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You have made measurements at the surface (10 m above the ground) and at 1 km....

You have made measurements at the surface (10 m above the ground) and at 1 km. Surface wind speed was measured as 2 m/s and the wind speed at 1000 m was measured at 9 m/s. Virtual temperature was 303 K at the surface and 292 K at 1000m. The virtual potential temperature at 1000m was 297 K. Calculate the Richardson number for the layer between the serface and 1000m. What does the Richardson number say about stability. Is it likely day or night?

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