專題討論
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專題討論. (Seminar). 授課老師 : 游政谷. Seminar(3). Seeder-feeder mechanism 種雲播雲機制. 高雲 (seeder cloud). 低雲 (feeder cloud). 2. Upslope condensation ( 上坡風凝結機制 ). Low-level PPI of radar reflectivity. Orographic Rainband(OR) --- Quasi-stationary --- Orientation closely linked to the terrain feature

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專題討論

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專題討論

(Seminar)

授課老師: 游政谷

Seminar(3)


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  • Seeder-feeder mechanism

  • 種雲播雲機制

高雲(seeder cloud)

低雲 (feeder cloud)


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2. Upslope condensation

(上坡風凝結機制)


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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


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3. Upslope triggering

(上坡風激發機制)


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4.25 km Dual-Doppler Analysis 0720 UTC

SCT

UT

NCFR


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UT

UT

NCFR


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4. Upstream triggering

(上游減速激發機制)


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


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Contours of cross-barrier flow component


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5. Thermal triggering

(熱力激發機制)


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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)


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6. Lee-side triggering

(背風面激發機制)


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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)


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7. Lee-side enhancement by gravity waves

(透過重力波在背風面的加強機制)


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