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 | 76 |
|---|---|
| Acronym | UYRK |
| Name | University of York |
| Address 1 | |
| Address 2 | NCAS, University of York |
| Address 3 | York YO10 5DD United Kingdom |
| Country/Territory | United Kingdom of Great Britain and Northern Ireland |
| Website | http://www.york.ac.uk/ |
Contact(s)
| Name | Katie Read |
|---|---|
| Prefix | Dr. |
| katie.read@york.ac.uk | |
| Organization No | 76 |
| Organization acronym | UYRK |
| Organization name | University of York |
| Organization country/territory | United Kingdom of Great Britain and Northern Ireland |
| Address 1 | NCAS, Department of Chemistry |
| Address 2 | University of York, Heslington |
| Address 3 | York YO10 5DD United Kingdom |
| Country/territory | United Kingdom of Great Britain and Northern Ireland |
| Tel | +44-1904-322565 |
| Fax | +44-1904-322516 |
| Last updated date | 2024-04-04 |
| Name | Lucy Carpenter |
|---|---|
| Prefix | Prof. |
| lucy.carpenter@york.ac.uk | |
| Organization No | 76 |
| Organization acronym | UYRK |
| Organization name | University of York |
| Organization country/territory | United Kingdom of Great Britain and Northern Ireland |
| Address 1 | NCAS, Department of Chemistry |
| Address 2 | University of York, Heslington |
| Address 3 | York YO10 5DD United Kingdom |
| Country/territory | United Kingdom of Great Britain and Northern Ireland |
| Tel | |
| Fax | |
| Last updated date | 2024-04-04 |
| Background observation | |
| UTC | |
| ppb | |
|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A |
|
|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: Picarro G2401(CRDS) |
|
|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: 7.5 (m) |
|
| 4 seconds | |
| Calibration of CO2 and CH4 is performed with reference to a single gas standard containing a known amount of CO2/CH4. It is well understood that the instrument behaves linearly within the measurement range. Calibrations are performed once per week by sampling for 30 minutes and the data is applied retrospectively applying a linear drift adjustment. The CO2/CH4 measurements are fully traceable to the international Global Atmospheric Watch (GAW) scale. This means that the gas calibration standards used to calculate the final concentrations are referenced to a common standard held at the NOAA/ESRL laboratory. To ensure this is upheld, the designated world calibration centre for Carbon Monoxide: WCC-Empa (http://www.empa.ch/plugin/template/empa/*/7571), carries out regular audits of the measurements using travelling standards. For more information please see the report from the most recent of these audits: http://www.wmo.int/pages/prog/arep/gaw/documents/CVO_2012.pdf | |
|
Invalidated data (flag3) includes data when % water content >5%, CO2,CH4,H2O are equal to zero and data when CO2, CH4 <100. Data when CO > 250ppb indicates lab leak and so CH4, CO2 data also invalidated at these times. Flag2 is used as a reduced quality data flag and includes data which is affected by local conditions (wind speed <2 m/s, 350>wind direction >100 degrees) |
|
|
[Hourly] Hourly: Zero, calibration and invalidated data is removed prior to averaging. Hourly data is obtained by averaging all the data within a 1 hour period for example between 00:00 - 01:00. Standard deviation and number of points used to obtain the average are provided. [Daily] Daily: Zero, calibration and invalidated data is removed prior to averaging. Daily data is obtained by averaging all the data within a 24 hour period for example between 01/01/14 00:00 - 02/01/2014 01:00. Standard deviation and number of points used to obtain the average are provided. [Monthly] Monthly: Zero, calibration and invalidated data is removed prior to averaging. Daily data is obtained by averaging all the data within a 24 hour period for example between 01/01/14 00:00 - 01/02/2014 01:00. Standard deviation and number of points used to obtain the average are provided. |
|
|
Error Flag = 0 Good data Error Flag = 1 Reduced quality data, also includes local interference data (ws<2/ms, 350>wd >100deg) Error Flag = 2 Below detection limit Error Flag = 3 Invalid or missing data |
|
|
Valid (background): 0 Valid: 1 Valid: 2 Invalid: 3 |
|
| Operational/Reporting | |
|
Picarro CH4 Measuring range: 0 - 20 ppm Precision (5 sec / 5 min / 60 min, 1σ) <1 ppb /0.5 ppb / 0.3 ppb Max Drift at STP (over 24 hrs / 1 month) 1 ppb /3 ppb Max Uncertainty using Reference Gas (1 hr average, 2σ) < 1 ppb CO2 Measuring range: 0 - 1000 ppm Precision (5 sec / 5 min / 60 min, 1σ) <50 ppb /20 ppb / 10 ppb Max Drift at STP (over 24 hrs / 1 month) 100 ppb /500 ppb Max Uncertainty using Reference Gas (1 hr average, 2σ) < 50 ppb CO2 and CH4 are sampled through 10m of 40mm diameter heated glass inlet. The air then passes through 2m of 1/8" stainless steel tubing and a teflon filter. Initially (2015-Oct 2019) the air was not dried and a the instrument water correction was applied. Since October 2019 the sample has been dried using a nafion drier (PERMAPURE) as we have found that since a return to the manufacturer the water correction is now not acceptable. |
|
|
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 |
|
|
Meteorological data may remain as first provided, even when greenhouse gas data are updated. |
No DOI available
Related information
| 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 |
||||
| Geolocation Point |
|
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.
Katie Read (UYRK),
Lucy Carpenter (UYRK),
Atmospheric CH4
at Cape Verde Atmospheric Observatory by University of York
,
dataset published as CH4_CVO_
surface-insitu_UYRK_data1 at WDCGG,
ver. 2024-04-04-0952 (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.
