Abstract
Abstract. Inter-comparison between National Oceanic and Atmospheric Administration Carbon Tracker (NOAACT) CO2 with satellite observations were carried out in this study. The satellite observations used here are mid troposphere CO2 based on Atmosphere Infrared Sounder (AIRS) on board NASA’s Aqua and lower troposphere CO2 based on Greenhouse-gas Observing Satellite (GOSAT) of Japanese Aerospace Exploration Agency (JAXA). There exists good agreement between the seasonal cycles as estimated by NOAACT and Satellite observations. The mid troposphere CO2 exhibits distinct annual cycle in the northern hemisphere with positive detrended value during January–June and negative values during July–December. In the southern hemisphere, the annual cycle is less prominent and opposite phase with respect to the northern hemisphere. The lower tropospheric CO2 in both the hemispheres exhibits mixed signature of annual and semi-annual cycle. The amplitudes of the variability are significantly larger in the northern hemisphere than the southern hemisphere. The inter-annual variability of annual growth rates from the NOAACT is comparable with satellite observations however NOAACT could not resolved the spatial patterns of long-term growth rate as observed in the satellite observations.
Highlights
Carbon dioxide (CO2) is a major greenhouse gas in our atmosphere
The annual growth rates (AGR) of CO2 were calculated by subtracting the value for the January of a given year from the January value of the year
Mean of the mid-troposphere CO2 over the tropical regions based on National Oceanic and Atmospheric Administration Carbon Tracker (NOAACT) and Atmosphere Infrared Sounder (AIRS) (Figure 1) suggest good coherences between both the data sets
Summary
Its rapid increasing rate is the major concern about today’s global warming and climatic change It has increased by 40% since pre-industrial times, from 280 parts per million by volume (ppmv) to more than 391 ppmv in 2012 (Trends in Carbon Dioxide-NOAA/ESRL). The atmospheric transport is simulated using the global two-way nested Transport Model 5(TM5) and is forced by the time-varying meteorology from the European Centre for Medium-Range Weather Forecasts (ECMWF) data It was first released in February 2007(CT2007). The data were available at the public domain (ftp://aftp.cmdl.noaa.gov/products/carbontracker) This product has been used by Policy makers, industry, scientists and the public to make decisions to limit greenhouse gas levels in the atmosphere. This research has the aim to evaluate NOAA CT by comparing it with AIRS and GOSAT observations
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