786829747
attribute DOY_GMT bcodmo_name String unknown
attribute DOY_GMT description String time corresponding to each profile name. Times are taken as the average of measurement times for a given profile. Time units are days in GMT.
attribute DOY_GMT long_name String DOY GMT
attribute DOY_GMT units String unitless
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.52295181E9, 1.524247613E9
attribute time axis String T
attribute time bcodmo_name String ISO_DateTime_UTC
attribute time description String Date and time formatted following ISO8601 convention
attribute time ioos_category String Time
attribute time long_name String ISO Date Time UTC
attribute time nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/ (external link)
attribute time source_name String ISO_DateTime_UTC
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time time_precision String 1970-01-01T00:00:00Z
attribute time units String seconds since 1970-01-01T00:00:00Z
variable pressure   double  
attribute pressure _FillValue double NaN
attribute pressure actual_range double 1.76301003345858, 51.8271251079746
attribute pressure bcodmo_name String pressure
attribute pressure description String average pressure at measurement location
attribute pressure long_name String Pressure
attribute pressure nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/PRESPR01/ (external link)
attribute pressure units String decibar (dbar)
variable temp   double  
attribute temp _FillValue double NaN
attribute temp actual_range double 2.59696745459734, 3.31354022090128
attribute temp bcodmo_name String temperature
attribute temp description String average temperature
attribute temp long_name String Temperature
attribute temp nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/TEMPP901/ (external link)
attribute temp units String degrees Celsius
variable S2   double  
attribute S2 _FillValue double NaN
attribute S2 actual_range double 0.0186852554110757, 1.6843117779088101
attribute S2 bcodmo_name String unknown
attribute S2 description String average total velocity shear (S2=[dU/dz]2+[dV/dz]2
attribute S2 long_name String S2
attribute S2 units String 1/s2
variable turb   double  
attribute turb _FillValue double NaN
attribute turb actual_range double 0.799901315748123, 0.996168509579626
attribute turb bcodmo_name String turbidity
attribute turb description String average turbidity
attribute turb long_name String Turb
attribute turb units String FTU
variable chlor   double  
attribute chlor _FillValue double NaN
attribute chlor actual_range double 0.799901315748123, 0.996168509579626
attribute chlor bcodmo_name String fluorescence
attribute chlor description String average fluorescence
attribute chlor long_name String Chlor
attribute chlor nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/ (external link)
attribute chlor units String ppb
variable dissipation   double  
attribute dissipation _FillValue double NaN
attribute dissipation actual_range double 2.0905364546678E-10, 6.233666502474389E-6
attribute dissipation bcodmo_name String unknown
attribute dissipation description String turbulent kinetic energy dissipation calculated from shear signal
attribute dissipation long_name String Dissipation
attribute dissipation units String Watts per kilogram (W/kg)

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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