Radon isotope results from groundwater wells around Little Lagoon, Alabama from 2010-2012 (LittleLagoonGroundwater project)

Website: https://www.bco-dmo.org/dataset/535127
Version: working toward final
Version Date: 2014-10-13

Project
» Groundwater Discharge, Benthic Coupling and Microalgal Community Structure in a Shallow Coastal Lagoon (LittleLagoonGroundwater)
ContributorsAffiliationRole
Burnett, William C.Florida State University (FSU - EOAS)Principal Investigator
Mortazavi, BehzadUniversity of Alabama-Tuscaloosa (UA/Tuscaloosa)Co-Principal Investigator
Allison, DickyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Coverage

Spatial Extent: N:30.28 E:-87.657 S:30.233 W:-87.891
Temporal Extent: 2010-05-26 - 2012-08-17

Dataset Description

 Radon isotope results from groundwater wells around Lake Shelby, Alabama.  These data are part of a study to assess submarine groundwater discharge.

Results, methodology, summary tables and instrumentation are included in:

Su, Ni, W.C. Burnett, H.L. MacIntyre, J.D. Liefer, R.N. Peterson and R. Viso, 2014.  Natural Radon and Radium Isotopes for Assessing Groundwater Discharge into Little Lagoon, AL: Implications for Harmful Algal Blooms. Estuaries and Coasts, 37: 893-910.   (pdf)

Keywords:  Radon isotopes; Submarine groundwater discharge; algal blooms; 


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Data Files

File
radon_isotopes_gw.csv
(Comma Separated Values (.csv), 2.31 KB)
MD5:4651b4f265e671c87f921a23e0fdf328
Primary data file for dataset ID 535127

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Parameters

ParameterDescriptionUnits
date_local

date at time of collection

dd-mon-yy
year

year of collection

yyyy
yrday_local

day of year - mostly for plotting

julian day
site

descriptive text for station

text
lat

latitude

decimal degrees; North is positive
lon

longitude

decimal degrees; West is negative
sal

salinity

practical salinity units
Rn222

radon isotope 222

disintegrations per minute per Liter
err_Rn222

uncertainty of measurements - plus or minus one delta

disintegrations per minute per Liter
temp

temperature of water

degrees centigrade


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Instruments

Dataset-specific Instrument Name
CTD Diver
Generic Instrument Name
CTD - profiler
Dataset-specific Description
The radon system is integrated with a CTD Diver (Van Essen) and logging GPS with depth- sounding capabilities.
Generic Instrument Description
The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934.

Dataset-specific Instrument Name
RAD-7
Generic Instrument Name
RAD-7 Radon Detector
Dataset-specific Description
Rn in the lagoon surface waters were measured continuously using an automated pumping and sparging system connected to a suite of three RAD-7 detectors arranged with the counting cycles time-parallel for real-time in situ analysis (Burnett et al. 2001; Dulaiova et al.2005). Radon concentrations in discrete samples of deep and shallow groundwater were measured on 250- ml grab samples using an additional radon-in-water (RAD-H2O) accessory (Durridge) to the RAD7 radon detector.
Generic Instrument Description
The DURRIDGE RAD7 is a radon and thoron detector. The RAD7 is a computer-driven electronic detector, with pre-programmed set-ups for common tasks. It's built to withstand everyday use in the field. A rugged case encloses the detector, which is self-contained and self-sufficient. The RAD7 comes with a built-in air pump, rechargeable batteries, and a wireless infrared printer. (https://durridge.com/products/rad7-radon-detector/)


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Deployments

LittleLagoon

Website
Platform
SmallBoat_FSU
Start Date
2010-04-05
End Date
2013-08-17
Description
The sampling sites were all accessed from small boats, here amalgamated to one deployment called LittleLagoon.


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Project Information

Groundwater Discharge, Benthic Coupling and Microalgal Community Structure in a Shallow Coastal Lagoon (LittleLagoonGroundwater)

Coverage: southern Alabama, east of Mobile


 

This project investigated the link between submarine groundwater discharge (SGD) and microalgal dynamics in Little Lagoon, Alabama.  In contrast to most near-shore environments, it is fully accessible; has no riverine inputs; and is large enough to display ecological diversity (c. 14x 0.75 km) yet small enough to be comprehensively sampled on appropriate temporal and spatial scales. The PIs have previously demonstrated that the lagoon is a hot-spot for toxic blooms of the diatom Pseudo-nitzchia spp. that are correlated with discharge from the surficial aquifer. This project assessed variability in SGD, the dependence of benthic nutrient fluxes on microphytobenthos (MPB) abundance and productivity, and the response of the phytoplankton to nutrient enrichment and dilution. The work integrated multiple temporal and spatial scales and demonstrated both the relative importance of SGD vs. benthic recycling as a source of nutrients, and the role of SGD in structuring the microalgal community. (paraphrased from Award abstract)



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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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