Dataset: sed_temp

Name: Temperature profiles collected from the sediments off the South Atlantic Bight from 2015-05-01 to 2017-05-10
Published: 2019-12-30
Keywords: oceans

View Data: Data not available yet

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Spatial Extent: N:32.75 E:-79.75 S:32.75 W:-79.75

Temporal Extent: 2015-05-01 - 2017-05-10

Project:

Fluid and chemical fluxes across the seafloor of a passive margin (passive margin fluxes)

Principal Investigator:

Alicia M Wilson (University of South Carolina at Columbia)

Co-Principal Investigator:

Willard S. Moore (University of South Carolina at Columbia)

Scott M. White (University of South Carolina at Columbia)

BCO-DMO Data Manager:

Mathew Biddle (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2019-12-30

Restricted:

Validated:

Current State:

Data not available

Temperature profiles collected from the sediments off the South Atlantic Bight from 2015-05-01 to 2017-05-10

Abstract:

Heat has been widely used as an inexpensive tracer in groundwater systems (Anderson 2005; Constanz 2008), including studies of SGD (Taniguchi 2000; Moore and Wilson 2005; Martin et al 2006). In our system, the temperature of sub-seafloor porewaters differs from the temperature of overlying seawater owing to seasonal variations in surface temperature. We can thus use heat in two ways: (1) to measure the depth of rapid flushing events and (2) to estimate rates of long-term regional flow.

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Description

Methods & Sampling

Temperature loggers were installed inside nominal 1 ¼-inch stainless steel wells that were screened over the bottom 30 cm to allow collection of water samples. The wells were sealed at the top (typically 50 cm above the seafloor) with PVC caps, from which HOBOware Tidbit temperature loggers were suspended on a 1.3 cm-wide a strip of polypropylene. Bottom water temperature was collected at each site by a temperature logger protected by a casing made of nominal 1 ¼-inch PVC well screen and attached to the casing near the seafloor. In the spring of 2016 concerns about thermal overturn within the wells led us to install and instrument a second set of casings 2-3 m from the original wells. The new installations, referred to as stakes, were filled with sand after the instrument string was installed, to prevent thermal overturn.

Data Processing Description

BCO-DMO Processing Notes:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- re-formatted date from m/d/yyyy to ISO DateTime format following the convention YYYY-MM-DDTHH:MM:SS
- added lat, lon columns from metadata
- re-organized the data structure into one column for temperature and one column for depth

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Earth Sciences	EAR-1316250

Deployments

None available yet

Instruments

Onset HOBO TidbiT v2 (UTBI-001) temperature logger

Supplied Name: Onset HOBO TidbiT v2 Water Temperature Data logger

Supplied Description:

Onset HOBO TidbiT v2 Water Temperature Data logger with 12-bit resolution and has ±0.2 °C accuracy. It is designed for outdoor and underwater environments and is waterproof (https://www.onsetcomp.com/products/hobo-data-loggers/waterproof) to 300 m (1000 ft). An optical USB (https://www.onsetcomp.com/products/data-loggers/usb-data-loggers) interface allows users to offload data.

Instrument Type

Generic Name: Onset HOBO TidbiT v2 (UTBI-001) temperature logger

Acronym: HOBO TidBit v2

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/134/

Generic Description:

A temperature logger that measures temperatures over a wide temperature range. It is designed for outdoor and underwater environments and is waterproof to 300 m. A solar radiation shield is required to obtain accurate air temperature measurements in sunlight (RS1 or M-RSA Solar Radiation Shield). With an operational temperature range between -20 degrees Celsius and +70 degrees Celsius, the TidbiT v2 has an accuracy of +/-0.21 and a resolution of 0.02 degrees Celsius.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
date_time	Date and Time in MM/DD/YYYY hh:mm format	unitless	DateTime
file_name	name of the original file which the data was submitted	unitless	file_name
lat	latitude with positive values indicating North	decimal degrees	lat
lon	longitude with negative values indicating West	decimal degrees	lon
ISO_DateTime	Date and time following the ISO convention in YYYY-MM-DDTHH:mm:ss format	unitless	DateTime
depth	Depth of logger in sediment	meters (m)	depth_bsf
temp	water temperature	degrees Celsius (C)	temp

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Dataset: sed_temp