Consider the following statements about the causes of ground surface inversion of temperature : 1. Ground surface inversion is also termed as radiation inversion. 2. The existence of negative lapse rate results in surface inversion. Which of the statements given above is/are correct ?

Ground surface inversion occurs on long, clear, calm winter nights when the ground loses heat rapidly through long-wave radiation, cooling the air immediately above it more than the air higher up — this is correctly called radiation inversion, so statement 1 is correct. Under normal conditions, temperature falls with height (positive lapse rate); when temperature INCREASES with height, the lapse rate becomes negative, which is precisely the definition of an inversion. So statement 2 is also correct. Both statements correctly describe surface (radiation) inversion of temperature.