Amir Mohsen
متخصص بخش هواشناسی
سلام آبتین عزیز
توجه داشته باشید که نقشه ها انومالی دمای تراز 850 میلی بار جو رو نشون میدن که با سطح زمین در نواحی کم ارتفاع اختلاف زیادی داره ، بعد هم آنومالی به فارنهایت هست نه دمای واقعی!!!!
در واقع یک جور انحراف معیار میشه گفت هست
Upper Air Data Details
Upper air data is taken from balloons which measure upper air conditions over a particular location. The plots of data include plots on common mandatory and height levels, contours of various upper air parameters and a set of sounding plots for all US sites. These data update once every 12 hours at around 9:45 EST.
Meteorology uses pressure as the vertical coordinate and not height. This works out better for thermodynamic computations that are done on a regular basis. Pressure decreases in the atmosphere exponentially as height increases reaching 0 pressure in space. The standard unit of pressure is millibars (mb or hectopascals-hPa) of which sea level is around 1015 mb. Standard pressure levels and approximate heights:
| Pressure | Approximate Height | Approximate Temp | ||
| Sea level | 0 m | 0 ft | 15 C | 59 F |
| 1000 mb | 100 m | 300 ft | 15 C | 59 F |
| 850 mb | 1500 m | 5000 ft | 5 C | 41 F |
| 700 mb | 3000 m | 10000 ft | -5 C | 23 F |
| 500 mb | 5000 m | 18000 ft | -20 C | -4 F |
| 300 mb | 9000 m | 30000 ft | -45 C | -49 F |
| 200 mb | 12000 m | 40000 ft | -55 C | -67 F |
| 100 mb | 16000 m | 53000 ft | -56 C | -69 F |
