Philippines-Taiwan Oscillation Y.-L. Eda Chang 1,2 and L.-Y. Oey 1 2010/11/16 1.Princeton University 2.National Taiwan Normal University Outline: Tide.

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Presentation transcript:

Philippines-Taiwan Oscillation Y.-L. Eda Chang 1,2 and L.-Y. Oey /11/16 1.Princeton University 2.National Taiwan Normal University Outline: Tide Gauge NE of Taiwan Comparison w/OFES PTO – Ocean Responses

IndicesTG PDO 0.47/11 -WP 0.33/23 Nino /13 *All exceed 95% significant level “TG” (=  ik ) = SL Ish -SL Kee (m) -3.5Sv +3.5Sv (m)

TG correlates with eddy zone: Corr(TG,SSHA) ~ 0.58/5mo + SSHA-> TG increases - SSHA-> TG decreases SSHA is due to eddies. Corr(SSHA,EKE) ~ 0.68/0 Kuroshio transport increases: Eddy-rich years More warm eddies eddy zone

Does OFES give similar responses? No correlation between OFES & Obs TG: (a). its eddy activity is different from AVISO; (b). obs. TG is not directly wind-driven. OFES AVISO OFES: Resolution: 0.1 deg Forcing: NCEP Data: monthly mean Corr(OFES,TG) = 0.03

OFES OFES TG (a)correlates well with its own eddy zone: warm eddies  increased transport etc; but… (b)SSHA & EKE do NOT correlate (-0.07); (a)&(b)  Something else other than eddies – Rossby waves? Also, suggests different responses w/SSHA in SCS and PS (than those shown in AVISO). AVISO

OFES ?

How are SCS/PS driven? How do SCS/PS relate to TG and eddy zone? ~S. Center of the WP index. ~Ym and/or ENSO index. Corr. ECMWF Wind stress curl 360d low-pass, 5degx5geg, 1980~2008  Note the negative correlation in SCS, which is inconsistent with Corr(TG,SSHA) < 0 found earlier. Therefore: SCS can’t be curl-driven

Luzon Island Taiwan + − Luzon Island Taiwan + − Positive phase Negative phase

+ phase Index TransportEddy Zone Ym # TGLZ strait*STaiwan*ELuzon*SSHA*EKEA* PTO 0.5/8 (0.78/10)* 0.74/60.63/70.56/30.58/130.76/90.72/3 *AVISO:1993~2008 TG:1980~2008; #: Courtesy of Dr. Qiu (Qiu&Chen, JPO 2010) STCC eddies+Ym give rise to stronger intrusion into SCS RG & OFES SCS is windcurl-driven

+ phase-Phase

Wang et al E140E160E180E EQ 10N 20N El nino warm cool

Summary + phase of WSC Index − phase of WSC Index ~Thank you~

02~08 98~08 95~08

New Index: S-N only for |corr| >0.2

Is corr. Between TG and WSC good enough to be the reference of index? Corr. LZ Strait transport & WSCCorr. TG & WSC

Correlation Table Indices TransportEddy Zone Ym # TGLZ strait*Staiwan*Eluzon*SSHA*EKEA* PTO 0.5/8 (0.78/10)* 0.61/80.63/70.56/30.5/80.75/60.62/3 Eddy Zone SSHA* 0.58/ /0- PDO 0.47/ /130.41/0- -WP 0.33/ Nino /130.83/ /160.44/160.8/0 Ym 0.31/100.78/ *:1993~2008 TG:1980~2008 # Qiu and Chen, 2010b, JPO

Correlation Table Indices TransportEddy Zone Ym # TGLZ strait*Staiwan*Eluzon*SSHA*EKEA* PTO2 0.57/110.74/60.52/90.63/190.58/130.76/90.73/3 Eddy Zone SSHA* 0.64/50.53/ /30.51/ /30.42/-13 PDO 0.47/110.64/-20.66/120.59/90.49/120.43/80.56/-3 -WP 0.31/230.59/200.35/170.44/160.34/340.53/100.44/20 Nino /130.83/10.59/170.36/410.59/150.49/160.8/0 EMI 0.44/170.59/60.63/230.64/240.51/190.76/180.6/5 Ym 0.31/100.78/00.72/120.46/160.43/130.54/10- *:1993~2008 TG:1980~2008 # Qiu and Chen, 2010b, JPO

Correlation Table Indices TransportEddy Zone Ym # TGLZ strait*Staiwan*Eluzon*SSHA*EKEA* PTO_new 0.58/10 0.5/8 (0.78/10)* 0.64/6 0.61/8 0.63/70.56/3 0.56/14 0.5/8 0.75/8 0.79/6(?) 0.67/2 0.61/3 Eddy Zone SSHA* 0.58/ /0- PDO 0.47/ /130.41/0- -WP 0.33/ Nino /130.83/ /160.44/160.8/0 Ym 0.31/100.78/ *:1993~2008 TG:1980~2008 # Qiu and Chen, 2010b, JPO

SCS SSHA ≠ SCS WSC Ym & Luzon Strait Intrusion ->ENSO (~0.8) Reduced gravity model driven by CCMP3 wind No eddy zone Similar changes of Luzon intrusion but weaker SCS SSHA follows WSC

TG with all variables From top to bottom: Index PDO -WP Nino3.4 EMI Ym Eddy zone SSHA

Luzon Strait transp (left) & Ym (right) with all variables From top to bottom: Index PDO -WP Nino3.4 EMI Ym SSHA

SSHA (left) & EKEA (right) with all variables From top to bottom: Index PDO -WP Nino3.4 EMI Ym SSHA

Eastern Luzon (left) & Southern Taiwan (right) with all variables From top to bottom: Index PDO -WP Nino3.4 EMI Ym SSHA

Corr. Between AVISO SSHA & TG for exceeding 95% significant level

Eddy Zone SSHA Eddy Zone EKEA

Index S Index N Index

Ym Nino3.4 PDO -WP