lapse rate

American  

noun

Meteorology.

1. the rate of decrease of atmospheric temperature with increase of elevation vertically above a given location.

---

lapse rate British  

noun

1. the rate of change of any meteorological factor with altitude, esp atmospheric temperature, which usually decreases at a rate of 0.6°C per 100 metres ( environmental lapse rate ). Unsaturated air loses about 1°C per 100 m ( dry adiabatic lapse rate ), whereas saturated air loses an average 0.5°C per 100 m ( saturated adiabatic lapse rate )

---

lapse rate Scientific  

/ lăps /

1. The rate of change of any meteorological phenomenon, especially atmospheric temperature with altitude. The lapse rate varies depending on the ground temperature, time of year (for example, in the Northern hemisphere it is lower in the winter), whether the air is over land or ocean water, and what the degree of moisture is.

2. ◆ The dry adiabatic lapse rate is the lapse rate of a dry mass of air which expands and cools as it rises. This rate is typically −9.8°C (−14.36°F) per 1,000 m (3,280 ft).

3. ◆ The saturated adiabatic lapse rate is the lapse rate of a wet mass of air, which slows down once the dew point has been reached and condensation has started to form. This rate ranges from 4°C (39.2°F) per 1,000 m (3,280 ft) to 9°C (48.2°F) per 1,000 m (3,280 ft).

---

Etymology

Origin of lapse rate

First recorded in 1915–20

Example Sentences

Generally, for every 1,000 feet you gain, the temperature can drop from around 3½ to 5 degrees, something meteorologists call “environmental lapse rate.”

From Los Angeles Times

The number also allowed the team to calculate the “lapse rate,” or the rate at which air temperatures fall with height, an important damper on climate change.

From Science Magazine

The lapse rate is “always buffering against changes in the surface temperatures,” Russell says.

From Science Magazine

This is called the lapse rate.

From Los Angeles Times

At Genworth, McInerney says, the lapse rate is only 0.7%, which seems to be close to the industry average.

From Los Angeles Times