Instantaneous fluxes of carbon dioxide (CO2) and methane (CH4) of six European coastal wetlands under different ecological
status measured seasonally with static chambers
This dataset includes instantaneous fluxes of CO2 and CH4 for 3043 individual incubations, performed under transparent and dark light-conditions in 2123 distinct deployments of static greenhouse gas chambers. Three different flux estimates (linear, non-linear and 2-point) are provided for each incubation and gas, accompanied by a selection of best-flux estimate based on systematic criteria of estimate-quality metrics (also included). Fluxes were measured in-situ, using static chambers coupled with portable greenhouse gas analyzers. Spatially, the dataset contains fluxes of 36 different sites, corresponding to 6 different casepilot wetlands and 3 conservation status (altered, preserved, restored), that is two sites per wetland-conservation status combination. In each site, measurements were performed during four seasonal samplings covering Autum 2023 through Summer 2024. Within each site, static chamber measurements were taken proportionally to the areal cover of three strata categories: vegetated, open water and bare sediment/soil. Sampling contextual information (light-condition of chamber, geographical coordinates, time of measurement, water depth, vegetation description and aboveground vegetation biomass) is also included for every incubation. <span data-teams="true">This dataset is currently under embargo period and it will be available after the 31/12/2027.</span>
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IdentificationAbout this resource
- Alternate Identifier
-
9c36be45-cc4b-4df3-a611-599aa7e60d29
- Publication Date
- 2028-01-01
- Title
-
Instantaneous fluxes of carbon dioxide (CO2) and methane (CH4) of six European coastal wetlands under different ecological status measured seasonally with static chambers
- Abstract
-
This dataset includes instantaneous fluxes of CO2 and CH4 for 3043 individual incubations, performed under transparent and dark light-conditions in 2123 distinct deployments of static greenhouse gas chambers. Three different flux estimates (linear, non-linear and 2-point) are provided for each incubation and gas, accompanied by a selection of best-flux estimate based on systematic criteria of estimate-quality metrics (also included). Fluxes were measured in-situ, using static chambers coupled with portable greenhouse gas analyzers. Spatially, the dataset contains fluxes of 36 different sites, corresponding to 6 different casepilot wetlands and 3 conservation status (altered, preserved, restored), that is two sites per wetland-conservation status combination. In each site, measurements were performed during four seasonal samplings covering Autum 2023 through Summer 2024. Within each site, static chamber measurements were taken proportionally to the areal cover of three strata categories: vegetated, open water and bare sediment/soil. Sampling contextual information (light-condition of chamber, geographical coordinates, time of measurement, water depth, vegetation description and aboveground vegetation biomass) is also included for every incubation. <span data-teams="true">This dataset is currently under embargo period and it will be available after the 31/12/2027.</span>
- Dataset Language
-
English
- Dataset Creator
- Dataset Creator
- Dataset Creator
- Dataset Creator
- Dataset Creator
- Dataset Creator
- Metadata Provider
- Metadata Provider
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- Dataset Contact
- Dataset Contact
- Dataset Contact
- Keywords (Biodiversity Thesaurus)
-
-
ecological restoration
-
- Keywords (Environmental Thesaurus)
-
-
greenhouse gas fluxes
-
carbon dioxide
-
methane
-
wetland
-
Geographic Coverage
- Geographic Description
-
Danube Delta
Bounding Box
- West Bounding Coordinate
-
28.2843
- East Bounding Coordinate
-
29.7459
- North Bounding Coordinate
-
45.4723
- South Bounding Coordinate
-
44.8032
Geographic Coverage
- Geographic Description
-
Ria de Aveiro
Bounding Box
- West Bounding Coordinate
-
-8.72507
- East Bounding Coordinate
-
-8.59663
- North Bounding Coordinate
-
40.74963
- South Bounding Coordinate
-
40.63271
Geographic Coverage
- Geographic Description
-
Marjal dels moros
Bounding Box
- West Bounding Coordinate
-
-0.27997
- East Bounding Coordinate
-
-0.240362
- North Bounding Coordinate
-
39.64107
- South Bounding Coordinate
-
39.61579
Geographic Coverage
- Geographic Description
-
Curonian lagoon
Bounding Box
- West Bounding Coordinate
-
20.5142
- East Bounding Coordinate
-
21.2653
- North Bounding Coordinate
-
55.7186
- South Bounding Coordinate
-
54.8743
Geographic Coverage
- Geographic Description
-
Camargue
Bounding Box
- West Bounding Coordinate
-
4.4382
- East Bounding Coordinate
-
4.9275
- North Bounding Coordinate
-
43.674
- South Bounding Coordinate
-
43.3229
Geographic Coverage
- Geographic Description
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Dutch wetlands
Bounding Box
- West Bounding Coordinate
-
3.9907
- East Bounding Coordinate
-
4.4087
- North Bounding Coordinate
-
51.6811
- South Bounding Coordinate
-
51.2754
Temporal Coverage
Range of Dates
- Begin Date
-
2023-10-03
- End Date
-
2024-08-01
resourceLicensesLicense Information
- Intellectual Rights
Resource License
- License Name
-
cc-by-nc-sa
Distribution
Online
- A brief description of the the content of online URL.
-
DOI
Project
• Project
- Title
-
RESTORE4Cs - Modelling RESTORation of wEtlands for Carbon pathways, Climate Change mitigation and adaptation, ecosystem services, and biodiversity, Co-benefits
Personnel
Individual Name
- Given Name
-
Miguel
- Surname
-
Cabrera Brufau
- Organization Name
-
Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Universitat de Barcelona (UB)
- Position Name
-
PostDoc
- User ID
-
0000-0002-0740-9306
- Role
-
Point Of Contact
Personnel
Individual Name
- Given Name
-
Benjamin
- Surname
-
Misteli
- Organization Name
-
WasserCluster Lunz - Biologische Station
- Position Name
-
PostDoc
- User ID
-
0000-0002-7733-4354
- Role
-
Point Of Contact
Personnel
Individual Name
- Given Name
-
Antonio
- Surname
-
Camacho
- Organization Name
-
University of Valencia
- Position Name
-
Full professor
- User ID
-
0000-0003-0841-2010
- Role
-
Point Of Contact
- Abstract
- Funding
Methods
• Method
Method Step
- Description
-
Static chamber measurements: In each designated spot a static chamber was placed (cylindrical or semi-spherical, transparent or opaque, depending on the spot presence of vegetation and water) and immediately after placement, CO2 and CH4 gas concentration timeseries were synchronously recorded for a duration of 5 to 12 minutes using a portable gas analyzer. Incubation-related information was recorded in a field-sheet and later digitalized (Incubation ID, date, season, casepilot, site, GPS coordinates, start time, end time, vegetation presence, vegetation type, water depth, chamber type and dimensions, light conditions, instrument used, personnel performing the incubation, general observations and incidences during incubation).
Method Step
- Description
-
Import of raw data and mapping of incubations: Raw GHG concentration timeseries data was downloaded from the portable gas analyzers alongside (if available) the instrument-recorded start-end time of each incubation. For each incubation, manually annotated incubation start-end times were combined with those recorded by instrument (if any). Each individual incubation was visually inspected, and the start-end times were adjusted appropriately in cases where this inspection revealed mismatches between recorded start-end times and GHG concentration patterns consistent with closing and opening of the chamber. Additionally, the presence of patterns of ebullitive behavior for methane concentration timeseries were recorded for each incubation for later use. Meteorological information needed for the flux estimates calculation was collected from nearby meteorological stations.
Method Step
- Description
-
Flux estimates calculations: Briefly, for each CO2 and CH4 gas concentration time series, three different flux estimates of were calculated (total.flux, LM, HM). Total.flux estimate was calculated as the net concentration change throughout the incubation using the average (10 s) initial and final concentrations. Linear (LM) and non-linear (HM) (Hutchinson and Mosier, 1981) regression models were used to obtain a linear and a nonlinear flux estimate using the goFlux R package v2.0.0 (Rheault et al., 2024). Areal molar fluxes were calculated for each of the three approaches via the ideal gas equation using the chamber footprint area and effective volume recorded in the field, and initial temperature and atmospheric pressure recorded by the nearest meteorological station.
Method Step
- Description
-
Selection of best flux estimate: Selection of best flux estimate followed objective sequential criteria based on model performance statistics (inspired by goFlux R package best.flux function) and, for methane flux estimates, the presence of ebullitive patterns recorded during visual inspection. Selection procedure: First, all methane timeseries with visual evidence of ebullition (recorded during previous inspection) were assigned to the total.flux estimate unless the linear model presented and R2 above 0.99 (LM.r2 higher than 0.99). For the rest of the timeseries, absent of ebullitive patterns, the HM model was chosen only when all the following criteria were met (defaulting to the LM estimate when one or more were violated): HM model produces a valid flux estimate (HM.flux ≠ NA). LM flux estimate is above the minimal detectable flux (Christiansen et al., 2015). HM curvature parameter Kappa is below the theoretical maximum (Hüppi et al., 2018). The ratio between the non-linear (HM) flux estimate and the linear (LM) estimate, the g-fact (Hüppi et al., 2018) is below the gas species-specific custom threshold (CO2 g-fact less than 4; CH4 g-fact less than 3). Akaike Information Criterion corrected for small sample size (AICc) of HM model is lower than that of the LM model. Mean absolute error (MAE) of HM model is at least 5% lower than that of LM model. The raw GHG concentration timeseries and accessory data required for flux calculation can be found in https://doi.org/10.5281/zenodo.18803756. The code used for flux calculation and estimate selection is deposited at https://doi.org/10.5281/zenodo.19184152.
Data Tables
• Data Table
- Name
-
Deployments_contextual_field_Information.csv
- Description
-
Dataset of static chamber deployments. Contains contextual sampling information associated with each deployment of a static chamber. Each deployment corresponds to either one or two incubations identified by a dark or transparent UniqueID code and for which instantaneous GHG fluxes are provided in the other data tables.
Physical
- Object Name
-
Deployments_contextual_field_Information.csv
- Size
-
342778
- Authentication
-
MD5:71b99a23144103875bb4a61afa601f11
- Character Encoding
-
UTF-8
Data Format
- textFormat
-
1
column
,
Attribute List
Attribute
- Name
-
parentEventID
- Label
-
Parent Event ID
- Definition
-
Code that identifies the deployment of a static chamber. A single parentEventID chamber deployment code can correspond to up to two chamber incubations (darkUniqueID and transparentUniqueID) performed under dark or transparent light-conditions, while sharing the exact same position and other contextual information.
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
Attribute
- Name
-
season
- Label
-
Season
- Definition
-
Code that identifies the season (S1: Autumn, S2: Winter, S3: Spring, S4: Summer).
Measurement Scale
nominal
nonNumericDomain
enumeratedDomain
- codeDefinition
-
S1
Autumn
-
- codeDefinition
-
S2
Winter
-
- codeDefinition
-
S3
Spring
-
- codeDefinition
-
S4
Summer
-
Attribute
- Name
-
higherGeography
- Label
-
Higher Geography
- Definition
-
Full name of wetland casepilot where measurement was taken.
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
Attribute
- Name
-
locationID
- Label
-
Location ID
- Definition
-
Code that identifies the location (the wetland "unit") where the measurement was taken. Coded as a combination of the casepilot (higherGeography) abreviation and one of "A1", "A2", "P1", "P2", "R1" or "R2". Letters A, P, R followed by number correspond to the ecological status classification of the locations (A=Altered, P=Preserved, R= Restored).
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
Attribute
- Name
-
eventDate
- Label
-
Event Date
- Definition
-
The date-time or interval during which a dwc:Event occurred.
Measurement Scale
Date time
- Format String
-
YYYY-MM-DD
Attribute
- Name
-
eventTime
- Label
-
Event Time
- Definition
-
Time (hh:mm:ss, UTC) at which the first incubation started (regardless of subsequent incubations for the same chamber deployment).
Measurement Scale
Date time
- Format String
-
hh:mm:ss
Attribute
- Name
-
decimalLatitude
- Label
-
Decimal Latitude
- Definition
-
The geographic latitude (in decimal degrees, using the spatial reference system given in dwc:geodeticDatum) of the geographic center of a dcterms:Location. Positive values are north of the Equator, negative values are south of it. Legal values lie between -90 and 90, inclusive.
Measurement Scale
Ratio
Unit
- standardUnit
-
degree
Numeric domain
- Number type
-
real
Attribute
- Name
-
decimalLongitude
- Label
-
Decimal Longitude
- Definition
-
The geographic longitude (in decimal degrees, using the spatial reference system given in dwc:geodeticDatum) of the geographic center of a dcterms:Location. Positive values are east of the Greenwich Meridian, negative values are west of it. Legal values lie between -180 and 180, inclusive.
Measurement Scale
Ratio
Unit
- standardUnit
-
degree
Numeric domain
- Number type
-
real
Attribute
- Name
-
gasAnalyzer
- Label
-
Gas Analyser
- Definition
-
Code of the gas analyzer model used to record greenhouse gas concentration during the incubation.
Measurement Scale
nominal
nonNumericDomain
enumeratedDomain
- codeDefinition
-
LI-COR
Li-COR 7810
-
- codeDefinition
-
Picarro
Picarro G4301
-
- codeDefinition
-
Los Gatos
GLA132-GGA
-
Attribute
- Name
-
strata
- Label
-
Strata
- Definition
-
Classification of the type of surface cover where the chamber was deployed (vegetated, open water or bare).
Measurement Scale
nominal
nonNumericDomain
enumeratedDomain
- codeDefinition
-
vegetated
Area covered by vegetation regardless of water presence
-
- codeDefinition
-
open water
Areas without emergent vegetation and with water of more than 10 cm depth
-
- codeDefinition
-
bare
Areas where sediment/soil is exposed to the atmoshpere without water or vegetation
-
Attribute
- Name
-
waterDepth
- Label
-
Water Depth
- Definition
-
Water depth where the chamber was deployed.
Measurement Scale
Ratio
Unit
- standardUnit
-
centimeter
Numeric domain
- Number type
-
real
Attribute
- Name
-
fieldNotes
- Label
-
Field Notes
- Definition
-
Harmonised observations made in the field, contextual for the deployment (humidity of sediment, presence of submerged vegetation, tide behaviour,…)
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
Attribute
- Name
-
ABGVegDescription
- Label
-
Aboveground Vegetation Description
- Definition
-
Description of aboveground vegetation inside the chamber. Contains identification at different taxonomic levels (species, genus, non-systematic names, separated by semi-colons ";") and (when available) visual assessment of plant state within parenthesis. Absence of vegetation is denoted with "no aboveground vegetation".
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
Attribute
- Name
-
ABGVegBiomass
- Label
-
Aboveground Biomass
- Definition
-
Aboveground vegetation dry biomass. Calculated from the dry weight of vegetation inside the chamber and the area covered by the chamber.
Measurement Scale
Ratio
Unit
- standardUnit
-
gramPerMeterSquared
Numeric domain
- Number type
-
real
Attribute
- Name
-
darkUniqueID
- Label
-
Dark Unique ID
- Definition
-
UniqueID code identifying the incubation performed under dark (opaque) light-conditions during the chamber deployment identified by parentEventID. Used as key for identification of CO2 and CH4 flux estimates.
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
Attribute
- Name
-
transparentUniqueID
- Label
-
Transparent Unique ID
- Definition
-
UniqueID identifying the incubation performed under transparent light-conditions during the chamber deployment identified by parentEventID. Used as key for identification of CO2 and CH4 flux estimates.
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
- numberOfRecords
-
2123
• Data Table
- Name
-
Instantaneous_CO2_flux.csv
- Description
-
Dataset of instantaneous carbon dioxide (CO2) flux estimates. Contains three flux estimates (and associated quality parameters) for each static chamber incubation identified with a uniqueID code.
Physical
- Object Name
-
Instantaneous_CO2_flux.csv
- Size
-
1038864
- Authentication
-
MD5:fe46a20f730f8732e8d448c74cf47f4e
- Character Encoding
-
UTF-8
Data Format
- textFormat
-
1
column
,
Attribute List
Attribute
- Name
-
uniqueID
- Label
-
Unique ID
- Definition
-
Code that uniquely identifies a chamber incubation, performed under dark or transparent light conditions. Matches with darkUniqueID or transparentUniqueID columns in Deployments_contextual_field_Information data table.
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
Attribute
- Name
-
duration
- Label
-
Duration
- Definition
-
Duration (in seconds) of GHG concentration timeseries used to obtain flux estimates.
Measurement Scale
Ratio
Unit
- standardUnit
-
second
Numeric domain
- Number type
-
real
Attribute
- Name
-
flux.term
- Label
-
Flux term
- Definition
-
Term used to convert flux untis from change in ppm per second to µmol per square meter per second. It takes into account the chamber geometry (base area and volume) as well as temperature, atmospheric pressure and water vapor concetration inside the chamber at the beginning of the incubation. See: https://qepanna.quarto.pub/goflux/goFlux.html
Measurement Scale
Ratio
Unit
- Custom Unit
-
moles per meter squared
Numeric domain
- Number type
-
real
Attribute
- Name
-
MDF.lim
- Label
-
Minimal Detectable Flux
- Definition
-
Limit under which a flux estimate is considered below the detection limit (depends on instrument accuracy and duration of incubation and chamber geometry).
Measurement Scale
Ratio
Unit
- standardUnit
-
micromolePerMeterSquaredPerSecond
Numeric domain
- Number type
-
real
Attribute
- Name
-
C0.10s
- Label
-
CO2 average concentration
- Definition
-
Average concentration of CO2 gas during the first 10 seconds of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per million
Numeric domain
- Number type
-
real
Attribute
- Name
-
C0.10s.sd
- Label
-
Standard deviation of CO2 average concentration
- Definition
-
Standard deviation of the average concentration of CO2 gas during the first 10 seconds of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per million
Numeric domain
- Number type
-
real
Attribute
- Name
-
Cf.10s
- Label
-
CO2 average concentration
- Definition
-
Average concentration of CO2 gas during the last 10 seconds of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per million
Numeric domain
- Number type
-
real
Attribute
- Name
-
Cf.10s.sd
- Label
-
Standard deviation of CO2 average concentration
- Definition
-
Standard deviation of the average concentration of CO2 gas during the last 10 seconds of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per million
Numeric domain
- Number type
-
real
Attribute
- Name
-
total.flux
- Label
-
Total flux
- Definition
-
Two-point CO2 flux estimate, calculated via the difference between C0.10s and Cf.10s through the duration of the incubation and multiplied by the flux.term value.
Measurement Scale
Ratio
Unit
- standardUnit
-
micromolePerMeterSquaredPerSecond
Numeric domain
- Number type
-
real
Attribute
- Name
-
total.flux.se
- Label
-
Total flux standard error
- Definition
-
Standard error of total.flux.
Measurement Scale
Ratio
Unit
- standardUnit
-
micromolePerMeterSquaredPerSecond
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.flux
- Label
-
Linear Model flux
- Definition
-
Linear CO2 flux estimate. Obtained via Linear regression of CO2 concentration (ppm) through time (duration, s) and multiplied by flux.term value.
Measurement Scale
Ratio
Unit
- standardUnit
-
micromolePerMeterSquaredPerSecond
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.flux.se
- Label
-
Linear Model flux standard error
- Definition
-
Standard error of LM.flux.
Measurement Scale
Ratio
Unit
- standardUnit
-
micromolePerMeterSquaredPerSecond
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.MAE
- Label
-
Linear Model Mean Absolute Error
- Definition
-
Mean Absolute Error of LM model.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per million
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.RMSE
- Label
-
Linear Model Root Mean Square Error
- Definition
-
Root Mean Square Error of LM model.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per million
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.AICc
- Label
-
Linear Model Akaike Information Criterion
- Definition
-
Akaike Information Criterion corrected for small sample size of LM model.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.r2
- Label
-
Linear Model R2
- Definition
-
Coefficient of determination (R-squared) of LM model.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.p.val
- Label
-
Linear Model p-value
- Definition
-
P-value of LM model, test if the slope if statistically different from cero.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.flux
- Label
-
Hutchinson and Mosier model flux
- Definition
-
Non-linear (HM) CO2 flux estimate. Obtained via the application of the Hutchinson and Mosier 1981 flux model, multiplied by flux.term value.
Measurement Scale
Ratio
Unit
- standardUnit
-
micromolePerMeterSquaredPerSecond
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.flux.se
- Label
-
Hutchinson and Mosier model flux standard error
- Definition
-
Standard error of HM.flux.
Measurement Scale
Ratio
Unit
- standardUnit
-
micromolePerMeterSquaredPerSecond
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.MAE
- Label
-
Hutchinson and Mosier model Mean Absolute Error
- Definition
-
Mean Absolute Error of HM model.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per million
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.RMSE
- Label
-
Hutchinson and Mosier model Root Mean Square Error
- Definition
-
Root Mean Square Error of HM model.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per million
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.AICc
- Label
-
Hutchinson and Mosier model Akaike Information Criterion
- Definition
-
Akaike Information Criterion corrected for small sample size of HM model.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.r2
- Label
-
Hutchinson and Mosier model R2
- Definition
-
Coefficient of determination (R-squared) of HM model.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.k
- Label
-
Hutchinson and Mosier model K
- Definition
-
Kappa of HM model. Determines the curvature of the model. A large kappa returns a strong curvature.
Measurement Scale
Ratio
Unit
- Custom Unit
-
inverse second
Numeric domain
- Number type
-
real
Attribute
- Name
-
k.max
- Label
-
K max
- Definition
-
Maximum limit for the kappa (HM.K) curvature parameter. Estimated from the LM.flux, the MDF.lim and the duration of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
Inverse second
Numeric domain
- Number type
-
real
Attribute
- Name
-
g.fact
- Label
-
g factor
- Definition
-
Ratio between a the non-linear flux estimate (HM.flux) and the linear flux estimate (LM.flux).
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
best.model
- Label
-
Best Model
- Definition
-
Name of the flux estimate (LM, HM, total.flux, None appropriate) that is considered to be best (based on objective criteria of model performance). “None appropriate” code indicates incubations with severe artefacts, precluding the selection of any flux estimate for them.
Measurement Scale
nominal
nonNumericDomain
enumeratedDomain
- codeDefinition
-
LM
Linear Model
-
- codeDefinition
-
HM
Hutchinson and Mosier model
-
- codeDefinition
-
total.flux
Two point estimate
-
- codeDefinition
-
None appropriate
Artefacts preclude reliable flux estimation
-
Attribute
- Name
-
best.model.flags
- Label
-
Best Model Flags
- Definition
-
Main reason or reasons for the selection of best.model. Includes flags for the failure of various objective conditions that determine which model estimate (LM, HM total.flux) is considered to be the most appropriate.
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
- numberOfRecords
-
3042
• Data Table
- Name
-
Instantaneous_CH4_flux.csv
- Description
-
Dataset of instantaneous methane (CH4) flux estimates. Contains three flux estimates (and associated quality parameters) for each static chamber incubation identified with a uniqueID code.
Physical
- Object Name
-
Instantaneous_CH4_flux.csv
- Size
-
1036925
- Authentication
-
MD5:5e3caeab87f182e44589e51c4c002abc
- Character Encoding
-
UTF-8
Data Format
- textFormat
-
1
column
,
Attribute List
Attribute
- Name
-
UniqueID
- Label
-
Unique ID
- Definition
-
Code that uniquely identifies a chamber incubation, performed under dark or transparent light conditions. Matches with darkUniqueID or transparentUniqueID columns in Deployments_contextual_field_Information data table.
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
Attribute
- Name
-
duration
- Label
-
Duration
- Definition
-
Duration (in seconds) of GHG concentration timeseries used to obtain flux estimates.
Measurement Scale
Ratio
Unit
- standardUnit
-
second
Numeric domain
- Number type
-
real
Attribute
- Name
-
flux.term
- Label
-
Flux term
- Definition
-
Term used to convert flux untis from change in ppb per second to nmol per square meter per second. It takes into account the chamber geometry (base area and volume) as well as temperature, atmospheric pressure and water vapor concetration inside the chamber at the beginning of the incubation. See: https://qepanna.quarto.pub/goflux/goFlux.html.
Measurement Scale
Ratio
Unit
- Custom Unit
-
moles per meter squared
Numeric domain
- Number type
-
real
Attribute
- Name
-
MDF.lim
- Label
-
Minimal Detectable Flux
- Definition
-
Limit under which a flux estimate is considered below the detection limit (depends on instrument accuracy and duration of incubation and chamber geometry)
Measurement Scale
Ratio
Unit
- Custom Unit
-
nanomole per square meter per second
Numeric domain
- Number type
-
real
Attribute
- Name
-
C0.10s
- Label
-
CH4 average concentration
- Definition
-
Average concentration of CH4 gas during the first 10 seconds of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per billion
Numeric domain
- Number type
-
real
Attribute
- Name
-
C0.10s.sd
- Label
-
CH4 average concentration standard deviation
- Definition
-
Standard deviation of the average concentration of CH4 gas (ppb) during the first 10 seconds of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per billion
Numeric domain
- Number type
-
real
Attribute
- Name
-
Cf.10s
- Label
-
CH4 average concentration
- Definition
-
Average concentration of CH4 gas during the last 10 seconds of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per billion
Numeric domain
- Number type
-
real
Attribute
- Name
-
Cf.10s.sd
- Label
-
CH4 average concentration standard deviation
- Definition
-
Standard deviation of the average concentration of CH4 gas during the last 10 seconds of the incubation
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per billion
Numeric domain
- Number type
-
real
Attribute
- Name
-
total.flux
- Label
-
Total flux
- Definition
-
Two-point CH4 flux estimate, calculated via the difference between C0.10s and Cf.10s through the duration of the incubation and multiplied by the flux.term value.
Measurement Scale
Ratio
Unit
- Custom Unit
-
nanomole per square meter per second
Numeric domain
- Number type
-
real
Attribute
- Name
-
total.flux.se
- Label
-
Total flux standard error
- Definition
-
Standard error of total.flux.
Measurement Scale
Ratio
Unit
- Custom Unit
-
nanomole per square meter per second
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.flux
- Label
-
Linear Model flux
- Definition
-
Linear CH4 flux estimate. Obtained via Linear regression of CH4 concentration (ppb) through time (duration, s) and multiplied by flux.term value.
Measurement Scale
Ratio
Unit
- Custom Unit
-
nanomole per square meter per second
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.flux.se
- Label
-
Linear Model flux standard error
- Definition
-
Standard error of LM.flux.
Measurement Scale
Ratio
Unit
- Custom Unit
-
nanomole per square meter per second
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.MAE
- Label
-
Linear Model Mean Absolute Error
- Definition
-
Mean Absolute Error of LM model.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per billion
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.RMSE
- Label
-
Linear Model Root Mean Square Error
- Definition
-
Root Mean Square Error of LM model.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per billion
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.AICc
- Label
-
Linear Model Akaike Information Criterion
- Definition
-
Akaike Information Criterion corrected for small sample size of LM model.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.r2
- Label
-
Linear Model R2
- Definition
-
Coefficient of determination (R-squared) of LM model.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
LM.p.val
- Label
-
Linear Model p-value
- Definition
-
P-value of LM model, test if the slope if statistically different from cero.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.flux
- Label
-
Hutchinson and Mosier model flux
- Definition
-
Non-linear (HM) CH4 flux estimate. Obtained via the application of the Hutchinson and Mosier 1981 flux model, multiplied by flux.term value.
Measurement Scale
Ratio
Unit
- Custom Unit
-
nanomole per square meter per second
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.flux.se
- Label
-
Hutchinson and Mosier model flux stardard error
- Definition
-
Standard error of HM.flux.
Measurement Scale
Ratio
Unit
- Custom Unit
-
nanomole per square meter per second
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.MAE
- Label
-
Hutchinson and Mosier model Mean Absolute Error
- Definition
-
Mean Absolute Error of HM model.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per billion
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.RMSE
- Label
-
Hutchinson and Mosier model Root Mean Square Error
- Definition
-
Root Mean Square Error of HM model.
Measurement Scale
Ratio
Unit
- Custom Unit
-
parts per billion
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.AICc
- Label
-
Hutchinson and Mosier model Akaike Information Criterion
- Definition
-
Akaike Information Criterion corrected for small sample size of HM model.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.r2
- Label
-
Hutchinson and Mosier model R2
- Definition
-
Coefficient of determination (R-squared) of HM model.
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
HM.k
- Label
-
Hutchinson and Mosier model K
- Definition
-
Kappa of HM model. Determines the curvature of the model. A large kappa returns a strong curvature.
Measurement Scale
Ratio
Unit
- Custom Unit
-
inverse second
Numeric domain
- Number type
-
real
Attribute
- Name
-
k.max
- Label
-
K maximum
- Definition
-
Maximum limit for the kappa (HM.K) curvature parameter. Estimated from the LM.flux, the MDF.lim and the duration of the incubation.
Measurement Scale
Ratio
Unit
- Custom Unit
-
Inverse second
Numeric domain
- Number type
-
real
Attribute
- Name
-
g.fact
- Label
-
g factor
- Definition
-
Ratio between a the non-linear flux estimate (HM.flux) and the linear flux estimate (LM.flux).
Measurement Scale
Ratio
Unit
- standardUnit
-
dimensionless
Numeric domain
- Number type
-
real
Attribute
- Name
-
best.model
- Label
-
Best Model
- Definition
-
Name of the flux estimate (LM, HM, total.flux, None appropriate) that is considered to be best (based on objective criteria of model performance). “None appropriate” code indicates incubations with severe artefacts, precluding the selection of any flux estimate for them.
Measurement Scale
nominal
nonNumericDomain
enumeratedDomain
- codeDefinition
-
LM
Linear Model
-
- codeDefinition
-
HM
Hutchinson and Mosier model
-
- codeDefinition
-
total.flux
Two-point estimate
-
- codeDefinition
-
None appropriate
Artefacts preclude reliable flux estimation
-
Attribute
- Name
-
best.model.flags
- Label
-
Best Model Flags
- Definition
-
Main reason or reasons for the selection of best.model. Includes flags for the failure of various objective conditions that determine which model estimate (LM, HM total.flux) is considered to be the most appropriate.
Measurement Scale
nominal
nonNumericDomain
textDomain
- Definition
-
Any Text
- numberOfRecords
-
3042
