Koung Ying Liu* Tian Yow Shyu ** Chung Chih Liu***
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1 On the Vortex Dipole Triggered Heavy Precipitation during the Mei yu season of Taiwan Koung Ying Liu* Tian Yow Shyu ** Chung Chih Liu*** * College of Science, Chinese Cultural University, Taipei Taiwan R.O.C. ** Department of Geography, Chinese Culture University, Taipei TaiwanR.O.C. ***Minghsin University of Science and Technology, Hsin Chu County, Taiwan R.O.C.
2 Major Content 1.What is Dipole? 2.Electric Dipole. 3.Vortex Dipole (And Related Weather System). 4.Vortex Dipole and north wind. 5.The trigger mechanism of heavy precipitation during the Mei yu season of Taiwan.
3 Electric Dipole High Pressure low Pressure Is any weather system like the electric dipole system?
4 Rainy Pattern of surface mean during Mei Yu Season associated with the vorticity dipole and north wind Vortex Dipole Cold High Pressure Warm Low Pressure Southwest Flow North Flow
5 The concept The ageostrphic wind is largely responsible for the occurrence of subsynoptic changes in weather. Among the ageostrophic components latitude effect, the confluence and diffluence effect are considered reasons of northerly jet. The thermal wind and secondary circulation within the same area is toward the north therefore the jet decreases with height, i.e., it forms a wedge with down slope southward.
6 Conceptual Model Thermal Direct Circulation -f K Secondary Circulation V>0 Downward motion dv/dt=-f K Ageostropic wind accelerate the low level wind between the dipole and cause northly jet V<0 Upward motion
7 Conceptual Model Cold Wedge Southwest flow North flow When the north flow encounter with the moist southwest flow then the moist air could be shoveled upward motion and create heavy rainfall.
8 Vortex Dipole And Northly Flow Heavy rainfall case (And then 1987 TAMEX) The vortex dipole of 850 hpa wind field and relative humidity at 0200 LST 28 May 1981(from Liu, Hsiao, and Chang 2009).
9 THE SATELLITE IMAGERY AT 0700 LST MAY Convective cloud systems generated along the front, but not located at low center.
10 Surface map at 06UTC 07 may A weak front passed through Taiwan also caused local area heavy rainfall
11 The satellite imagery from 11UTC 07 May to 16UTC 07 May (a) 11UTC 07 May (b) 12UTC 07 May (c) 13UTC 07 May (d) 14UTC 07 May (e) 15UTC 07 May (f) 16UTC 07 May Convective cloud systems generated along the cloud front associated with north wind, and the convective cloud moved eastward.
12 Weather element variation in May The local rainfall amount near 50mm in a few hours
13 00 UTC May (1) Wind field of 850 hpa (2) Vertical motion of 700hpa The north flow moved from the north part of Mainland China
14 06 UTC May (1) Wind field of 850 hpa (2) Vertical motion of 700hpa The north flow moved eastward
15 12 UTC May (1) Wind field of 850 hpa (2) Vertical motion of 700hpa As the north flow near Taiwan area cause the southwest flow very strong vertical motion
16 Cloud Cold Wedge Southwest flow North flow When the north flow encounter with the moist southwest flow then the moist air could be shoveled upward motion and create heavy rainfall.
17 Conclusion 1. Vortex dipole is one of the feature that could advantage to the development of the local system. 2. The characteristic of north wind between the Vortex dipole may be one of the reasons that create heavy precipitation. 3. Because the North wind between the Vortex dipole encounter with the Southwest flow, and then force the moist flow climb up the slop of north wind. 4. And trigger the heavy rainfall.
18 Thank You for Your Attention!!!
19 dv/dt= Φ k Vf=-f K
20 T P P T P T T T+ T P T
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