Observations -Zonal mean fields Review Temperature(温度场) 310 -Annual 300 ---DJF --JJA 290 280 Strong temperature 言 270 gradient at midlatitudes, 260 with obvious seasonal 25 variation in the Northern S.P. 60S 40S 20S E.Q. 20N 40N 60N N.P. 270 Hemisphere compared to ·。Ahrual° that in the Southern ---DJF 260 -JJA Hemisphere. 250 名 240 230 S.P 60S 40S 20S E.Q. 20N 40N 60N N.P. 授课教师：张洋8授课教师：张洋 8 \ n Temperature (温度场) S.P. 60S 40S 20S E.Q. 20N 40N 60N N.P. 250 260 270 280 290 300 310 Surface air temperature (K) Annual DJF JJA S.P. 60S 40S 20S E.Q. 20N 40N 60N N.P. 230 240 250 260 270 Temp. (K) at 500 hpa Annual DJF JJA Strong temperature gradient at midlatitudes, with obvious seasonal variation in the Northern Hemisphere compared to that in the Southern Hemisphere. Observations -Zonal mean fields Review