冬季对流层下半部温度场的遥相关及与下垫面加热异常的关系

RELATIONSHIP BETWEEN THE TELECORRELATION OF THE TEMPERATURE FIELDS IN THE WINTER LOWER TROPOSPHERE AND THE HEATING ANOMALY OVER THE UNDERLYING SURFACE

本文利用1000—500hPa厚度资料分析研究了北半球中高纬地区对流层下半部冬季气温异常的水平结构及与下垫面加热异常的关系。研究表明,欧亚大陆腹地气温异常的强度和水平范围最大,该区域异常暖时,欧洲西北部和亚洲东部沿海异常冷,低纬太平洋中部、北美西岸和大西洋中部异常暖,反之亦然。20-110°W北极区海冰范围是影响这种分布形势的可能因素之一。

Using the 1000-500 hPa thickness data, investigation is made of the rela-tionship between the horizontal structure of the winter temperature anomaly in the low-er troposphere over the NH extratropics and the heating anomaly of the underlying sur-face. It is shown that the most intensive and widespread temperature anomaly occurs inthe Eurasian inland. When it is abnormally warm in this area, the northwestern part ofEurope and the east coast of Asia will experience extreme cold, and the lower latitudesin the central Pacific, the west coast of North America and the mid-Atlantic will be ex-tremely warm, and vice versa. It may be inferred that the coverage of the polar sea icein the area of 20-110°W has much to do with the above temperature distribution.