Neco 2020 Geography Question 45

A weather station recorded the following data for a particular day: maximum temperature \(34\)°C, minimum temperature \(24\)°C, average relative humidity \(70\%\), and sunshine duration \(8\) hours.\n(a) Compute the mean temperature.\n(b) Using the Magnus formula \(e_s = 0.6108\,\exp\left(\frac{17.27\,T}{T+237.3}\right)\) (where \(e_s\) is the saturation vapour pressure in kPa and \(T\) is temperature in °C), calculate the saturation vapour pressure at the mean temperature.\n(c) Determine the actual vapour pressure using the average relative humidity.\n(d) Find the vapour pressure deficit (VPD).\n(e) Estimate the daily evapotranspiration (ET) in millimetres using the empirical relation \(ET = 0.1\,\text{VPD}\,N\), where \(N\) is sunshine hours.