Yu lin eda chang
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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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Yu lin eda chang

Characteristic of Philippines–Taiwan Oscillation, and its contrast to Pacific climate Indices

2012 /07/26

Introduction

Yu-Lin Eda Chang


Yu lin eda chang

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


Yu lin eda chang

Typhoon Information

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


Yu lin eda chang

ECMWF

Interim PTO

(0.5X0.5 degree)

(1979~2012)


Yu lin eda chang

North & South poles are separated by 18N

180E is selected as eastern boundary


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North: 20% less

South: 65% more

Wind curl affected the cyclone genesis


Yu lin eda chang

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??


Yu lin eda chang

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!!!!


Yu lin eda chang

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


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


Yu lin eda chang

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


Yu lin eda chang

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


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Slow moving


Yu lin eda chang

Slow to moderate moving


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