Analysis of the Anomalous Signals near the Tropopause before the Overshooting Convective System Onset over the Tibetan Plateau

Figure 9

The composites of longitude-pressure cross section of (a, b, c, d) temperature anomaly (units: K, color contours) and potential temperature (units: K, black lines, contour interval: 5 K), and (e, f, g, h) static stability anomaly (units: K/hPa) at 34°N for the (a, e) 3rd day, (b, f) 2nd day, (c, g) 1st day, and (d, h) 0 day before the OCS onset for 41 OCS events. The black dotted areas indicate that the anomalies are statistically significant at a 95% confidence level (based on a two-sided Student’s t-test). The red lines show the contours of 1, 2, and 3.5 PV units.