Question

it is 29.6°c at sea level. the environmental lapse rate between sea level and 1500m is 5.5°c/1000m the environmental lapse rate between 1500m and 4000m is 12.1°c/1000m the normal lapse rate exists above 4000m. what will the temperature be at 6000m

Answer 1

The lapse Rate refers to the rate of decline in air temperature with relation to increase in altitude. The lapse Rate for 0-1500 meters and 1500-4000 meters are give. The Normal lapse Rate is 6.5°C per 1000 meters. So we can calculate the temperature at 6000 meters.

The surface temperature is = 29.6°C at sea level

The lapse Rate upto 1500 meter= 5.5°C/1000 meters

So the decline in temperature would be 5.5°C/1000×1500 = 8.25°C

So the temperature at 1500 meter is 29.6-8.25= 21.35°C

Now lapse Rate 1500-4000 meter is 12.1°C/1000meters

Decline in temperature would be

12.1°C/1000×2500= 30.25°C

So Temperature at 4000meters is 21.35-30.25= -8.9°C

Above 4000 meters, Normal Lapse rate acts that is 6.5°C/1000 meters

So decline in temperature would be

6.5°C/1000×2000= 13°C

So temperature at 6000 meters would be

-8.9°C - 13°C = -21.9°C

So the temperature at 6000 meters would be -21.9°C