ERDDAP > info > bcodmo_dataset_986875_v1

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
		data	graph		files	public	[Water Column Methane Oxidation Gulf of Alaska] - Water column methane, methane oxidation, and pmoA gene copies above methane seeps determined from samples collected off the Aleutian Islands, Gulf of Alaska on R/V Atlantis cruise AT50-24 in May to June 2024 (Collaborative Research: Redefining the footprint of deep ocean methane seepage for benthic ecosystems)		F   I   M	background			BCO-DMO	bcodmo_dataset_986875_v1

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Other
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_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.26008/1912/bco-dmo.986875.1
attribute	NC_GLOBAL	Easternmost_Easting	double	-147.9998
attribute	NC_GLOBAL	geospatial_lat_max	double	57.4803
attribute	NC_GLOBAL	geospatial_lat_min	double	53.74744
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-147.9998
attribute	NC_GLOBAL	geospatial_lon_min	double	-162.5903
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	infoUrl	String	https://osprey.bco-dmo.org/dataset/986875
attribute	NC_GLOBAL	institution	String	BCO-DMO
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	57.4803
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	53.74744
attribute	NC_GLOBAL	summary	String	Cold seeps along the eastern Aleutian subduction zone in the Gulf of Alaska fuel benthic ecosystems through microbial methane (CH₄) consumption, yet the structure and controls of water column CH₄ oxidation in these deep, cold waters remain poorly resolved. During a May–June 2024 expedition with the R/V Atlantis and HOV Alvin, we studied CH₄ and its bacterial oxidation from surface to seafloor above three deep seep sites (2000 to 5000 meters): Edge, Shumagin, and Sanak, by combining radiotracer incubations with pmoA gene  profiling. CH₄ oxidation occurred throughout the water column, with peak rates (1 to 242 nanomoles per liter per day) in near-seafloor Alvin samples and 0.1 to 0.25 nanomoles per liter per day in CTD rosette samples 10 to 30 meters above bottom. Rates varied by site and depth. CH₄ oxidation in surface waters, coinciding with an algal bloom, suggests cryptic cycling via in situ production and consumption. A ~325-meter near-bottom CTD transect at Sanak revealed lateral gradients in CH₄ and oxidation aligned with bottom currents, with oxidation highest near hydrate-bearing gas vents and at the off-seep distal end. These findings show that aerobic CH₄ oxidation peaks near the seafloor to ~30 meters above but extends laterally and vertically beyond active seepage. Oxidation was detected even where methanotroph gene abundance was low, potentially indicating the influence of lateral CH₄ transport and tidal currents. The methanosphere thus emerges as a dynamic and spatially diffuse microbial system shaped by CH₄ availability and physical transport processes.
attribute	NC_GLOBAL	time_coverage_end	String	2024-06-05T21:55:00Z
attribute	NC_GLOBAL	time_coverage_start	String	2024-05-17T05:12:00Z
attribute	NC_GLOBAL	title	String	[Water Column Methane Oxidation Gulf of Alaska] - Water column methane, methane oxidation, and pmoA gene copies above methane seeps determined from samples collected off the Aleutian Islands, Gulf of Alaska on R/V Atlantis cruise AT50-24 in May to June 2024 (Collaborative Research: Redefining the footprint of deep ocean methane seepage for benthic ecosystems)
attribute	NC_GLOBAL	Westernmost_Easting	double	-162.5903
variable	Date_UTC		String
attribute	Date_UTC	long_name	String	Date_utc
attribute	Date_UTC	units	String	unitless
variable	CTD_Start_Time_or_Alvin_Niskin_Closure_UTC		String
attribute	CTD_Start_Time_or_Alvin_Niskin_Closure_UTC	long_name	String	Ctd_start_time_or_alvin_niskin_closure_utc
attribute	CTD_Start_Time_or_Alvin_Niskin_Closure_UTC	units	String	unitless
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.71592272E9, 1.7176245E9
attribute	time	axis	String	T
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	Iso_datetime_utc
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	Site_Name		String
attribute	Site_Name	long_name	String	Site_name
attribute	Site_Name	units	String	unitless
variable	CTD_or_Alvin_Sample_Number		String
attribute	CTD_or_Alvin_Sample_Number	long_name	String	Ctd_or_alvin_sample_number
attribute	CTD_or_Alvin_Sample_Number	units	String	unitless
variable	Waypoint		int
attribute	Waypoint	actual_range	int	1, 9
attribute	Waypoint	long_name	String	Waypoint
attribute	Waypoint	units	String	unitless
variable	latitude		float
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	actual_range	float	53.74744, 57.4803
attribute	latitude	axis	String	Y
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	longitude		float
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	actual_range	float	-162.5903, -147.9998
attribute	longitude	axis	String	X
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	Water_Depth		float
attribute	Water_Depth	actual_range	float	11.0, 4960.0
attribute	Water_Depth	long_name	String	Water_depth
attribute	Water_Depth	units	String	meters below sea level (mbsl)
variable	Methane		float
attribute	Methane	actual_range	float	4.2, 22051.0
attribute	Methane	long_name	String	Methane
attribute	Methane	units	String	nanomoles per liter (nmol L-1)
variable	Methane_oxidation_Replicate_1		float
attribute	Methane_oxidation_Replicate_1	actual_range	float	0.0, 240.0
attribute	Methane_oxidation_Replicate_1	long_name	String	Methane_oxidation_replicate_1
attribute	Methane_oxidation_Replicate_1	units	String	nanomoles per liter per day (nmol L-1 d-1)
variable	Methane_oxidation_Replicate_2		float
attribute	Methane_oxidation_Replicate_2	actual_range	float	0.0, 243.0
attribute	Methane_oxidation_Replicate_2	long_name	String	Methane_oxidation_replicate_2
attribute	Methane_oxidation_Replicate_2	units	String	nanomoles per liter per day (nmol L-1 d-1)
variable	Methane_oxidation_Replicate_3		float
attribute	Methane_oxidation_Replicate_3	actual_range	float	0.0, 13.309
attribute	Methane_oxidation_Replicate_3	long_name	String	Methane_oxidation_replicate_3
attribute	Methane_oxidation_Replicate_3	units	String	nanomoles per liter per day (nmol L-1 d-1)
variable	pmoA_gene_copy_number		float
attribute	pmoA_gene_copy_number	actual_range	float	0.1, 6.86
attribute	pmoA_gene_copy_number	long_name	String	Pmoa_gene_copy_number
attribute	pmoA_gene_copy_number	units	String	Log pmoA copies per liter

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.