(a) (i) Define the term "dry adiabatic lapse rate" and show how temperature varies with height under dry adiabatic atmospheric conditions. (3 marks) (ii) Describe the three atmospheric stability conditions and show diagrammatically how they relate to the dry adiabatic lapse rate. (iii) Explain briefly the effect on pollution dispersion. ( 8 marks) (3 marks) (b) Holland's equation is normally used to determine the rise of plumes from a given stack height, assuming neutral stability conditions. It is given by the expression: h=uwsds(1.5+0.026dsPa(TsTsTa)) Where: h= plume rise (in metres); ws= velocity at exit from stack (ms1);ds= stack diameter (metres); u= wind velocity (m/s);Pa= atmospheric pressure in millibars; Ts = temperature of stack gas (in degrees Kelvin); Ta= temperature of atmosphere (in Kelvin). Consider a stack emitting NO from a power plant. If the rise of the pollution plume is h=125m, what is the temperature of the exited gas? (6 marks) You may assume: Atmospheric pressure P0 (in millibars) =1000 millibars; exit velocity ws of the polluted gas is 10m/s; diameter ds of the stack is 2m; temperature of atmosphere is 15C and the mean wind speed is 2m/s. (c) Define the term "aerosols" and outline briefly their effect in the Earth's atmosphere