用初始方程二层模式模拟一月和七月全球海平面气压场

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

中文摘要:

      用低分辨率的初始方程二层模式在给定下垫面温度下模拟了一月及七月全球海平面气压场,其中加热项主要是感热垂直输送。计算采用守恒的Lilly空间差分格式及Matsuno的时间差分格式。海平面气压的初值给成常数值,高空的风速及气温的初值给成纬向平均的气侯值。在数值模拟中,下垫面温度用一月及七月的气候实际值。计算的冬半球海平面气压与观测值相当一致,而夏半球的结果稍差些。本模式所求得的全球海平面气压场能与实况相比,结果并不差于高分辨率的复杂模式。

英文摘要:

      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.