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Contents: Field experiment at Palau (PALAU-2005) Preliminary results of a rotating cloud system

A Dual-Doppler Radar Observation on Mesoscale Convective Systems Preceding the Genesis of a Tropical Depression over the Western North Pacific.

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Contents: Field experiment at Palau (PALAU-2005) Preliminary results of a rotating cloud system

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  1. A Dual-Doppler Radar Observationon Mesoscale Convective SystemsPreceding the Genesis of a Tropical Depressionover the Western North Pacific Hiroyuki Yamada1, Ken Gohara2,Qoosaku Moteki1, Tomoki Ushiyama1,Masaki Katsumata1, Geng, Biao1,Ryuichi Shirooka1, Hiroshi Uyeda1,21: JAMSTEC, 2: Nagoya University • Contents: • Field experiment at Palau (PALAU-2005) • Preliminary results of a rotating cloud system • Plan of PALAU-2008

  2. Environment of Generating Cyclone Palau How do MCSs play a role in cyclogenesis?

  3. PALAU-2005 (June-July) Pacific Area Long-term Atmospheric observation for Understanding climate change

  4. Heavy Rain in Western Japan Case Studied H TD Palau Precipitable Water, Vapor Flux and Geopotential Height at 925 hPa Tracking Chart of “Emong” (from http://www.typhoon2000.ph) • A weak tropical depression • Significant vapor transport to western Japan before the heavy rain episode in 8-10 July 2005

  5. Overall Evolution • Formation of a rotating cloud mass over Palau • Dissipation over the Philippines Sea • Redevelopment and TD generation near Philippines

  6. Overall Evolution • Westerly-propagated tropical wave

  7. Synoptic Environment • Westerly-propagated tropical wave • +  Cyclogenesis • Monsoon Trough

  8. Internal Structure • northerly (forward) + southerly (rear) • cyclonic flow in the MCS

  9. Internal Structure

  10. Sea Level Pressure (TD stage) (Cyclogenesis stage) No pressure decrease at the beginning of cyclogenesis

  11. Summary & Discussion • Preliminary results of a cloud system during PALAU-2005: • Preceding the evolution of a weak tropical depression • Environment witha large-scale cyclonic flow formed by • a westerly-propagating tropical wave and • low level shear along a monsoon trough • Mesoscale cyclonic flow within the cloud system • No pressure decrease in the cloud center • A rare observational evidence of tropical cyclogenesis over the north western Pacific ocean • Problems: • Why this system could not develop to a tropical storm? • How large are the condensation heating and the low-level vorticity enough to a typhoon genesis?

  12. PALAU-2008 Plan

  13. THANK YOU A freight train near NCAR (Nov 2, 2006)

  14. DIRECT TC-induced P-J pattern (Kawamura and Ogasawara 2006, SOLA) INDIRECT Background: Impacts of TC to East Asia

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