气团源地和锋面带 Ang onesand anticyclones Arctic source Group III Ar Continental polar source region Subsidence Group (Land) II MT M tropical source 23与 source region Vertical mIXing vitim Equatorial trough ITC equatorial source convection ME source Maritime (Land) tropical MT source region source source Subsidence→ (Water) Group MP source Antarcti source re Gro气团源地和锋面带