Monsoon circulation induced variability in total column ozone over India

The intra-seasonal variability of daily total column ozone (TCO) over 12 Indian stations has been studied. Total Ozone Mapping Spectrometer daily data from May to September for five years (1998–2002) have been utilized in the study. The power spectrum analysis of daily TCO data showed three dominant modes of period 3–8 days (synoptic), 10–20 days (quasi biweekly, qbw) and 30–60 days (Madden Julian Oscillation, MJO), similar to that found in the Indian Summer Monsoon Rainfall. Mean spatial distribution of the activities of these intra-seasonal modes in TCO variability over the Indian region has been studied. The spatial distribution of the synoptic mode shows the strongest activity over central India. The qbw mode shows strongest activity over northwest India. The MJO mode shows strongest activity over northern most and southern most parts of India.