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大气科学  2013 

影响我国北方冬半年气旋的气候特征及年际变率

DOI: 10.3878/j.issn.1006-9895.2012.12055

Keywords: 北方气旋,自动识别与跟踪,气候特征,年际变率

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Abstract:

本文首先对气旋进行了客观定义,实现了气旋的自动识别与跟踪算法,利用NCEP/NCAR再分析资料建立了近60年(1951~2010)我国北方冬半年气旋活动数据集。对气旋的气候特征与年际变率进行了探讨。结果表明:蒙古国中西部、雅布洛诺夫山脉东麓等为主要气旋源地;蒙古国东南部、内蒙古东南部、松嫩平原是气旋活跃区;内蒙古东南部、东北地区中北部为气旋消亡区与快速填塞区;初春、仲秋季节气旋较活跃,冬季气旋最少;随季节推移,气旋活动区域向南、向东推进;气旋移动以偏东路径居多,其次是东南、东北路径;700hPa风场对气旋移动趋势具有较好的指示意义;24h标准加深率大于0.5Bergeron的快速发展气旋,位于内蒙古东部、东北地区中北部、日本海中部等地;爆发性气旋则主要位于日本海附近,我国大陆极少;极端最强气旋主要集中在1980年代以前的仲秋与初春;1980年代以来,气旋频次相对较少,强气旋有逐渐增加的趋势;气旋频次减少与东亚中高纬度大气低层斜压性减弱有关。

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