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- ATSR-2, which flew on the second European Research Satellite (ERS-2) from June 1995 until January 2008. ERS-2 lost global coverage in June 2003, due to failure of the onboard data storage; Cloud_cci data do not extent beyond this date (thus providing approximately one-year of overlap with the succeeding AATSR product). Due to an instrument failure there is no data for 01/1996-06/1996.
- Advanced-ATSR (AATSR), which flew on ENVISAT from May 2002 until the satellite's failure in April 2012.
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Quantity | Cloud_cci variable | Targets |
Cloud amount | CFC |
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Cloud top pressure | CTP |
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Cloud top temperature | CTT |
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Cloud Optical Depth | COT |
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Cloud Water Path | LWP, IWP |
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Effective particle radius | CER |
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1.3 Data usage information
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C3S-312bL1-L3C-MONTHLY-CLOUD-INSTORACPLATFORM{}YYYYMM{_}_fvVVV.nc,
where INST and PLATFORM refer to the instrument and platform from which data originates (either ATSR2 and ERS2, or AATSR and ENVISAT for the CDR, or SLSTR and Sentinel-3a or -3b for the ICDR), YYYYMM provides the year and month covered by the monthly mean product, and VVV denotes the product version (3.0 for the TCDR, 3.1 for the ICDR).
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Property | Unit | Variable name | Comment |
Cloud fractional cover | - | cfc | |
Cloud-top pressure | hPa | ctp | |
Cloud-top height | km | cth | |
Cloud-top temperature | K | ctt | |
Cloud optical thickness | - | cot | Only retrieved on day-light side of orbit |
Cloud effective radius | µm | cer | Only retrieved on day-light side of orbit |
Cloud liquid water path | gm-2 | lwp | Only retrieved on day-light side of orbit |
Cloud ice water path | gm-2 | iwp | Only retrieved on day-light side of orbit |
For lists and details of known issues and limitations of the data, the user is referred to the referenced ATBDs and papers in Section 1.1. In particular, it should be noted that the monthly mean is computed using data from sun-synchronous polar-orbiting satellites, with a relatively narrow swath. Thus, it cannot be considered a representation of the mean properties of clouds across the whole month for two reasons:
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- ATSR-2, which flew on the second European Research Satellite (ERS-2) from June 1995 until January 2008. ERS-2 lost global coverage in June 2003, due to failure of the onboard data storage; Cloud_cci data do not extent beyond this date (thus providing approximately one-year of overlap with the succeeding AATSR product). Due to an instrument failure there is no data for 01/1996-06/1996. Gaps in the daily means can occur and are also due to instruments that are not working normally.
- Advanced-ATSR (AATSR), which flew on ENVISAT from May 2002 until the satellite's failure in April 2012. Gaps in the daily means can occur and are also due to instruments that are not working normally.
When referred to in terms of a continuous data record, these two instruments are commonly described as (A)ATSR. The preceding ATSR-1 instrument lacked the visible-NIR channels provided by (A)ATSR and thus isn’t included in the Cloud_cci product.
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Table 2-1: GCOS targets for cloud ECVs. Note that the Cloud_cci doesn't meet the temporal requirements due to the nature of the satellite observations, but exceeds the spatial resolution and aims to achieve the uncertainty and stability requirements.Anchor table2_1 table2_1
Quantity | Cloud_cci variable | Targets |
Cloud amount | CFC |
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Cloud top pressure | CTP |
|
Cloud top temperature | CTT |
|
Cloud Optical Depth | COT |
|
Cloud Water Path | LWP, IWP |
|
Effective particle radius | CER |
|
2.3 Data usage information
Cloud_cci products are provided in NetCDF (version 4), which are compliant with the conventions CF 1.8 and the NASA Global Change Master Directory (GCMD) Science Keywords vocabulary. Filenames follow the structure:
C3S-312bL1-L3C-DAILY-CLOUD-INSTORACPLATFORM{}YYYYMMDD{_}fvVVV{_}.nc,
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Table 2-2: Cloud properties included in Cloud_cci TCDR and SLSTR ICDR daily products.Anchor table2_2 table2_2
Property | Unit | Variable name | Comment |
Cloud fractional cover-day | - | cfc_day | |
Cloud fractional cover-night | - | cfc_night | |
Cloud-top pressure-day | hPa | ctp_day | |
Cloud-top pressure-night | hPa | ctp_night | |
Cloud-top height-day | km | cth_day | |
Cloud-top height-night | km | cth_night | |
Cloud-top temperature-day | K | ctt_day | |
Cloud-top temperature-night | K | ctt_night | |
Cloud optical thickness-day | - | cot_day | |
Cloud effective radius-day | µm | cer_day | |
Cloud liquid water path-day | gm-2 | lwp_day | |
Cloud liquid water path-night | gm-2 | lwp_night | |
Cloud ice water path-day | gm-2 | iwp_day | |
Cloud ice water path-night | gm-2 | iwp_night |
For lists and details of known issues and limitations of the data, the user is referred to the referenced ATBDs and papers in Section 1.1.
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Sus, O., M. Stengel, S. Stapelberg, G. McGarragh, C.A. Poulsen, A.C. Povey, C. Schlundt, G.E. Thomas, M. Christensen, S. Proud, M. Jerg, R.G. Grainger, R. Hollmann, 2018: The Community Cloud retrieval for Climate (CC4Cl) – Part 1: A framework applied to multiple satellite imaging sensors. Atmos. Meas. Tech., 11, 3373-3396, DOI: 10.5194/amt-11-3373-2018.
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement signed on 11/11/2014). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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