Data Package Metadata View Summary

Time series of dissolved methane and carbon dioxide concentrations for Falling Creek Reservoir and Beaverdam Reservoir in southwestern Virginia, USA during 2016-2018

General Information

Data Package:
Local Identifier:	edi.50.2
Title:	Time series of dissolved methane and carbon dioxide concentrations for Falling Creek Reservoir and Beaverdam Reservoir in southwestern Virginia, USA during 2016-2018
Alternate Identifier:	DOI PLACE HOLDER
Abstract:	Depth profiles of carbon dioxide and methane concentrations were sampled during the ice-free period from 2016 to 2018 in two drinking water reservoirs in southwestern Virginia, USA: Beaverdam Reservoir (Vinton, Virginia) and Falling Creek Reservoir (Vinton, Virginia). Both reservoirs are owned and operated by the Western Virginia Water Authority as primary or secondary drinking water sources for Roanoke, Virginia. The dataset consists of depth profiles of dissolved greenhouse gas (carbon dioxide, methane) samples measured at the deepest site of each reservoir adjacent to the dam. Additional samples were collected at a gauged weir on Falling Creek Reservoir's primary inflow tributary. The samples were collected approximately fortnightly from March-April, weekly from May-October, and monthly in November at Falling Creek Reservoir and Beaverdam Reservoir.
Publication Date:	2020-06-25

Time Period

Begin:

2016-03-23

End:

2018-10-29

People and Organizations
Contact:	Carey, Cayelan C. (Virginia Tech) [ email ]
Creator:	Carey, Cayelan C. (Virginia Tech)
Creator:	McClure, Ryan P. (Virginia Tech)
Creator:	Niederlehner, Barbara R. (Virginia Tech)
Creator:	Lofton, Mary E. (Virginia Tech)
Creator:	Hounshell, Alexandria G. (Virginia Tech)

Data Entities
Data Table Name:	DATASET_for_EDI_LOL_MS_10May20.csv
Description:	GHG Dataset

Detailed Metadata

Data Entities

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/edi/50/2/a52f0ae5f9e70ff8448fdb910a2a0a9d
Name:	DATASET_for_EDI_LOL_MS_10May20.csv
Description:	GHG Dataset
Number of Records:	2427
Number of Columns:	8

Table Structure

Object Name:

DATASET_for_EDI_LOL_MS_10May20.csv

Size:

111875 bytes

Authentication:

e821ee7f92343d4b3a4653fcf48cfb7a Calculated By MD5

Text Format:

Number of Header Lines:

Record Delimiter:

\r\n

Orientation:

column

Simple Delimited:

Field Delimiter:

Table Column Descriptions

Column Name:

DateTime

Depth_m

Reservoir

Rep

ch4_umolL

co2_umolL

flag_ch4

flag_co2

Definition:

Date of sampling. All data were collected in the eastern time zone of the U.S.A., with daylight savings time observed.

Depth of sample collection

Three-letter code corresponding to sampled reservoir; FCR = Falling Creek Reservoir; BVR = Beaverdam Reservoir

Replicate sample number. Samples are coded as either 1 or 2.

Dissolved methane concentration

Dissolved carbon dioxide concentration

Flag value for methane concentration; 1 = the percent difference between replicates are <30% and both replicates were retained (i.e., no problems with reps); 2 = The percent difference between replicates was >30% and < 50% (i.e., replicates retained, but were high). Both replicates were retained but flagged; 3 = The percent difference between replicates was >50% (i.e., only one replicate retained). The replicate with the largest difference between replicates collected at depths above and below the sample was removed; 4 = Sample was either not collected or was not retained due to issues with the GC

Flag value for carbon dioxide concentration; 1 = the percent difference between replicates are <30% and both replicates were retained (i.e., no problems with reps); 2 = The percent difference between replicates was >30% and < 50% (i.e., replicates retained, but were high). Both replicates were retained but flagged; 3 = The percent difference between replicates was >50% (i.e., only one replicate retained). The replicate with the largest difference between replicates collected at depths above and below the sample was removed; 4 = Sample was either not collected or was not retained due to issues with the GC

Storage Type:

date

float

string

float

Measurement Type:

dateTime

ratio

nominal

ratio

Measurement Values Domain:

Format	MM/DD/YYYY
Precision

Unit	meter
Type	real
Min	0.1
Max	300

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	BVR
Definition	Beaverdam Reservoir
Source

Code Definition

Code	FCR
Definition	Falling Creek Reservoir
Source

Unit	dimensionless
Type	natural
Min	1
Max	4

Unit	micromolePerLiter
Type	real
Min	5.67e-05
Max	628.0691418

Unit	micromolePerLiter
Type	real
Min	0
Max	965.9310391

Unit	dimensionless
Type	natural
Min	1
Max	4

Unit	dimensionless
Type	natural
Min	1
Max	4

Missing Value Code:

Code	NA
Expl	value is missing

Code	NA
Expl	value is missing

Code	NA
Expl	value is missing

Code	NA
Expl	value is missing

Code	NA
Expl	value is missing

Code	NA
Expl	value is missing

Code	NA
Expl	value is missing

Code	NA
Expl	value is missing

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Data Package Usage Rights

This information is released under the Creative Commons license - Attribution - CC BY (https://creativecommons.org/licenses/by/4.0/). The consumer of these data (\"Data User\" herein) is required to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available \"as is.\" The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

Keywords

By Thesaurus:
carey lab controlled vocabulary	greenhouse gas, Virginia Tech, Stream Team, Western Virginia Water Authority, Falling Creek Reservoir, Beaverdam Reservoir
cuahsi controlled vocabulary	reservoir, lake
lter controlled vocabulary	depth, methane, carbon dioxide, lakes

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Methods and protocols used in the collection of this data package

Description:

Samples for greenhouse gas (methane, carbon dioxide) analysis were collected from Falling Creek Reservoir and Beaverdam Reservoir during the ice-free period (March - November) for 2016 - 2018 from the deepest site in each reservoir. Samples were collected from several depths including: 0.1, 1.6, 3.8, 5.0, 6.2, 8.0 and 9.0 m in Falling Creek Reservoir and 0.1, 3.0, 6.0, 9.0, and 11.0 m for Beaverdam Reservoir. These sampling depths were chosen to approximately match outtake valves in Falling Creek Reservoir. Samples were collected monthly in March-April and September-November and twice weekly for Falling Creek Reservoir and weekly from Beaverdam Reservoir from May-August. Samples were collected with a 4-L Van Dorn sampler (Wildlife Supply, Yulee, FL, USA) and transferred to into two replicate 20 mL glass vials without exposure to air and crimp sealed. Samples were stored on ice and analyzed within 24 hours of collection following McClure et al. (2018).

Methane and carbon dioxide concentrations were measured in each sample on a Gas Chromatograph (GC) with a Flame Ionization Detector (FID) and Thermal Conductivity Detector (TCD) following McClure et al. (2018). Briefly, immediately prior to analysis, a 2-mL headspace was created with Helium (He) by displacing 2-mL of sample water. The headspace was equilibrated by shaking each 20-mL vial at 300 rpm for 15 minutes. The 2-mL headspace was then injected into the GC (SRI, Model 8010). The oven temperature was set to 35 degrees C with a carrier gas (He) flow rate of 15 mL/min. CH4 had a retention time of 1.3 min on the FID and CO2 had a retention time of 2.8 min on the TCD. Dissolved concentrations of CH4 and CO2 in water were calculated using the observed head-space concentrations and Henry's Law (McClure et al. 2018). The median percent difference between replicates was 11.2%.

Replicates of each sample were assessed after sample analysis using calculated percent difference between replicate samples. Samples with <30% difference were considered acceptable and both replicates were retained for analysis (flagged as '1', denoting no problems with replicates). If the percent difference between samples was >30% and <50% then the replicates were flagged but were still both used for analysis (flagged as '2', replicates retained but were high). If samples were >50%, then the replicate with the largest difference between the samples collected at depths above and below was removed and only one replicate was used for analysis (flagged as '3', only one replicate retained). Thus, both replicates are reported for flags 1 and 2 but not for flag 3. If no sample was collected or there were issues with the GC analysis, samples were flagged as '4'.

McClure R.P., Hamre K.D., Niederlehner B.R., Munger Z.W., Chen S., Lofton M.E., Schreiber M.E., Carey C.C. (2018). Metalimnetic oxygen minima alter the vertical profiles of carbon dioxide and methane in a managed freshwater reservoir. Science of the Total Environment, 636. pp. 610-620. https://doi.org/10.1016/j.scitotenv.2018.04.255

People and Organizations

Creators:

Individual:

Cayelan C. Carey

Organization:

Virginia Tech

Email Address:

Cayelan@vt.edu

Id:

https://orcid.org/0000-0001-8835-4476

Individual:

Ryan P. McClure

Organization:

Virginia Tech

Email Address:

ryan333@vt.edu

Id:

https://orcid.org/0000-0001-6370-3852

Individual:

Barbara R. Niederlehner

Organization:

Virginia Tech

Email Address:

bniederl@vt.edu

Individual:

Mary E. Lofton

Organization:

Virginia Tech

Email Address:

melofton@vt.edu

Id:

https://orcid.org/0000-0003-3270-1330

Individual:

Alexandria G. Hounshell

Organization:

Virginia Tech

Email Address:

alexgh@vt.edu

Id:

https://orcid.org/0000-0003-1616-9399

Contacts:

Individual:

Cayelan C. Carey

Organization:

Virginia Tech

Email Address:

Cayelan@vt.edu

Id:

https://orcid.org/0000-0001-8835-4476

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period

Begin:

2016-03-23

End:

2018-10-29

Geographic Region:

Description:

Beaverdam Reservoir is located in Vinton, Virginia, USA

Bounding Coordinates:

Northern:	37.322865	Southern:	37.311961
Western:	-79.824834	Eastern:	-79.813848

Geographic Region:

Description:

Falling Creek Reservoir is located in Vinton, Virginia, USA

Bounding Coordinates:

Northern:	37.309589	Southern:	37.30266
Western:	-79.839249	Eastern:	-79.836009

Project

Parent Project Information:

Title:

No project title to report

Personnel:

Individual:

Cayelan C. Carey

Organization:

Virginia Tech

Email Address:

Cayelan@vt.edu

Id:

https://orcid.org/0000-0001-8835-4476

Role:

Principal Investigator

Funding:

Western Virginia Water Authority

Related Project:

Title:

Dynamics of coupled P-Fe-Mn cycling in drinking water reservoirs and implications for water quality

Personnel:

Individual:

Cayelan C. Carey

Organization:

Virginia Tech

Email Address:

Cayelan@vt.edu

Id:

https://orcid.org/0000-0001-8835-4476

Role:

Principal Investigator

Funding:

Institute of Critical Technology and Applied Science

Related Project:

Title:

SCC-IRG Track 2: Resilient Water Systems: Integrating Environmental Sensor Networks and Real-Time Forecasting to Adaptively Manage Drinking Water Quality an Build Social Trust

Personnel:

Individual:

Cayelan C. Carey

Organization:

Virginia Tech

Email Address:

Cayelan@vt.edu

Id:

https://orcid.org/0000-0001-8835-4476

Role:

Principal Investigator

Funding:

National Science Foundation 1737424

Related Project:

Title:

Collaborative Research: Consequences of changing oxygen availability for carbon cycling in freshwater ecosystems

Personnel:

Individual:

Cayelan C. Carey

Organization:

Virginia Tech

Email Address:

Cayelan@vt.edu

Id:

https://orcid.org/0000-0001-8835-4476

Role:

Principal Investigator

Funding:

National Science Foundation 1753639

Maintenance

Maintenance:

Description:	ongoing
Frequency:

Other Metadata

Additional Metadata

additionalMetadata
        |___text '\n    '
        |___element 'metadata'
        |     |___text '\n      '
        |     |___element 'unitList'
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'id' = 'micromolePerLiter'
        |     |     |     |  \___attribute 'multiplierToSI' = '1.00E-06'
        |     |     |     |  \___attribute 'name' = 'micromolePerLiter'
        |     |     |     |  \___attribute 'parentSI' = 'molarity'
        |     |     |     |  \___attribute 'unitType' = 'amountOfSubstanceConcentration'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'micromole per liter'
        |     |     |     |___text '\n        '
        |     |     |___text '\n      '
        |     |___text '\n    '
        |___text '\n  '

Copyright 2024 Environmental Data Initiative. This material is based upon work supported by the National Science Foundation under grants #2223103 and #2223104. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Please contact us with questions, comments, or for technical assistance regarding this web site or the Environmental Data Initiative. Please read our privacy policy to know what information we collect about you and to understand your privacy rights.

EDI is a collaboration between the University of New Mexico and the University of Wisconsin – Madison, Center for Limnology:

Data Package Metadata View Summary

Time series of dissolved methane and carbon dioxide concentrations for Falling Creek Reservoir and Beaverdam Reservoir in southwestern Virginia, USA during 2016-2018

Data Entities

Data Table

Data Package Usage Rights

Keywords

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Parent Project Information:

Maintenance

Additional Metadata

Recently Added

Recently Updated

Data Package Metadata View Summary

Time series of dissolved methane and carbon dioxide concentrations for Falling Creek Reservoir and Beaverdam Reservoir in southwestern Virginia, USA during 2016-2018

+/- Data Entities

Data Table

+/- Data Package Usage Rights

+/- Keywords

+/- Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

+/- People and Organizations

+/- Temporal, Geographic and Taxonomic Coverage

+/- Project

Parent Project Information:

+/- Maintenance

+/- Additional Metadata

Data Entities

Data Package Usage Rights

Keywords

Methods and Protocols

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Maintenance

Additional Metadata