Dataset: TEN Light Data

Name: Light data collected from loggers deployed at the Thalassia Experimental Network (TEN) sites in the Western Atlantic from 2018-2019
Published: 2019-12-19
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.784809.1

Spatial Extent: N:32.2639 E:-64.8307 S:9.3516 W:-97.0348

Temporal Extent: 2018-04-01 - 2019-07-02

Project:

Collaborative Research: The tropicalization of Western Atlantic seagrass beds (Tropicalization Seagrass Beds)

Principal Investigator:

Justin Campbell (Smithsonian Marine Station, SMS)

Co-Principal Investigator:

Andrew Altieri (University of Florida, UF)

James Douglass (Florida Gulf Coast University, FGCU)

Kenneth Heck (Dauphin Island Sea Lab, DISL)

Valerie J. Paul (Smithsonian Marine Station, SMS)

Contact:

Olivia Rhoades (Smithsonian Marine Station, SMS)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2019-12-19

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Light data collected from loggers deployed at the Thalassia Experimental Network (TEN) sites in the Western Atlantic from 2018-2019

Abstract:

Light data collected from loggers deployed at the Thalassia Experimental Network (TEN) sites in the Western Atlantic from 2018-2019.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2019-12-19	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.784809.1	2021-06-30

Description

Light data collected from loggers deployed at the Thalassia Experimental Network (TEN) sites.

Methods & Sampling

Two loggers deployed at the initiation of the project, and continuously recorded light for the duration of the one-year subtidal caging experiment. One logger was cable-tied to a PVC post at the side of the array (next to the cages, to record ambient light), and a second logger was cable-tied to the PVC post within one of the full caged plots (to record light levels within shaded and caged plots). Both loggers were positioned at the height of the seagrass canopy, with sensors oriented parallel to the sediment surface. Light readings were recorded every six minutes. Every two weeks, loggers were removed from the field, cleaned with a mild vinegar solution (10% vinegar, 90% water), and data were downloaded.

Data Processing Description

Data Processing: Data was processed in the R Statistical Software (R version 3.6.1 (2019-07-05)). All data files were merged and QA/QC'ed to ensure proper and consistent formatting. All files were cleaned by omitting time periods where the loggers were removed from the water, and calibrating the raw light readings with logger-specific calibration equations.

Problem Report: During some periods at a given site, there was only one working logger. This logger was placed inside the cage. In the dataset's current state, some data has unknown location (IN vs OUT of the cage) since there are still some loggers that need to be downloaded. These data are denoted with "??", and will be assigned proper labeling once all the data is secured.

BCO-DMO Processing:
- added latitude, longitude, and full site names from the site cooridnates file provided to BCO-DMO;
- converted the latitude and longitude values from degrees-minutes-seconds to decimal degrees.

Data Files

File
TEN_light.csv (Comma Separated Values (.csv), 116.65 MB) MD5:322761c2d1eed697549ac6677cdaa361 Primary data file for dataset ID 784809

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1737247

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
TEN_2018-2019		2018-04-16	Thalassia Experimental Network		data info

Instruments

Photosynthetically Available Radiation Sensor

Supplied Name: Odyssey Submersible PAR light logger

Supplied Description:

Odyssey Submersible PAR light loggers. Light loggers were individually calibrated against a Li-Cor 2pi PAR sensor connected to a Licor.

Instrument Type

Generic Name: Photosynthetically Available Radiation Sensor

Acronym: PAR sensor

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/122/

Generic Description:

A PAR sensor measures photosynthetically available (or active) radiation. The sensor measures photon flux density (photons per second per square meter) within the visible wavelength range (typically 400 to 700 nanometers). PAR gives an indication of the total energy available to plants for photosynthesis. This instrument name is used when specific type, make and model are not known.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
site	Site code; refer to "full_names" column for complete name	unitless	Site_ID
location	Placement either inside (IN) or outside (OUT) of a cage. If unknown: "??" or "??n", where n = an integer 2, 3, or 4	unitless	site_descrip
date_time	Date and time (local) each reading was taken; format: yyyy-mm-ddTHH:MM	unitless	ISO_DateTime_Local
raw_light_value	Raw light reading	unitless	no_bcodmo_term
calibrated_light_value	Light reading converted from raw light data.	umol photons m-2 s-1	PAR_photons
logger_serial_number	Serial number identifying specific logger that recorded each reading	unitless	instrument
full_names	Full name of the site	unitless	site
lat_dd	Site latitude in decimal degrees	degrees	lat
lon_dd	Site longitude in deicmal degrees	degrees	lon

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Database

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Dataset: TEN Light Data