# Accession Number:

## AD0668540

# Title:

## NUMERICAL STUDIES OF PLANETARY CIRCULATIONS IN A MODEL ATMOSPHERE.

# Descriptive Note:

## Scientific rept. (Final), 1 Aug 65-31 Jul 67,

# Corporate Author:

## HEBREW UNIV JERUSALEM (ISRAEL) DEPT OF METEOROLOGY

# Personal Author(s):

# Report Date:

## 1967-12-01

# Pagination or Media Count:

## 192.0

# Abstract:

The evolution of general circulation patterns has been studied on a beta-plane, by means of two-level quasi-geostrophic models, including diabatic heat sources and friction. In the first experiment the influx of heat per unit column was made proportional to the temperature difference at the ocean-air interface, and to the geostrophic wind speed at this level. The factor of proportionality was independent of the sign of the temperature difference. In the second experiment its value was reduced by a factor of 10 whenever the air temperature exceeded the ocean temperature. In the third experiment a humidity distribution, evaporation, precipitation and release of latent heat were introduced. The best results were obtained in the third experiment, in which a well-defined index cycle with a period of about 13 days occurred. Integrations were performed by means of a model without diabatic heat sources or surface friction, with initial easterly and initial westerly flow. Author

# Descriptors:

- (*EARTH(PLANET)
- ATMOSPHERIC MOTION)
- EARTH MODELS
- MATHEMATICAL MODELS
- PERIODIC VARIATIONS
- CORRELATION TECHNIQUES
- VELOCITY
- CONVECTION(HEAT TRANSFER)
- DISTRIBUTION
- HUMIDITY
- EQUATIONS OF MOTION
- PATTERN RECOGNITION
- THERMODYNAMICS
- ENERGY
- BOUNDARY VALUE PROBLEMS
- MATHEMATICAL PREDICTION
- EVAPORATION
- HEAT FLUX
- SURFACE TEMPERATURE
- DIFFERENCE EQUATIONS

# Subject Categories:

- Meteorology
- Statistics and Probability