Evolution Characteristics of Moist Potential Vorticity in the Rainstorm Caused by "Morakot" Typhoon
Evolution Characteristics of Moist Potential Vorticity in the Rainstorm Caused by "Morakot" Typhoon
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“莫拉克”台风暴雨中湿位涡演化特征
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Huang Xin
中科院分区：
文献类型：
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作者：
Huang Xin
利用NCEP/NCAR 1°×1°再分析资料，对2009年第8号台风“莫拉克”引发浙江沿海暴雨的湿位涡和拟相当位温进行了计算，重点分析了湿位涡1和湿位涡2的正负变化特征。判断大气对流的不稳定位置、陡坡密集段，MPV 1和MPV 2的负值中心与暴雨中心有很好的对应关系，MPV 1的负值越小，MPV 2的负值中心与暴雨中心的对应关系越好（如MPV 1的绝对值越大）降水越强，MPV 1负值区的分布变化与台风移动路径的变化一致，MPV 2负值区出现时大气斜压性增强，同时，负值区影响范围和高度的变化与降水量的增加有关，当降水区完全被负MPV 2区覆盖时，该地区的降水将结束。
Based on the NCEP/NCAR 1°×1° reanalysis data,the calculation was made on moist potential vorticity and Pseudo-equivalent potential temperature of the heavy rain triggered by the 8th typhoon "Morakot" in the coastal areas of Zhejiang Province in 2009.The analysis was emphasized on variation characteristics of positive values and negative values of MPV1 and MPV2.As a result,it is the criterion to forecast severe precipitation by judging the instable place of atmospheric convective,dense section of abrupt slope,stronger section of energy front considering ascending motion.The center of negative MPV1 and MPV2 has a very good correspondence with the centre of rainstorm.The smaller the negative value of MPV1(e.g.the bigger the absolute value of MPV1) is,the heavier the precipitation is,and the distribution variation of negative value region of MPV1 is consistent with the variation of moving path of typhoon.Atmospheric baroclinity increases when negative MPV2 region arised,and it is benefit for the increasing of precipitation.At the same time the change of influence scope and height of the negative value section is relative with the increase or decrease of precipitation.When precipitation area is covered completely by negative MPV2 region,the precipitation in this area will end.