Characteristics and Development Mechanisms of Northeast Cold Vortices

Figure 9

Composite fields of temperature (red contours, unit: °C), wind (vectors), and geopotential height (black contours, unit: gpm) for NCVs in (a) May-September, (b) late spring, and (c) early autumn, respectively. Areas with grey color are those reaching 95% significance test; a darker area at the southwest of the maps is the Qinghai Tibet plateau. A and C indicate the temperature and wind fields at 500 hPa and 850 hPa, respectively. B and D indicate the geopotential height fields at 500 hPa and 850 hPa, respectively.