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 | 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 | 2024-08-13 |
| Background observation | |
| UTC+02:00 | |
| ppm | |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO CO2 X2019 |
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9999-12-31 00:00:00 - 2011-12-31 23:59:59: Hartmann & Braun URAS-4 NDIR(NDIR) 2012-01-01 00:00:00 - 2020-05-31 23:59:59: Picarro CRDS 2302(CRDS) 2020-06-01 00:00:00 - 9999-12-31 00:00:00: Picarro CRDS 2401(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 | |
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Historically: Two working standards are used four times a day. A reference (target)gas are determined once a day. These working and reference standards are compared with two primary standards from NOAA CMDL twice per month. Since 2002 two more NOAA CMDL primary standards were added to the calibration scale. (2012 - present): 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 [X2019] = 1.00079 * [X2007] - 0.142 ppm Reference: Hall et al., Revision of the WMO/GAW CO2 Calibration Scale, 2020, https://doi.org/10.5194/amt-2020-408, |
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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. Data selection applied to the "all data set" (based on statistical filtering)are done as follows: Two 11-day moving percentiles are applied to the data. The two freely selectable percentiles, each tuneable by a factor, serve as upper and lower cut-off limits for background concentration selection. Calibrations are removed from final reported data set. |
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[Hourly] The 1-min recorded intervals are used to create half-hourly means. The preceeding 30 values constitutes a half-hourly mean value (i.e the mean value reported for 2:30 will constitute 1min values from 2:01 - 2:30). [Daily] [Monthly] |
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| All data reported are valid. Invalid data & Calibrations have been removed from final reported data sets. | |
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Valid: 2 |
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| Operational/Reporting | |
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Scientific Aim : Observation of long-term CO2 trends in maritime air representative of the southern hemispheric mid-latitudes. Research related to baseline CO2 levels and deducing CO2 sources and sinks. Sampling Environment : Data is representatine of oceanic sources /sinks from the SW Atlantic as well as continental Africa on occassion. (1992 - 2011): Continuous sampling using a URAS 4 (NDIR) analyser. The height of the air intake is 260 m above sea level from the top of a 30 m high mast. Two freezing units (-4 and -45 °C respectively) are used in series to dry the ambient air prior to analysis. Since the beginning of 2000, an additional magnesium perchlorate filter was placed within the sampling line to create an effective dew point of -70 °C. The data have been recorded at 2 min intervals from 1993 till mid-99 and mixing ratios stored as hourly means. From mid-99 onwards 1-min intervals are used to create half-hourly means. These in turn form the basis for daily and monthly means. (2011 - present): High frequency 1-min data averaged to 30-min reported values; |
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Wind direction: 1 Wind speed: 1 Relative humidity: 1 Precipitation amount: 1 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. WS & WD is value reported on the hour (i.e. not 10min average); anemometer height same as GHG intake height. |
DOI Metadata
| DOI |
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| Version |
2024-06-18-1227 (Data Version History) * DOIs and file names may have multiple versions. Be sure to check the data version. |
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| Title | Atmospheric CO2 at Cape Point by South African Weather Service, dataset published as CO2_CPT_surface-insitu_SAWS_data1 at WDCGG | ||||||||||||||||||||||||||||||||
| Creator |
South African Weather Service Casper Labuschagne (SAWS) |
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| Publisher | World Data Centre for Greenhouse Gases | ||||||||||||||||||||||||||||||||
| Publication Date | 2018-08-21 (Last Updated: 2024-06-21) | ||||||||||||||||||||||||||||||||
| Format | Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF | ||||||||||||||||||||||||||||||||
| Relation List (Is Part Of) |
All CO2 data contributed to WDCGG by GAW stations and mobiles by 2024-09-24 All CO2 data contributed to WDCGG by GAW stations and mobiles by 2023-09-13 All CO2 data contributed to WDCGG by GAW stations and mobiles by 2022-09-07 All CO2 data contributed to WDCGG by GAW stations and mobiles by 2021-09-08 All CO2 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28 All CO2 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19 All CO2 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.
Casper Labuschagne (SAWS),
Atmospheric CO2
at Cape Point by South African Weather Service
,
dataset published as CO2_CPT_
surface-insitu_SAWS_data1 at WDCGG,
ver. 2024-06-18-1227, https://doi.org/10.50849/WDCGG_0066-1009-1001-01-01-9999 (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.
