Dataset: Correlating HOBO light intensity (lux) to PME PAR in Lameshur Bay St. John U.S. Virgin Islands

Name: Simultaneous light intensity measurements from a HOBO light intensity logger and a cosine-corrected PAR sensor in Lameshur Bay, St. John, U.S. Virgin Islands in January of 2021
Published: 2023-03-21
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.892308.1

Spatial Extent: N:18.3113 E:-64.7226 S:18.3113 W:-64.7226

Temporal Extent: 2021-01-25 - 2021-01-27

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

Simultaneous light intensity measurements from a HOBO light intensity logger and a cosine-corrected PAR sensor in Lameshur Bay, St. John, U.S. Virgin Islands in January of 2021

Abstract:

These data represent simultaneous measurements taken by a HOBO light intensity logger (model UA-0002-64) measuring in lux and a cosine-corrected PAR sensor (LI-192, Li-Cor Biosciences) fitted by the manufacturer into a logger (miniPAR, Precision Measurement Engineering) measuring PAR in µmol photon m-2 s-1. This was done at the Tektite site at 9 m depth in Lameshur Bay, St. John, U.S. Virgin Islands during January of 2021. This was done to cross-calibrate illuminance data (lux) from the HOBO logger to PAR (µmol photon m-2 s-1) (after Long et al. 2012) for assistance in the ecological interpretation of illuminance data. 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	Date Assigned
2023-03-21	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.892308.1	2023-05-24

Methods & Sampling

Location
Tektite site in Lameshur Bay, St. John, U.S. Virgin Islands at 9-m depth
Research conducted from the University of the Virgin Islands Marine Station in Lameshur Bay in Jan 2019.

Methods & Sampling:
The HOBO and PAR logger were synchronized, deployed next to one another at 9-m depth with their light sensors at the same depth and perpendicular to the surface. Loggers were deployed at the Tektite site, and set to take a light measurement once every minute. Loggers started sampling at 14:05:00 (Local Time, Atlantic Standard Time, GMT -4) on January 25th 2021 and stopped sampling at 16:45:00 on January 27th 2021. Sampling days were characterized as clear, and sunny with few passing clouds and a calm sea state.

Instruments:
HOBO Light and Temperature Logger, Model UA-0002-64
Cosine-corrected PAR sensor (LI-192, Li-Cor Biosciences) fitted by the manufacturer into a logger (miniPAR, Precision Measurement Engineering)

Data Processing Description

BCO-DMO Data Manager Processing Notes:
* File "St.John_Light Lux to PAR Correlation Data_Jan2021.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
light_lux_and_PAR.csv (Comma Separated Values (.csv), 236.40 KB) MD5:fd93b952268a30f5cbe8c6008d7d07c2 Primary data table for dataset 892308.

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.

PME miniPAR logger

Supplied Name: LI-192, miniPAR

Supplied Description:

Cosine-corrected PAR sensor (LI-192, Li-Cor Biosciences) fitted by the manufacturer into a logger (miniPAR, Precision Measurement Engineering)

Instrument Type

Generic Name: PME miniPAR logger

Generic Description:

A submersible instrument that logs PAR (Photosynthetically Active Radiation), temperature and tilt measurements. Data are recorded on an internal SD card. The sensor is a LI-192 Underwater Quantum Sensor, manufactured by LI-COR. The sensor uses a silicon photodiode and glass optical filters to create a uniform sensitivity to light wavelengths in the 400-700nm range. It measures PAR from all angles in one hemisphere. An anti-fouling wiper is available. The instrument can be configured to record at intervals between 1 and 60 minutes. It is submersible up to 100 metres. PAR measurement accuracy is dependent upon the stability of the sensor pointed towards the water surface.

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: %Y-%m-%d %H:%M:%S	unitless	DateTime
ISO_DateTime_UTC	Date and time of sample (time zone UTC) in ISO 8601 format Format: %Y-%m-%dT%H:%M:%SZ	unitless	ISO_DateTime_UTC
HOBO_Light_Intensity	Light intensity in lux from the HOBO logger	lux (lx)	light_intensity
PME_PAR	Light intensity corresponding to PAR wavelengths from the PME PAR logger	micromoles of photons per meter squared per second (umol photon m-2 s-1 )	PAR

Database

Contribute Data

Dataset: Correlating HOBO light intensity (lux) to PME PAR in Lameshur Bay St. John U.S. Virgin Islands