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Table 1‑1: The orbital characteristics of the Sentinel-3 satellites. Note that these characteristics are very similar to the ERS-2 and ENVISAT platforms which carried the preceding ATSR instruments.Anchor table1_1 table1_1
Altitude | Inclination | Period | Repeat Cycle | Ground-track deviation | Local Time at Descending node |
814.5 km | 98.65° | 100.99 min | 27 days | ±1 km | 10:00 |
The SLSTR instrument is described in detail by the Sentinel-3 SLSTR User Guide [D10], but an overview of its specifications is given in Table 1‑2.
Table 1‑2: The specifications of the SLSTR instruments (taken from the SLSTR User Guide [D10]).Anchor table1_2 table1_2
Capability | SLSTR Specifications | |
Swath | Nadir view | 1,400 km |
Oblique view | 740 km | |
Global Coverage Revisit Times | 1 satellite | 1 day (mean) |
2 satellites | 0.5 day (mean) | |
Spatial Sampling interval at Sub-satellite point (km) | VIS-SWIR | 0.5 km |
IR-Fire | 1 km | |
Spectral channel centre (µm) | VIS | 0.554 (S1); 0.659 (S2) 0.868 (S3) |
SWIR | 1.374 (S4); 1.613 (S5); 2.25 (S6) | |
MWIR/TIR | 3.742 (S7); 10.85 (S8); 12.02 (S9) | |
Fire ½ | 3.742 (F1); 10.85 (F2) | |
Radiometric Resolution | VIS (Albedo =0.5%) | Signal-to-Noise Ratio (SNR) > 20 |
SWIR (Albedo =0.5%) | Signal-to-Noise Ratio (SNR) > 20 | |
MWIR (T =270K) | NEΔT < 80 mK | |
TIR (T=270K) | NEΔT < 50 mK | |
Fire 1 (<500 K) | NEΔT < 1 K | |
Fire 2 (<400 K) | NEΔT < 0.5 K | |
Radiometric Accuracy | VIS-SWIR (Albedo = 2-100%) | < 2% (Beginning of Life) |
<5% (End of Life) | ||
MWIR –TIR(265 – 310 K) | < 0.2 K (0.1 K goal) | |
Fire (< 500 K) | < 3 K |
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(A)ATSR Channel number | SLSTR Band name | Nominal wavelength |
2 | S2 | 0.67 m |
3 | S3 | 0.87 m |
4 | S5 | 1.6 m |
6 | S8 | 10.8 m |
7 | S9 | 12.0 m |
In addition to (A)ATSR or SLSTR level 1 data, the CC4CL retrieval scheme also relies on a range of auxiliary datasets, which are detailed in Table 2-2.
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Dataset | Description |
ECMWF ERA-Interim | ECMWF reanalysis products provide pressure, temperature, humidity and ozone profiles, as well a priori surface temperature, sea ice extent and near-surface wind speed for ocean surface reflectance calculation. |
MODIS MCD43A1 The product used is MCD43A1 V006. See the MODIS user guide at https://www.umb.edu/spectralmass/terra_aqua_modis/v006 (accessed 7-May-2020). V006 | The MODIS BRDF product provides land-surface reflectance. |
IREMIS UW Baseline Fit | The Global Infrared Land Surface Emissivity (IREMIS) University of Wisconsin-Madison Baseline Fit to the MODIS MOD11 emissivity product provides land-surface emissivity. |
RTTOV | The standard coefficient and database files provided with RTTOV v 12.1 are used, where not superseded by other auxiliary data (as is the case with the emissivity and surface reflectance atlases) |
Further details of the input and auxiliary data used are provided in the Cloud_cci CC4CL ATBD [D2], Section 3.
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Property | Unit | Variable name | Comment |
Latitude | Degrees North | lat | Values correspond to grid centres (-89.75°, -89.25°, -88.75°, …, 89.75°). |
Longitude | Degrees East | lon | Values correspond to grid centres (-179.75°, -179.25°, -178.75°, …, 179.75°). |
Cloud pixel count | - | pixel_count | The number of level 2 cloud pixels included in the averaging. Totals are given for all pixels and daylight pixels. |
Liquid cloud pixel count | - | liquid_count | The number of level2 pixels, classified as liquid water cloud, included in the averaging. Totals are given for all pixels and daylight pixels. |
Ice cloud pixel count | - | ice_count | The number of level2 pixels, classified as ice water cloud, included in the averaging. Totals are given for all pixels and daylight pixels. |
Cloud fractional cover | - | cfc | The cloud fractional-area cover, defined as the fraction of level 2 pixels within each level 3 grid cell flagged as cloudy. |
Cloud-top pressure | hPa | ctp | The pressure at the cloud top, as determined from thermal infrared emission. This value is directly related to cth and ctt by ECMWF ERA profiles. |
Cloud-top height | km | cth | The height of the cloud top above mean sea level, determined from thermal infrared emission. This value is directly related to ctp and ctt by ECMWF ERA profiles. |
Cloud-top temperature | K | ctt | The temperature at cloud top, determined from thermal infrared emission. This value is directly related to ctp and cth by ECMWF ERA profiles. |
Cloud effective radius | µm | cer | The effective radius of cloud droplets or ice crystals. |
Cloud optical thickness | - | cot | The column optical thickness at a wavelength of 500 nm. |
Liquid water path | gm-2 | lwp | The column mass of liquid cloud water. |
Ice water path | gm-2 | iwp | The column mass of ice cloud water. |
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Property | Unit | Variable name | Comment |
Latitude | Degrees North | lat | Values correspond to grid centres (-89.95°, -89.85°, -89.75°, …, 89.95°). |
Longitude | Degrees East | lon | Values correspond to grid centres (-179.95°, -179.85°, -179.75°, …, 179.95°). |
Cloud pixel count | - | pixel_count_day | The number of level 2 cloud pixels included in the averaging. Totals are given for daylight and night pixels separately. |
Liquid cloud pixel count | - | liquid_count_day | The number of level2 pixels, classified as liquid water cloud, included in the averaging. Totals are given for daylight and night pixels separately. |
Ice cloud pixel count | - | ice_count_day | The number of level2 pixels, classified as ice water cloud, included in the averaging. Totals are given for daylight and night pixels separately. |
Cloud fractional cover | - | cfc_day | The cloud fractional-area cover, defined as the fraction of level 2 pixels within each level 3 grid cell flagged as cloudy. |
Cloud-top pressure | hPa | ctp_day | The pressure at the cloud top, as determined from thermal infrared emission. This value is directly related to cth and ctt by ECMWF ERA profiles. |
Cloud-top height | km | cth_day | The height of the cloud top above mean sea level, determined from thermal infrared emission. This value is directly related to ctp and ctt by ECMWF ERA profiles. |
Cloud-top temperature | K | ctt_day | The temperature at cloud top, determined from thermal infrared emission. This value is directly related to ctp and cth by ECMWF ERA profiles. |
Cloud effective radius | µm | cer_day | The effective radius of cloud droplets or ice crystals. |
Cloud optical thickness | - | cot_day | The column optical thickness at a wavelength of 500 nm. |
Liquid water path | gm-2 | lwp_day | The column mass of liquid cloud water. |
Ice water path | gm-2 | iwp_day | The column mass of ice cloud water. |
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Attribute name | Description |
title | Descriptive title of the file contents |
Project | "Climate Change Initiative-European Space Agency" |
product_version | The version number of the product |
conventions | Lists the naming and meta data conventions used |
standard_name_vocabulary | Defines the standard name convention used |
Institution | The source institution of the data |
Source | The source (level 1) data used in the product |
geospatial_lon_resolution | The grid spacing in the longitude axis |
geospatial_lat_resolution | The grid spacing in the latitude axis |
geospatial_lon_min | The minimum longitude covered by the product |
geospatial_lon_max | The maximum longitude covered by the product |
geospatial_lat_min | The minimum latitude covered by the product |
geospatial_lat_max | The maximum latitude covered by the product |
spatial_resolution | Alternative description of the spatial grid used. |
geospatial_vertical_min | Definition of vertical grid used (0 indicated no vertical grid) |
geospatial_vertical_max | Definition of vertical grid used (0 indicated no vertical grid) |
Platform | Satellite platform from which observations originated |
Sensor | Satellite sensor which made the observations used |
creator_email | |
creator_url | |
date_created | ISO date and time string of processing time of the particular file |
creator_name | Alternative for institution |
time_coverage_duration | ISO time string defining temporal coverage of the product |
time_coverage_resolution | ISO time string defining temporal resolution of the product |
references | Link to further information about the product |
history | Brief description of provenance of the product |
summary | Brief description of product contents |
keywords | List of keywords (for data discovery) |
comment | Any further comments on the product not covered by other fields |
license | License conditions of the product |
cdm_data_type | Common Data Model Data Type used in the NetCDF file |
keywords_vocabulary | The standard list from which the keywords have been extracted |
naming_authority | ID string of the institution naming product (and contents) |
tracking_id | An ISO Universally Unique Identifier (UUID) number for the file |
id | A human readable identifier of the product |
time_coverage_start | ISO time string of the start of the product's temporal coverage |
time_coverage_end | ISO time string of the end of the product's temporal coverage |
inputfilelist | List of the primary input files used to create the product |
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