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Yu-Lin Eda Chang

Characteristic of Philippines–Taiwan Oscillation, and its contrast to Pacific climate Indices. 2012 / 07/26 Introduction. Yu-Lin Eda Chang. Goal: . Typhoon activity: dipole structure of PTO, seek for the connection between the two

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Yu-Lin Eda Chang

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  1. Characteristic of Philippines–Taiwan Oscillation, and its contrast to Pacific climate Indices 2012 /07/26 Introduction Yu-Lin Eda Chang

  2. Goal: • Typhoon activity: dipole structure of PTO, seek for the connection between the two • Rainfall: PTO<0 rains more in Taiwan but less in Japan etc…. • STCC eddies (PTO is a more suitable index for the eddy activity) • Show contrast between different climate indices Data: • ECMWF interim wind product for PTO (1979~2012) • JTWC typhoon best track data • AVISO altimetry data • GPCC/GPCP precipitation data

  3. Typhoon Information Joint Typhoon Warning Center (JTWC), 1950~2012 (use 1979~2012 for this study)

  4. ECMWF Interim PTO (0.5X0.5 degree) (1979~2012)

  5. North & South poles are separated by 18N 180E is selected as eastern boundary

  6. North: 20% less South: 65% more Wind curl affected the cyclone genesis

  7. Ocean Conditions: SSHA strength of typhoon (*~2008 from Chang and Oey, 2012) Repeat this to 2012 later Does the strength of typhoon behave like a seesaw??

  8. First try: Group typhoon’s track by different category Also sort it by PTO Here only show the large PTO events (PTO>1 or PTO <-1) MESSY!!!!

  9. Sorting method: Create 1 x 1 degree grid, covering the western Pacific Ocean Sort the typhoon category when it hits the grid Each typhoon has different path & life cycle (just like drifter), so the longitude, latitude, time, moving speed are also recorded. The same grid may be hit by several times Mean category: take the mean of all hits Max category (Potential category): record the maximum category Both are further sepearated by positive & negative PTO

  10. limit=0, Mean Category (left), Max category (right)

  11. limit=0, Mean Category (left), Max category (right)

  12. The ocean condition is not necessarily lead to the strong typhoon. Fast moving typhoon may not have chance to get the energy from the ocean. Therefore, I further group the typhoon by the moving speed. Moving speed = distance/time takes

  13. Slow moving

  14. Slow to moderate moving

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