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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 6 Version 2 – Draft 1 18 March 2013 3.4.3 Post-Processing Screen .................................................................................. 23 4 References .................................................................................................................... 25 APPENDICES ....................................................................................................................... 27 Appendix A Acronyms .................................................................................................... 27 Appendix B OCO ATBD ................................................................................................. 27 LIST OF FIGURES Figure 2-1. TANSO-FTS instrument design showing the major optic components and optical path [Kuze, 2011]. Figure 2-2. Diagram illustrating the observation points of GOSAT in 5-point mode [Hamazaki, 2006]. Figure 3-1. ILS used in the retrievals for each GOSAT spectral band with different wavenumbers given. Figure 3-2. Validation of a priori surface pressure with in-situ ground based measurements from ARM instruments in Southern Great Plains/USA and Black Forest/Germany. Figure 3-3. Gaussian profiles based on the height and thickness described for various regions by Eguchi et al, 2007. Table 3-1. State Vector for CO 2 retrievals. Table 3-2. State Vector for CH 4 retrievals. LIST OF TABLES Table 3-3. Description of additional parameters used in the Carbon Dioxide post-processing screen.

ESA Climate Change Initiative (CCI) Algorithm Theoretical Basis Document Version 2 (ATBDv2) – UoL-FP for the Essential Climate Variable (ECV) Greenhouse Gases (GHG) Page 7 Version 2 – Draft 1 18 March 2013 1 Introduction 1.1 Purpose This Algorithm Theoretical Basis (ATB) document describes the algorithm used to retrieve the column averaged dry air mole fraction of carbon dioxide, X CO2 , and of methane, X CH4 , as well as other quantities included in the Level 2 Product generated from GOSAT spectra. This document explains the sources of input data required for the retrievals and the physical theory and mathematical background that underlies the information within the retrievals. Additionally, this document provides details of the retrievals implementation, assumptions and limitations of the approach used. 1.2 Scope This document covers the algorithm theoretical basis for the parameters of the Level 2 Products that are routinely retrieved at the University of Leicester. Section 1 provides the purpose and scope of the document. Section 2 explains the mission and instrument. Section 3 describes the processing and algorithm and section 4 gives the references for publications cited in the document. 2 GOSAT Overview 2.1 Objectives Human activities such as fossil fuel combustion or land use change have led to a dramatic increase in atmospheric CO 2 concentrations from a pre-industrial level of 280 parts per million (ppm) to more than 386 ppm today. Atmospheric levels of methane (CH 4 ) have risen also dramatically over the last 300 years from 400-700 parts per billion (ppb) to 1774 ppb [IPCC, 2007]. Networks of surface in situ greenhouse gas sensors provide accurate measurements of the global greenhouse gas concentrations and their large scale temporal, seasonal and latitudinal variations. However, these are too sparse to allow the establishment of sub-continental carbon budgets and key questions remain unresolved, limiting the accuracy of future climate change forecasts and the ability to manage future levels of atmospheric CO 2 and CH 4 . Satellites observations, if acquired with high accuracy and precision, have the potential to overcome such limitations by providing globally denselysampled datasets of column CO 2 and CH 4 . The first observations of greenhouse gases from a dedicated satellite sensor are now available with the launch of the Japanese Greenhouse gas Observing SATellite (GOSAT) on 23 January 2009. GOSAT provides global measurements of total column CO 2 and CH 4 from its shortwave infrared (SWIR) bands and of mid-tropospheric sub-columns from its thermal- IR bands. The mission aims; to monitor the density of greenhouse gases precisely and frequently worldwide, to study the absorption and emission levels to greenhouse gases per continent or large country over a certain period of time, and to develop and establish advanced technologies that are essential for precise greenhouse gas observations.

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