Influence of Stratospheric Intrusion on the Surface Ozone Levels in India

Figure 4

(a) Geopotential height (meter) map at 850 hPa, (b) vertical pressure velocity (Pa⋅s⁻¹) at the tropopause, (c) relative humidity (%) at 300 hPa pressure level, (d) potential vorticity at the tropopause, (e) 5-day back trajectories at 1000 hPa (pink), 925 hPa (red), and 850 hPa (green) pressure levels, (f) tropospheric CO (10⁻¹ ppmv), (g) CH₄ (ppmv), (h) NO₂ (10¹⁵  molecules⋅cm²), and (i) fire counts at Pune on 24 November 2006 (sources of data: NCEP Reanalysis, ECMWF, TES, OMI, and ASTR world fire atlas).

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