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 | 27 |
|---|---|
| Acronym | HKO |
| Name | Hong Kong Observatory |
| Address 1 | |
| Address 2 | Hong Kong Observatory |
| Address 3 | 134A Nathan Road, Kowloon, Hong Kong. |
| Country/Territory | Hong Kong, China |
| Website | http://www.hko.gov.hk |
Contact(s)
| Name | W.H. Leung |
|---|---|
| Prefix | Mr. |
| whleung@hko.gov.hk | |
| Organization No | 27 |
| Organization acronym | HKO |
| Organization name | Hong Kong Observatory |
| Organization country/territory | Hong Kong, China |
| Address 1 | |
| Address 2 | |
| Address 3 | |
| Country/territory | Hong Kong, China |
| Tel | +852 2926 8421 |
| Fax | +852 2375 2645 |
| Last updated date | 2024-09-10 |
| Name | M.C.Lam |
|---|---|
| Prefix | Mr. |
| mclam@hko.gov.hk | |
| Organization No | 27 |
| Organization acronym | HKO |
| Organization name | Hong Kong Observatory |
| Organization country/territory | Hong Kong, China |
| Address 1 | |
| Address 2 | |
| Address 3 | |
| Country/territory | Hong Kong, China |
| Tel | +852 2926 8024 |
| Fax | +852 2375 2645 |
| Last updated date | 2024-09-10 |
| Background observation | |
| UTC+08:00 | |
| ppm | |
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2010-11-01 00:00:00 - 2021-02-26 23:59:59: WMO CO2 X2007 2021-02-27 00:00:00 - 9999-12-31 23:59:59: WMO CO2 X2019 |
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2010-11-01 00:00:00 - 2019-12-31 23:59:59: LI-820 from LI-COR Biosciences Ltd.(NDIR) 2020-01-01 00:00:00 - 2021-02-26 23:59:59: LI-840A from LI-COR Biosciences Ltd.(NDIR) 2021-02-27 00:00:00 - 9999-12-31 23:59:59: LI-850 from LI-COR Biosciences Ltd.(NDIR) |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: 4 (m) |
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| 1 second | |
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The LI-820/LI-840A/LI-850 CO2 analyzer is calibrated once every two weeks (based on past experience of the stability of the analyzer; the zero drift as well as the overall system drift is less than 2 ppm in two weeks' time). During the calibration, secondary standard gases of concentration ~400 ppm and ~600 ppm are used for performance check and span calibration of the LI-820/LI-840A/LI-850 respectively. Before the calibration of LI-820/LI-840A/LI-850, the secondary gases are checked for any drift using a LI-7000 CO2 analyzer which is calibrated using the NOAA standard gases. Before the calibration, the LI-820/LI-840A/LI-850 is checked for its performance using the ~400 ppm secondary standard gas and a zero gas. 1. The ~400 ppm standard gas is applied to check for any instrument drift; 2. The zero gas is applied to check for any zero drift; 3. The measured data from steps (1) and (2) are kept for future ref.; 4. Due to the limitation of LI-820/LI-840A/LI-850, only the zero and span calibration are carried out; 5. The LI-820/LI-840A/LI-850 is set zero using the zero gas and then the span point is set using the ~600 ppm secondary standard gas; 6. Finally, the performance of LI-820/LI-840A/LI-850 at around 400 ppm is checked using the ~400 ppm secondary standard gas and the data is kept for future reference. |
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1. 1-minute average CO2 concentration is calculated from 60 1-second data once every minute; 2. The time series of the raw 1-minute average CO2 concentration is first examined manually to identify any suspicious/erroneous data. Erroneous data are not used for compilation of the hourly and daily mean. 3. Hourly mean CO2 concentration is derived from the 1-minute average; 4. Daily mean CO2 concentration is derived from the hourly mean. |
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[Hourly] Please refer to the "data processing" section [Daily] Please refer to the "data processing" section [Monthly] Monthly mean are derived from the daily mean |
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| At present, only daily mean CO2 concentration data are submitted and data quality assurance have been carried out at HKO. Hence all data QC flags are 1, meaning data checked OK. | |
|
Valid: 1 Valid: 2 Invalid: 3 |
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| Operational/Reporting | |
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Since November 2010 up to 31 December 2019, instrument used for measuring carbon dioxide concentration was LI-820 from LI-COR Biosciences Ltd. Carbon dioxide concentration in ambient moist air was measured and reported. During the period of 1 January 2020 to 26 February 2021, a newer model LI-840A, was employed to measure carbon dioxide concentration. And since 27 February 2021 onward, LI-850 has been used for the measurement.Both LI-840A and LI-850 sensors measure carbon dioxide as well as water concentration in air, thereby making moisture correction possible through simple post-processing of the data. Carbon dioxide concentration in dry air has been reported from 1 January 2020 onwards. |
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Wind direction: Wind speed: Relative humidity: Precipitation amount: Air pressure: Air temperature: Dew point temperature: Sea water temperature: Sea surface water temperature: Sea water salinity: Sea surface water salinity: |
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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 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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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.
W.H. Leung (HKO),
M.C.Lam (HKO),
Atmospheric CO2
at Hok Tsui / Cape d Aguilar by Hong Kong Observatory
,
dataset published as CO2_HKG_
surface-insitu_HKO_data1 at WDCGG,
ver. 2024-09-10-0255 (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.
