Accession Number:

ADA160359

Title:

Experimental Runs with a Low-Order Model of a Moist General Circulation.

Descriptive Note:

Final rept. 24 Nov 82-31 Mar 85,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE CENTER FOR METEOROLOGY AND PHYSICAL OCEANOGRAPHY

Personal Author(s):

Report Date:

1985-05-31

Pagination or Media Count:

24.0

Abstract:

We have made some experimental runs with a very-low-order general-circulation model, which includes the thermodynamic and radiative effects of water vapor and liquid water in the atmosphere. We first made several runs lasting 20 years or longer, to determine suitable combinations of values of model parameters for use in subsequent experiments. Using one suitable combination, we made one 450-year run, and found that the globally averaged atmospheric temperature underwent long-period fluctuations with a range of about two degrees, resembling real atmospheric climatic changes. In some final runs we suppressed the influence of cloudiness on the global aldebo, and found that this modification eliminated the high sensitivity of the temperature to the plantary temperature and the very slow approach of the temperature to equilibrium, which characterized the ordinary runs. Keywords Atmospheric circulation Atmosphere models Albedo Cloud-feedback and Thermodynamic and radiative effects of water.

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE