Abstract
The present study shows spatio-temporal variability in carbon dioxide \((\hbox {CO}_{2})\) in the mid-tropospheric region over India (0–32\(^{\mathrm{o}}\hbox {N}\), 60–100\(^{\mathrm{o}}\hbox {E}\)) during 2003–2011. The \(\hbox {CO}_{2}\) data used in the study is retrieved from Atmospheric Infra-Red Sounder (AIRS). Analysis of 9 yrs of data shows that the \(\hbox {CO}_{{2}}\) exhibits a linear increasing trend of 2.01 ppm/year. Besides displaying the linear increasing trend, data show strong seasonal and annual variability. Concentration of \(\hbox {CO}_{{2}}\) is observed to be highest around April–May (summer months), which decreases by 4–5 ppm during the monsoon months. Seasonal decrease in \(\hbox {CO}_{2}\) concentration appeared to be influenced by the monsoonal activity. Low OLR (proxy of convection) associated with high rainfall during summer monsoon via increasing vegetation index (NDVI) appears to be the primary cause for the seasonal decrease in \(\hbox {CO}_{{2}}\) through photosynthesis. Correlation coefficient between \(\hbox {CO}_{{2}}\) and NDVI is of the order of –0.90 suggesting vegetation as a seasonal sink of \(\hbox {CO}_{{2}}\). Decrease in \(\hbox {CO}_{{2}}\) concentration takes place at a delay of 2–3 months of rainfall. However, convection seems to be another component, which causes uplifting of \(\hbox {CO}_{{2}}\) during dry summer (April and May) making high concentration in the mid-troposphere as shown by increase in the planetary boundary layer (PBL) height in this period. Eastward propagating intra-seasonal oscillations with period 30–40 days in OLR anomalies are found to modulate (with a fluctuation of 1–2 ppm) mid-tropospheric \(\hbox {CO}_{{2}}\). Analysis of seasonal anomalies in \(\hbox {CO}_{{2}}\) over four different regions (northern, southern, western and eastern) of India is also being investigated. The regional variability of \(\hbox {CO}_{2}\) in northern region show marginal larger values suggesting more anthropogenic activities especially during late winter.
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Acknowledgements
Satellite data are obtained from http://airs.jpl.nasa.gov/. Present work is supported by ISRO/DOS, Government of India, through a research project under CAWSES-II India Program. Planetary boundary layer (PBL) height is takenfrom https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.html. Authors are thankful to Dr Vinay Kumar for his help in coding for NDVI and other parameters.
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Gupta, A., Dhaka, S.K., Matsumi, Y. et al. Seasonal and annual variation of AIRS retrieved \(\hbox {CO}_{{2}}\) over India during 2003–2011. J Earth Syst Sci 128, 92 (2019). https://doi.org/10.1007/s12040-019-1108-7
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DOI: https://doi.org/10.1007/s12040-019-1108-7