JANUARY AND JULY GLOBAL SEA-LEVEL PRESSURE SIMULATIONS WITH THE TWO-LAYER PRIMITIVE EQUATION MODEL

We use the low resolution two-layer primitive equation model to simulate the January and July global sea-level pressure fields. The main heating term is the vertical transfer of sensible heat from the earth's surface Lilly's conservative space difference scheme and Matsuno's time difference scheme are used in the model. The initial value of the sea-level pressure is given by constant everywhere, and the initial values of wind velocity and temperature are given by their zonal mean climatic values. 1n the numerical simulations the actual January and July climatic earth surface temperature are used. The computed sea-level pressure fields of winter hemisphere display good agreement with the observed ones, but the computed sea-level pressure fields of summer hemisphere are not so good as those of winter hemisphere. The obtained sea-level pressure fields of our simple model are as good as those computed by using the high resolution general circulation models with the complex physical processes.