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Orographically-forced coastal wind fields around Hokkaido, Japan   Osamu Isoguchi (RESTEC) ●Masanobu Shimada (JAXA/EORC)
Orographically-forced coastal wind phenomena revealed by SAR wind data Characteristic of ocean surface winds in the lee of an isolated island isoguchi et al. (2011),Characteristics of Ocean Surface Winds in the Lee of an Isolated Island observed by Synthetic Aperture Radar, Mon. Wea. Rev. 2.Coastal meteological phenomena forced by headlands
Characteristic of ocean surface winds in the lee of an isolated island Objective: Characteristic of ocean surface winds around an isolated island is examined using Synthetic Aperture Radar (SAR) and rawinsonde sounding observations.  ,[object Object],[object Object]
Statistical Characteristics of Atmospheric Island Wakes,[object Object]
In situ stations Motodomari  Kutsugata (a) Time series of potential temperature and wind vertical profiles at Wakkanai and  (b) wind speed and direction at In situ stations in Rishiri Island on May 19-24 PALSAR acquisition ,[object Object]
Low-level jet behind the island is connected to downslope winds,[object Object]
Statistical Characteristics of Atmospheric Island Wakes,[object Object]
No significant island wakes (17%)
Type B
Wind shadows in the lee of the island accompanying low-level jets on both sides of the shadow area (27%)
Type C
Low-level jets formed in the lee of the island , same as the case study on May 22 2009 (19%)
Type D
Wind shadows in the lee of the island without jets, different from Type B (36%),[object Object]
Inverse Froude number (Fr)Theoretical flow regimes on the non-dimensional mountain height ĥ < 1: small amplitude waves (quasi-linear and weakly nonlinear ranges) ĥ ~ 1: wave breaking -> a wave-induced stagnant layer -> onset of downslope winds ĥ > 1: upstream stagnation, flow splitting and lee vortices

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TU2.T10.3.pptx

  • 1. Orographically-forced coastal wind fields around Hokkaido, Japan Osamu Isoguchi (RESTEC) ●Masanobu Shimada (JAXA/EORC)
  • 2. Orographically-forced coastal wind phenomena revealed by SAR wind data Characteristic of ocean surface winds in the lee of an isolated island isoguchi et al. (2011),Characteristics of Ocean Surface Winds in the Lee of an Isolated Island observed by Synthetic Aperture Radar, Mon. Wea. Rev. 2.Coastal meteological phenomena forced by headlands
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 10. Wind shadows in the lee of the island accompanying low-level jets on both sides of the shadow area (27%)
  • 12. Low-level jets formed in the lee of the island , same as the case study on May 22 2009 (19%)
  • 14.
  • 15. Inverse Froude number (Fr)Theoretical flow regimes on the non-dimensional mountain height ĥ < 1: small amplitude waves (quasi-linear and weakly nonlinear ranges) ĥ ~ 1: wave breaking -> a wave-induced stagnant layer -> onset of downslope winds ĥ > 1: upstream stagnation, flow splitting and lee vortices
  • 16.
  • 17. Types B, C, and D : non-dimensional mountain height (ĥ ) dependence
  • 18. Type B: under the large ĥ (>2.0) flows
  • 19. Type D: under relatively small ĥ (< 1.75) flows
  • 20. Type C: in the transition range of types B and D (1.0 < ĥ < 2.5)Wake types and their ĥ -dependent transition are qualitatively consistent with the theoretical regimes
  • 21.
  • 22. Temperature & wind vertical profile from rawinsonde soundings @ Sapporo & Wakkanai Wakkanai Sapporo temperature Potential temperature Southeasterly stratified flows in the atmospheric boundary layer caped by westerlies in the above later. Mountain height ~100m => Non-dimensional mountain height ~1.9 Condition for wave breaking (downslope winds) regime
  • 23. at lower layer (~500m): southeasterly => gap winds at 500~1000m layer: south-southeasterly interacts with mountains in the headlands => onset of downslope winds Hypothesis: layer-dependent orographic forcing Headland heights~1000m
  • 24.
  • 25. More investigation is needed to clarify the mechanism of orographic forcing.