水汽输送对三江平原降雪资源的贡献

Contribution of Water Vapor Transport to Snow Resources in Sanjiang Plain

使用16个观测站逐时降雪资料和NCEP/CFSv2逐时分析资料研究了2015年12月1-3日水汽输送对三江平原降雪资源的贡献。结果表明:(1)三江平原降雪的水汽来源于九州帕劳海岭北部至日本海区域;(2)从水汽收支与降雪关系来看,三江平原的东边界、南边界水平水汽输送对降雪资源有正的贡献,特别是东边界水汽贡献更为重要,西边界、北边界贡献较弱;(3)降雪强度在1.0mm/h以上时,水平水汽通量达4g*s/kg以上,水汽垂直向上输为0.2g/(s*h Pa*cm)以上或水汽垂直向下输送达0.05g/(s*h Pa*cm)。

Based on the NCEP/CFSv2 data,water vapor transport characteristics is analyzed on the snow process in Sanjiang plain on December 1-3,2015.The result shows that Northern Kyushu Palau ridge and Japan Sea are the sources of the vapour of the snow.The contribution of water vapor amount to the snow are positive at the east boundary and the south boundary of the Sanjiang plain,and the contribution of water vapor amount to the snow are weak at the west boundary and the north boundary of the Sanjiang plain.Both strong horizontal water vapor transport with strong vertical upward water vapor transport and weak horizontal water vapor transport with vertical downward water vapor transport are corresponding to strong snowfall period.