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Trajectory Analyses for the Kunming Measurements

Trajectory Analyses for the Kunming Measurements. Qiujun Fan 范秋君 , IAP (with J ianchun Bian ) Leigh Munchak , NCAR (with Laura Pan) Kenneth Bowman Texas A&M University. Large-Scale Conditions of the Kunming Campaign (Aug 2009). Objectives of This Study.

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Trajectory Analyses for the Kunming Measurements

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  1. Trajectory Analyses for the Kunming Measurements QiujunFan 范秋君, IAP (with JianchunBian) Leigh Munchak, NCAR (with Laura Pan) Kenneth Bowman Texas A&M University

  2. Large-Scale Conditions of the Kunming Campaign (Aug 2009)

  3. Objectives of This Study • Identify origins and transport pathways of the air mass that contributes to the KunMing Measurements • Inside vs. outside the anticyclone • Convective influence in the UT – tropics vs. Tibetan plateau • Performance of the trajectory model in this type of study - How well the convective influence is represented in the analyses winds

  4. Model and Analyses • Trajectory Model used: TRAJ3D (Bowman, 1993) • Kinematic using 3D winds • Meteorological Analyses used: NCEP GFS/FNL • 1x1 degree Lat/Lon, 26 pressure levels 1000 - 1 hPa, 6 hourly • Limitations • No vertical velocity field above the 100 hPa level in the data

  5. Case1 Deep Conv. in Typhoon @ Large-Scale Transp. • Low O3 & H2O at 100 mb • Strong shear below and above • Positive correlation between O3 and RHi

  6. Case 1

  7. Case 2 Extra-Tropical Stratospheric Intrusion Case 0807 • Thick dry and high-O3 layer in mid-troposphere

  8. Case 2

  9. Case 3 Super-Saturation with Multiple or Thick Layers

  10. Case 3

  11. Summary and Conclusions • Air mass contributes to the KunMing Measurements – from both inside and outside of the anticyclone • Convective influence in the UT – tropical storm/Typhoon had significant influence to the layer near the cold point • Performance of the trajectory model – consistent with key observational features of the soundings – more work will follow up

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