Sea-air methane fluxes measured using an eddy-covariance technique on RRS James Clark Ross from January 2019 to March 2021

This dataset contains sea-air methane flux data from January 2019 to March 2021 measured using a Picarro G2311-f greenhouse gas analyser onboard RRS James Clark Ross, in the Southern Ocean, Arctic Ocean and Atlantic Ocean. The fluxes are 2 hour averaged and have been filtered based on wind direction to data corresponding to wind coming from behind the ship to remove sources of pollution from the ship stack. Limit of detection for the flux data are calculated for each cruise by multiplying the standard deviation of the random noise by three.

This work was supported by the Natural Environment Research Council and the ARIES Doctoral Training Partnership (grant no. NE/S007334/1). Royal Holloway, University of London was funded by NERC through grants NE/V000780/1 and NE/N016211/1. Anna E. Jones and Katrin Linse were part of the British Antarctic Survey Polar Science for Planet Earth Programme funded by the Natural Environment Research Council (NERC) [NC-Science]. The measurements from the Royal Research Ship James Clark Ross (JCR) were principally supported by the UK Natural Environment Research Council''s ORCHESTRA project (Grant No. NE/N018095/1). The Picarro analyser was funded by the European Space Agency funding (ESA AMT4OceanSatFlux project, Grant No. 4000125730/18/NL/FF/gp). This work further contributes to the NERC MOYA project (Grant No. NE/N015932/1).

Alternate title: Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01814

Date (Publication): 2024-01-12

Citation identifier: http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/01814

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey		pdc@bas.ac.uk	Custodian
NERC EDS UK Polar Data Centre	Workman, E., Yang, M., Bell, T., Dong, Y., Jones, A., Fisher, R., France, J., & Linse, K.	pdc@bas.ac.uk	Originator

Maintenance and update frequency: Unknown

Keywords

NDGO0001

NERC OAI Harvesting

NERC_DDC

GCMD Parameter Valids

EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Carbon and Hydrocarbon Compounds > Methane
EARTH SCIENCE > Oceans > Ocean Chemistry

BAS Free-text keywords

Picarro
methane
polar oceans
sea-air flux

Use limitation: This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

Access constraints: Other restrictions

Other constraints: This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

Language: English

Topic category

Oceans

Begin date: 2019-06-30

End date: 2019-08-01

Reference system identifier: OGP / urn:ogc:def:crs:EPSG::4326

Distribution format

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
Polar Data Centre - British Antarctic Survey		pdc@bas.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
http	http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=c9ed4746-f104-4117-ba60-174c5275e2fe	GET DATA

Hierarchy level: Dataset

Domain consistency

Measure identification: INSPIRE / Conformity_001

Conformance result

Title: INSPIRE Data Specification on unknown theme Guidelines

Date

Explanation: See the referenced specification

Pass: No

Statement: QA/QC filters used are:

Basic CH4 flux filtering: same filtering for wind direction and ship movement as for CO2 flux (Dong et al, 2021), then filter data based on these stats within 20min window:

CH4(range) < 0.02ppm

CH4(sdev) < 0.0014ppm

abs(CH4(slope)) < 0.02ppm/hr

Finally remove flux outside of 5 sdev and average to 2hr intervals (retaining 2hr periods with at least 4 good flux segments).

Missing flux data is due to quality control filtering/instrument not collecting data.