ERDDAP > info > EUREC4A_ATOMIC_RonBrown_PMEL_CN_O3_v1

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
	set	data	graph			PMEL Atmospheric Chemistry ATOMIC CN_O3 1 minute data		F   I   M	background			NOAA PMEL Atmosph...	EUREC4A_ATOMIC_RonBrown_PMEL_CN_O3_v1

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	_NCProperties	String	version=2,netcdf=4.7.4,hdf5=1.10.6
attribute	NC_GLOBAL	cdm_data_type	String	Trajectory
attribute	NC_GLOBAL	cdm_trajectory_variables	String	trajectory_id
attribute	NC_GLOBAL	comment	String	Unless otherwise noted, ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002]. The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air of in the controlled range of 55 to 60 %RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.
attribute	NC_GLOBAL	contributor_name	String	Coffman, Derek;Johnson, James;Quinn, Patricia;Bates, Tim;Upchurch, Lucia
attribute	NC_GLOBAL	Conventions	String	CF-1.6, COARDS, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	james.e.johnson at noaa.gov
attribute	NC_GLOBAL	creator_name	String	Johnson, James
attribute	NC_GLOBAL	creator_url	String	https://saga.pmel.noaa.gov
attribute	NC_GLOBAL	date_created	String	2020-11-30T17:20:26Z
attribute	NC_GLOBAL	Easternmost_Easting	double	-50.9246
attribute	NC_GLOBAL	featureType	String	Trajectory
attribute	NC_GLOBAL	geospatial_lat_max	double	15.8652
attribute	NC_GLOBAL	geospatial_lat_min	double	12.7865
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-50.9246
attribute	NC_GLOBAL	geospatial_lon_min	double	-59.6588
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	history	String	file created by NOAA/PMEL/ACG
attribute	NC_GLOBAL	infoUrl	String	https://saga.pmel.noaa.gov
attribute	NC_GLOBAL	institution	String	NOAA PMEL Atmospheric Chemistry
attribute	NC_GLOBAL	keywords	String	aerosol, air, atmosphere, atmospheric, atomic, chemistry, compounds, concentration, contaminants, data, earth, Earth Science > Atmosphere > Air Quality > Tropospheric Ozone, Earth Science > Atmosphere > Atmospheric Chemistry > Oxygen Compounds, Earth Science > Atmosphere > Atmospheric Chemistry > Oxygen Compounds > Ozone, environmental, fraction, identifier, laboratory, latitude, longitude, marine, minute, mixing, mole, mole_fraction_of_ozone_in_air, noaa, number, number_concentration_of_aerosol_particles_at_stp_in_air, O2, oxygen, ozone, pacific, particles, pmel, quality, ratio, science, statistics, stp, time, trajectory, trajectory_id, tropospheric, ufcn, ultrafine
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	15.8652
attribute	NC_GLOBAL	platform	String	RHBrown
attribute	NC_GLOBAL	product_version	String	1
attribute	NC_GLOBAL	project	String	ATOMIC
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	12.7865
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	subsetVariables	String	trajectory_id
attribute	NC_GLOBAL	summary	String	ATOMIC (Atlantic Tradewind Ocean Atmosphere Mesoscale Interaction Campaign) 2020 Field campaign: Surface meteorological and ship navigation collected from the RV Ronald H. Brown by the National Oceanic and Atmospheric Administration (NOAA) Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group in the tropical North Atlantic ocean from 2020-01-09 to 2020-02-13
attribute	NC_GLOBAL	time_coverage_end	String	2020-02-11T23:59:00Z
attribute	NC_GLOBAL	time_coverage_start	String	2020-01-07T18:00:00Z
attribute	NC_GLOBAL	title	String	PMEL Atmospheric Chemistry ATOMIC CN_O3 1 minute data
attribute	NC_GLOBAL	Westernmost_Easting	double	-59.6588
attribute	NC_GLOBAL	Westernnmost_Easting	double	-59.6588
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.57842E9, 1.58146554E9
attribute	time	axis	String	T
attribute	time	calendar	String	gregorian
attribute	time	colorBarMaximum	double	1.582E9
attribute	time	colorBarMinimum	double	1.578E9
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	trajectory_id		String
attribute	trajectory_id	cf_role	String	trajectory_id
attribute	trajectory_id	ioos_category	String	Identifier
attribute	trajectory_id	long_name	String	trajectory id
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	-1.0E34
attribute	latitude	actual_range	double	12.7865, 15.8652
attribute	latitude	axis	String	Y
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	comment	String	In the one minute files the position is treated somewhat differently from all the other data. The position given is the ship's position at the start of the one minute 'averaging' period. All other data are a true average. The PMEL GPS was the primary source. The Ship's GPS was used when there were missing data in the PMEL record
attribute	latitude	epic_code	String	500
attribute	latitude	instrument	String	GPS
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	90.0
attribute	latitude	valid_min	double	-90.0
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	_FillValue	double	-1.0E34
attribute	longitude	actual_range	double	-59.6588, -50.9246
attribute	longitude	axis	String	X
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	comment	String	In the one minute files the position is treated somewhat differently from all the other data. The position given is the ship's position at the start of the one minute 'averaging' period. All other data are a true average. The PMEL GPS was the primary source. The Ship's GPS was used when there were missing data in the PMEL record
attribute	longitude	epic_code	String	502
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	180.0
attribute	longitude	valid_min	double	-180.0
variable	ozone		double
attribute	ozone	_FillValue	double	-1.0E34
attribute	ozone	actual_range	double	12.119, 46.984
attribute	ozone	colorBarMaximum	double	1.0
attribute	ozone	colorBarMinimum	double	0.0
attribute	ozone	comment	String	Air was pulled from 16 m above sea level through a 1/4 inch teflon line at approximately 1 liter min-1 into a Thermo Environmental Instruments Model 49c ozone analyzer. The air inlet was approximately 2 meters below the aerosol inlet. During periods when the relative wind was behind the beam, there were obvious periods when ship exhaust was reacting with ozone, resulting in sudden spikes of low ozone. These spikes of low ozone have been edited out. The data are reported as one minute averages in units of ppb.
attribute	ozone	epic_code	String	1807
attribute	ozone	instrument	String	Thermo Environmental Instruments ozone analyzer ( Model 49c, sn: 0519412239 )
attribute	ozone	ioos_category	String	Contaminants
attribute	ozone	long_name	String	Ozone Mixing Ratio
attribute	ozone	missing_value	double	-999.0
attribute	ozone	source	String	surface observation
attribute	ozone	standard_name	String	mole_fraction_of_ozone_in_air
attribute	ozone	units	String	ppb
attribute	ozone	valid_max	double	250.0
attribute	ozone	valid_min	double	0.0
variable	cn		double
attribute	cn	_FillValue	double	-1.0E34
attribute	cn	actual_range	double	76.1667, 35002.9
attribute	cn	colorBarMaximum	double	100.0
attribute	cn	colorBarMinimum	double	0.0
attribute	cn	comment	String	One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to TSI 3010 (CN_Direct), a Brechtel aMCPC (CN_Stack) and TSI 3025A (UFCN_Direct) particle counters. Another one of the tubes was used to supply ambient air to TSI3785 (UFCN_Chem) and Aerosol Devices MAGIC210 (CN_MART) particle counters. The 3010, aMCPC, 3025, 3785 and MAGIC210 measure all particles larger than roughly 12, 5, 3, 5 and 5 nm respectively. The total particle counts from each instrument were recorded each second. The data were filtered to eliminate periods of calibration and instrument malfunction and zero air periods, and periods of obvious ship contamination from the R/V Brown (based on relative wind and high CN counts). The "best" filtered values were chosen to represent CN>12 (CN) and ultra-fine (UFCN) particle concentrations. The best CN values are primarily from CN_Direct with data from CN_Stack used to fill in periods where the CN_Direct data were not available. Similarly, the UFCN values are primarily from UFCN_Direct with the UFCN_Chem and CN_MART data used to fill in periods where UFCN_Direct data were not available. These "best" data were averaged into one minute periods. One second data are available upon request.
attribute	cn	epic_code	String	1853
attribute	cn	instrument	String	TSI 3010 (sn: 2251); Brechtel aMCPC (sn: 013); Aerosol Devices MAGIC210 (sn: 210-071)
attribute	cn	ioos_category	String	Statistics
attribute	cn	long_name	String	Number Concentration of Particles
attribute	cn	missing_value	double	-999.0
attribute	cn	source	String	surface observation
attribute	cn	standard_name	String	number_concentration_of_aerosol_particles_at_stp_in_air
attribute	cn	units	String	cm-3
attribute	cn	valid_max	double	50000.0
attribute	cn	valid_min	double	0.0
variable	ufcn		double
attribute	ufcn	_FillValue	double	-1.0E34
attribute	ufcn	actual_range	double	76.3347, 75773.5
attribute	ufcn	colorBarMaximum	double	100.0
attribute	ufcn	colorBarMinimum	double	0.0
attribute	ufcn	comment	String	One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to TSI 3010 (CN_Direct), a Brechtel aMCPC (CN_Stack) and TSI 3025A (UFCN_Direct) particle counters. Another one of the tubes was used to supply ambient air to TSI3785 (UFCN_Chem) and Aerosol Devices MAGIC210 (CN_MART) particle counters. The 3010, aMCPC, 3025, 3785 and MAGIC210 measure all particles larger than roughly 12, 5, 3, 5 and 5 nm respectively. The total particle counts from each instrument were recorded each second. The data were filtered to eliminate periods of calibration and instrument malfunction and zero air periods, and periods of obvious ship contamination from the R/V Brown (based on relative wind and high CN counts). The "best" filtered values were chosen to represent CN>12 (CN) and ultra-fine (UFCN) particle concentrations. The best CN values are primarily from CN_Direct with data from CN_Stack used to fill in periods where the CN_Direct data were not available. Similarly, the UFCN values are primarily from UFCN_Direct with the UFCN_Chem and CN_MART data used to fill in periods where UFCN_Direct data were not available. These "best" data were averaged into one minute periods. One second data are available upon request.
attribute	ufcn	epic_code	String	1852
attribute	ufcn	instrument	String	TSI 3025A (sn: 1110); TSI 3785 (sn: 70613009)
attribute	ufcn	ioos_category	String	Statistics
attribute	ufcn	long_name	String	Number Concentration of Ultrafine Particles
attribute	ufcn	missing_value	double	-999.0
attribute	ufcn	source	String	surface observation
attribute	ufcn	standard_name	String	number_concentration_of_aerosol_particles_at_stp_in_air
attribute	ufcn	units	String	cm-3
attribute	ufcn	valid_max	double	50000.0
attribute	ufcn	valid_min	double	0.0

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.