卫星水汽图像和位势涡度场在一次变性台风暴雨过程中的解译应用

doi:10.3969/j.issn.1673-503X.2018.03.001

Abstract

Abstract: Using the water vapor imagery,conventional meteorological observations and ERA-Interim reanalysis data,a torrential rain event related to typhoon and the cold air in Shandong Peninsula was studied by analyzing the water vapor imagery and dynamical fields.Results reveal that as the typhoon moving northward,the cold air of the westerly trough intrudes the typhoon circulation,the vortex cloud system combines with the baroclinic leaf-shaped cloud,and it results in a frontogenesis at lower level.The water vapor imagery shows that the asymmetric structure of typhoon is characterized by a moist ascent in the north and dry intrusion in the south of the vortex system.The dark areas with high potential vorticity in the water vapor imagery indicate the active dynamic dry bands.The axis of maximum winds is near the poleward side of the leaf boundary and along the moist side.The strengthening of the upper-level jet is associated with the sharpening of the dark/light boundary.The heavy rain area lies in rear of the jet on the right and moist ascent area ahead of the dynamic dry band.During the heavy rain process,the disturbance of upper-level PV (Positive Vorticity) caused by the dynamic dry bands results in the stretching downward of cyclonic vorticity.The column of cyclonic vorticity associated with the dynamic dry band couples with the positive vorticity column of typhoon and forms a vortex system over the area of torrential rain.The combination of ascending motion ahead of the PV anomaly and ascending motion of the typhoon circulation could have been a favorable factor to the strengthening of the moist ascending motion in the troposphere.The water vapor imagery reflects the synoptic scale forcing in the upper-level and indicates the development of important dynamical processes.A joint interpretation of water vapor imagery and upper-level potential vorticity fields can potentially provide dynamical insight into the imagery interpretation,thus provide valuable information for operational monitoring of neutercane-related torrential rain.

Key words: Water vapor imagery, Potential vorticity, Upper-level jet, Typhoon, Torrential rain, Interpreting

CLC Number:

P458.1⁺24

WU Zhi-yan, LI Hong-jiang, ZHAO Hai-jun, CONG Chun-hua, YAO Li-na. Application of satellite water vapor imagery and potential vorticity analysis on a neutercane-related torrential rain[J]. Journal of Meteorology and Environment, 2018, 34(3): 1-8.

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Application of satellite water vapor imagery and potential vorticity analysis on a neutercane-related torrential rain

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