ERDDAP > info > bcodmo_dataset_750862

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
	set	data	graph		files	public	[EN589 Marine Aerosol Generator Operating Conditions] - Configuration and Operation of Marine Aerosol Generator Deployed on R/V Endeavor EN589 during Sept.- Oct. 2016 (Collaborative Research: Coupled Ocean-Atmosphere Recycling of Refractory Dissolved Organic Carbon in Seawater)		I   M	background			BCO-DMO	bcodmo_dataset_750862

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
attribute	NC_GLOBAL	acquisition_description	String	The marine aerosol generator was operated by William Keene ([wck@virginia.edu](\\"mailto:wck@virginia.edu\\")) and John Maben. Please direct any related questions to William Keene. Description and Operation of the Marine Aerosol Generator:\u00a0Model primary marine aerosol (mPMA) was produced in a high-capacity generator fabricated from Pyrex and Teflon.\u00a0 See Keene et al. [2007] for a description and schematic of the original configuration of the device and Long et al. [2014] for an explanation of modifications implemented for deployment on ships at sea during the 2010 California Nexis (CalNex) campaign in the eastern North Pacific Ocean and the 2012 Western Atlantic Climate Study (WACS) in the western North Atlantic Ocean.\u00a0 During all previous deployments, bubble plumes were produced using sintered-glass frits and/or plunging seawater jets.\u00a0 During the Endeavor cruise, frits were replaced with force-air Venturis as described below.\u00a0 Briefly, the 20-cm-diameter generator consisted of a 122-cm-deep seawater reservoir underlying a 97-cm-deep atmosphere. During most periods, fresh seawater drawn from approximately 5-m depth through the ship\u2019s clean seawater line flowed into the base of the seawater reservoir (typically at 4 L min-1) and drained evenly to exhaust over the top annular rim thereby continuously replacing the seawater surface and minimizing formation of standing bubble rafts.\u00a0 During two periods, feed seawater flowing through the generator was transferred from carboys containing seawater that had been collected at a depth of 2500 m, stored in 20 L Teflon lined carboys, and warmed to room temperature.\u00a0 Bubble plumes were generated by two mechanisms. (1) Ultra-pure air and seawater (drawn from the base of the generator\u2019s seawater reservoir) were pumped at adjustable rates of 1 to 5 L min-1 each through one of two force-air Venturi nozzles that were fabricated from Teflon and positioned at depths of 42 (shallow) and 72 cm (deep), respectively, below the air-seawater interface.\u00a0 (2) Bubble plumes were also produced by a seawater jet at flow rates of 1 to 3 L min-1 that impinged on the air-seawater interface.\u00a0 The jet nozzle was 0.32-cm ID and positioned at 50 cm above the interface. mPMA was emitted to the headspace when bubbles rose to and burst at the air- seawater interface. Ultra-pure sweep air flowed through the headspace above the seawater reservoir at 70 L min-1. During most sampling periods, sweep air was hydrated to a relative humidity (RH) of ~80%. mPMA was sampled for chemical and physical characterization through isokinetic ports at the top of the generator. The generator was blank tested by measuring mPMA number concentrations in the headspace at typical flow rates of bubble and sweep air but with no seawater in the reservoir. All blank tests yielded undetectable particle number concentrations (less than 2 cm-3) indicating that all particles measured during routine operation originated from seawater. Bubble-plume void fractions were quantified over ranges of conditions by filling the generator, turning off the flow of feed seawater, incrementally increasing the flow of air through the Venturi, and measuring the volume of displaced water. Refer to the elated papers below for additional details regarding the design and operation of the marine aerosol generator and associated analytical methods.
attribute	NC_GLOBAL	awards_0_award_nid	String	708309
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1536608
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1536608
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	awards_0_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51517
attribute	NC_GLOBAL	awards_1_award_nid	String	708317
attribute	NC_GLOBAL	awards_1_award_number	String	OCE-1536605
attribute	NC_GLOBAL	awards_1_data_url	String	https://www.nsf.gov/awardsearch/showAward?AWD_ID=1536605
attribute	NC_GLOBAL	awards_1_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_1_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_1_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_1_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_1_program_manager_nid	String	51517
attribute	NC_GLOBAL	awards_2_award_nid	String	708320
attribute	NC_GLOBAL	awards_2_award_number	String	OCE-1536674
attribute	NC_GLOBAL	awards_2_data_url	String	https://www.nsf.gov/awardsearch/showAward?AWD_ID=1536674
attribute	NC_GLOBAL	awards_2_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_2_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_2_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_2_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_2_program_manager_nid	String	51517
attribute	NC_GLOBAL	awards_3_award_nid	String	708323
attribute	NC_GLOBAL	awards_3_award_number	String	OCE-1536597
attribute	NC_GLOBAL	awards_3_data_url	String	https://www.nsf.gov/awardsearch/showAward?AWD_ID=1536597
attribute	NC_GLOBAL	awards_3_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_3_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_3_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_3_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_3_program_manager_nid	String	51517
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	EN589: Marine Aerosol Generator Operating Conditions PI: W. Keene (UVA) version: 2018-12-03
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/
attribute	NC_GLOBAL	data_source	String	extract_data_as_tsv version 2.3 19 Dec 2019
attribute	NC_GLOBAL	date_created	String	2018-12-05T15:37:57Z
attribute	NC_GLOBAL	date_modified	String	2019-03-18T13:46:27Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.750862.1
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/750862
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	Flow Meter
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	Airflow rates were regulated with needle valves and quantified with Teledyne Hastings mass flowmeters. Seawater flow rates were measured at the exhaust. RH and temperature were measured continuously at the outlet with a Vasala model HMP 233 probe and meter.
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	750916
attribute	NC_GLOBAL	instruments_0_description	String	General term for a sensor that quantifies the rate at which fluids (e.g. water or air) pass through sensor packages, instruments, or sampling devices. A flow meter may be mechanical, optical, electromagnetic, etc.
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/388/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Flow Meter
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	650
attribute	NC_GLOBAL	instruments_0_supplied_name	String	Teledyne Hastings mass flowmeters and Vasala model HMP 233 probe and meter.
attribute	NC_GLOBAL	keywords	String	air, bco, bco-dmo, biological, bubble, chemical, data, dataset, date, depth, dmo, end, End_Date_local, End_time_local, erddap, flowrate, generator, Generator_Seawater_flowrate, humidity, ID_Number, jet, Jet_Flowrate, local, management, number, oceanography, office, plumes, plumes_Venturi, preliminary, rate, rel, Rel_Humidity, sample, Sample_Type, sea, seawater, start, Start_Time_local, sweep, Sweep_Bubble_Air_rate, time, type, venturi, Venturi_Air_flowrate, Venturi_Seawater_flowrate, water, water_depth_type
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/750862/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/750862
attribute	NC_GLOBAL	param_mapping	String	{'750862': {}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/750862/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of Virginia
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	UVA
attribute	NC_GLOBAL	people_0_person_name	String	William C. Keene
attribute	NC_GLOBAL	people_0_person_nid	String	708330
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	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_1_person_name	String	Nancy Copley
attribute	NC_GLOBAL	people_1_person_nid	String	50396
attribute	NC_GLOBAL	people_1_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_1_role_type	String	related
attribute	NC_GLOBAL	project	String	Refractory DOC Recycling
attribute	NC_GLOBAL	projects_0_acronym	String	Refractory DOC Recycling
attribute	NC_GLOBAL	projects_0_description	String	The oceans hold a massive quantity of organic carbon that is greater than all terrestrial organic carbon biomass combined. Nearly all marine organic carbon is dissolved and more than 95% is refractory, and cycled through the oceans several times before complete removal. Refractory dissolved organic carbon (RDOC) concentrations are uniform with depth in the water column and represent the "background" carbon present throughout the oceans. However, very little is known regarding RDOC production and removal processes. One potential removal pathway is through adsorption of RDOC onto surfaces of rising bubbles produced by breaking waves and ejection via bubble bursting into the atmosphere. Building on prior research, the investigators will evaluate the importance of ocean- atmosphere processing in recycling marine RDOC during a research cruise in the northwestern Atlantic Ocean. Results of the research will provide important insights regarding the coupled ocean-atmosphere loss of RDOC, thereby improving understanding of and ability to predict the role of RDOC in oceanic and atmospheric biogeochemistry, the global carbon cycle, and Earth's climate. The research will involve three early career faculty, and will provide training for undergraduate and graduate researchers. Recent results based on a limited set of observations indicate that the organic matter (OM) associated with primary marine aerosol (PMA) produced by bursting bubbles from breaking waves at the sea surface is comprised partly to wholly of RDOC rather than OM of recent biological origin as has been widely assumed. The injection of RDOC into the atmosphere in association with PMA and its subsequent photochemical oxidation is a potentially important and hitherto unrecognized sink for RDOC in the oceans of sufficient magnitude to close the marine carbon budget and help resolve a long-standing conundrum regarding removal mechanisms for marine RDOC. This project will involve a shipboard investigation and modeling study to (1) quantify the relative contributions of marine refractory dissolved organic carbon (RDOC) to primary marine aerosol organic matter (PMA OM) produced from near-surface seawater in biologically productive and oligotrophic regions and from North Atlantic Deep Water, and to (2) determine the importance of atmospheric photochemical processing as a recycling pathway for RDOC. To test these hypotheses, a high-capacity aerosol generator will be deployed at four hydrographic stations in the NW Atlantic Ocean to characterize (1) the natural abundance of 14C in PMA and in surface and deep seawater; (2) the surface tension and physical properties of bubble plumes; (3) size-resolved production fluxes, chemical composition, organic carbon enrichments, spectral absorbance, and photochemical evolution of PMA; and (4) the carbon content, optical properties, and physical properties of seawater. The importance of RDOC recycling via PMA production and photochemical evolution will be interpreted with model calculations. EN589 Cruise Track
attribute	NC_GLOBAL	projects_0_end_date	String	2018-12
attribute	NC_GLOBAL	projects_0_geolocation	String	Northwest Atlantic Ocean
attribute	NC_GLOBAL	projects_0_name	String	Collaborative Research: Coupled Ocean-Atmosphere Recycling of Refractory Dissolved Organic Carbon in Seawater
attribute	NC_GLOBAL	projects_0_project_nid	String	708310
attribute	NC_GLOBAL	projects_0_start_date	String	2015-09
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	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	subsetVariables	String	Sweep_Bubble_Air_rate
attribute	NC_GLOBAL	summary	String	This dataset describes the operating conditions for the high-capacity generator that produced primary marine aerosol from western North Atlantic seawater during cruise EN589 on RV/Endeavor during September and October 2016.
attribute	NC_GLOBAL	title	String	[EN589 Marine Aerosol Generator Operating Conditions] - Configuration and Operation of Marine Aerosol Generator Deployed on R/V Endeavor EN589 during Sept.- Oct. 2016 (Collaborative Research: Coupled Ocean-Atmosphere Recycling of Refractory Dissolved Organic Carbon in Seawater)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	ID_Number		short
attribute	ID_Number	_FillValue	short	32767
attribute	ID_Number	actual_range	short	2, 323
attribute	ID_Number	bcodmo_name	String	sample
attribute	ID_Number	colorBarMaximum	double	100.0
attribute	ID_Number	colorBarMinimum	double	0.0
attribute	ID_Number	description	String	Sequential ID number indicting an individual period during which performance and/or mPMA properties were characterized with the generator operated in the same configuration.
attribute	ID_Number	long_name	String	ID Number
attribute	ID_Number	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P02/current/ACYC/
attribute	ID_Number	units	String	unitless
variable	Sample_Type		String
attribute	Sample_Type	bcodmo_name	String	sample_type
attribute	Sample_Type	description	String	Type of measurement and/or sample: T (Performance test) = Physical characterization only; S = Physical characterization + seawater grab sample for chemical characterization; CI = Physical characterization + cascade impactor sample or blank for analysis of major ions and organic carbon (OC); B = Physical characterization + bulk sample or blank for analysis of major ions and OC or for photochemical manipulation experiments
attribute	Sample_Type	long_name	String	Sample Type
attribute	Sample_Type	units	String	unitless
variable	Start_Date_local		String
attribute	Start_Date_local	bcodmo_name	String	date_start
attribute	Start_Date_local	description	String	For T period: start date for the first 5-minute measurement interval for the sizing instruments (scanning mobility particle sizer and aerodynamic particle sizer) or measurement date for water displacement characterization. Other periods (S, CI, B): Start date for mPMA sample or date for mPMA blank or seawater grab sample. Formatted as yyyy-mm-dd.
attribute	Start_Date_local	long_name	String	Start Date Local
attribute	Start_Date_local	source_name	String	Start_Date_local
attribute	Start_Date_local	time_precision	String	1970-01-01
attribute	Start_Date_local	units	String	unitless
variable	Start_Time_local		String
attribute	Start_Time_local	bcodmo_name	String	time_start
attribute	Start_Time_local	description	String	For T period: start time (Atlantic Daylight Time - ADT) for the first 5-minute measurement interval for the sizing instruments (scanning mobility particle sizer and aerodynamic particle sizer) or measurement time for water displacement characterization. Other periods (S, CI, B): Start time for mPMA sample or time for mPMA blank or seawater grab sample. Note: Times for many void fraction measurements were not recorded.
attribute	Start_Time_local	long_name	String	Start Time Local
attribute	Start_Time_local	units	String	unitless
variable	End_Date_local		String
attribute	End_Date_local	bcodmo_name	String	date_end
attribute	End_Date_local	description	String	For T period: stop datefor the last 5-minute measurement interval for the sizing instruments. Other periods: Stop date for mPMA sample. Formatted as yyyy-mm-dd.
attribute	End_Date_local	long_name	String	End Date Local
attribute	End_Date_local	units	String	unitless
variable	End_time_local		String
attribute	End_time_local	bcodmo_name	String	time_end
attribute	End_time_local	description	String	For T period: stop time (Atlantic Daylight Time - ADT) for the last 5-minute measurement interval for the sizing instruments. Other periods: Stop time for mPMA sample.
attribute	End_time_local	long_name	String	End Time Local
attribute	End_time_local	units	String	unitless
variable	water_depth_type		String
attribute	water_depth_type	bcodmo_name	String	unknown
attribute	water_depth_type	description	String	Depth from which feed seawater was drawn: NS = near-surface (~5 m); NADW = North Atlantic deep water (~2500 m). The 2500 m seawater was transferred from a CTD to 20 L HDPE Teflon-lined carboys, warmed to room temperature, and pneumatically transferred from the carboys to the generator.
attribute	water_depth_type	long_name	String	Water Depth Type
attribute	water_depth_type	units	String	unitless
variable	Generator_Seawater_flowrate		float
attribute	Generator_Seawater_flowrate	_FillValue	float	NaN
attribute	Generator_Seawater_flowrate	actual_range	float	0.0, 4.0
attribute	Generator_Seawater_flowrate	bcodmo_name	String	flow_rate
attribute	Generator_Seawater_flowrate	description	String	Flow rate of feed seawater into base of generator
attribute	Generator_Seawater_flowrate	long_name	String	Generator Seawater Flowrate
attribute	Generator_Seawater_flowrate	units	String	liters/minute
variable	Jet_Flowrate		float
attribute	Jet_Flowrate	_FillValue	float	NaN
attribute	Jet_Flowrate	actual_range	float	0.0, 2.9
attribute	Jet_Flowrate	bcodmo_name	String	flow_rate
attribute	Jet_Flowrate	description	String	Flow rate of seawater though jet
attribute	Jet_Flowrate	long_name	String	Jet Flowrate
attribute	Jet_Flowrate	units	String	liters/minute
variable	Sweep_Bubble_Air_rate		byte
attribute	Sweep_Bubble_Air_rate	_FillValue	byte	127
attribute	Sweep_Bubble_Air_rate	actual_range	byte	70, 70
attribute	Sweep_Bubble_Air_rate	bcodmo_name	String	flow_rate
attribute	Sweep_Bubble_Air_rate	description	String	Total flow rate of air through generator (sweep + bubble air)
attribute	Sweep_Bubble_Air_rate	long_name	String	Sweep Bubble Air Rate
attribute	Sweep_Bubble_Air_rate	units	String	liters/minute
variable	plumes_Venturi		String
attribute	plumes_Venturi	bcodmo_name	String	unknown
attribute	plumes_Venturi	description	String	Plumes produced by shallow (S) or deep (D) Venturi. Note: Immediately preceding the final two observation periods, seawater flow into the generator was turned off and the seawater level in the reservoir was lowered to approximately 4 cm above the top of the shallow Venturi (designated as S*).
attribute	plumes_Venturi	long_name	String	Plumes Venturi
attribute	plumes_Venturi	units	String	unitless
variable	Venturi_Air_flowrate		float
attribute	Venturi_Air_flowrate	_FillValue	float	NaN
attribute	Venturi_Air_flowrate	actual_range	float	0.0, 5.0
attribute	Venturi_Air_flowrate	bcodmo_name	String	flow_rate
attribute	Venturi_Air_flowrate	description	String	Flow rate of bubble air through Venturi
attribute	Venturi_Air_flowrate	long_name	String	Venturi Air Flowrate
attribute	Venturi_Air_flowrate	units	String	liters/minute
variable	Venturi_Seawater_flowrate		float
attribute	Venturi_Seawater_flowrate	_FillValue	float	NaN
attribute	Venturi_Seawater_flowrate	actual_range	float	0.0, 5.0
attribute	Venturi_Seawater_flowrate	bcodmo_name	String	flow_rate
attribute	Venturi_Seawater_flowrate	description	String	Flow rate of seawater through Venturi
attribute	Venturi_Seawater_flowrate	long_name	String	Venturi Seawater Flowrate
attribute	Venturi_Seawater_flowrate	units	String	liters/minute
variable	Rel_Humidity		float
attribute	Rel_Humidity	_FillValue	float	NaN
attribute	Rel_Humidity	actual_range	float	63.6, 86.0
attribute	Rel_Humidity	bcodmo_name	String	humidity
attribute	Rel_Humidity	description	String	Average RH of air in generator’s head space (%)
attribute	Rel_Humidity	long_name	String	Rel Humidity
attribute	Rel_Humidity	units	String	unitless

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.