A modeling study of the effect of the Andes on the summertime circulation of tropical South America

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Abstract

A simple linear two level model of the atmosphere is developed. By blocking the lower layer of the model with a meridional wall, the interaction between diabatic forcing centered in the Amazon basin and the Andes is studied. This forcing can be considered a source of Rossby waves that scatter from the above partial barrier. The scattering process is examined analytically by making the long-wave approximation. Numerical solutions without the long-wave approximation are then considered and the effects of the above scattering process are examined. the upper level circulation is shown to be qualitatively similar to that obtained without a barrier. The low-level circulation west of the barrier is weak in the winds and consists of a positive geopotential response centered at approximately 30°S. To the east, the circulation near the barrier shows similarity to models of the Somali jet. The model produces quite strong trade winds and places a low-pressure center in approximately the position where one is actually observed. -from Author

Original languageEnglish (US)
Pages (from-to)3344-3362
Number of pages19
JournalJournal of the Atmospheric Sciences
Volume46
Issue number21
StatePublished - 1989

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Middle East
South America
Atmosphere
Pressure
modeling
scattering
trade wind
Rossby wave
geopotential
low pressure
effect
atmosphere
basin

ASJC Scopus subject areas

  • Atmospheric Science
  • Medicine(all)

Cite this

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title = "A modeling study of the effect of the Andes on the summertime circulation of tropical South America",
abstract = "A simple linear two level model of the atmosphere is developed. By blocking the lower layer of the model with a meridional wall, the interaction between diabatic forcing centered in the Amazon basin and the Andes is studied. This forcing can be considered a source of Rossby waves that scatter from the above partial barrier. The scattering process is examined analytically by making the long-wave approximation. Numerical solutions without the long-wave approximation are then considered and the effects of the above scattering process are examined. the upper level circulation is shown to be qualitatively similar to that obtained without a barrier. The low-level circulation west of the barrier is weak in the winds and consists of a positive geopotential response centered at approximately 30°S. To the east, the circulation near the barrier shows similarity to models of the Somali jet. The model produces quite strong trade winds and places a low-pressure center in approximately the position where one is actually observed. -from Author",
author = "Richard Kleeman",
year = "1989",
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journal = "Journals of the Atmospheric Sciences",
issn = "0022-4928",
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AU - Kleeman, Richard

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N2 - A simple linear two level model of the atmosphere is developed. By blocking the lower layer of the model with a meridional wall, the interaction between diabatic forcing centered in the Amazon basin and the Andes is studied. This forcing can be considered a source of Rossby waves that scatter from the above partial barrier. The scattering process is examined analytically by making the long-wave approximation. Numerical solutions without the long-wave approximation are then considered and the effects of the above scattering process are examined. the upper level circulation is shown to be qualitatively similar to that obtained without a barrier. The low-level circulation west of the barrier is weak in the winds and consists of a positive geopotential response centered at approximately 30°S. To the east, the circulation near the barrier shows similarity to models of the Somali jet. The model produces quite strong trade winds and places a low-pressure center in approximately the position where one is actually observed. -from Author

AB - A simple linear two level model of the atmosphere is developed. By blocking the lower layer of the model with a meridional wall, the interaction between diabatic forcing centered in the Amazon basin and the Andes is studied. This forcing can be considered a source of Rossby waves that scatter from the above partial barrier. The scattering process is examined analytically by making the long-wave approximation. Numerical solutions without the long-wave approximation are then considered and the effects of the above scattering process are examined. the upper level circulation is shown to be qualitatively similar to that obtained without a barrier. The low-level circulation west of the barrier is weak in the winds and consists of a positive geopotential response centered at approximately 30°S. To the east, the circulation near the barrier shows similarity to models of the Somali jet. The model produces quite strong trade winds and places a low-pressure center in approximately the position where one is actually observed. -from Author

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