巴伦支海海冰异常对初夏大气环流和东亚天气影响的数值研究

本文利用在ＮＣＡＲ气候模式ＣＣＭ１（Ｒ１５Ｌ１２）基础上改变为用于长期数值预报的ＣＣＭ１（Ｒ１５Ｌ７），以１９９１年５月２日１２时（ＧＭＴ）国家气象中心客观分析资料为初始场，分别以巴伦支海附近海域不同的海冰边界作为下垫面极冰条件，进行了相应相应的月长期数值预报试验。以研究该海区海冰对大气环流特别是东亚天气的影响。试验〈Ａ〉以接近于９１年５月平均冰边界作为极冰边界条件，试验〈Ｂ〉和试验〈Ｃ〉分别对应

NUMERICAL STUDY ON THE INFLUENCE OF THE ANOMALYOF SEA ICE IN BARENTS SEA ON THE GENERALCIRCULATION AND THE WEATHER IN EASTASIA DURING THE EARLY SUMMER

To investigate the influence of various sea ice boundaries in Barents Sea on the general circulation and the weather in east Asia during the early summer, three experiments for themonthly numerical weather prediction were performed by emloying the CCMI (R15L7) Modelwhich was formed from NCAR' S CCM1 (R15L12) Model by making some changes for beingmore Suitable to the long-range numerical weather prediction, and the objective analysis data of2 May 1991 were used as initial field. Three runs are corresponding to three different ice boundaries in Barents Sea which are as follows: (1) an approximate monthly mean ice boundary ofMay in 1991, (2) the maximum extent of ice, (3) the minimum extent of ice.The resuts of experiments show that the anomaly of ice boundary in the Barents Sea affectsthe intensity of the acitivities of the cold air which moves through the channel between theI-ake Bajkal and the Lake Balkhash. When the ice boundary is at its minimum extent in BarentsSea, the activities of the cold air weaken and accompany with a northward withdraw and theinterface of the cold air and the warm-damp flow will occur over the basin of the Yellow Riveror more northward of it. On the contrary, when the ice boundary extends to its maximum extent, the intensity of the activities of the cold air strengthens and its influence reaches to thesouth of china.