为了研究远距离台风降水的水汽特征,利用NCEP/NCAR(1°×1°)再分析资料和常规高空、地面观测资料等对2015年第15号台风"天鹅"(Goni)的水汽分布特征和变化特征进行了分析,该台风在北上过程中对中国长三角中部地...为了研究远距离台风降水的水汽特征,利用NCEP/NCAR(1°×1°)再分析资料和常规高空、地面观测资料等对2015年第15号台风"天鹅"(Goni)的水汽分布特征和变化特征进行了分析,该台风在北上过程中对中国长三角中部地区的降水产生影响,是一次典型的远距离台风降水。分析结果表明:(1)本次降水是在高空急流轴入口右侧的槽前发生的,台风东侧强的气流将水汽输送至500 h Pa高空槽前,暖湿气流与槽后南下的干冷空气相遇形成降水。(2)暴雨主要由短时强降水构成,强降水时段最大降水中心位于5840 gpm等高线上。(3)整层水汽含量峰值出现在强降水时段之前,台风中心强度的变化影响着降水区整层水汽含量的变化,且中心气压越低,可降水量值越高,暴雨区降水强度越大。(4)强降水之前湿层较厚,比湿和辐合增强,水汽通量散度负值中心与上升运动中心基本吻合,有利于水汽的辐合上升,对降水的维持和增幅都起到了积极的影响。展开更多
Using T106 numerical products, MM5 simulations in conjunction of Q-vector scheme-computed NCEP results, observations and satellite cloud images, study is undertaken for an exceptionally intense rainstorm event afflict...Using T106 numerical products, MM5 simulations in conjunction of Q-vector scheme-computed NCEP results, observations and satellite cloud images, study is undertaken for an exceptionally intense rainstorm event afflicting the Wenzhou region of Zhejiang province far away from the tropical storm center happening early on the morning of September 4, 1999 （TS9909 hereinafter）. Evidence suggests that, like previously-studied typhoons landing in autumn south of Xiamen to the eastern part of Guangdong, TS9909 has an inverted trough in the central south of the coastal belt of Zhejiang province that produces the rainstorm from the meso convective complex （MCC） on the warm, moist shear inside; the time and order of the magnitude of the rainfall are bound up with the development of the pattern of strong Q-vector divergence gradients during the event for the study area; the NE - SW coastline and the unique topography of the Yandang mountains inside the region are favorable for air lifting are the major contributors to the torrential rains.展开更多
文摘为了研究远距离台风降水的水汽特征,利用NCEP/NCAR(1°×1°)再分析资料和常规高空、地面观测资料等对2015年第15号台风"天鹅"(Goni)的水汽分布特征和变化特征进行了分析,该台风在北上过程中对中国长三角中部地区的降水产生影响,是一次典型的远距离台风降水。分析结果表明:(1)本次降水是在高空急流轴入口右侧的槽前发生的,台风东侧强的气流将水汽输送至500 h Pa高空槽前,暖湿气流与槽后南下的干冷空气相遇形成降水。(2)暴雨主要由短时强降水构成,强降水时段最大降水中心位于5840 gpm等高线上。(3)整层水汽含量峰值出现在强降水时段之前,台风中心强度的变化影响着降水区整层水汽含量的变化,且中心气压越低,可降水量值越高,暴雨区降水强度越大。(4)强降水之前湿层较厚,比湿和辐合增强,水汽通量散度负值中心与上升运动中心基本吻合,有利于水汽的辐合上升,对降水的维持和增幅都起到了积极的影响。
基金sponsored jointly by the Natural Science Foundation of China (Grant 4040950009402050084)the Project of Planned National Key Basic Research/Development (2004CB418301)
文摘Using T106 numerical products, MM5 simulations in conjunction of Q-vector scheme-computed NCEP results, observations and satellite cloud images, study is undertaken for an exceptionally intense rainstorm event afflicting the Wenzhou region of Zhejiang province far away from the tropical storm center happening early on the morning of September 4, 1999 （TS9909 hereinafter）. Evidence suggests that, like previously-studied typhoons landing in autumn south of Xiamen to the eastern part of Guangdong, TS9909 has an inverted trough in the central south of the coastal belt of Zhejiang province that produces the rainstorm from the meso convective complex （MCC） on the warm, moist shear inside; the time and order of the magnitude of the rainfall are bound up with the development of the pattern of strong Q-vector divergence gradients during the event for the study area; the NE - SW coastline and the unique topography of the Yandang mountains inside the region are favorable for air lifting are the major contributors to the torrential rains.
