Indian Equatorial Moorings A Programme Funded by the Department of Ocean Development Government of India Principal Investigator: Dr. V.S.N. Murty National Institute of Oceanography Dona Paula, Goa, India The 6 th CLIVAR Asian-Australian Monsoon Panel and the 1 st CLIVAR/IOC Indian Ocean Panel Joint Meeting February 2004 Indian Institute of Tropical Meteorology, Pune

93E, 83E and 76E.

Station No. Deployment/Recovery of moorings D: date of deployment R: date of recovery EQCM 1 93°E D 13 Feb R 21 Dec D 23 Dec R 30 Mar D 01 Apr R 23 Sep D 25 Sep R …… EQCM 2 83°E D 14 Dec R 24 Mar D 26 Dec R 17 Sep D 19 Sep R ……. EQCM 3 76°E D 20 Mar R 08 Sep D 10 Sep R ……. Status of Deep-sea Current meter moorings

Station No. Mean depths of RCMs (m) I II III IV EQCM1 93°E 135, 280, 487, 983, 1996, , 264, 462, 966, 1969, , 344, 529, 1032, 2004, 4015 EQCM2 83°E 385, 590, 1072, 2081, , 343, 545, 1047, 2049, 4052 EQCM 3 76°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 :

Annual variation of Pressure, temperature and currents at Equator, 93E during

Depth-wise variation of SD of zonal (red) and meridional (blue) velocities (cm/s) 76°E 83°E 93°E

Spectra of zonal (red) and meridional (blue) currents at Eq., 93°E at 100 m during

Prepared scientific papers for publication: 11 nos 1. 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, 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, Proceedings of Pan Ocean Remote Sensing Conference (PORSEC) held at Bali, Indonesia during 3-6 December, 2002, Vol. I, 29-33, 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, Proceedings of Pan Ocean Remote Sensing Conference (PORSEC) held at Bali, Indonesia during 3-6 December, 2002, Vol. I, 25-28, 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 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 Abstract submitted to the International workshop on INDOCLIM to be held at IITM, Pune during February, 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