1. FORSGC/JAMSTEC Indian Ocean Activities

2. Subsurface ADCP Mooring System
Location: 0N, 90E
Data interval: 1 hours
Ping interval: 6.66 sec
1 data = 27 pings average
Obs. range: 8m X 50 layers
11 months
9 months
12 months
Nov.
2000
Oct.
2001
Jul.
2002
Jul.
2003

3. Zonal currents at 0N, 90E 2001 2002 2002 2003 Period 1 Period 2

4. Power spectrum density of currents at 0N, 90E
Broad time-scale with strong days
variability, shallower than 120 m depth
10-20 days variability above 100 m depth

5. Monthly mean zonal currents at 0N, 90E
Typical Wyrtki jet structure

6. 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.

7. Wavelet analysis for meridional 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.

8. Status of TRITON Array 1. Development of TRITON Array
Yoshifumi Kuroda
JAMSTEC
Jan 2004
1. Development of TRITON Array
2. Data from Indian Ocean TRITON
3. TRITON web page update plan
今回の話は海洋センターが実施している太平洋熱帯域の観測システムとしてのトライトンブイネットワークの現状を中心として，これまでの経緯やこれからの計画についてと，並行して実施しているアルゴフロートの展開についてです。

9. Configuration of the TRITON
First of all, I explain the configuration of the TRITON mooring system. The mooring system is fixed on the sea bottom using 4 ton anchor. The mooring line is made up of nylon ropes and wire cable. The wire cable is connected to the surface float. The wire cable is equipped with 10 conductivity & Temperature sensors, 2 conductivity, temperature & depth sensors and 1 current meter.(click)[to 3]

10. Development of TRITON buoy array from 1998 to 2002
March, 1998
March, 1999
March, 2000
August, 2002
March, 2001
March, 2002
Purposes;
1. Monitoring ENSO as TAO/TRITON array
2. 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

11. High salinity water intrusion from Arabian Sea
　　　TRITON　Temperature　1.5S90E
　　　　TRITON　Salinity　1.5S90E 28 20
35.4
Warm water accumulation associated with eastward jet in monsoon break period
High salinity water intrusion from Arabian Sea
　　　TRITON　Temperature　5S95E
　　　　TRITON　Salinity　5S95E
33.8 20
35.4

12. 1.5S90E TRITON T and S

13. R/V Varuna Jaya, BPPT, Indonesia

14. New TRITON web page to be appeared from April 2004

15. R/V Mirai cruise in the Indian Ocean:
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.

16. Data delivery:
・The data from TRITON buoys and detailed information on the project
can be obtained from TRITON home page.
・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.

17. Plan for mooring array in the tropical Indian Ocean
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.