Dataset: Light intensity measurements associated with Octocoral Canopies from Yawzi Point, St. John, U.S. Virgin Islands

Name: Light intensity (lux) of downwelling light upon the benthos along differing conditions of octocoral canopy formation in Lameshur Bay St. John, U.S. Virgin Islands in March of 2019
Published: 2023-03-21
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.892272.1

Spatial Extent: N:18.3154 E:-64.7252 S:18.3154 W:-64.7252

Temporal Extent: 2019-03-12

Project:

Collaborative Research: Pattern and process in the abundance and recruitment of Caribbean octocorals (Octocoral Community Dynamics)

RUI: Pattern and process in four decades of change on Caribbean reefs (St John Coral Reefs)

Principal Investigator:

Peter J. Edmunds (California State University Northridge, CSUN)

Student:

John Girard (California State University Northridge, CSUN)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2023-03-21

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Light intensity (lux) of downwelling light upon the benthos along differing conditions of octocoral canopy formation in Lameshur Bay St. John, U.S. Virgin Islands in March of 2019

Abstract:

These data represent the light intensity (lux) of downwelling light upon the benthos along differing conditions of octocoral canopy formation. Measurements were recorded every second from 05:00:00 to 23:05:21 (Local Time, Atlantic Standard Time, GMT-04:00) on March 12th, 2019 using HOBO light loggers (model UA-0002-64). Loggers were placed at ~8-m depth at Yawzi point, in Lameshur Bay, St. John U.S. Virgin Islands. These data were used to evaluate the potential creation of differential light regimes between sparse and dense octocoral canopies consistent with sunflecking. These data were collected as part of an NSF Coral Reef Time Series, Virgin Islands: Long-term coral reef community dynamics in the Virgin Islands National Park and were published in Girard and Edmunds (2023).

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2023-03-21	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.892272.1	2023-05-24

Methods & Sampling

Location: Yawzi Point, Lameshur Bay St. John, U.S. Virgin Islands at 8 m depth.
Research conducted from the University of the Virgin Islands Marine Station in Lameshure Bay during March 2019.

Methods & Sampling:

Measurements were recorded every second from 05:00:00 to 23:05:21 (Local Time, Atlantic Standard Time, GMT-04:00) on March 12th, 2019 using HOBO light loggers (model UA-0002-64). Loggers were placed at ~8-m depth at Yawzi point, in Lameshur Bay, St. John U.S. Virgin Islands.

Each logger was secured in the center of a quadrat (1 m2), in which octocorals were censused, and a level was used to fix the sensor perpendicular to the horizon. Deployment occurred on days characterized by sunshine and scattered clouds, and low wind speeds of ~ 6.0–8.5 m s-1 (CariCOOS buoy 41052, ~ 8 km SW of Cabritte Horn).

Instruments:

HOBO Light and Temperature Logger, Model UA-0002-64

Data Processing Description

BCO-DMO Data Manager Processing Notes:
* File "St.John_Yawzi Point HOBO Data_March2019.csv" imported as the primary table for this dataset.
* lat lon values added into the table by joining with the site list.
* site name added to data table
* DateTime in UTC ISO 8601 format added to data table from UTC-4 timestamp
* Column names adjusted to conform to BCO-DMO naming conventions designed to support broad re-use by a variety of research tools and scripting languages. [Only numbers, letters, and underscores. Can not start with a number]

Data Files

File
benthic_light.csv (Comma Separated Values (.csv), 6.03 MB) MD5:59c7f7af916bfeb89ceb569eb9d95a0a Primary data table for dataset 892272.

Supplemental Files

File

Site List
filename: site_list.csv

(Comma Separated Values (.csv), 192 bytes)
MD5:4415feb2d663fc251a671a2a7c5cac04

Site list for all dataset related to the results publication Girard and Edmunds (2023). 

Parameters (column names, descriptions, and units): 

Site, Site name used in dataset related to Girard and Edmunds (2023),unitless
lat, Site latitude,decimal degrees
lon,Site longitude,decimal degrees
Alternate_name, Alternate name for the site,unitless

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1756678
NSF Division of Ocean Sciences	OCE-2019992

Deployments

None available yet

Instruments

Onset HOBO Pendant Temperature/Light Data Logger

Supplied Name: HOBO Light and Temperature Logger, Model UA-0002-64

Supplied Description:

Instrument Type

Generic Name: Onset HOBO Pendant Temperature/Light Data Logger

Acronym: Onset HOBO Pendant Temp/Light

Generic Description:

The Onset HOBO (model numbers UA-002-64 or UA-001-64) is an in-situ instrument for wet or underwater applications. It supports light intensity, soil temperature, temperature, and water temperature. A two-channel logger with 10-bit resolution can record up to approximately 28,000 combined temperature and light measurements with 64K bytes memory. It has a polypropylene housing case. Uses an optical USB to transmit data. A solar radiation shield is used for measurement in sunlight. Temperature measurement range: -20 deg C to 70 deg C (temperature). Light measurement range: 0 to 320,000 lux. Temperature accuracy: +/- 0.53 deg C from 0 deg C to 50 deg C. Light accuracy: Designed for measurement of relative light levels. Water depth rating: 30 m.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
site	Site name	unitless	site
lat	site latitude	decimal degrees	lat
lon	site longitude	decimal degrees	lon
DateTime_GMTminus04	Date and time of sample (time zone GMT-4) Format: %m-%d-%Y %H:%M:%S	units	DateTime
ISO_DateTime_UTC	Date and time of sample (time zone UTC) in ISO 8601 format Format: %Y-%m-%dT%H:%M:%SZ	units	ISO_DateTime_UTC
YW5_No_Canopy_lux	Light intensity in lux measured in quadrat coded as YW5 No Canopy	lux (lx)	light_intensity
YW1_Canopy_lux	Light intensity in lux measured in quadrat coded as YW1 Canopy	lux (lx)	light_intensity
YW2_Canopy_lux	Light intensity in lux measured in quadrat coded as YW2 Canopy	lux (lx)	light_intensity
YW3_Canopy_lux	Light intensity in lux measured in quadrat coded as YW3 Canopy	lux (lx)	light_intensity
YW4_No_Canopy_lux	Light intensity in lux measured in quadrat coded as YW4 No Canopy	lux (lx)	light_intensity

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Database

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Dataset: Light intensity measurements associated with Octocoral Canopies from Yawzi Point, St. John, U.S. Virgin Islands