12/21/2024
Boundary Layer Development Over the Eastern Pacific Ocean.
Almeyda, Guillermo Felix
Abstract
A model of the marine boundary layer has been developed to study air-sea interactions during El Nino -Southern Oscillation (ENSO) and the ANTI-ENSO episodes. The model considers a marine boundary layer that grows by gaining water v***r from the ocean at its lower boundary and entrainment of overlying air at its upper boundary. This layer moves horizontally at a constant wind speed over an ocean initially colder than the overlying air. The sea surface temperature can either change or remain constant. It is assumed that the air temperature at sea level must be equal to the sea surface temperature during the whole process. In addition when no cloud is formed, the top boundary must be saturated (100% relative humidity) and contain some haze, and when a non-precipitating stratus cloud has formed, the cloud top temperature must be equal to the wet bulb temperature of the overlying air. The potential temperature, mixing ratio and liquid water content profiles of the marine boundary layer are calculated at the end of 1 hour time steps. The top boundary height, the cloud base height, the cloud depth, and the inversion intensity are evaluated as a function of time. This model has been applied to simulate properties of the marine boundary over the Southeastern Pacific off the coasts of Chile, Peru, and Ecuador. A well developed marine layer with a greater depth and a thicker cloud layer results from ENSO conditions, in contrast to a reduced well-mixed layer with thin stratus, capped by a stronger inversion for the ANTI-ENSO conditions. These results suggest that the evolution of the marine boundary layer is governed by both ev***ration from the ocean and the entrainment of overlying air into the marine boundary layer.
Publication:
Thesis (PH.D.)--UNIVERSITY OF NEVADA, RENO, 1988.Source: Dissertation Abstracts International, Volume: 49-08, Section: B, page: 3254.
Pub Date: 1988 Bibcode: Keywords:
Physics: Atmospheric Science; Air Water Interactions; Atmospheric Boundary Layer; Marine Environments; Mixing Height; Ocean Models; Ceilings (Meteorology); El Nino; Entrainment; Ev***ration; Sea Surface Temperature; Southern Oscillation; Water V***r; Geophysics
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