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ATBD - GHG-CCI

ATBD - GHG-CCI

ESA Climate Change

ESA Climate Change Initiative (CCI) Algorithm Theoretical Basis Document Version 2 (ATBDv2) – UoL-FP for the Essential Climate Variable (ECV) Greenhouse Gases (GHG) Page 4 Version 2 – Draft 1 18 March 2013 Document History: Version Revision Date Description/Comments 1.0 1 28/6/2011 Initial version of ATBD 2.0 1 18/03/2013 Updated for Version 4.0 of GOSAT retrievals The research described in this document was carried out at the University of Leicester, Leicester, UK. Copyright 2013. All rights reserved.

ESA Climate Change Initiative (CCI) Algorithm Theoretical Basis Document Version 2 (ATBDv2) – UoL-FP for the Essential Climate Variable (ECV) Greenhouse Gases (GHG) Page 5 Version 2 – Draft 1 18 March 2013 Table of Contents 1 Introduction ...................................................................................................................... 7 1.1 Purpose .................................................................................................................... 7 1.2 Scope ....................................................................................................................... 7 2 GOSAT Overview ............................................................................................................ 7 2.1 Objectives ................................................................................................................. 7 2.2 Measurement Approach ........................................................................................... 8 2.3 Instrument Characteristics ........................................................................................ 8 2.3.1 Observing Modes ............................................................................................ 10 2.3.2 Data Product Delivery ..................................................................................... 10 2.4 L1B Processing ...................................................................................................... 11 2.4.1 Radiometric Calibration ................................................................................... 11 2.4.2 Noise ............................................................................................................... 11 3 Algorithm Description ..................................................................................................... 11 3.1 Algorithm Overview ................................................................................................ 11 3.2 Forward Model ........................................................................................................ 13 3.2.1 Solar Model ..................................................................................................... 13 3.2.2 Radiative Transfer ........................................................................................... 13 3.2.3 Instrument Model ............................................................................................. 14 3.3 State Vector ............................................................................................................ 16 3.3.1 Description of Carbon Dioxide Retrievals ........................................................ 16 3.3.2 Description of Full-Physics Methane Retrievals .............................................. 20 3.3.3 Description of Proxy Methane Retrievals ....................................................... 21 3.4 Screening ............................................................................................................... 23 3.4.1 Pre-Processing Screen ................................................................................... 23 3.4.2 Cloud Screen ................................................................................................... 23

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