ERDDAP > info > ACG_NAAMES-4_Atlantis_aerosol_sizedist_dmps

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		files	PMEL Atmospheric Chemistry NAAMES-4 Aerosol Size Distribution (DMPS) data		F   I   M	background			NOAA	ACG_NAAMES-4_Atlantis_aerosol_sizedist_dmps

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Trajectory
attribute	NC_GLOBAL	cdm_trajectory_variables	String	trajectory_id
attribute	NC_GLOBAL	comment	String	PMEL Size Distributions Aerosol inlet: 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 controlled to the indicated target sample 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. DMPS (datasets denoted by _aerosol_sizedist_dmps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration. APS (datasets denoted by _aerosol_sizedist_aps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration. Merged (datasets denoted by _aerosol_sizedist): These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where “phantom” counts resulted in a spurious coarse mode in the surface and volume distributions. All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume. Additional datasets may be included for a give project that include: - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3, NCCSV-1.0
attribute	NC_GLOBAL	creator_email	String	derek.coffman at noaa.gov
attribute	NC_GLOBAL	creator_name	String	Coffman, Derek
attribute	NC_GLOBAL	creator_url	String	https://www.pmel.noaa.gov/
attribute	NC_GLOBAL	dimensions	String	time=6331 diameter=16
attribute	NC_GLOBAL	Easternmost_Easting	double	-38.223732
attribute	NC_GLOBAL	featureType	String	Trajectory
attribute	NC_GLOBAL	geospatial_lat_max	double	44.656598
attribute	NC_GLOBAL	geospatial_lat_min	double	18.457217
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-38.223732
attribute	NC_GLOBAL	geospatial_lon_min	double	-66.143532
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	18.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	18.0
attribute	NC_GLOBAL	geospatial_vertical_positive	String	up
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	https://www.pmel.noaa.gov/acg/data/index.html
attribute	NC_GLOBAL	institution	String	NOAA
attribute	NC_GLOBAL	keywords	String	above, aerosol, altitude, area, atmosphere, atmospheric, bin, chemistry, data, datetime, diameter, distribution, dlogDp, dmps, dNdlogDp, dSdlogDp, duration, dVdlogDp, earth, Earth Science > Atmosphere > Altitude > Station Height, environmental, height, identifier, laboratory, latitude, level, log, log-normal, longitude, marine, mean, midpoint, naames, naames-4, noaa, normal, normalized, number, pacific, particle, pmel, science, sea, size, station, statistics, stokes, surface, time, trajectory, trajectory_id, volume, width
attribute	NC_GLOBAL	keywords_vocabulary	String	GCMD Science Keywords
attribute	NC_GLOBAL	license	String	These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0).
attribute	NC_GLOBAL	Northernmost_Northing	double	44.656598
attribute	NC_GLOBAL	platform	String	Atlantis
attribute	NC_GLOBAL	product_version	String	0
attribute	NC_GLOBAL	project	String	NAAMES-4
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	18.457217
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v70
attribute	NC_GLOBAL	subsetVariables	String	trajectory_id, altitude, duration
attribute	NC_GLOBAL	summary	String	Pacific Marine Environmental Laboratory (PMEL) Size Distributions Aerosol inlet: 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 controlled to the indicated target sample 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. DMPS (datasets denoted by _aerosol_sizedist_dmps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration. APS (datasets denoted by _aerosol_sizedist_aps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration. Merged (datasets denoted by _aerosol_sizedist): These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions. All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume. Additional datasets may be included for a give project that include: - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations
attribute	NC_GLOBAL	time_coverage_end	String	2018-04-11T12:30:00Z
attribute	NC_GLOBAL	time_coverage_start	String	2018-03-20T13:00:00Z
attribute	NC_GLOBAL	title	String	PMEL Atmospheric Chemistry NAAMES-4 Aerosol Size Distribution (DMPS) data
attribute	NC_GLOBAL	Westernmost_Easting	double	-66.143532
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.5215508E9, 1.5234498E9
attribute	time	axis	String	T
attribute	time	comment	String	Start of sampling period
attribute	time	coords	String	time
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	Datetime UTC
attribute	time	source_name	String	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	diameter		double
attribute	diameter	actual_range	double	0.02, 0.8
attribute	diameter	coords	String	diameter
attribute	diameter	ioos_category	String	Unknown
attribute	diameter	long_name	String	midpoint Diameter(Stokes)
attribute	diameter	units	String	micrometers
variable	trajectory_id		String
attribute	trajectory_id	cf_role	String	trajectory_id
attribute	trajectory_id	coords	String	time
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	actual_range	double	18.457217, 44.656598
attribute	latitude	axis	String	Y
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	coords	String	time
attribute	latitude	instrument	String	GPS
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	source	String	surface observation
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	actual_range	double	-66.143532, -38.223732
attribute	longitude	axis	String	X
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	coords	String	time
attribute	longitude	instrument	String	GPS
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	source	String	surface observation
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	altitude		double
attribute	altitude	_CoordinateAxisType	String	Height
attribute	altitude	_CoordinateZisPositive	String	up
attribute	altitude	actual_range	double	18.0, 18.0
attribute	altitude	axis	String	Z
attribute	altitude	colorBarMinimum	double	0.0
attribute	altitude	coords	String	time
attribute	altitude	ioos_category	String	Location
attribute	altitude	long_name	String	height above mean sea level
attribute	altitude	positive	String	up
attribute	altitude	standard_name	String	altitude
attribute	altitude	units	String	m
attribute	altitude	valid_min	double	0.0
variable	dNdlogDp		double
attribute	dNdlogDp	_FillValue	double	NaN
attribute	dNdlogDp	actual_range	double	0.0, 3982.969035
attribute	dNdlogDp	colorBarMaximum	double	100.0
attribute	dNdlogDp	colorBarMinimum	double	0.0
attribute	dNdlogDp	coords	String	time diameter
attribute	dNdlogDp	ioos_category	String	Statistics
attribute	dNdlogDp	long_name	String	Normalized particle number size distribution (Log-normal)
attribute	dNdlogDp	source	String	surface observation
attribute	dNdlogDp	units	String	micrometer-1 cm-3
attribute	dNdlogDp	valid_min	double	0.0
variable	dlogDp		double
attribute	dlogDp	actual_range	double	0.1066918094740335, 0.10688699240411685
attribute	dlogDp	coords	String	time diameter
attribute	dlogDp	ioos_category	String	Unknown
attribute	dlogDp	long_name	String	diameter bin width
attribute	dlogDp	source	String	surface observation
attribute	dlogDp	units	String	micrometer
variable	dN		double
attribute	dN	_FillValue	double	NaN
attribute	dN	actual_range	double	0.0, 425.66206941206866
attribute	dN	colorBarMaximum	double	100.0
attribute	dN	colorBarMinimum	double	0.0
attribute	dN	coords	String	time diameter
attribute	dN	ioos_category	String	Statistics
attribute	dN	long_name	String	Particle number size distribution
attribute	dN	source	String	surface observation
attribute	dN	units	String	cm-3
attribute	dN	valid_min	double	0.0
variable	dSdlogDp		double
attribute	dSdlogDp	_FillValue	double	NaN
attribute	dSdlogDp	actual_range	double	0.0, 135.85563977690904
attribute	dSdlogDp	colorBarMinimum	double	0.0
attribute	dSdlogDp	coords	String	time diameter
attribute	dSdlogDp	ioos_category	String	Unknown
attribute	dSdlogDp	long_name	String	Normalized particle surface area distribution (Log-normal)
attribute	dSdlogDp	source	String	surface observation
attribute	dSdlogDp	units	String	micrometer2 micrometer-1 cm-3
attribute	dSdlogDp	valid_min	double	0.0
variable	dS		double
attribute	dS	_FillValue	double	NaN
attribute	dS	actual_range	double	0.0, 14.494684035050907
attribute	dS	colorBarMinimum	double	0.0
attribute	dS	coords	String	time diameter
attribute	dS	ioos_category	String	Unknown
attribute	dS	long_name	String	Particle surface area size distribution
attribute	dS	source	String	surface observation
attribute	dS	units	String	micrometer2 cm-3
attribute	dS	valid_min	double	0.0
variable	dVdlogDp		double
attribute	dVdlogDp	_FillValue	double	NaN
attribute	dVdlogDp	actual_range	double	0.0, 5.199361679877036
attribute	dVdlogDp	colorBarMinimum	double	0.0
attribute	dVdlogDp	coords	String	time diameter
attribute	dVdlogDp	ioos_category	String	Unknown
attribute	dVdlogDp	long_name	String	Normalized Particle volume distribution (Log-normal)
attribute	dVdlogDp	source	String	surface observation
attribute	dVdlogDp	units	String	micrometer3 micrometer-1 cm-3
attribute	dVdlogDp	valid_min	double	0.0
variable	dV		double
attribute	dV	_FillValue	double	NaN
attribute	dV	actual_range	double	0.0, 0.5552988661894676
attribute	dV	colorBarMinimum	double	0.0
attribute	dV	coords	String	time diameter
attribute	dV	ioos_category	String	Unknown
attribute	dV	long_name	String	Particle volume size distribution
attribute	dV	source	String	surface observation
attribute	dV	units	String	micrometer3 cm-3
attribute	dV	valid_min	double	0.0
variable	duration		int
attribute	duration	_FillValue	int	2147483647
attribute	duration	actual_range	int	300, 300
attribute	duration	coords	String	time
attribute	duration	ioos_category	String	Time
attribute	duration	long_name	String	Duration
attribute	duration	units	String	second

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.