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Variations in atmospheric Carbon Dioxide and its association with rainfall and vegetation over India

Tiwari, YK and Revadekar, JV and Ravi Kumar, K (2013) Variations in atmospheric Carbon Dioxide and its association with rainfall and vegetation over India. Atmospheric Environment, 68. pp. 45-51.

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In this paper we have studied variability and growth rate of surface observed atmospheric Carbon Dioxide (CO2) concentrations over Cape Rama, west coast of India and its association with rainfall and vegetation over this region. Cape Rama is a maritime site which experiences a seasonal reversal wind pattern receiving air masses having marine (continental) signatures during summer (winter) monsoon season. This study reveals that summer monsoon (JJAS) precipitation and monthly values of atmospheric CO2 concentration during the season are well correlated. Negative correlations are seen with CO2 concentrations of concurrent months of the season as well as subsequent months. However the magnitudes of correlation coefficients are decreased till hot pre-monsoon season (MAM). Annual cycle and interannual variability show negative relationship between CO2 concentration and vegetation over the region. CO2 concentration shows increasing trend and NDVI shows decreasing trend. However, the magnitude of increasing trend of CO2 concentration is higher. Amplitude of decreasing phase of vegetation is higher than the amplitude of increasing phase. Though the results show certain link between CO2 and climate variability, further examination with dense and longer data may be needed to confirm the result.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Air mass; Annual cycle; Atmospheric carbon dioxide; Atmospheric CO; Cape Rama India; Climate variability; Correlation coefficient; Interannual variability; Maritime sites; Monsoon season; Negative correlation; Pre-monsoon; Summer monsoon; West coast; Wind patterns, Atmospheric chemistry; Atmospheric composition; Atmospheric thermodynamics; Climatology; Rain; Vegetation, Carbon dioxide, carbon dioxide; rain, air mass; annual cycle; annual variation; carbon dioxide; coastal zone; concentration (composition); correlation; rainfall; seasonal variation; vegetation index, article; atmosphere; concentration (parameters); growth rate; India; priority journal; seasonal variation; summer; surface property; vegetation; winter, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 11 Jun 2014 09:31
Last Modified: 11 Jun 2014 09:31

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