nuShuttle_1130_b0f0_f109

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Narragansett Bay Monthly Transect (NuShuttle)

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nuShuttle_1130_b0f0_f109

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Point
attribute	NC_GLOBAL	comment	String	Attribute Accuracy Report: The temperature sensor was accurate to within 0.003 degrees C however due to a lag in response time of the sensor as it was towed through the water, results were only reported to within 0.01 degrees C. Conductivity measurements were accurate to within 0.005 mmho/cm. The accuracy of salinity values derived from these conductivity measurements varies with temperature and pressure, however under typical environmental conditions values should be within 0.01 psu or better. The calibration of the conductivity cell was tested in the lab using a resistor of known resistance prior to the cruise. Chlorophyll concentrations are accurate to within 3%, however, chlorophyll readings are from in vivo fluorescence, whereas the instrument was calibrated using a chlorophyll standard in acetone, and as a result the chlorophyll fluorescence can be expected to underestimate the overall concentration due to effects such as cell shading, scattering and photochemical quenching of fluorescence. This was illustrated by samples taken for lab analysis at calibration stations during this and previous cruises with this sensor. It was found that the in situ in vivo readings can underestimate the lab extracted chlorophyll estimates by over a factor of 3. The chlorophyll values presented here are the uncorrected in vivo values. Oxygen readings were accurate to within 2% of saturation (i.e. accuracy is partly dependent on salinity, temperature and pressure which determine the saturation value for dissolved oxygen). Prior to the cruise the oxygen sensor was lab calibrated using an oxygen saturated seawater bath at equilibrium with the atmosphere, and Winkler titrations were used to verify the oxygen concentration of the calibration bath. Logical Consistency Report: Data were processed using a Matlab routine that checks for out of range values. Any positions for which the degrees column does not equal 41 degrees north latitude or 71 degrees west longitude were deleted. Any temperature values not between -2 an 29 degrees C were deleted. Chlorophyll values were deleted if they were not between 0 and 30 mg m^-3. Pressure values not between 0 and 35 dbars were omitted. Conductivity values less than 0 were omitted. Three calibration stations were performed during the cruise at which samples were taken for to measure chlorophyll, oxygen, salinity and temperature independently. These measurements were used as a check on the sensor data. In the event that the calibrations samples indicated a problem with the sensor data, action would be taken to correct or eliminate those results as needed. At each calibration station the depth readings are also checked against 2 independent depth sensors, while the sensor is hanging at an approximately known depth. Anytime the oxygen sensor was restarted the first 2 minutes of data were discarded from the dataset due to the time required for the SBE-13 oxygen electrode to ionize. Completeness Report: Some data points were omitted from this data set. These data points typically corresponded to very near surface samples where the instruments were breaching the surface of the water, causing anomalous readings. Horizontal Positional Accuracy Report: All horizontal positions were determined by differential GPS with an accuracy of +/- 5 meters. Vertical Positional Accuracy Report: Depths were determined by a pressure sensor accurate to within 0.2 dbars (1 dbar is approximately equivalent to 1 meter of depth). Process Description: This data was collected during a research cruise in Narragansett Bay, RI aboard the R/V Capn Bert. Data was collected using a Chelsea Technologies Group (CTG) NuShuttle towed undulating sampling platform permitting underway profiling of the water column. The NuShuttle contained a CTG Aquapak CTD/Fluorometer that measured conductivity (salinity), temperature, pressure (depth) and chlorophyll fluorescence. Oxygen data was collected using a Seabird SBE-13 dissolved oxygen sensor. Prior to each cruise the oxygen sensor is calibrated in the lab, and the CTD is tested to ensure accurate readings. The cruise began at Quonset Point in the West Passage of Narragansett Bay. The ship headed south into RI Sound, then north into the East Passage of Narragansett Bay to Mt. Hope Bay and Fall River, then to Fields Point in the Providence River, then south down the West Passage returning to Quonset Point. The tow speed was maintained at approximately 8 knots. Calibration stations were performed at the beginning and end of the cruise, as well as during the cruise at near the Newport bridge to verify results. Following the cruise all data were processed by a Matlab routine that calibrates the raw instrument output, and removes anomalous values. Latitude Resolution: 0.001 minutes. Longitude Resolution: 0.001 minutes. Horizontal Datum Name: North American Datum of 1983. Ellipsoid Name: Geodetic Reference System 80. Semi-Major Axis: 6378137 meters. Denominator of Flattening: 298.257. Depth Resolution: 0.1 meters. Entity Type Label: NuShuttle transect. Entity Type Definition: Measurements of salinity, temperature, dissolved oxygen and chlorophyll made underway using a towed undulating NuShuttle sampling platform. Attribute Definition: The salt content of the water derived from measurements of conductivity by a Chelsea Technologies Group Aquapak CTD/Fluorometer. Conductivity is used to estimate salinity according to the practical salinity scale of 1978. Attribute Definition: Water temperature measured by a Chelsea Technologies Group Aquapak CTD/Flourometer. Attribute Definition: Chlorophyll concentration determined by in situ measurements of in vivo chlorophyll a fluorescence using a Chelsea Technologies Group CTD/Fluorometer. Attribute Definition: Dissolved oxygen concentration measured using a Seabird SBE-13 oxygen sensor. Distribution Liability: This data set is provided as is and free of charge. No warranty is expressed or implied by the National Marine Fisheries Service.
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	mberman at mola.na.nmfs.gov
attribute	NC_GLOBAL	creator_name	String	MBERMAN
attribute	NC_GLOBAL	creator_type	String	institution
attribute	NC_GLOBAL	Easternmost_Easting	double	-71.17775
attribute	NC_GLOBAL	featureType	String	Point
attribute	NC_GLOBAL	geospatial_lat_max	double	41.8
attribute	NC_GLOBAL	geospatial_lat_min	double	41.377167
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-71.17775
attribute	NC_GLOBAL	geospatial_lon_min	double	-71.434667
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	34.195
attribute	NC_GLOBAL	geospatial_vertical_min	double	-0.069
attribute	NC_GLOBAL	geospatial_vertical_positive	String	down
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	history	String	Converted from csv files at NarrBay.org
attribute	NC_GLOBAL	infoUrl	String	???
attribute	NC_GLOBAL	institution	String	National Marine Fisheries Service
attribute	NC_GLOBAL	keywords	String	bay, chemistry, Chl, chla, chlorophyll, chlorophyll-a, concentration, concentration_of_chlorophyll_in_sea_water, conductivity, cruise, ctd, data, density, depth, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Temperature > Water Temperature, Earth Science > Oceans > Salinity/Density > Density, Earth Science > Oceans > Salinity/Density > Salinity, fisheries, global, gps, latitude, longitude, marine, mass, month, monthly, narragansett, national, nmfs, number, nushuttle, O2, O2sat, ocean, oceans, oxygen, positioning, practical, pss, S_P, salinity, scale, science, sea, sea_water_practical_salinity, sea_water_sigma_theta, sea_water_temperature, seawater, sensor, service, sigma, sigma0, sonde, system, temperature, theta, time, transect, turbid, turbidity, water
attribute	NC_GLOBAL	keywords_vocabulary	String	GCMD Science Keywords
attribute	NC_GLOBAL	license	String	The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
attribute	NC_GLOBAL	Northernmost_Northing	double	41.8
attribute	NC_GLOBAL	references	String	Narragansett Bay Window Project, Mark Berman, mberman@mola.na.nmfs.gov
attribute	NC_GLOBAL	source	String	NarrBay.org
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	41.377167
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	subsetVariables	String	Chl
attribute	NC_GLOBAL	summary	String	Narragansett Bay Monthly Transect. Attribute Accuracy Report: The temperature sensor was accurate to within 0.003 degrees C however due to a lag in response time of the sensor as it was towed through the water, results were only reported to within 0.01 degrees C. Conductivity measurements were accurate to within 0.005 mmho/cm. The accuracy of salinity values derived from these conductivity measurements varies with temperature and pressure, however under typical environmental conditions values should be within 0.01 psu or better. The calibration of the conductivity cell was tested in the lab using a resistor of known resistance prior to the cruise. Chlorophyll concentrations are accurate to within 3%, however, chlorophyll readings are from in vivo fluorescence, whereas the instrument was calibrated using a chlorophyll standard in acetone, and as a result the chlorophyll fluorescence can be expected to underestimate the overall concentration due to effects such as cell shading, scattering and photochemical quenching of fluorescence. This was illustrated by samples taken for lab analysis at calibration stations during this and previous cruises with this sensor. It was found that the in situ in vivo readings can underestimate the lab extracted chlorophyll estimates by over a factor of 3. The chlorophyll values presented here are the uncorrected in vivo values. Oxygen readings were accurate to within 2% of saturation (i.e. accuracy is partly dependent on salinity, temperature and pressure which determine the saturation value for dissolved oxygen). Prior to the cruise the oxygen sensor was lab calibrated using an oxygen saturated seawater bath at equilibrium with the atmosphere, and Winkler titrations were used to verify the oxygen concentration of the calibration bath. Logical Consistency Report: Data were processed using a Matlab routine that checks for out of range values. Any positions for which the degrees column does not equal 41 degrees north latitude or 71 degrees west longitude were deleted. Any temperature values not between -2 an 29 degrees C were deleted. Chlorophyll values were deleted if they were not between 0 and 30 mg m^-3. Pressure values not between 0 and 35 dbars were omitted. Conductivity values less than 0 were omitted. Three calibration stations were performed during the cruise at which samples were taken for to measure chlorophyll, oxygen, salinity and temperature independently. These measurements were used as a check on the sensor data. In the event that the calibrations samples indicated a problem with the sensor data, action would be taken to correct or eliminate those results as needed. At each calibration station the depth readings are also checked against 2 independent depth sensors, while the sensor is hanging at an approximately known depth. Anytime the oxygen sensor was restarted the first 2 minutes of data were discarded from the dataset due to the time required for the SBE-13 oxygen electrode to ionize. Completeness Report: Some data points were omitted from this data set. These data points typically corresponded to very near surface samples where the instruments were breaching the surface of the water, causing anomalous readings. Horizontal Positional Accuracy Report: All horizontal positions were determined by differential Global Positioning System (GPS) with an accuracy of +/- 5 meters. Vertical Positional Accuracy Report: Depths were determined by a pressure sensor accurate to within 0.2 dbars (1 dbar is approximately equivalent to 1 meter of depth). Process Description: This data was collected during a research cruise in Narragansett Bay, RI aboard the R/V Capn Bert. Data was collected using a Chelsea Technologies Group (CTG) NuShuttle towed undulating sampling platform permitting underway profiling of the water column. The NuShuttle contained a CTG Aquapak Conductivity, Temperature, Depth (CTD)/Fluorometer that measured conductivity (salinity), temperature, pressure (depth) and chlorophyll fluorescence. Oxygen data was collected using a Seabird SBE-13 dissolved oxygen sensor. Prior to each cruise the oxygen sensor is calibrated in the lab, and the CTD is tested to ensure accurate readings. The cruise began at Quonset Point in the West Passage of Narragansett Bay. The ship headed south into RI Sound, then north into the East Passage of Narragansett Bay to Mt. Hope Bay and Fall River, then to Fields Point in the Providence River, then south down the West Passage returning to Quonset Point. The tow speed was maintained at approximately 8 knots. Calibration stations were performed at the beginning and end of the cruise, as well as during the cruise at near the Newport bridge to verify results. Following the cruise all data were processed by a Matlab routine that calibrates the raw instrument output, and removes anomalous values. Latitude Resolution: 0.001 minutes. Longitude Resolution: 0.001 minutes. Horizontal Datum Name: North American Datum of 1983. Ellipsoid Name: Geodetic Reference System 80. Semi-Major Axis: 6378137 meters. Denominator of Flattening: 298.257. Depth Resolution: 0.1 meters. Entity Type Label: NuShuttle transect. Entity Type Definition: Measurements of salinity, temperature, dissolved oxygen and chlorophyll made underway using a towed undulating NuShuttle sampling platform. Attribute Definition: The salt content of the water derived from measurements of conductivity by a Chelsea Technologies Group Aquapak CTD/Fluorometer. Conductivity is used to estimate salinity according to the practical salinity scale of 1978. Attribute Definition: Water temperature measured by a Chelsea Technologies Group Aquapak CTD/Flourometer. Attribute Definition: Chlorophyll concentration determined by in situ measurements of in vivo chlorophyll a fluorescence using a Chelsea Technologies Group CTD/Fluorometer. Attribute Definition: Dissolved oxygen concentration measured using a Seabird SBE-13 oxygen sensor. Distribution Liability: This data set is provided as is and free of charge. No warranty is expressed or implied by the National Marine Fisheries Service.
attribute	NC_GLOBAL	time_coverage_end	String	2010-11-16T21:15:30Z
attribute	NC_GLOBAL	time_coverage_start	String	1998-04-21T10:19:57Z
attribute	NC_GLOBAL	title	String	Narragansett Bay Monthly Transect (NuShuttle)
attribute	NC_GLOBAL	Westernmost_Easting	double	-71.434667
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	8.93153997E8, 1.28994213E9
attribute	time	axis	String	T
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	Time
attribute	time	standard_name	String	time
attribute	time	time_origin	String	01-JAN-1970 00:00:00
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z
variable	cruise		byte
attribute	cruise	actual_range	byte	1, 111
attribute	cruise	colorBarMaximum	double	100.0
attribute	cruise	colorBarMinimum	double	0.0
attribute	cruise	long_name	String	NuShuttle_Cruise_Number
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	accuracy	String	within 0.2 m
attribute	latitude	actual_range	double	41.377167, 41.8
attribute	latitude	axis	String	Y
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
attribute	latitude	valid_max	double	41.8
attribute	latitude	valid_min	double	41.35
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	_FillValue	double	NaN
attribute	longitude	accuracy	String	0.001 minutes
attribute	longitude	actual_range	double	-71.434667, -71.17775
attribute	longitude	axis	String	X
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
attribute	longitude	valid_max	double	-71.17
attribute	longitude	valid_min	double	-71.44
variable	depth		float
attribute	depth	_CoordinateAxisType	String	Height
attribute	depth	_CoordinateZisPositive	String	down
attribute	depth	actual_range	float	-0.069, 34.195
attribute	depth	axis	String	Z
attribute	depth	colorBarMaximum	double	8000.0
attribute	depth	colorBarMinimum	double	-8000.0
attribute	depth	colorBarPalette	String	TopographyDepth
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Sensor Depth
attribute	depth	positive	String	down
attribute	depth	standard_name	String	depth
attribute	depth	units	String	m
variable	to		float
attribute	to	_FillValue	float	NaN
attribute	to	accuracy	String	within 0.01 degrees C
attribute	to	actual_range	float	-1.27, 27.57
attribute	to	colorBarMaximum	double	32.0
attribute	to	colorBarMinimum	double	0.0
attribute	to	long_name	String	Sea Water Temperature
attribute	to	standard_name	String	sea_water_temperature
attribute	to	units	String	degree_C
attribute	to	valid_max	float	29.0
attribute	to	valid_min	float	-2.0
variable	S_P		float
attribute	S_P	_FillValue	float	NaN
attribute	S_P	accuracy	String	Conductivity measurements were accurate to within 0.005 mmho/cm, The accuracy of salinity values derived from these conductivity measurements varies with temperature and pressure, however under typical environmental conditions values should be within 0.01 psu or better.
attribute	S_P	actual_range	float	0.0, 33.32
attribute	S_P	colorBarMaximum	double	37.0
attribute	S_P	colorBarMinimum	double	32.0
attribute	S_P	long_name	String	Sea Water Practical Salinity
attribute	S_P	standard_name	String	sea_water_practical_salinity
attribute	S_P	units	String	Practical Salinity Scale of 1978 (PSS-78)
attribute	S_P	valid_max	float	35.0
attribute	S_P	valid_min	float	0.0
variable	Chl		float
attribute	Chl	_FillValue	float	9.96921E36
attribute	Chl	accuracy	String	Chlorophyll concentrations are accurate to within 3%, however, chlorophyll readings are from in vivo fluorescence, whereas the instrument was calibrated using a chlorophyll standard in acetone, and as a result the chlorophyll fluorescence can be expected to underestimate the overall concentration due to effects such as cell shading, scattering and photochemical quenching of fluorescence. This was illustrated by samples taken for lab analysis at calibration stations during this and previous cruises with this sensor. It was found that the in situ in vivo readings can underestimate the lab extracted chlorophyll estimates by over a factor of 3. The chlorophyll values presented here are the uncorrected in vivo values.
attribute	Chl	colorBarMaximum	double	30.0
attribute	Chl	colorBarMinimum	double	0.03
attribute	Chl	colorBarScale	String	Log
attribute	Chl	long_name	String	Mass Concentration Of Chlorophyll In Seawater
attribute	Chl	standard_name	String	concentration_of_chlorophyll_in_sea_water
attribute	Chl	units	String	kg m-3
attribute	Chl	valid_max	float	3.5E-5
attribute	Chl	valid_min	float	0.0
variable	DO		float
attribute	DO	_FillValue	float	NaN
attribute	DO	actual_range	float	0.0, 0.02
attribute	DO	colorBarMaximum	double	200.0
attribute	DO	colorBarMinimum	double	0.0
attribute	DO	long_name	String	Mass Concentration Of Oxygen In Seawater
attribute	DO	source	String	Oxygen readings were accurate to within 2% of saturation
attribute	DO	units	String	kg m-3
attribute	DO	valid_max	float	0.02
attribute	DO	valid_min	float	0.0
variable	O2sat		float
attribute	O2sat	_FillValue	float	NaN
attribute	O2sat	actual_range	float	0.0, 3.53425
attribute	O2sat	colorBarMaximum	double	200.0
attribute	O2sat	colorBarMinimum	double	0.0
attribute	O2sat	long_name	String	Sea Water Sigma Theta
attribute	O2sat	source	String	Garcia & Gordon (1992) method
attribute	O2sat	standard_name	String	sea_water_sigma_theta
attribute	O2sat	units	String	kg m-3
variable	turbid		float
attribute	turbid	_FillValue	float	NaN
attribute	turbid	actual_range	float	0.1495, 91.624
attribute	turbid	long_name	String	Sea Water Turbidity
attribute	turbid	units	String	dimensionless NTU (Nephelometric Turbidity Units)
variable	sigma0		float
attribute	sigma0	_FillValue	float	NaN
attribute	sigma0	actual_range	float	-2.981261, 26.26271
attribute	sigma0	long_name	String	Sigma0
variable	H		float
attribute	H	_FillValue	float	NaN
attribute	H	actual_range	float	4.7, 54.0
attribute	H	long_name	String	H

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.