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Table 1: Definition of processing levels

Processing level

Definition

Level-1b

The full-resolution geolocated radiometric measurements (for each view and each channel), rebinned onto a regular spatial grid.

Level-2 (L2)

Retrieved cloud variables at full input data resolution, thus with the same resolution and location as the sensor measurements (Level-1b).

Level-3C (L3C)

Cloud properties of Level-2 orbits of one single sensor combined (averaged) on a global spatial grid. Both daily and monthly products provided through C3S are Level-3C.

Table 2: Definition of various technical terms used in the document

Jargon

Definition

Brokered product

The C3S Climate Data Store (CDS) provides both data produced specifically for C3S and so-called brokered products. The latter are existing products produced under an independent programme or project which are made available through the CDS.

Climate Data Store (CDS)

The front-end and delivery mechanism for data made available through C3S.

OPeNDAP

“Open-Source Project for a Network Data Access Protocol” enables scientists to share data more easily over the internet. With OPeNDAP, one can access data using an OPeNDAP URL of any database server that supports OPeNDAP. It can be done via command-line, Internet browser, or a custom UI. (from https://www.earthdata.nasa.gov/engage/open-data-services-and-software/api/opendap)

JASMIN

JASMIN is a data analysis facility, which provides storage and compute facilities to enable data-intensive environmental science.

This is where the data processing takes place.

Merged version

The two platforms (Sentinel-3A/B) fly in identical, interleaved sun-synchronous orbits, such that the two SLSTR instruments provide nearly global coverage twice daily (with one day and one night overpass).

Two products are provided: The data records of each satellite (S3A and S3B) individually as well as a merged product of both for the period in which both are available (10/2018 – 06/2022). (see D4, Section 1)

TCDR

It is a consistently-processed time series of a geophysical variable of sufficient length and quality.

ICDR

An Interim Climate Data Record (ICDR) denotes an extension of TCDR, processed with a processing system as consistent as possible to the generation of TCDR.

CDR

A Climate Data Record (CDR) is defined as a time series of measurements with sufficient length, consistency, and continuity to determine climate variability and change.

Scope of the document

This document describes the systems used for delivering the satellite-based estimates of Cloud Properties (CP), Surface Radiation Budget (SRB), and Earth Radiation Budget (ERB), brokered from ESA´s Cloud_cci ATSR-AATSRv3 dataset or derived from the Sea and Land Surface Temperature Radiometer (SLSTR) specifically for the Copernicus Climate Change Service (C3S). The CP, SRB, and ERB products are produced by the Optimal Estimation of Aerosol and Cloud (ORAC) retrieval scheme, operating as the Community Cloud for Climate (CC4Cl) processor, and provided to the Climate Data Store (CDS) by the C3S. Interfaces to external data, the data processing infrastructure, and the interface to the CDS are outlined. Internal procedures for managing and communicating system maintenance and for user support are described.

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The user (customer) has the possibility to browse and search in the Copernicus Knowledge Base (CKB) (CAMS and C3S Knowledge Base (CKB)) or the Copernicus Climate Data Store desk (https://cds.climate.copernicus.eu/cdsapp#!/usersupporthelp) (Figure 5-1). This is known as the level-0 process of User Support.

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