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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

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

2012 /07/26

Introduction

Yu-Lin Eda Chang

slide2

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
slide3

Typhoon Information

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

slide4

ECMWF

Interim PTO

(0.5X0.5 degree)

(1979~2012)

slide5

North & South poles are separated by 18N

180E is selected as eastern boundary

slide6

North: 20% less

South: 65% more

Wind curl affected the cyclone genesis

slide8

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??

slide9

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!!!!

slide10

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

slide13

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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