GEOG 2505 Lecture Notes - Lecture 8: Fluid Parcel, Lapse Rate
17 Sep 2018
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Quiz i is due sunday, september 30 at 11:59 p. m. Problem set i is due sunday, september 30 at 11:59 p. m. Temperature change due to the expansion of air (rising to 850 mb / 5000 feet). Adiabatic change refers to the change in temperature solely due to the expansion (rises) or compression (descends) of air; no external source of heating or cooling is involved. The rate at which rising air parcels cool is influenced by the moisture in the atmosphere. Dry adiabatic lapse rate (dalr) does not involve phase changes due to its water content (evaporation or condensation), so a rising air parcel cools faster on its ascent. Wet or moist adiabatic lapse rate (walr) involves a phase change in its water content (usually condensation as the air rises), which releases latent heat, so the air parcel cools at a slower rate as it ascends.
