Soil-atmosphere flux measurements calculated from concentration of methane and nitrous oxide taken from the Pastaza-Marañón foreland basin, Peru

The research team collected data on soil-atmosphere exchange of trace gases and environmental variables during four field campaigns (two wet seasons, two dry seasons) the lowland tropical peatland forests of the Pastaza-Marañón foreland basin in Peru. The campaigns took place over a 27 month period, extending from February 2012 to May 2014.

This dataset contains measurements from field sampling of soil-atmosphere fluxes concentrated on 4 dominant vegetation types in the lowland tropical peatland forests of the Pastaza-Marañón foreland basin. Vegetation types included; forested vegetation, forested [short pole] vegetation, Mauritia flexuosa-dominated palm swamp, and mixed palm swamp. They were measured at 5 different sites in Peru including; Buena Vista, Miraflores, San Jorge, Quistococha, and Charo.

Greenhouse gas (GHG) fluxes were captured from both floodplain systems and nutrient-poor bogs in order to account for underlying differences in biogeochemistry that may arise from variations in hydrology.

Parameters include methane and nitrous oxide fluxes, air/soil temperatures, soil pH, soil electrical conductivity, soil dissolved oxygen content, and water table depth.

See documentation and data lineage for data quality.

These data were collected in support of the NERC project: Amazonian peatlands - A potentially important but poorly characterised source of atmospheric methane and nitrous oxide (NE/I015469/2)

Date (Publication): 2017-07-24T16:13:44

Date (Creation): 2017-07-24T16:13:44

Citation identifier: https://catalogue.ceda.ac.uk/uuid/a3614fb00ff74999a5187d3a3767d96d

Citation identifier: Centre for Environmental Data Analysis (CEDA) / a3614fb00ff74999a5187d3a3767d96d

Citation identifier: doi / http://dx.doi.org/10.5285/a3614fb00ff74999a5187d3a3767d96d

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Unavailable	Teh, Yit Arn	Unavailable	Author
Unavailable	Murphy, Wayne A	Unavailable	Author
Unavailable	Berrio, Juan-Carlos	Unavailable	Author
Unavailable	Boom, Arnoud	Unavailable	Author
Unavailable	Page, Susan	Unavailable	Author
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Custodian
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Distributor
Unavailable	Teh, Yit Arn	Unavailable	Principal investigator
Unavailable	Teh, Yit Arn	Unavailable	pointofContact
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Publisher

Maintenance and update frequency: Not planned

Update scope: Dataset

Keywords

methane
nitrous oxide
peat
tropical peatland
Pastaza-Marañón foreland basin
Amazonia
Peru

GEMET - INSPIRE themes, version 1.0

atmospheric conditions

Access constraints: Other restrictions

Other constraints: Public data: access to these data is available to both registered and non-registered users.

Use constraints: Other restrictions

Other constraints: Under the following licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/, appropriate use of these data may fall under any use. This message is intended as guidance, always read the full licence. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.

Spatial representation type: Grid

Language: English

Topic category

Climatology, meteorology, atmosphere

Begin date: 2012-02-01T00:00:00

End date: 2014-05-29T23:00:00

Unique resource identifier: WGS 84

Distribution format

Name	Version
CSV

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
	https://catalogue.ceda.ac.uk/uuid/a3614fb00ff74999a5187d3a3767d96d	CEDA Data Catalogue Page

OnLine resource

Protocol	Linkage	Name
	http://data.ceda.ac.uk/badc/deposited2017/peru-peatlands/data/abn-fluxes	DOWNLOAD

OnLine resource

Protocol	Linkage	Name
	http://dx.doi.org/10.5194/bg-2017-48	Seasonal variability in methane and nitrous oxide fluxes from tropical peatlands in the Western Amazon basin (Biogeosciences Discussion paper)

Hierarchy level: Dataset

Conformance result

Title: Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

Date (Publication): 2010-12-08

Statement: Gas samples were collected using a static chamber approach, samples stored in vials (Exetainers), and later analysed using a gas chromatograph with flame ionisation detector for methane detection and an electron capture detector for nitrous oxide quantification. Environmental variables were collected concomitantly, including air temperature, soil temperature, soil pH, soil electrical conductivity, soil dissolved oxygen content, and water table depth. Temperature was determined using a thermocouple; pH, electrical conductivity, and dissolved oxygen using a HACH® rugged outdoor HQ30D multi meter and pH, LDO or EC probe. Water table depth was measured using a depth measure.

Diffusive gas fluxes were determined by using the JMP IN version 11 (SAS Institute, Inc., Cary, North Carolina, USA) statistical package to plot best-fit lines to the data for headspace concentration against time for individual flux chambers, with fluxes calculated from linear or non-linear regressions depending on the individual concentration trend against time. Gas mixing ratios (ppm) were converted to areal fluxes by using the Ideal Gas Law to solve for the quantity of gas in the headspace (on a mole or mass basis) and normalized by the surface area of each static flux chamber. Ebullition-derived methane fluxes were also quantified in our chambers where evidence of ebullition was found. This evidence consisted of either: (i) rapid, non-linear increases in methane concentration over time; (ii) abrupt, stochastic increases in methane concentration over time; or (iii) an abrupt stochastic increase in methane concentration, followed by a linear decline in concentration. For observations following pattern (i), flux was calculated by fitting a quadratic regression equation to the data (P < 0.05), and methane flux determined from the initial steep rise in CH4 concentration. For data following pattern (ii), the ebullition rate was determined by calculating the total methane production over the course of the bubble event, in-line with prior work conducted by the investigators. Last, for data following pattern (iii), a best-fit line was plotted to the methane concentration data after the bubble event, and a net rate of methane uptake calculated from the gradient of the line. Observations following patterns (i) and (ii) were categorized as “ebullition” (i.e. net efflux) whereas observations following pattern (iii) were categorized as “ebullition-driven methane uptake” (i.e. net influx).

Flux data were removed (i.e. filtered) from the dataset if: (i) the change in gas concentration over time was not found to be statistically significant (alpha level of 0.05); (ii) evidence were found that an individual static flux chamber was not gas-tight (evidenced by a negative carbon dioxide flux); (iii) evidence were found that two or more Exetainers had been compromised by incomplete evacuation or leakage; or (iv) other evidence that an individual flux chamber had been compromised (e.g. evidence from field observations that the static flux chamber had been disturbed during the measurement process).