Diurnal variations of the methane mixing ratio for two seasons calculated from the Mars Regional Atmospheric Modeling System sampled at the Curiosity rover location for sol 305 assuming a constant methane surface flux of 1.8 × 10⁻⁶ kg m⁻² s⁻¹ emanating from locations ~1 grid point (2.96 km) to the NE, SE, SW, and NW of the rover. Vertical bars represent the amplitude of the diurnal cycle. The average local time of maximum abundance is indicated in the label at the top of the vertical bars. Thick horizontal lines indicate the diurnally averaged value.