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新疆北部一次持续暴雪天气过程分析

, PP. 282-287

Keywords: 暴雪天气,水汽通量,环流特征,物理量场,新疆

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Abstract:

利用常规气象观测资料和NCEP/NCAR逐日6h再分析资料,对2010年1月4~7日新疆北部持续暴雪过程的环流特征及物理量场进行诊断分析。结果表明北半球中高纬阻塞高压维持时间长、切断低压稳定提供了降雪"持续性"的环流背景。切断低压不断分裂短波并西退再东移是造成降雪的影响系统;降雪区大到暴量的强降雪时段,850hPa上维持10~16m/s的西北风与8~10m/s东南风的强辐合线,700hPa上为风速辐合区,500~200hPa逐渐转为风速的辐散区。形成对流层低层强辐合、中高层强辐散及整层强的上升运动;水汽输送主要为西南路径,也有一定量西北方的水汽来源。在55°N附近有一支自东向西再自北和西北向南再向东南的水汽输送带,这支水汽输送带上最大的水汽通量占西南方向水汽量的近1/4,多方水汽的输送是新疆北部出现历史罕见强暴雪的主要原因。

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