Abstract
Seasonal variation of the hydrography along the southeast Arabian Sea is described using data collected onboard FORV Sagar Sampada in September–October 2003 (later phase of Southwest monsoon, SWM) and March–April 2004 (Spring inter monsoon, SIM). During the later phase of the SWM, upwelling was in the withdrawal phase and the frontal structure was clearer in the northern sections (13 and 15°N lat) indicating strong upwelling in the area. The driving force of upwelling is identified as the combination of alongshore wind stress and remote forcing with a latitudinal variability. Although a more prominent upwelling was found in the north, a maximum surface Chlorophyll-a was found in the south (10°N). During the SIM, the area was characterized by oligotrophic water with relatively high Sea Surface Temperature (>29°C) and low salinity (33.8 to 35.4). During March, the surface hydrography was found to be controlled mainly by the intrusion of low-saline waters from the south, while during September by the high saline water from the north. The presence of various water masses [Arabian Sea High Salinity Water (ASHSW), Persian Gulf Water (PGW), Red Sea Water (RSW)] and their seasonal variations in the region is discussed and their decreasing influence towards the south is noted during both periods of observation. During the SWM, the dynamic topography showed the equator-ward flow of the West India Coastal Current (WICC) at the surface and a pole-ward coastal under current at sub-thermocline depth. During the SIM, surface circulation revealed the WICC flowing pole-ward north of 13°N, but equator-ward flow in the south, with a clockwise circulation around the Lakshadweep High.
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References
Antony, M. K. (1990). Northward undercurrent along West coast of India during upwelling – some inferences. Indian Journal of Marine Sciences, 19, 95–105.
Banse, K. (1959). On upwelling and bottom trawling off the Southwest coast of India. Journal of the Marine Biological Association of India, 1, 33–49.
Bearman, G. (1989). Coastal upwelling in eastern boundary currents. In Bearman (Ed.), Ocean circulation (p. 118). Oxford: Pergamon Press.
Bruce, J. G., Johnson, D. R., & Kindle, J. C. (1994). Evidence for eddy formation in the Eastern Arabian Sea during the northeast monsoon. Journal of Geophysical Research, 99, 7651–7664.
Bruce, J. G., Kindle, J. C., Kantha, L. H., Kerling, J. L., & Bailey, J. F. (1998). Recent observations and modeling in the Arabian Sea Laccadive high region. Journal of Geophysical Research, 103, 7593–7600.
Darbyshire, M. (1967). The surface waters off the coast of Kerala, Southwest India. Deep Sea Research, 14, 295–320.
Huntsman, S. A., & Barber, R. T. (1977). Primary production of North West Africa: The relationship with wind and nutrient conditions. Deep Sea Research, 24, 25–34.
Jayaraman, R., Ramamirtham, C. P., Sundararamam, K. V., & Aravindakshan Nair, C. P. (1960). Hydrography of the Laccadive offshore waters. Journal of the Marine Biological Association of India, 2(1), 24–34.
Johannessen, O. M., Subbaraju, G., & Blindhejm, J. (1981). Seasonal variations of the oceanographic conditions off the Southwest coast of India during 1971–1975. Fiskeridirektoratets Skrifter, Serie Havundersøkelser, 18, 247–261.
Joseph, P. V. (1990). Warm pool over the Indian Ocean and monsoon onset. Tropical Ocean Newsletter, 53, 1–5.
Joseph, W. L., & Kantha, L. H. (2000). Results from a numerical model of the Northern Indian Ocean: Circulation in the South Arabian Sea. Journal of Marine Systems, 24, 97–117.
Mann, K. H., & Lazier, J. R. N. (1996). Dynamics of marine ecosystem: Biological–physical interactions in the ocean (2nd ed.). Cambridge, MA, U.S.A.: Blackwell Science.
McCreary, J. P., Kundu, P. K., & Molinari, R. L. (1993). A numerical investigations of the dynamics, thermodynamics and mixed-layer processes in the Indian Ocean. Progress in Oceanography, 31, 181–244.
Muraleedharan, P. M., & Prasanna Kumar, S. (1996). Arabian Sea upwelling – a comparison between coastal and open ocean regions. Current Science, 71, 824–846.
Muraleedharan, P. M., Ramesh Kumar, M. R., & Gangadhara Rao, L. V. (1995). A note on poleward undercurrent along the Southwest coast of India. Continental Shelf Research, 15, 165–184.
Patil, M. R., & Ramamirtham, C. P. (1963). Hydrography of the Laccadive offshore waters – a study of winter conditions. Journal of the Marine Biological Association of India, 5(2), 159–169.
Prasad, T. G., Ikeda, M., & Prasanna Kumar, S. (2001). Seasonal spreading of the Persian Gulf Water mass in the Arabian Sea. Journal of Geophysical Research, 106, 17059–17071.
Prasanna Kumar, S., Jayu, N., Ajoy, K., Shaji, C., Anand, P., Sabu, P., et al. (2004). Intrusion of the Bay of Bengal water into the Arabian Sea during winter monsoon and associated chemical and biological response. Geophysical Research Letters, 31, L15304. Retrieved from doi:10.1029/2004GL020247.
Prasanna Kumar, S., & Prasad, T. G. (1999). Formation and spreading of Arabian Sea high-salinity water mass. Journal of Geophysical Research, 104, 1455–1464.
Prell, W. L., & Streeter, H. F. (1982). Temporal and spatial patterns of monsoonal upwelling along Arabia: A modern analogue for the interpretation of quaternary SST anomalies. Journal of Marine Research, 40, 143–155.
Ramamirtham, C. P., & Jayaraman, R. (1960). Hydrographical features of the continental shelf waters off Cochin during the years 1958 & 1959. Journal of the Marine Biological Association of India, 2(2), 199–207.
Ramesh Babu, V., Varkey, M. J., Kesava Das, V., & Gouveia, A. D. (1980). Water masses and general hydrography along the West coast of India during early March. Indian Journal of Marine Sciences, 9, 82–89.
Rochford, D. J. (1964). Salinity maxima in the upper 1000 meters of the North Indian Ocean. Australian Journal of Marine and Freshwater Research, 15, 1–24.
Sastry, A. A., & Myrland, P. (1959). Distribution of temperature, salinity and density in the Arabian Sea along the South Malabar Coast (South India) during the post-monsoon season. Indian Journal of Fisheries, 6(2), 223–255.
Shankar, D., & Shetye, S. R. (1997). On the dynamics of the Lakshadweep high low in the Southeastern Arabian Sea. Journal of Geophysical Research, 102, 12551–12562.
Shankar, D., Vinayachandran, P. N., & Unnikrishnan, A. S. (2002). The monsoon currents in the North Indian Ocean. Progress in Oceanography, 52, 63–120.
Sharma, G. S. (1978). Upwelling off the Southwest coast of India. Indian Journal of Marine Sciences, 7, 209–218.
Shenoi, S. S. C., Shankar, D., Michael, G. S., Kurian, J., Varma, K. K., Ramesh Kumar, M. R., et al. (2005). Hydrography and water masses in the Southeastern Arabian Sea during March–June 2003. Journal of Earth System Science, 114(5), 475–491.
Shenoi, S. S. C., Shankar, D., & Shetye, S. R. (1999). On the sea surface temperature high in the Lakshadweep Sea before the onset of the southwest monsoon. Journal of Geophysical Research, 104, 15703–15712.
Shenoi, S. S. C., Shankar, D., & Shetye, S. R. (2004). Remote forcing annihilates barrier layer in Southeastern Arabian Sea. Geophysical Research Letters, 31, L15307. Retrieved from doi:10.1029/2003GL019270.
Shetye, S. R., Gouveia, A. D., Shenoi, S. S. C., Sundar, D., Michael, G. S., Almedia, A. M., et al. (1990). Hydrography and circulation off the West coast of India during the southwest monsoon 1987. Journal of Marine Research, 48, 359–378.
Shetye, S. R., Gouveia, A. D., Shenoi, S. S. C., Sundar, D., Michael, G. S., Almeida, A. M., et al. (1991). The coastal current off Western India during the northeast monsoon. Deep Sea Research, 38, 1517–1529.
Shetye, S. R., Shenoi, S. S. C., Antony, M. K., & Krishna Kumar, V. (1985). Monthly mean wind stress along the coast of the North Indian Ocean. Proceedings of Indian Academy of Sciences (Earth and Planetary Sciences), 94(2), 129–137.
Small, L. F. (1973). Chlorophyll and optical properties in CUE-I upwelling region. In N. K. Moores & J. S. Allen (Eds.), Final report of the coastal upwelling, ecosystem analysis, summer 1973, theoretical workshop. Washington: NSF/IOOE Office.
Small, L. F., & Menzies, D. W. (1981). Patterns of primary productivity and biomass in a coastal upwelling region. Deep Sea Research, 28A, 123–149.
Strickland, J. D. H., & Parsons, T. R. (1972). A practical handbook of seawater analysis. In Fisheries Research Board of Canada Bulletin 177 (2nd ed., p. 310). Ottawa: Queen’s Printer
Varadachari, V. V. R., Murty, C. S., & Sankaranarayanan, V. N. (1974). Physical characteristics of waters & water masses off the West coast of India during late spring. Indian Journal of Marine Sciences, 3, 1–3.
Varkey, M. J., Kesava Das, V., & Rama Raju, D. V. (1979). Physical characteristics of the Laccadive sea (Lakshadweep). Indian Journal of Marine Sciences, 8, 203–210.
Wyrtki, K. (1971). Oceanographic atlas of the International Indian Ocean expedition. Washington D.C.: National Science Foundation, U.S. Government of Printing Office.
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Vimal Kumar, K.G., Dinesh Kumar, P.K., Smitha, B.R. et al. Hydrographic characterization of southeast Arabian Sea during the wane of southwest monsoon and spring intermonsoon. Environ Monit Assess 140, 231–247 (2008). https://doi.org/10.1007/s10661-007-9863-3
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DOI: https://doi.org/10.1007/s10661-007-9863-3