ERDDAP > info > bcodmo_dataset_768110

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	public	Physical description of marine lakes: surface area, distance to ocean, tidal efficiency, depth, and stratification		I   M	background			BCO-DMO	bcodmo_dataset_768110

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	Lake Bathymetry Mapping The bathymetry of the lakes was recorded with a purpose-built lightweight, low-power echosounder unit with integrated GPS and AHRS (attitude and heading reference system), towed behind a kayak. (Data courtesy of Herwig Stibor, Thomas Stieglitz.) Lake Bathymetry Analysis Raw bathymetry data were down-sampled to include one sample every 2\u00a0m distance along the survey track. Data were visually inspected and false soundings removed. In some lakes, GPS reception was partially compromised along the steep shorelines. Where required to not compromise data density, the survey track was reconstructed from field notes and AHRS data (less than 5% of data where applicable). During the bathymetry surveys, tidal water level was not recorded. Therefore, tidal water level variations were corrected for by modeling tidal water level in each lake. The water level for each lake was correlated with tidal water level measured at a reference station at CRRF or predicted tide (x-tide database), by determining tidal lag time and tidal efficiency (see below) from data previously collected concurrently in the respective lake and at this reference station. Subsequently, bathymetry data was reduced to a grid with 2m resolution by kriging of a further down-sampled subset of data using every third data point. Lake-specific variograms were applied, and contour lines and total lake volumes were calculated in a GIS. (Data courtesy of Thomas Stieglitz.) Distance from lake to ocean & lake surface area Lake shorelines and island coastlines were manually extracted from satellite data (Microsoft Bing). The nearest, mean and median distance of each lake to the respective island\u2019s coastline as well as lake surface area was calculated in a GIS. The perimeter was measured in meters using the \u2018Measure Line\u2019 tool in QGIS 3.4. Habitable surface area for benthic organisms was estimated either as (1) a multiple of the perimeter and depth of the chemocline, i.e. assuming a cylindrical model for the lake, or (2) as the area of a frustum, i.e. a truncated cone, using the perimeter of the lake at the surface, the average length of transects, and the average angle of the transect from the vertical (estimated using the sine of maximum depth / transect length). Tidal lag time and tidal efficiency were calculated from concurrently measured tidal water level in a lake and the adjacent ocean. The tidal lag time \u2014 the time between high tide in the adjacent ocean and high tide in the lake \u2014 was determined by least-square fit between lake and ocean tide measured using HOBO 30-foot depth Titanium water level data loggers (Part # U20-001-01-Ti).\u00a0 Tidal efficiency was calculated as the ratio between amplitude of ocean tide and lake tide (e.g. Ayers, JF and Vacher, HL, 1986.\u00a0 Hydrogeology of an Atoll Island: A Conceptual Model from a Detailed Study of a Micronesian Example. Groundwater 24(2) 185-198.). Larger tidal lag time and smaller tidal efficiency respectively indicate a less efficient hydrological connection between ocean and lake. Error-checking: Estimates of basic dimensions (depth, distance, length, surface area) were double-checked manually for a subset of measurements by a second person using using Google Earth.\u00a0
attribute	NC_GLOBAL	awards_0_award_nid	String	55103
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1241255
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1241255
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	David L. Garrison
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	50534
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Lake physical Palau marine lake physical descriptions M. Dawson (UC-Merced) version date: 2019-05-13
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	2019-05-16T12:47:21Z
attribute	NC_GLOBAL	date_modified	String	2019-07-08T12:59:48Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.768110.1
attribute	NC_GLOBAL	geospatial_vertical_max	double	22.56
attribute	NC_GLOBAL	geospatial_vertical_min	double	0.91
attribute	NC_GLOBAL	geospatial_vertical_positive	String	down
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/768110
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	Used to determine tidal lag time, the time between high tide in the adjacent ocean and high tide in the lake.
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	768137
attribute	NC_GLOBAL	instruments_0_description	String	Electronic devices that record data over time or in relation to location either with a built-in instrument or sensor or via external instruments and sensors.
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Data Logger
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	731353
attribute	NC_GLOBAL	instruments_0_supplied_name	String	HOBO 30-foot depth Titanium water level data loggers (Part # U20-001-01-Ti)
attribute	NC_GLOBAL	keywords	String	actual, area, bco, bco-dmo, biological, chemical, code, cylinder, data, dataset, depth, distance, distance_to_ocean_mean_m, distance_to_ocean_median_m, distance_to_ocean_min_m, dmo, efficiency, erddap, frustum, habitable, habitable_surface_area_cylinder, habitable_surface_area_frustum, lag, lake, lake_code, length, management, max, max_actual_depth_m, mean, mean_transect_length_m, median, min, minutes, ocean, oceanography, office, perimeter, perimeter_m, preliminary, stratified, surface, surface_area_m2, tidal, tidal_efficiency, tidal_lag_time_minutes, time, transect, volume, volume_m3
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/768110/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/768110
attribute	NC_GLOBAL	param_mapping	String	{'768110': {'max_actual_depth_m': 'master - depth'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/768110/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of California-Merced
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	UC Merced
attribute	NC_GLOBAL	people_0_person_name	String	Michael N Dawson
attribute	NC_GLOBAL	people_0_person_nid	String	51577
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	PaPaPro
attribute	NC_GLOBAL	projects_0_acronym	String	PaPaPro
attribute	NC_GLOBAL	projects_0_description	String	This project will survey the taxonomic, genetic, and functional diversity of the organisms found in marine lakes, and investigate the processes that cause gains and losses in this biodiversity. Marine lakes formed as melting ice sheets raised sea level after the last glacial maximum and flooded hundreds of inland valleys around the world. Inoculated with marine life from the surrounding sea and then isolated to varying degrees for the next 6,000 to 15,000 years, these marine lakes provide multiple, independent examples of how environments and interactions between species can drive extinction and speciation. Researchers will survey the microbes, algae, invertebrates, and fishes present in 40 marine lakes in Palau and Papua, and study how diversity has changed over time by retrieving the remains of organisms preserved in sediments on the lake bottoms. The project will test whether the number of species, the diversity of functional roles played by organisms, and the genetic diversity within species increase and decrease in parallel; whether certain species can greatly curtail diversity by changing the environment; whether the size of a lake determines its biodiversity; and whether the processes that control diversity in marine organisms are similar to those that operate on land. Because biodiversity underlies the ecosystem services on which society depends, society has a great interest in understanding the processes that generate and retain biodiversity in nature. This project will also help conserve areas of economic importance. Marine lakes in the study region are important for tourism, and researchers will work closely with governmental and non-governmental conservation and education groups and with diving and tourism businesses to raise awareness of the value and threats to marine lakes in Indonesia and Palau.
attribute	NC_GLOBAL	projects_0_end_date	String	2017-12
attribute	NC_GLOBAL	projects_0_geolocation	String	Western Pacific; Palau; Indonesia (West Papua)
attribute	NC_GLOBAL	projects_0_name	String	Do Parallel Patterns Arise from Parallel Processes?
attribute	NC_GLOBAL	projects_0_project_nid	String	2238
attribute	NC_GLOBAL	projects_0_project_website	String	http://marinelakes.ucmerced.edu/
attribute	NC_GLOBAL	projects_0_start_date	String	2013-01
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	summary	String	Physical description of marine lakes including surface area, distance to ocean, tidal efficiency, depth, and stratification.
attribute	NC_GLOBAL	title	String	Physical description of marine lakes: surface area, distance to ocean, tidal efficiency, depth, and stratification
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	lake		String
attribute	lake	bcodmo_name	String	site
attribute	lake	description	String	common name for lake
attribute	lake	long_name	String	Lake
attribute	lake	units	String	unitless
variable	lake_code		String
attribute	lake_code	bcodmo_name	String	site
attribute	lake_code	description	String	3-letter code for sampled lake name
attribute	lake_code	long_name	String	Lake Code
attribute	lake_code	units	String	unitless
variable	volume_m3		int
attribute	volume_m3	_FillValue	int	2147483647
attribute	volume_m3	actual_range	int	12038, 1458890
attribute	volume_m3	bcodmo_name	String	volume
attribute	volume_m3	description	String	estimated volume of the lake (m3)
attribute	volume_m3	long_name	String	Volume M3
attribute	volume_m3	units	String	meters^3
variable	surface_area_m2		int
attribute	surface_area_m2	_FillValue	int	2147483647
attribute	surface_area_m2	actual_range	int	980, 79636
attribute	surface_area_m2	bcodmo_name	String	surface_area
attribute	surface_area_m2	description	String	Surface area of the lake (m2).
attribute	surface_area_m2	long_name	String	Surface Area M2
attribute	surface_area_m2	units	String	meters^2
variable	distance_to_ocean_min_m		short
attribute	distance_to_ocean_min_m	_FillValue	short	32767
attribute	distance_to_ocean_min_m	actual_range	short	24, 501
attribute	distance_to_ocean_min_m	bcodmo_name	String	unknown
attribute	distance_to_ocean_min_m	description	String	Minimum distance from a lake’s edge to the surrounding lagoon (m)
attribute	distance_to_ocean_min_m	long_name	String	Distance To Ocean Min M
attribute	distance_to_ocean_min_m	units	String	meters
variable	distance_to_ocean_mean_m		short
attribute	distance_to_ocean_mean_m	_FillValue	short	32767
attribute	distance_to_ocean_mean_m	actual_range	short	48, 542
attribute	distance_to_ocean_mean_m	bcodmo_name	String	unknown
attribute	distance_to_ocean_mean_m	description	String	Mean distance from a lake’s edge to the surrounding lagoon (m).
attribute	distance_to_ocean_mean_m	long_name	String	Distance To Ocean Mean M
attribute	distance_to_ocean_mean_m	units	String	meters
variable	distance_to_ocean_median_m		short
attribute	distance_to_ocean_median_m	_FillValue	short	32767
attribute	distance_to_ocean_median_m	actual_range	short	52, 540
attribute	distance_to_ocean_median_m	bcodmo_name	String	unknown
attribute	distance_to_ocean_median_m	description	String	Median distance from a lake’s edge to the surrounding lagoon (m).
attribute	distance_to_ocean_median_m	long_name	String	Distance To Ocean Median M
attribute	distance_to_ocean_median_m	units	String	meters
variable	tidal_lag_time_minutes		short
attribute	tidal_lag_time_minutes	_FillValue	short	32767
attribute	tidal_lag_time_minutes	actual_range	short	0, 190
attribute	tidal_lag_time_minutes	bcodmo_name	String	unknown
attribute	tidal_lag_time_minutes	description	String	the time between high tide in the adjacent ocean and high tide in the lake
attribute	tidal_lag_time_minutes	long_name	String	Tidal Lag Time Minutes
attribute	tidal_lag_time_minutes	units	String	minutes
variable	tidal_efficiency		float
attribute	tidal_efficiency	_FillValue	float	NaN
attribute	tidal_efficiency	actual_range	float	0.17, 0.99
attribute	tidal_efficiency	bcodmo_name	String	unknown
attribute	tidal_efficiency	description	String	the ratio between amplitude of ocean tide and lake tide.
attribute	tidal_efficiency	long_name	String	Tidal Efficiency
attribute	tidal_efficiency	units	String	unitless
variable	mean_transect_length_m		double
attribute	mean_transect_length_m	_FillValue	double	NaN
attribute	mean_transect_length_m	actual_range	double	1.167925, 49.855
attribute	mean_transect_length_m	bcodmo_name	String	len_track
attribute	mean_transect_length_m	description	String	average of distance_trans for the lake from https://www.bco-dmo.org/dataset/541181
attribute	mean_transect_length_m	long_name	String	Mean Transect Length M
attribute	mean_transect_length_m	units	String	meters
variable	depth		double
attribute	depth	_CoordinateAxisType	String	Height
attribute	depth	_CoordinateZisPositive	String	down
attribute	depth	_FillValue	double	NaN
attribute	depth	actual_range	double	0.91, 22.56
attribute	depth	axis	String	Z
attribute	depth	bcodmo_name	String	depth
attribute	depth	description	String	maximum depth_m for the lake from https://www.bco-dmo.org/dataset/541181
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Max Actual Depth M
attribute	depth	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/DEPH/
attribute	depth	positive	String	down
attribute	depth	standard_name	String	depth
attribute	depth	units	String	m
variable	perimeter_m		double
attribute	perimeter_m	_FillValue	double	NaN
attribute	perimeter_m	actual_range	double	118.6785825, 1898.121669
attribute	perimeter_m	bcodmo_name	String	unknown
attribute	perimeter_m	description	String	circumference of lake (m).
attribute	perimeter_m	long_name	String	Perimeter M
attribute	perimeter_m	units	String	meters
variable	habitable_surface_area_cylinder		double
attribute	habitable_surface_area_cylinder	_FillValue	double	NaN
attribute	habitable_surface_area_cylinder	actual_range	double	352.2554619, 68121.25011
attribute	habitable_surface_area_cylinder	bcodmo_name	String	surface_area
attribute	habitable_surface_area_cylinder	description	String	An estimate of the area of the benthic zone above the chemocline; based on the model of lake shape as a cylinder.
attribute	habitable_surface_area_cylinder	long_name	String	Habitable Surface Area Cylinder
attribute	habitable_surface_area_cylinder	units	String	meters^2
variable	habitable_surface_area_frustum		double
attribute	habitable_surface_area_frustum	_FillValue	double	NaN
attribute	habitable_surface_area_frustum	actual_range	double	316.1651968, 61157.96127
attribute	habitable_surface_area_frustum	bcodmo_name	String	surface_area
attribute	habitable_surface_area_frustum	description	String	An estimate of the area of the benthic zone above the chemocline; based on the model of lake shape as a truncated cone.
attribute	habitable_surface_area_frustum	long_name	String	Habitable Surface Area Frustum
attribute	habitable_surface_area_frustum	units	String	meters^2
variable	stratified		byte
attribute	stratified	_FillValue	byte	127
attribute	stratified	actual_range	byte	0, 1
attribute	stratified	bcodmo_name	String	unknown
attribute	stratified	description	String	whether a lake is vertically stratified (1) or holomictic (0)
attribute	stratified	long_name	String	Stratified
attribute	stratified	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.