專題討論 (Seminar) 授課老師: 游政谷 Seminar(3).

Presentation on theme: "專題討論 (Seminar) 授課老師: 游政谷 Seminar(3)."— Presentation transcript:

1 專題討論 (Seminar) 授課老師: 游政谷 Seminar(3)

2 Seeder-feeder mechanism
種雲播雲機制 高雲(seeder cloud) 低雲 (feeder cloud)

3 2. Upslope condensation (上坡風凝結機制)

4

5

6 dBZ Low-level PPI of radar reflectivity Orographic Rainband(OR)
--- Quasi-stationary --- Orientation closely linked to the terrain feature Typhoon Rainband(TR) --- Fast movement --- Curved feature dBZ

7 3. Upslope triggering (上坡風激發機制)

8 4.25 km Dual-Doppler Analysis 0720 UTC
SCT UT NCFR

9 UT UT NCFR

10 4. Upstream triggering (上游減速激發機制)

11 鋒前西南氣流受地形阻礙影響轉成偏南風 (Yu and Smull 2000)

12 Contours of cross-barrier flow component

13 5. Thermal triggering (熱力激發機制)

14 中午時刻在山脊附近發展的積雲 (攝於宜蘭省道,雪山山脈南側)

15 6. Lee-side triggering (背風面激發機制)

16 在較小的Froude number環境下, 美國華盛頓州奧林匹克山背風面之輻合 (Mass 1981)

17 7. Lee-side enhancement by gravity waves
(透過重力波在背風面的加強機制)