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Preliminary retrieval of XCO2 using GOSAT observations in SWIR and IR band

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Abstract

The Greenhouse Gases Observing Satellite (GOSAT) is the first spacecraft to measure the concentration of carbon dioxide and methane, the two major greenhouse gases. The main sensor for gas observation is Thermal And Near infrared Sensor for carbon Observation – Fourier Transform Spectrometer (TANSO-FTS), which containing four observing bands, three shortwave infrared bands (Band1~3) and one infrared band (Band4). Observations in Band 2 are from reflected sunlight and they provide high sensitivity to greenhouse gases near the surface where most CO2 sources and sinks are located. However, observations in shortwave infrared are easily influenced by aerosol scattering which can lead to significant retrieval error. While, observations in Band 4 are more sensitive to greenhouse gases in the upper atmospheric layer and they are slightly affected by aerosol scattering. Here, observations in Band 2 and Band 4 are simultaneously used to retrieve CO2 concentration based on Optimal Estimate (OE) method. Retrieved XCO2 over China will be presented. As a contrast, retrieved XCO2 using Band 2 and Band 4 observations separately will be presented to show the improvement of simultaneously retrieval.

© 2015 Optical Society of America

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