In line with the GAW Data Policy, users should contact the contributors of all data of interest and propose co-authorship or acknowledgement.
Organization
| NO | 66 |
|---|---|
| Acronym | SAWS |
| Name | South African Weather Service |
| Address 1 | South African Weather Service - GAW, |
| Address 2 | Freight Road, Oval Park Office, |
| Address 3 | Cape Town Int Airport, 7525 |
| Country/Territory | South Africa |
| Website | http://www.weathersa.co.za/ |
Contact(s)
| Name | Thumeka Mkololo |
|---|---|
| Prefix | Dr |
| thumeka.mkololo@weathersa.co.za | |
| Organization No | 66 |
| Organization acronym | SAWS |
| Organization name | South African Weather Service |
| Organization country/territory | South Africa |
| Address 1 | South African Weather Service - GAW, |
| Address 2 | Freight Road, Oval Park Office, |
| Address 3 | Cape Town Int Airport, 7525 |
| Country/territory | South Africa |
| Tel | |
| Fax | |
| Last updated date | 2023-11-28 |
| Name | Casper Labuschagne |
|---|---|
| Prefix | Mr |
| Casper.labuschagne@weathersa.co.za | |
| Organization No | 66 |
| Organization acronym | SAWS |
| Organization name | South African Weather Service |
| Organization country/territory | South Africa |
| Address 1 | South African Weather Service - GAW, |
| Address 2 | Freight Road, Oval Park Office, |
| Address 3 | Cape Town Int Airport, 7525 |
| Country/territory | South Africa |
| Tel | |
| Fax | |
| Last updated date | 2024-04-19 |
| Background observation | |
| UTC+02:00 | |
| ppb | |
|
9999-12-31 00:00:00 - 2014-12-31 23:59:59: WMO CH4 X2004 2015-01-01 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A |
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1983-01-01 00:00:00 - 2004-10-31 23:59:59: Carlo Erba(Gas chromatography (FID)) 2004-11-01 00:00:00 - 2015-12-31 23:59:59: VARIAN 5890(Gas chromatography (FID)) 2016-01-01 00:00:00 - 9999-12-31 23:59:59: Picarro G2301(CRDS) |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: 30 (m) |
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| 1 minute | |
|
Historically - One working standard is used every hour and calibrated against two NOAA CMDL primary standards approximately once every 4 months. A target gas is also run once daily as a check on instrumental stability. Since 2015 - daily target gas run to track instrument stability & drift; bi-annual calibration of CRDS via 5x NOAA laboratory standards NOAA04 scale (a gravimetrically-prepared CH4 standard scale (see Dlugokencky et al., 2005)). This scale results in CH4 mole fractions that are a factor of 1.0124 greater than previous NOAA methane measurement scale. 2015 onwards: Refer to WMO/ NOAA documentation regarding latest scale information. Currently WMO-CH4-X2004A daily target gas and monthly 4x secondary laboratory standards to verify calibration line function;Quarterly 5x NOAA laboratory standards to determine calibration line function; Annually, a review of the 4 quarterly calibrations via a rolling average. |
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| All data with obvious sampling or analytical error are rejected. Furthermore, a statistical filter (moving percentiles) is applied for the selection of background concentrations. Final data are reported with the calibrations omitted. | |
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[Hourly] Each half-hourly mean constitutes the preceeding two 15 data points. (i.e. the mean at 2:00 would comprise the 1:45 & 2:00 data points); 2015 - onwards: similar procedure to determine 30-min averages from high frequency 1-min data; [Daily] [Monthly] |
|
| All data reported are valid. Invalid data & Calibrations have been removed from final reported data sets. | |
|
Valid: 2 |
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| Operational/Reporting | |
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Scientific Aim : Observation of long-term CH4 trends in maritime air representative of the southern hemispheric mid-latitudes. Research related to baseline CH4 levels and deducing CH4 sources and sinks. Sampling Environment : Measurements are representative of the greater southern ocean fetch region (baseline filtered data set) and reflects global processes; on occassion, continental air is also sampled, including Cape town metropole (All data set); data should be used in conjunction with Radon-222 tracer data; 15-minute measurements averaged to 30-minute final reporting intervals (1982 - 2015); 1-minute measurements averaged to 30-min final reported intervals (2016 - present); |
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Wind direction: 1 Wind speed: 1 Relative humidity: 1 Precipitation amount: 0 Air pressure: 1 Air temperature: 1 Dew point temperature: 0 Sea water temperature: 0 Sea surface water temperature: 0 Sea water salinity: 0 Sea surface water salinity: 0 |
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Meteorological data may remain as first provided, even when greenhouse gas data are updated. |
DOI Metadata
| DOI |
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| Version |
2023-11-28-1022 (Data Version History) * DOIs and file names may have multiple versions. Be sure to check the data version. |
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| Title | Atmospheric CH4 at Cape Point by South African Weather Service, dataset published as CH4_CPT_surface-insitu_SAWS_data1 at WDCGG | ||||||||||||||||||||||||||||||||
| Creator |
South African Weather Service Thumeka Mkololo (SAWS) Casper Labuschagne (SAWS) |
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| Publisher | World Data Centre for Greenhouse Gases | ||||||||||||||||||||||||||||||||
| Publication Date | 2018-08-21 (Last Updated: 2023-11-30) | ||||||||||||||||||||||||||||||||
| Format | Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF | ||||||||||||||||||||||||||||||||
| Relation List (Is Part Of) |
All CH4 data contributed to WDCGG by GAW stations and mobiles by 2023-09-13 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2022-09-07 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2021-08-27 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19 All CH4 data contributed to WDCGG by GAW stations and mobiles by 2018-10-25 |
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| Geolocation Point |
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GAW Data Policy
"For Scientific purposes, access to these data is unlimited and provided without charge.
By their use you accept that an offer of co-authorship will be made through personal contact with the data providers
or owners whenever substantial use is made of their data.
In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."
Citation format
This format is an example of the WDCGG standard citation.
Please follow the citation format which the data providers or owners indicate.
Please follow the citation format which the data providers or owners indicate.
Thumeka Mkololo (SAWS),
Casper Labuschagne (SAWS),
Atmospheric CH4
at Cape Point by South African Weather Service
,
dataset published as CH4_CPT_
surface-insitu_SAWS_data1 at WDCGG,
ver. 2023-11-28-1022, https://doi.org/10.50849/WDCGG_0066-1009-1002-01-01-9999 (Reference date*: YYYY/MM/DD)
* As the reference date, please indicate the date you downloaded the files.
* As the reference date, please indicate the date you downloaded the files.
