| 2010年冬季江西两次暴雨过程的环境场分析 |
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| 引用本文： | 朱星球,王咏青.2010年冬季江西两次暴雨过程的环境场分析[J].气象与减灾研究,2012(4):30-36. |
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| 作者姓名： | 朱星球 王咏青 |
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| 作者单位： | [1]南京信息工程大学大气科学学院,江苏南京210044 [2]江西省气象台,江西南昌330046 |
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| 基金项目： | 江西省气象局重点项目“江西省气象灾害评估系统研究” |
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| 摘 要： | 利用自动气象站逐小时雨量资料、常规气象观测资料以及NCEP每6 h一次的1°×l°全球再分析资料,分析了2010年12月12日和15日江西2次大范围暴雨过程。结果表明,在＂拉尼娜＂的气候背景下,高空急流右后侧的强辐散区与中低层异常加强的西南气流辐合区耦合,形成冬季暴雨过程。在动力、水汽条件方面,冬季暴雨700 hPa高度层比850 hPa高度层表现明显,暴雨落区与700 hPa高度层的水汽辐合区一致。与江西汛期暴雨过程相比,涡度、散度、垂直速度量值较小,动力条件较弱,造成逐小时降雨强度不大;850 hPa高度层的比湿值仅为汛期值的50%,低层水汽条件差,但整层水汽输送与汛期暴雨相近;对流不稳定、对称不稳定为冬季强降雨、强降雪存储了不稳定能量。
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| 关 键 词： | 冬季 暴雨 环境场 分析 |
ANALYSIS OF ENVIRONMENT FIELDS OF HEAVY RAIN EVENTS IN JIANGXI PROVINCE IN WINTER |
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| Zhu Xingqiu,Wang Yongqing.ANALYSIS OF ENVIRONMENT FIELDS OF HEAVY RAIN EVENTS IN JIANGXI PROVINCE IN WINTER[J].Meteorology and Disaster Reduction Research,2012(4):30-36. |
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| Authors: | Zhu Xingqiu Wang Yongqing |
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| Institution: | 1.Nanjing University of information Science ＆ Technology,Nanjing 210044,China 2.Jiangxi Provincial Meteorological Observatory,Nanchang 330046,China |
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| Abstract: | Based on conventional observation data,automatic station data and NCEP 1°×1°reanalyzed data,heavy rain events on 12 December,2010（called event 1） and 15 December,2010（called event 2） are analyzed.Results show that under the climatic background of La Nia,the convergence area of strong low-level southwest jet coupling with the abnormal strong divergence area of high-level jet flow forms the winter storm.The heavy rain area corresponds more with the 700 hPa moisture convergence area than that of 850 hPa.Compared with heavy rain events in flood season,the winter ones present smaller divergence,vorticity and vertical velocity.Although the specific humidity at 850 hPa is about 50% of that in flood season,the whole layer moisture transports in both season are similar.Convective instability,symmetric instability provide the unstable energy for winter heavy rain and snow. |
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| Keywords: | Winter Heavy rain Environment fields Analysis |
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