Global and regional distribution of radiative forcing due to carbon dioxide, methane, and black carbon derived from GOSAT-FTS, MODIS and OMI data
Abstract
Radiative forcing is a key parameter in quantifying the effect of climate change. The global mean radiative forcing evolution consists of a steadily increasing contribution due to the well-mixed greenhouse gases and other factors such as aerosol, clouds, ozone etc. In this study, we analyzed the global and regional distribution of CO2 and CH4 concentrations retrieved from Greenhouse Gases Observing SATellite-Fourier Transform Spectrometer (GOSAT-FTS) observations for a period from June 2009 to June 2011. The annual global mean CO2 shows 379.1 ppm for the whole period, showing 377.6 ppm and 380.2 ppm in 2009 and 2010, respectively. However, it is found that CO2 data from shortwave-infrared (SWIR) measurements of GOSAT-FTS tend to show negative bias of 2 to 3 % compared to the other satellite retrievals and ground-based measurements. In case of CH4, the annual global mean value shows 1764.7 ppb for the whole period, is shows 1762.0 ppb and 1766.8 ppb in 2009 and 2010, respectively. When considering regional and seasonal changes in CO2 and CH4 concentrations from 360 to 390 ppm and from 1669 to 1856 ppb, respectively. Their radiative forcing at top-of-atmosphere (TOA) is estimated to range from 1.0 to 1.4 W/m2 and from 0.79 to 0.85 W/m2, respectively. The radiative forcing of black carbon (BC) is also estimated by using BC aerosol optical depth (AOD) from an algorithm using Moderate Resolution Imaging Spectroradiometer (MODIS) and Ozone Monitoring Instrument (OMI) measurements using the method from Kim et al. (2007). The radiative forcing of BC is found to be 0.4 W/m2 at TOA for the same period.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.A13E0405L
- Keywords:
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- 1640 GLOBAL CHANGE / Remote sensing;
- 3359 ATMOSPHERIC PROCESSES / Radiative processes