Indian Equatorial Moorings A Programme Funded by the Department of Ocean Development Government of...
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Transcript of Indian Equatorial Moorings A Programme Funded by the Department of Ocean Development Government of...
Indian Equatorial Moorings
A Programme Funded by the Department of Ocean DevelopmentGovernment of India
Principal Investigator: Dr. V.S.N. MurtyNational Institute of OceanographyDona Paula, Goa, India
The 6th CLIVAR Asian-Australian Monsoon Panel and the 1st CLIVAR/IOC Indian Ocean Panel Joint Meeting
18-20 February 2004Indian Institute of Tropical Meteorology, Pune
93E, 83E and 76E.
Station No.
Deployment/Recovery of moorings
D: date of deployment R: date of recovery
EQCM 193°E
D 13 Feb. 2000
R 21 Dec. 2000
D 23 Dec. 2000
R 30 Mar. 2002
D 01 Apr. 2002
R 23 Sep. 2003
D 25 Sep. 2003
R ……
EQCM 283°E
D 14 Dec. 2000
R 24 Mar. 2002
D 26 Dec. 2002
R 17 Sep. 2003
D 19 Sep. 2003
R …….
EQCM 3 76°E
D 20 Mar. 2002
R 08 Sep. 2003
D 10 Sep. 2003
R …….
Status of Deep-sea Current meter moorings
Station No. Mean depths of RCMs (m)
I II III IV
EQCM193°E
135, 280, 487, 983, 1996, 3995
106, 264, 462, 966, 1969, 3968
106, 344, 529, 1032, 2004, 4015
EQCM283°E
385, 590, 1072, 2081, 4095
140, 343, 545, 1047, 2049, 4052
EQCM 376°E
418, 621, 823, 1326, 2330, 4134 MicroCat
Depths of RCMs in each mooring
Added during the last deployment
One up-looking ADCP was added to the mooring at 77°E to profile the top 100m of the water column.
One Microcat CTD was attached to the mooring at 83°E at 4000
m depth. With this there are now two MicroCAT CTDs attached to two moorings.
Proposed during the next deployment
Add 2 uplooking ADCPs on the top of 83°E and 93°E moorings and one Microcat CTD at 93°E mooring.
93 E : 2002-03
Annual variation of Pressure, temperature and currents at Equator, 93E during 2002-03.
50
100
150
200
Temperature
Pressure
12
16
20
24
28
32Temperature
-50
-25
0
25
50
( °C
)cm
/s
U V
Depth-wise variation of SD of zonal (red) and meridional (blue) velocities (cm/s)
4000
3000
2000
1000
0
0 5 10 15 20
0 5 10 15 20
(a)
D
epth
(m)
0 5 10 15 20
0 5 10 15 20
(b)
0 5 10 15 20
0 5 10 15 20
(c)
76°E 83°E 93°E
Spectra of zonal (red) and meridional (blue) currents at Eq., 93°E at 100 m during 2002-03
0
500
1000
1500
2000
2500
3000
Sp
ectr
al
En
ergy
(cm
/sec)
2 /cp
d)) S
pectr
al
En
ergy
(cm
/sec)
2 /cp
d
U, VEqu,93°E, 2000-01Depth 135 m
0.02 0.04 0.06 0.08 0.100
500
1000
1500
2000
2500
3000 Frequency(cpd)
Period(days)Period(days)1010 12.512.516.6 16.650 252550
Frequency(cpd)
U, VEqu, 93°E, 2001-02Depth 106 m
0.02 0.04 0.06 0.08 0.100
500
1000
1500
2000
2500
3000
U, VEqu, 93°E, 2002-03Depth 105 m
1.02
1.04
1.06
1.08
Tem
peratu
re (
°C
)
34.732
34.734
34.736
34.738
34.740
Salin
ity (
psu
)
-12
-9
-6
-3
0
3
6
9
12 U V
Speed (
cm
/s)
Prepared scientific papers for publication: 11 nos1. Masumoto, Y., V.S.N. Murty, M. Jury, M.J. McPhaden, P. Hacker, Jerome Vialard, Robert Molcard and Gary Meyers. Tropical
Indian Ocean mooring array: Present status and future plans. Proceedings of Indian Ocean GOOS Conference held at Mauritius during 6-9 November, 2002, 2002.
2. Murty, V.S.N., A. Suryanarayana, Y.K. Somayajulu, Varsha Raikar and V. Tilvi. VM-ADCP measured upper ocean currents in the southeastern Arabian Sea and Equatorial Indian Ocean during December, 2002. Proceedings of Pan Ocean Remote Sensing Conference (PORSEC) held at Bali, Indonesia during 3-6 December, 2002, Vol. I, 29-33, 2002.
3. Murty, V.S.N., A. Suryanarayana, M.S.S. Sarma, V. Tilvi, Vijayan Fernando, G. Nampoothiri, Areef Sardar, D. Gracias and Shadashiv Khalap. First results of Indian Current meter moorings along the equator: Vertical current structure variability at equator, 93°E during February – December, 2000. Proceedings of Pan Ocean Remote Sensing Conference (PORSEC) held at Bali, Indonesia during 3-6 December, 2002, Vol. I, 25-28, 2002.
4. Murty, V.S.N., V. Ramesh Babu, Krishna Kumari, Sugandha Sardessai, Lina P. Mergulhao, Soniya Sukumaran, J. Cathrine Sumathi, Nisha S. Pires, M.K. Antony, Y.K. Somayajulu, R.J.K. Charyulu and MV.S. Guptha. Fall equatorial jet and its influence on the biogeochemical parameters in the Indian Ocean. Proceedings of IUGG 2003 IAPSO symposium on “Physical Oceanography of the Indian Ocean”, during 29 June – 11 July 2003 at Sapporo, Japan
5. Retish Senan, D. Sengupta, V. S. N. Murty, B. N. Goswami and M. S. S. Sarma. Variability of equatorial indian ocean zonal currents during 1999-2002. Proceedings of IUGG 2003 IAPSO symposium on “Physical Oceanography of the Indian Ocean”, during 29 June – 11 July 2003 at Sapporo, Japan.
6. Sengupta, D., Retish Senan, V.S. N. Murty and Vijayan Fernando. Biweekly variability of meridional currents at the equator in the eastern Indian Ocean. Proceedings of IUGG 2003 IAPSO symposium on “Physical Oceanography of the Indian Ocean”, during 29 June – 11 July, 2003 at Sapporo, Japan.
7. V.S.N. Murty, A. Suryanarayana, M.S.S. Sarma, M.K. Antony, D. Sengupta, Vijayan Fernando, G. Nampoothiri and Areef Sardar (2003). Long-term measurements of currents in the equatorial Indian Ocean through current meter moorings. (A Hindi abstract). In: Proceedings of ‘Ocean Observations System and Weather Forecasting’, 24 November, 2003, New Delhi.
8. Sengupta, D., Retish Senan, V.S. N. Murty and Vijayan Fernando (2004). A biweekly mode in the eastern Indian Ocean. To be submitted to J. Geophys. Res.
9. Murty, V.S.N., M.S.S. Sarma, M.K. Antony, D. Sengupta, A. Suryanarayana, Retish Senan, V. Tilvi, Vijayan Fernando, G. Nampoothiri, Areef Sardar and D. Gracias. Intra-seasonal variability of currents in the eastern equatorial Indian Ocean. Paper under preparation.
10. V.S.N. Murty, M.S.S. Sarma, M.K. Antony, A. Suryanarayana, Vijayan Fernando, Areef Sardar and G. Nampoothiri (2004). Variability of observed currents in the eastern equatorial Indian Ocean during 2000-2003. Abstract submitted to the International workshop on INDOCLIM to be held at IITM, Pune during 23-27 February, 2004
11. Vialard, J., D. Sengupta, V.S.N. Murty, R. Senan and M.S.S. Sarma (2004)Mixed Rossby-Gravity wave variability at monthly timescale in the equatorial Indian Ocean. Abstract. Submitted to the INDOCLIM under the Theme 2 (Describing and Understanding Indian Ocean Variability, sub-theme Intraseasonal variability in the Indian Ocean