太湖平原(浙江省北部)粮食作物产量波动的长期天气分析

本文根据1960—1979年粮食作物产量和气象资料,分析了太湖平原(浙江省北部)粮食生产丰欠的气候背景,提出了高产-少水(丰年)和低产-多水(欠年)两种关系型。对比分析了丰欠年两种类型的500毫巴环流形势,着重揭示了前半年极涡和副高的演变过程以及两者相互配置在丰年与欠年的显著差异;提出北美-格陵兰中高纬是环流演变的关键区。用该区的局部西风指数,可以表征丰大年环流特征的差异性。另外,还讨论了东亚季风活动期的早晚和季风盛衰支配丰大年的可能模式,以及海温异常与丰欠年的可能联系。指出,应进一步研究季风气候区影响粮食作物的大气环流特征及其变化规律。

LONG-RANGE WEATHER ANALYSES OF THE CHANGE OF FOOD YIELD OVER TAI HU PLAIN

In this paper, the climatic background of high or low yield in the food production over Tai Hu Plain is analysed on the basis of yield and meteorological data in the period 1960-1979. Both relational types of the high yield/less rainfall years and low yield/more rainfall years are indicated. Furthermore, the 500 mb circulation patterns of both relational types are analysed comparatively. The middle-high latitude area in North America-Greenland can be treated as a key area of circulation evolution. It is possible to show the difference of circulation patterns of high or low years using the west wind index of this area. Finally, the relationship between the food yield in the region and the yearly change of the monsoon over Easten Asia is discussed.