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04/01/2012 1 ITF Gateway Program Dongchull Jeon KORDI POGO-13 Honolulu, Jan. 9-11, 2012 Western tropical Pacific ITF portals N.Pacific Topographic sill depths are shown in bold black numbers Schematic of ITF paths within the Indonesian seas shown by black dashed arrows Luzon Strait Karimata Strait Sibutu Passage ITF GATEWAY Program, 20132015 Objective: to monitor the contribution to the ITF of Mindanao/Halmahera and Luzon Strait; how does leakage into ITF depend on Mindanao Current transport? Instrumentation ~along the thick Black Lines: Mindanao/Halmahera; Luzon Strait. HYCOM shows net throughflow at Luzon and Mindanao/Halmahera transports vary outofphase with ENSO. Related: Makassar NOAA funded mooring NOAA Makassar Mooring

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04/01/2012

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ITF Gateway Program

Dongchull JeonKORDI

POGO-13Honolulu, Jan. 9-11, 2012

Western tropical Pacific ITF portals

N.Pacific

S.Pacific

~zero

Topographic sill depths are shown in bold black numbersSchematic of ITF paths within the Indonesian seas shown by black dashed arrows

Luzon Strait

Karimata Strait

Sibutu Passage

ITF GATEWAY Program,  2013‐2015

Objective: to monitor the contribution to the ITF of Mindanao/Halmahera and Luzon Strait; how does 

leakage into ITF depend on Mindanao Current 

transport?

Instrumentation ~along the thick Black Lines: Mindanao/Halmahera; Luzon Strait.

HYCOM shows net throughflow at Luzon and Mindanao/Halmahera transports vary out‐of‐phase with ENSO.

Related: Makassar NOAA funded mooring

NOAA Makassar Mooring

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Luzon Strait

Mindanao/Halmahera

Makassar Strait

?

The imbalance of the westward flow [Mindanao-xx] and eastward flow [xx-Halmahera] marks the feed of tropical Pacific Water into Makassar Strait and Maluku Sea.

A

BC

A= B + C1986-1999 gray

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X PIES [approx bottom depth shown]X CPIES [approx bottom depth shown]M Current mooring: 2 LR ADCP, upward and downward set 500 m;  current meters, 1500, near sea floor; microcat at sea floor; [approx bottom depth shown]

On deployment:  CTD/LADCP [yo‐yo, tidal cycle] section. Repeat as often as possible in rotation and recovery cruises.

Ships:  BJ8?, KORDI? US? China? 

2 year deployment, 1 year rotation of all moorings [which upon study enables planning for a possible longer range plan, beyond the second year.

Luzon Strait by China [SIO: Zhu, Chen]?  

x

x

x

x

x

x

~1000 m

M

M

M

M~3000 m m

~1000 m

~1000 m

~1000 m

~2500 m

~3500 m

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TIME TABLE:

• Fall/winter 2011/12:  interact with collaborators: US, Korea, China, Indonesia] to build a preliminary program design; who does what?

• Present Preliminary Plan at the CLIVAR ITF TT meeting in Indonesia, week of 12 March 2012

• US component: NSF proposal Aug2012 [Thurnherr, Gordon, Watts]

• field work late 2013 to late 2015.

WEAKNESS: monitoring of Halmahera Eddy flow into Halmahera SeasHowever: ITF mainly North Pacific origin; Maybe at ITF TT meeting coverage of the 

Halmahera Seas will emerge?

Drifter Tacks (Apr 1986 ‐ Sep 2010)

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ITF Gateway Program

• Phase I• Period : 2013-2015• Participants:

A. Gordon (LDEO, USA) : 2 ADCPD. Jeon (KORDI, Korea) : 2 ADCPR. Watts (URI, USA) : 4 PIES + 2 CPIESR. Djamaludin (BPPT, Indonesia) : r/v BJ 8D. Chen (SIO/SOA, China) : 5~15 PIES