2020年7月黑龙江极端少雨成因初探
娄德君, 李永生, 王永光, 陈晨, 张健

Preliminary study on the causes of extremely less precipitation in Heilongjiang Province in July 2020
LOU Dejun, LI Yongsheng, WANG Yongguang, CHEN Chen, ZHANG Jian
图6 7月JPI负异常年合成的波作用通量(矢量,单位:m2·s-2)和500 hPa位势高度距平(等值线,单位:gpm)
(深、浅灰色区分别为通过α=0.01、0.05显著性检验的500 hPa位势高度距平)
Fig.6 Composite wave activity flux (vectors, Unit: m2·s-2) and 500 hPa geopotiential height anomaly(contours, Unit: gpm) in negative anomalous years of July JPI
(Dark and light grey areas indicate the 500 hPa geopotiential height anomaly passing the significance tests at 0.01 and 0.05 level, respectively)