R/V Mirai CruisesVOS KATORI

VOS Delmas Blossebille

VOS MOL Wellington

ADCP Mooring

Wide Area XBT/XCTD

Harbour Bridge

OASIS Observations

TRITON Buoys

FORSGC/JAMSTEC Indian Ocean Activities

Subsurface ADCP Mooring System

Data interval: 1 hours

Ping interval: 6.66 sec

1 data = 27 pings average

Obs. range: 8m X 50 layers

Nov.2000

Oct.2001

Jul.2002

Jul.2003

Location: 0N, 90E

11 months 9 months 12 months

Zonal currents at 0N, 90E

2001 2002

20032002

Period 1 Period 2

Period 3

Power spectrum density of currents at 0N, 90E

Broad time-scale with strong 30-50 days

variability, shallower than 120 m depth

10-20 days variability above 100 m depth

Monthly mean zonal currents at 0N, 90E

Typical Wyrtki jet structure

The contour levels are chosen so that 75%, 50%, 25%, and 5% of the wavelet power is above each level, respectively.

Wavelet analysis for zonal currents at 0N, 90E

The contour levels are chosen so that 75%, 50%, 25%, and 5% of the wavelet power is above each level, respectively.

Wavelet analysis for meridional currents at 0N, 90E

1. Development of TRITON Array

2. Data from Indian Ocean TRITON

3. TRITON web page update plan

Yoshifumi KurodaJAMSTECJan 2004

Status of TRITON Array

Configuration of the TRITON

March, 1998 March, 1999 March, 2000

March, 2001 March, 2002 August, 2002

Development of TRITON buoy array from 1998 to 2002

Purposes; 1. Monitoring ENSO as TAO/TRITON array2. Air-sea interaction over the Pacific and Indian Ocean warm

pool 3. Variability of temperature and salinity in the warm pool - Improvement of the predictability of El Nino

　　　　 TRITON　 Salinity　1.5S90E

　　　 TRITON　 Temperature　1.5S90E

　　　 TRITON　 Temperature　5S95E

　　　　 TRITON　 Salinity　5S95E

Warm water accumulation associated with eastward jet in monsoon break period

High salinity water intrusion from Arabian Sea

2820

20

35.4

35.4

33.8

1.5S90E TRITON T and S

R/V Varuna Jaya, BPPT, Indonesia

New TRITON web page to be appeared from April 2004

Summary

R/V Mirai cruise in the Indian Ocean: ・ Next R/V Mirai TRITON cruise will be conducted June-July 2004 (departing on 4 July from Darwin, Australia and return on 1 August 2004 to Hachinohe, Japan).

Present status of Indian Ocean TRITON at1.5S90E & 5S95E: ･ This year, we recovered and re-deployed successfully the 1.5S90E TRITON, but we could not recover nor re-deploy the 5S95E due to the strong SE monsoon winds during the June-July R/V Mirai cruise.

･ The TRITON buoy at 5S95E have been recovered on 11 November 2003 by R/V Baruna Jaya 1 of BPPT Indonesia, but no re-deployment. All the met sensors had been stolen on the buoy, but we may have the internal data record of underwater sensors. We could avoid the lost of the buoy and save the internal record data, but since then, the data gap has started until the next R/V Mirai cruise.

Data delivery: ・ The data from TRITON buoys and detailed information on the project can be obtained from TRITON home page.http://www.jamstec.go.jp/jamstec/TRITON/

・ TRITON real time salinity data has been distributed through GTS since January 2003.

・ Re-constructing TRITON web data display and delivery system targeting the end of April 2004 to deliver all TRITON T and S. This early version web will deal real time T and S data of no quality control using post calibration data.

・ The second version can deal quality controlled T and S data will appear early 2005.

OASIS (Japan)OOS (India)

Deep Sea buoys (India)

Planed mooringsOn-going moorings

Shallow Water buoys (India)

OASIS

OOS

Deep Sea & Shallow Water Buoys

I-MAP A multi-national project to observe ocean conditions in the tropical western Indian Ocean. TAO-type buoys.

LODYC Upward looking ADCP mooring at 76E on the equator. Two additional ADCPs on the top of OOS buoys, or independent locations.

INSTANT An international project to measure the flow from the Pacific to the Indian Oceans. Current meters, ADCP, etc.

PMEL TAO-type array on the equator at first, and expand to off-equatorial area.

I-MAP (multi-national, leaded by South Africa)

INSTANT (multi-national)

LODYC (France)

Plan for mooring array in the tropical Indian Ocean