ERDDAP > info > ACG_WACS-2_Knorr_ccn

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 WACS-2 CCN data		F   I   M	background			NOAA	ACG_WACS-2_Knorr_ccn

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	CCN Measurements: A Droplet Measurement Technologies CCN Counter (DMT CCNC) was used to determine CCN concentrations of sub-1 um particles at supersaturations ranging from 0.1 to 0.62%. A multijet cascade impactor with a 50% aerodynamic cut-off diameter of 1.1 um was upstream of the CCNC. The sampled air was dried prior to reaching the CCNC. Details concerning the characteristics of the DMT CCN counter can be found in Roberts and Nenes [2005] and Lance et al. [2006]. The CCN counter was calibrated before and during the experiment as outlined by Lance et al. [2006]. The uncertainty associated with the CCN number concentration is estimated to be less than +/- 10% [Roberts and Nenes, 2005]. Uncertainty in the instrumental supersaturation is less than +/- 10% for the operating conditions of this experiment [Roberts and Nenes, 2005]. The data are in 10 second time intervals and include CCN concentration (in n/cm^3), CCN/CN ratio, and Supersaturation (in %). Lance, S., J. Medina, J.N. Smith, and A. Nenes, Mapping the operation of the DMT continuous flow CCN counter, Aer. Sci. Tech., 40, 242 - 254, 2006. Roberts, G.C. and A. Nenes, A continuous-flow streamwise thermal gradient CCN chamber for atmospheric measurements, Aer. Sci. Tech., 39, 206 - 221, 2005.
attribute	NC_GLOBAL	contributor_name	String	Coffman, Derek/NOAA-PMEL/Address: 7600 Sand Pt. Wy. NE,Seattle,WA 98115 /email: derek.coffman@noaa.gov
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=126001
attribute	NC_GLOBAL	Easternmost_Easting	double	-60.59
attribute	NC_GLOBAL	featureType	String	Trajectory
attribute	NC_GLOBAL	geospatial_lat_max	double	42.4999
attribute	NC_GLOBAL	geospatial_lat_min	double	33.1884
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-60.59
attribute	NC_GLOBAL	geospatial_lon_min	double	-70.8943
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, altitude, atmosphere, atmospheric, ccn, ccn_cn_ratio, ccn_ss, chemistry, chla, chlorophyll, chlorophyll-a, cloud, cloud cover, cloudiness, commerce, concentration, condensation, cover, data, datetime, department, doc, duration, earth, Earth Science > Atmosphere > Altitude > Station Height, environmental, height, identifier, laboratory, latitude, level, longitude, marine, mean, measurement, meteorology, noaa, nuclei, pacific, pmel, ratio, science, sea, station, supersaturation, time, trajectory, trajectory_id, wacs, wacs-2
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	42.4999
attribute	NC_GLOBAL	platform	String	Knorr
attribute	NC_GLOBAL	product_version	String	0
attribute	NC_GLOBAL	project	String	WACS-2
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	33.1884
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v70
attribute	NC_GLOBAL	subsetVariables	String	trajectory_id, duration, altitude
attribute	NC_GLOBAL	summary	String	Core WACS 2014 Objectives 1. Characterization of freshly emitted SSA. Freshly emitted SSA will be generated with NOAA Pacific Marine Environmental Laboratory's (PMEL) Sea Sweep particle generator. Sea Sweep allows for the generation and sampling of nascent particles without contamination and modification by existing atmospheric particles and gases (Bates et al., J. Geophys. Res., 2012). Properties of the particles to be characterized include chemical composition, size distribution, number concentration, cloud-nucleating ability, light scattering as a function of relative humidity, and light absorption. 2. Characterization of surface and column seawater properties. Surface seawater properties to be measured include fluorescence (chlorophyll-a), particulate organic carbon (POC), dissolved organic carbon (Department of Commerce (DOC)), dimethylsulfide (DMS), temperature, salinity, bubble surface tension, exopolymer gels, phytoplankton species composition, and nutrients. 3. Assessment of the impact of surface seawater properties on SSA. The response of nascent SSA properties (composition, size distribution, cloud-nucleating ability) to changes in ocean biological regime will be determined.
attribute	NC_GLOBAL	target_sample_rh	String	47-55%
attribute	NC_GLOBAL	time_coverage_end	String	2014-06-04T12:00:00Z
attribute	NC_GLOBAL	time_coverage_start	String	2014-05-20T22:00:00Z
attribute	NC_GLOBAL	title	String	PMEL Atmospheric Chemistry WACS-2 CCN data
attribute	NC_GLOBAL	Westernmost_Easting	double	-70.8943
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.4006232E9, 1.4018832E9
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	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	duration		int
attribute	duration	_FillValue	int	2147483647
attribute	duration	actual_range	int	600, 600
attribute	duration	coords	String	time
attribute	duration	ioos_category	String	Time
attribute	duration	long_name	String	Duration
attribute	duration	units	String	second
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	actual_range	double	33.1884, 42.4999
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	-70.8943, -60.59
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	ccn_ss		double
attribute	ccn_ss	_FillValue	double	NaN
attribute	ccn_ss	actual_range	double	0.1, 2.0
attribute	ccn_ss	colorBarMaximum	double	100.0
attribute	ccn_ss	colorBarMinimum	double	0.0
attribute	ccn_ss	coords	String	time
attribute	ccn_ss	instrument	String	Cloud Condensation Nuclei Counter
attribute	ccn_ss	ioos_category	String	Unknown
attribute	ccn_ss	long_name	String	Supersaturation of CCN measurement
attribute	ccn_ss	source	String	surface observation
attribute	ccn_ss	units	String	percent
variable	ccn		double
attribute	ccn	_FillValue	double	NaN
attribute	ccn	actual_range	double	3.422, 1893.04
attribute	ccn	colorBarMaximum	double	60000.0
attribute	ccn	colorBarMinimum	double	0.0
attribute	ccn	coords	String	time
attribute	ccn	instrument	String	Cloud Condensation Nuclei Counter
attribute	ccn	ioos_category	String	Meteorology
attribute	ccn	long_name	String	Cloud Condensation Nuclei Concentration at ccn_ss
attribute	ccn	source	String	surface observation
attribute	ccn	units	String	cm-3
attribute	ccn	valid_max	double	50000.0
attribute	ccn	valid_min	double	0.0
variable	ccn_cn_ratio		double
attribute	ccn_cn_ratio	_FillValue	double	NaN
attribute	ccn_cn_ratio	actual_range	double	0.00642298, 1.04705
attribute	ccn_cn_ratio	colorBarMaximum	double	1.5
attribute	ccn_cn_ratio	colorBarMinimum	double	0.0
attribute	ccn_cn_ratio	coords	String	time
attribute	ccn_cn_ratio	instrument	String	Cloud Condensation Nuclei Counter
attribute	ccn_cn_ratio	ioos_category	String	Unknown
attribute	ccn_cn_ratio	long_name	String	Ratio of CCN to CN
attribute	ccn_cn_ratio	source	String	surface observation
attribute	ccn_cn_ratio	valid_max	double	1.0
attribute	ccn_cn_ratio	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.