Data · collection
Annual measurements of atmospheric methane concentrations and isotopic ratios from Arrival Heights, Ross Island
Listed in NASA Earthdata CMR
The atmospheric trace gas, methane (CH4), affects the radiative heat balance of the earth.
Description
The sources of atmospheric methane are not well understood. Large air samples (1000-1400 litres) of methane are collected from a compressor system at Arrival Heights annually (since 1989) and samples are analysed for methane concentrations, the isotopic ratios of 14C/ 13C and 13C/12C and the characteristics and fluxes of sources and sinks are assessed.
Sample collection is aimed at the clean sector of the sky from the West through North to East, throughout the year. Measurements of methane carbon isotopes and its concentration in the atmosphere in Antarctica will help to determine the geographic variation, transport and the type and distribution of the sources of methane from the northern hemisphere. In-situ flask sampling: CO2, CH4, CO, N2O, 13CO2, 14CH4, 13CO, C180, 14CO. gas samples are collected from a mast 95 meters above ground level) in North sectors wind conditions only and above 5 knots.
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There are high pressure(~1000 litres, 800psi in 30L cylinder) and low pressure (~5 litres, 25psi in 2 litre flask) flask samples taken. Aire samples in the tanks and flasks are shipped back to NZ annually. Analysis is performed at NIWA's GAS LAB located at Greta Point Wellington.
Gas chromatography (GC) and isotope ratio mass spectrometry (IRMS) employed in analysis. Data is held internally by NIWA and in the WDCGG database.
Links
Get the data
- gaw.kishou.go.jp /wdcgg ↗
The data is publically available at the Global Atmospheric Watch, World Data Centre for Greenhouse Gases (WDCGG)
download · from NASA CMR
- niwa.co.nz /our-science/atmosphere/baring/info ↗
NIWA's atmospheric homepage with links to ftp sites with data
download · from NASA CMR
- WDCGG: World Data Centre for Greenhouse Gases ds.data.jma.go.jp/gmd/wdcgg ↗
download · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214598464-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214598464-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Carbon Dioxide · Carbon Monoxide · Carbon Monoxide · Gas Chromatograph/Mass Spectrometry · GAS CHROMATOGRAPHS · GROUND-BASED OBSERVATIONS · Methane · Nitrogen Dioxide · Trace Gases/Trace Species
- Inferred from text
- Atmospheric sciences 72% · Mass spectrometry 75%
Provenance · 1 source records, 17 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214598464-SCIOPS | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].anzsrc:group:3701 | enrichment · NASA CMR | taxonomy-embedding@1.1.0 | title+keywords+description (72%) |
| concepts[instrument].gcmd_instrument:gas-chromatographs | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:gc-ms | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/air-quality/carbon-monoxide | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/atmospheric-chemistry/carbon-and-hydrocarbon-compounds/carbon-dioxide | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/atmospheric-chemistry/carbon-and-hydrocarbon-compounds/carbon-monoxide | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/atmospheric-chemistry/carbon-and-hydrocarbon-compounds/methane | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/atmospheric-chemistry/nitrogen-compounds/nitrogen-dioxide | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/atmospheric-chemistry/trace-gases-trace-species | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[modality].local:modality:mass-spectrometry | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[platform].gcmd_platform:ground-based-observations | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |