外强迫因子对宁夏初霜冻日期的影响及其预测

黄莹, 杨建玲, 孙银川, 王璠, 王素艳, 王岱

Influence of external forcing factors on first frost date and its predition in Ningxia

HUANG Ying, YANG Jianling, SUN Yinchuan, WANG Fan, WANG Suyan, WANG Dai

图2 1981—2019年7—9月NINO3.4指数(a、b)、热带南大西洋指数(c、d)与9月200 hPa(a、c)、10月500 hPa(b、d)位势高度场的相关系数分布 (黑点区域通过α=0.1的显著性检验)

Fig.2 Distribution of correlation coefficients between NINO3.4 index (a, b), tropical south Atlantic index (c, d) from July to September and geopotential height on 200 hPa in September (a, c), 500 hPa in October (b, d) during 1981-2019 (The black dots area passed the significance test at 0.1)