Dataset: HOBO temperatures from eelgrass field surveys

Name: In situ temperature measurements from eelgrass meadow field sites along the west coast of North America recorded from July 2019 to July 2021
Published: 2022-10-14
Keywords: seawater temperature, eelgrass meadow, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.877355.1

Spatial Extent: N:55.739078 E:-117.10621 S:32.62535 W:-133.342896

Temporal Extent: 2019-06-04 - 2021-11-07

Project:

Collaborative Research: The role of a keystone pathogen in the geographic and local-scale ecology of eelgrass decline in the eastern Pacific (Eelgrass disease)

Principal Investigator:

Drew Harvell (Cornell University, Cornell)

Co-Principal Investigator:

J. Emmett Duffy (Smithsonian Environmental Research Center, SERC)

Carla P. Gomes (Cornell University, Cornell)

Timothy Hawthorne (University of Central Florida, UCF)

John J. Stachowicz (University of California-Davis, UC Davis)

Scientist:

Lillian Aoki (Cornell University, Cornell)

Data Manager:

Lillian Aoki (University of Oregon)

BCO-DMO Data Manager:

Dana Stuart Gerlach (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2022-10-14

Restricted:

Validated:

Yes

Current State:

Final no updates expected

In situ temperature measurements from eelgrass meadow field sites along the west coast of North America recorded from July 2019 to July 2021

Abstract:

As part of field surveys to measure effects of eelgrass wasting disease, HOBO temperature loggers were deployed from July 2019 to July 2021 at field sites along the west coast of North America to provide a continuous record of in situ temperatures.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2022-10-14	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.877355.1	2022-10-21

Methods & Sampling

In-situ temperature measurements
As part of field surveys to measure effects of eelgrass wasting disease, HOBO temperature loggers were deployed to provide a continuous record of in situ temperatures.

Temperature loggers (HOBO MX 2201 and UA-001-64, Onset, Bourne, MA) were deployed at each eelgrass meadow site. Loggers were secured to metal stakes in the sediment, resting approximately 2 cm above the sediment surface. To provide a continuous record of in situ temperature, loggers were swapped out during surveys as needed.

Field surveys
Field surveys of eelgrass meadow sites were conducted at mid-summer low tides at field sites along the west coast of North America in the U.S. and Canada. Samples and data were collected within the intertidal area of 32 eelgrass meadows distributed in six regions (Alaska, British Columbia, Washington, Oregon, California -Bodega Bay, and California -San Diego). Surveys were conducted between late June and early August in 2019, 2020, and 2021 by teams from six institutions.

For each site, three 20 meter transects were laid parallel to the shore at the shoreward/upper edge of continuous eelgrass, and three lower/ intertidal 20 meter transects were laid at least 4 meters closer to the water. To assess disease impacts, eelgrass blades and shoots were collected for analysis at each meter along the transect. Shoot density and canopy cover were measured at the same 4 meter intervals. See Related datasets section for 'Shoot Metrics', 'Shoot Density', and 'Eelgrass Disease Metrics'.

Salinity was measured at the time of sampling using a refractometer. Transect locations were recorded using a hand-held GPS (exact model varied between field locations).

Data Processing Description

BCO-DMO Processing:
- Imported data from source file "NSFWD_HOBO_all.csv" into the BCO-DMO data system.
- Joined this temperature data with the file "eelgrass_study_revised_site_metadata.csv" which had coordinates converted to decimal degrees and consistent LocationNames.
- Added conventional header with dataset name, PI name, version date.
- Modified parameter (column) names to conform with BCO-DMO naming conventions.

Data Files

File
temp_logger_data.csv (Comma Separated Values (.csv), 472.75 MB) MD5:978b332b0d2b06a48a869b67de30d8a1 Primary data file for dataset ID 877355

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1829890
NSF Division of Ocean Sciences	OCE-1829921
NSF Division of Ocean Sciences	OCE-1829922
NSF Division of Ocean Sciences	OCE-1829992

Deployments

None available yet

Instruments

Onset HOBO Pendant MX2201 temperature logger

Supplied Name: HOBO MX2201 temperature logger

Supplied Description:

Instrument Type

Generic Name: Onset HOBO Pendant MX2201 temperature logger

Acronym: Onset HOBO Pendant MX2201

Generic Description:

The Onset HOBO MX2201 is an in-situ instrument for wet or underwater applications. It supports soil temperature, temperature, and water temperature. A one-channel logger that records up to approximately 96,000 measurements or internal logger events with 8K bytes memory. It has a polypropylene housing case. Uses Bluetooth to transmit data. Can be used with a solar radiation shield. Measurement range: -20 deg C to 70 deg C. Accuracy: +/- 0.50 deg C from 0 deg C to 50 deg C. Water depth rating: 30.5 m

Onset HOBO Pendant Temperature/Light Data Logger

Supplied Name: HOBO UA-001-064 temperature logger

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
DateTime_Obs	Datetime record of the in-situ temperature logger time of observation Format: %Y-%m-%dT%H:%M:%SZ	units	date
ID	Location ID to identify temperature logger locations. ID is a compilation of region, site code, tidal height, and transect number.	units	site
Region	Two-letter identifier for the geographic region where the sample was collected (AK=Alaska, BC=British Columbia, WA=Washington, OR=Oregon, BB=Bodega Bay in California, SD=San Diego in California)	units	region
Location_Name	Full name of each sampling site (eelgrass meadow) where samples were taken	units	site_descrip
Site_Code	One-letter identifier for the site within a geographic region where the sample was collected (A, B, C, D, E, F)	units	site
Transect	Integer indicating the transect at which samples were collected. Upper transects = 1, 2, 3; Lower transects = 4, 5, 6.	units	transect
Tidal_Height	Single letter indicating the tidal height at which samples were collected. U = upper tidal height; L = lower tidal height	units	tide
Temp	Temperature recorded from HOBO logger	units	temp
Serial_Number	Serial number identifying a specific temperature logger deployed in the eelgrass meadow	units	inst_serial_numb
TransectBeginDecimalLatitude	Latitudinal coordinate for the beginning of the transect (meter 0)	units	lat
TransectBeginDecimalLongitude	Longitudinal coordinate for the beginning of the transect (meter 0)	units	lon
TransectEndDecimalLatitude	Latitudinal coordinate for the end of the transect (meter 20)	units	lat
TransectEndDecimalLongitude	Longitudinal coordinate for the end of the transect (meter 20)	units	lon
Year	Year in which temperatures were measured	units	year

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Dataset: HOBO temperatures from eelgrass field surveys