ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from SCIAMACHY generated with the WFMD algorithm (CH4_SCI_WFMD), version 4.0
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description: The CH4_SCI_WFMD dataset comprises level 2, column-averaged dry-air mole fractions (mixing ratios) of methane (XCH4). It has been produced using data acquired from the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) on board the European Space Agency's (ESA's) environmental research satellite ENVISAT, as part of the ESA's Greenhouse Gases Climate Change Initiative (GHG_cci) project. This version of the data is version 4.0, and forms part of the Climate Research Data Package 4.The Weighting Function Modified DOAS (WFMD) algorithm is a least-squares method based on scaling pre-selected atmospheric vertical profiles. A second product is also available, which has been generated from the SCIAMACHY data using the IMAP algorithm. The data product is stored per day in separate NetCDF-files (NetCDF-4 classic model). The product files contain the key products and other information relevant for the use of the data e.g. the averaging kernels. Note that the results since November 2005 are considered to be of reduced quality in comparison to the earlier results because the extended-wavelength part (1590-1770 nm) of SCIAMACHY's channel 6, covering the methane 2v3 absorption band used for the methane retrieval, is subject to irreversible displacement damage induced by high energy solar protons, which occurs from time to time at individual detector pixels. Therefore several affected detector pixels had to be excluded for the time period since November 2005. For further information on the product, including details of the WFMD algorithm and the SCIAMACHY instrument, please see the associated product user guide (PUG) or the Algorithm Theoretical Basis Documents.
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license: LicenseDocument
  label: Under the following licence https://artefacts.ceda.ac.uk/licences/specific_licences/esacci_ghg_terms_and_conditions.pdf, appropriate use of these data may fall under any use. This message is intended as guidance, always read the full licence. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.

Product Validation and Intercomparison Report (PVIRv4)
type: Document
description: No further details.

CatalogRecord
modified: 2026-08-05T00:47:02Z
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https://fedeo.ceos.org/collections/aa09603e91b44f3cb1573c9dd415e8a8
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SCIAMACHY
type: Entity
in scheme: https://earth.esa.int/concepts/concept_scheme/instruments
type: Concept

Sample Image
type: Document
description: No further details.

U Bremen, WFMD web page
type: Document
description: No further details.

Envisat
type: Entity
in scheme: https://earth.esa.int/concepts/concept_scheme/platforms
type: Concept

EARTH SCIENCE>CLIMATE INDICATORS>PALEOCLIMATE INDICATORS>ICE CORE RECORDS>METHANE
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords

System Verification Report (SVR) CRDP#4
type: Document
description: SCIAMACHY WFM-DOAS (WFMD) XCO2 and XCH4 - No further details.

ENVISAT
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/platforms

SCIAMACHY
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments

CEDA Data Catalogue Page
type: Document
description: Detail and access information for the resource

ESA CCI Greenhouse Gases project website
type: Document
description: No further details.

EARTH SCIENCE>ATMOSPHERE>ATMOSPHERIC CHEMISTRY>CARBON AND HYDROCARBON COMPOUNDS>METHANE
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords

Product User Guide
type: Document
description: No further details.

Algorithm Theoretical Basis Document (ATBD)
type: Document
description: SCIAMACHY WFM-DOAS (WFMD) XCO2 and XCH4 - No further details.

Product Specification Document Version 3 (PSDv3)
type: Document
description: No further details.

GHG
type: Document
description: CCI Data Products webpage - No further details.

Schneising et al, 2011,'Long
type: Document
description: term analysis of carbon dioxide and methane column-averaged mole fractions retrieved from SCIAMACHY' - No further details.

EARTH SCIENCE>ATMOSPHERE>ATMOSPHERIC CHEMISTRY
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords

Comprehensive Error Characterisation Report (CECR)
type: Document
description: SCIAMACHY WFM-DOAS (WFMD) XCO2 and XCH4 - No further details.