Question

2) ~Fred Problem 4.2. Estimate the west-east component of the geostrophic wind, u, in m s1 for the three latitude bands 15-30°N, 30-45°N, and 45-60°N for January. To do this, assume that pressure gradients computed from values in Tables 4.2 and 4.3 apply to the mid-point of each latitude band. For example, the gradient computed using pressures at 30°N and 45°N can be associated with latitude 37.5° and taken to represent an average for the 15° wide band. Be sure to state whether the wind is moving from west to east or from east to west. Convert your largest number to miles per hour. Recall we did a worked example in class on 14 March. Watch units Table 4.2. Model Atmosphere at 5 km Altitude for January (Northern Hemisphere) Latitude 15 30 45 60 Pressure (mb) 559 552 531 516 Temperature Densit (Kelvin) 271 262 g cm- 7.20x104 7.34x104 7.41x104 7.46x104 250 241

Answer 1

Given The Thnee taltade bordls 15-30 M 30-45 N 45-60 N o9m Calculation cd wind velocity Jai a give TTtadke is GWS QSL Sin(lat) 下 ne Vawe Wind Spea! ) nSi Apme ssine do iTude ba mid Poin AP: (559-559)mb: 구mb 700 Pa

-3 d = 5 km : 5000 m Sir, laa-5。) 46x10-5 (38 12 x10 0-45 AN 乂 Q100 1.4#x10-5 0.6087 07

3.9t7 0 mid Poi O 0 i.e 52.5 x 150 o 1.4#x lo-5 0.79 33 o 435 5000 15 lo ms 306 3.483×10 ms BeCouse e have esed the west-east Compoment est 1o ea f the eostiopke hind, the ind is moving niom wl