Data Package Metadata View Summary

Time series of methane and carbon dioxide diffusive fluxes using an Ultraportable Greenhouse Gas Analyzer (UGGA) for Falling Creek Reservoir and Beaverdam Reservoir in southwestern Virginia, USA during 2018–2021

General Information

Data Package:

Local Identifier:

edi.704.1

Title:

Time series of methane and carbon dioxide diffusive fluxes using an Ultraportable Greenhouse Gas Analyzer (UGGA) for Falling Creek Reservoir and Beaverdam Reservoir in southwestern Virginia, USA during 2018–2021

Alternate Identifier:

DOI PLACE HOLDER

Abstract:

Diffusive fluxes of methane and carbon dioxide were measured using an Ultraportable Greenhouse Gas Analyzer (UGGA) in Falling Creek Reservoir (FCR) and Beaverdam Reservoir (BVR; Vinton, Virginia, USA). FCR and BVR are owned and operated by the Western Virginia Water Authority as drinking water sources for Roanoke, Virginia. The dataset consists of calculated diffusive fluxes of methane and carbon dioxide measured at the deepest site of the reservoir adjacent to the dam (2018–2021) and additional upstream sites in FCR (2018). Measurements were collected approximately fortnightly in FCR throughout the stratified periods of 2018–2021, while measurements from BVR were only taken in 2018.

Publication Date:

2022-01-12

For more information:
Visit:	DOI PLACE HOLDER

Time Period

Begin:

2018-05-07

End:

2021-04-26

People and Organizations
Contact:	Carey, Cayelan C. (Virginia Tech) [ email ]
Creator:	Carey, Cayelan C. (Virginia Tech)
Creator:	Lewis, Abigail S. L. (Virginia Tech)
Creator:	Hounshell, Alexandria G. (Virginia Tech)
Creator:	McClure, Ryan P. (Virginia Tech)
Creator:	Breef-Pilz, Adrienne (Virginia Tech)

Data Entities
Data Table Name:	UGGA dataset 2018-2021
Description:	UGGA diffusive flux dataset from FCR and BVR
Other Name:	Raw UGGA files and code
Description:	Raw data from the Ultraportable Greenhouse Gas Analyzer and code used to translate these data into the diffusive flux rates presented in this data table
Other Name:	Data compilation and publishing script
Description:	Code used to compile and QAQC all years of UGGA data, then publish to EDI

Detailed Metadata

Data Entities

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/edi/704/1/fbf896558989873ef6f5385ba806772b
Name:	UGGA dataset 2018-2021
Description:	UGGA diffusive flux dataset from FCR and BVR
Number of Records:	184
Number of Columns:	15

Table Structure

Object Name:

UGGA_2018_2021.csv

Size:

15520 bytes

Authentication:

4960017b00ce25eb4716ea97dbc47ec2 Calculated By MD5

Text Format:

Number of Header Lines:

Record Delimiter:

Orientation:

column

Simple Delimited:

Field Delimiter:

Table Column Descriptions

Column Name:

Reservoir

Site

Date

Rep

Start_time

End_time

Temp_C

co2_slope_ppmS

co2_R2

co2_flux_umolCm2s

ch4_slope_ppmS

ch4_R2

ch4_flux_umolCm2s

co2_flux_umolCm2s_flag

ch4_flux_umolCm2s_flag

Definition:

Three-letter code corresponding to sampled reservoir

Sampling site within each reservoir. 50=Deep hole or site nearest to dam in each reservoir, 45=Transect 45 in Falling Creek Reservoir, 30=Transect 30 in Falling Creek Reservoir, 20=Transect 20 in Falling Creek Reservoir, 10=Transect 10 in Falling Creek Reservoir. On transects 45, 40, 30, 20, and 10 in Falling Creek Reservoir, measurements were collected at the deepest site of the reservoir. For a map of the transects in Falling Creek Reservoir, see Chen et al. 2017

Date of sampling

Replicate sample number. Samples are coded as either 1 or 2 for the first and second sampling period, respectively.

Start time for diffusive flux calculations, typically defined as 4 minutes before the visually identified end time using FluxCalR. All data were collected in the eastern time zone of the U.S.A.

End time for diffusive flux calculations as visually identified using the FluxCalR package. All data were collected in th eastern time zone of the U.S.A.

Averaged ambient temperature from the measurement time period used to calculate diffusive fluxes in FluxCalR.

Slope of CO2 concentration over time, calculated using FluxCalR

R2 for the calculated slope for CO2 concentration

Diffusive CO2 flux

Slope of CH4 concentration over time, calculated using FluxCalR

R2 for the calculated slope for CH4 concentration

Diffusive CH4 flux

Flag for diffusive CO2 flux. 0 = No issues; 1 = Replicate not measured

Flag for diffusive CH4 flux. 0 = No issues; 1 = Replicate not measured

Storage Type:

string

float

date

float

date

float

Measurement Type:

nominal

ratio

dateTime

ratio

dateTime

ratio

Measurement Values Domain:

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	10
Max	50

Format	YYYY-MM-DD
Precision

Unit	dimensionless
Type	natural
Min	1
Max	2

Format	hh:mm:ss
Precision

Format	hh:mm:ss
Precision

Unit	celsius
Type	real
Min	16.02
Max	42

Unit	partsPerMillionPerSecond
Type	real
Min	-0.078
Max	1.528

Unit	dimensionless
Type	real
Min	0.09
Max	1

Unit	micromolePerMeterSquaredPerSecond
Type	real
Min	-0.447
Max	8.832

Unit	partsPerMillionPerSecond
Type	real
Min	-0.003
Max	0.064

Unit	dimensionless
Type	real
Min	0.01
Max	1

Unit	micromolePerMeterSquaredPerSecond
Type	real
Min	-0.018
Max	0.388

Unit	dimensionless
Type	whole
Min	0
Max	0

Unit	dimensionless
Type	whole
Min	0
Max	0

Missing Value Code:

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Non-Categorized Data Resource

Name:

Raw UGGA files and code

Entity Type:

unknown

Description:

Raw data from the Ultraportable Greenhouse Gas Analyzer and code used to translate these data into the diffusive flux rates presented in this data table

Physical Structure Description:

Object Name:

RawData.zip

Size:

3387249 bytes

Authentication:

e93d5885c49dc1ed71cda4e12724e359 Calculated By MD5

Externally Defined Format:

Format Name:

application/zip

Data:

https://pasta-s.lternet.edu/package/data/eml/edi/704/1/bd75848e651c815316ca9f5ca1652a47

Non-Categorized Data Resource

Name:

Data compilation and publishing script

Entity Type:

unknown

Description:

Code used to compile and QAQC all years of UGGA data, then publish to EDI

Physical Structure Description:

Object Name:

Flux_compilation.Rmd

Size:

2868 bytes

Authentication:

2a418808d8857011d45c34970eed27bd Calculated By MD5

Externally Defined Format:

Format Name:

text/x-markdown

Data:

https://pasta-s.lternet.edu/package/data/eml/edi/704/1/ece6a05cfc373d38b0a637bd3ef99019

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:
(No thesaurus)	greenhouse gas emissions, Virginia Tech, Stream Team, Western Virginia Water Authority, Falling Creek Reservoir, Beaverdam Reservoir, reservoir, lake, methane, carbon dioxide, diffusive flux, diffusion

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:

Diffusive fluxes for methane and carbon dioxide were collected using the floating chamber method (Galfalk et al. 2013; McClure et al. 2020). Following McClure et al. 2020, the flux chamber was constructed using an opaque bucket fitted with foam and wrapped with reflective aluminum tape to prevent internal heating. The volume of the bucket was 0.02 meters cubed with an area of 0.15 meters squared. The fitted foam allowed the chamber to sit approximately 3 cm below the water surface and sealed the inside of the chamber from the surrounding air. The chamber was connected to a Los Gatos ultraportable GHG analyzer (UGGA: Los Gatos Research Inc., San Jose, CA, USA) through two air-tight gas ports which were fitted to the top of the chamber and connected to two separate three-meter sections of 0.635-cm Tygon PVC tubing before being connected to the inlet and waste valves on the UGGA. Air was circulated through the chamber at approximately 405 mL per minute. The moisture corrected methane and carbon dioxide (ppm) were recorded every 10 seconds. The chamber was vented until atmospheric concentrations were reached before being lowered to the water’s surface where 5 minutes of data were collected. This was repeated twice at the deepest site (Site 50) for two replicate measurements per day.

Diffusive fluxes (methane, carbon dioxide) were calculated from the collected UGGA concentrations using the FluxCalR package (Zhao, 2019). Briefly, peaks for methane concentration were visually identified for each day and each replicate and served as the end time point for slope calculation (CO2 and CH4, respectively). The slope of carbon dioxide/methane concentration was then calculated for 4 minutes prior to the identified end time point. The slope was converted to diffusive flux assuming 1 atmosphere of pressure and averaging the ambient temperature over the entire measurement period.

References:

Galfalk, M., Bastviken, D., Fredriksson, S., & Arneborg, L. (2013). Determination of the piston velocity for water‐air interfaces using flux chambers, acoustic Doppler velocimetry, and IR imaging of the water surface. J. Geophys. Res. Biogeosci., 118(2), 770-782. https://doi.org/10.1002/jgrg.20064

McClure, R.P., M.E. Lofton, S. Chen, K.M. Krueger, J.C. Little, and C.C. Carey. 2020. Methane ebullition and diffusion rates, turbulence, water temperature, and water depth data from Falling Creek Reservoir (Virginia, USA) in the ice-free period during 2016-2019 ver 2. Environmental Data Initiative. https://doi.org/10.6073/pasta/c6b1a54e356f5ab093d86dcdb89177ba

Zhao, J (2019). FluxCalR: a R package for calculating CO2 and CH4 fluxes from static chambers. Journal of Open Source Software, 4(43), 1751, https://doi.org/10.21105/joss.01751

Additional notes:

In 2020, multiple whole-ecosystem manipulations were conducted at Falling Creek Reservoir. These manipulations include intermittent operation of hypolimnetic oxygenation and pulsed epilimnetic mixing engineering systems. For a detailed description of the hypolimnetic oxygenation engineered system, see Gerling et al. (2014) and for a detailed description of the epilimnetic mixing engineered system, see Chen et al. (2017).

Chen, S., C. Lei, C.C. Carey, P.A. Gantzer, and J.C. Little. 2017. Predicting hypolimnetic oxygenation and epilimnetic mixing in a shallow eutrophic reservoir using a coupled three-dimensional hydrodynamic model. Water Resources Research. 53: 470-484. DOI: 10.1002/2016WR019279

Gerling, A.B., Browne, R.G., Gantzer, P.A., Mobley, M.H., Little, J.C., and C.C. Carey. 2014. First report of the successful operation of a side stream supersaturation hypolimnetic oxygenation system in a eutrophic, shallow reservoir. Water Research. 67: 129-143. doi: 10.1016/j.watres.2014.09.002

People and Organizations

Publishers:

Organization:

Environmental Data Initiative

Email Address:

info@environmentaldatainitiative.org

Web Address:

https://environmentaldatainitiative.org

Id:

https://ror.org/0330j0z60

Creators:

Individual:

Cayelan C. Carey

Organization:

Virginia Tech

Email Address:

cayelan@vt.edu

Id:

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

Individual:

Abigail S. L. Lewis

Organization:

Virginia Tech

Email Address:

aslewis@vt.edu

Id:

https://orcid.org/0000-0001-9933-4542

Individual:

Alexandria G. Hounshell

Organization:

Virginia Tech

Email Address:

alexgh@vt.edu

Id:

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

Individual:

Ryan P. McClure

Organization:

Virginia Tech

Email Address:

ryan333@vt.edu

Id:

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

Individual:

Adrienne Breef-Pilz

Organization:

Virginia Tech

Email Address:

abreefpilz@vt.edu

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:

2018-05-07

End:

2021-04-26

Geographic Region:

Description:

Beaverdam Reservoir is located in Vinton, Virginia, USA

Bounding Coordinates:

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

Geographic Region:

Description:

Falling Creek Reservoir is located in Vinton, Virginia, USA

Bounding Coordinates:

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

Project

Parent Project Information:

Title:

N/A

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 N/A

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 N/A

Related Project:

Title:

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

Additional Info

Additional Information:

Author contributions:

CCC developed and led the reservoir monitoring program 2013-present, and oversaw UGGA purchasing, use, and maintenance throughout this time. ASL is the point person for 2018-2021 data collation, QAQC, and publishing. AGH was the point person for UGGA data collection in 2020 and developed an automated QAQC script for UGGA data processing. RPM was the point person for UGGA data collection from 2018–2019. ABP is a collaborator on the 2021 publication because she was the 2021 field season lead and assisted in UGGA maintenance.

Other Metadata

Additional Metadata

additionalMetadata
        |___text '\n    '
        |___element 'metadata'
        |     |___text '\n      '
        |     |___element 'unitList'
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'id' = 'partsPerMillionPerSecond'
        |     |     |     |  \___attribute 'multiplierToSI' = 'percent/10000/second'
        |     |     |     |  \___attribute 'name' = 'partsPerMillionPerSecond'
        |     |     |     |  \___attribute 'parentSI' = 'percent, second'
        |     |     |     |  \___attribute 'unitType' = 'concentration rate'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'rate of change in concentration (ppm/s)'
        |     |     |     |___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 methane and carbon dioxide diffusive fluxes using an Ultraportable Greenhouse Gas Analyzer (UGGA) for Falling Creek Reservoir and Beaverdam Reservoir in southwestern Virginia, USA during 2018–2021

Data Entities

Data Table

Non-Categorized Data Resource

Non-Categorized Data Resource

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 Info

Additional Metadata

Recently Added

Recently Updated

Data Package Metadata View Summary

Time series of methane and carbon dioxide diffusive fluxes using an Ultraportable Greenhouse Gas Analyzer (UGGA) for Falling Creek Reservoir and Beaverdam Reservoir in southwestern Virginia, USA during 2018–2021

+/- Data Entities

Data Table

Non-Categorized Data Resource

Non-Categorized Data Resource

+/- 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 Info

+/- Additional Metadata

Data Entities

Data Package Usage Rights

Keywords

Methods and Protocols

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Maintenance

Additional Info

Additional Metadata