Variability in AIRS CO2 during active and break phases of Indian summer monsoon.

Due to human activities, the atmospheric concentration of Carbon Dioxide (CO 2 ) has been rising extensively since the Industrial Revolution. Indian summer monsoon (ISM) has a dominant westerly component from ocean to land with a strong tendency to ascend and hence may have role in CO 2 distribution in lower and middle troposphere over Indian sub-continent. A substantial component of ISM variability arises from the fluctuations on the intra-seasonal scale between active and break phases which correspond to strong and weak monsoon circulation. In view of the above, an attempt is made in this study to examine the AIRS/AQUA satellite retrieved CO 2 distribution in response to atmospheric circulation with focus on active and break phase. Correlation analysis indicates the increase in AIRS CO 2 linked with strong monsoon circulation. Study also reveals that anomalous circulation pattern during active and break phase show resemblance with high and low values of AIRS CO 2 . Homogeneous monsoon regions of India show substantial increase in CO 2 levels during active phase. Hilly regions of India show strong contrast in CO 2 and vertical velocity during active and break phases. [ABSTRACT FROM AUTHOR]