Abstract
This paper describes the hydrographic observations in the southeastern Arabian Sea (SEAS) during two cruises carried out in March–June 2003 as part of the Arabian Sea Monsoon Experiment. The surface hydrography during March–April was dominated by the intrusion of low-salinity waters from the south; during May–June, the low-salinity waters were beginning to be replaced by the highsalinity waters from the north. There was considerable mixing at the bottom of the surface mixed layer, leading to interleaving of low-salinity and high-salinity layers. The flow paths constructed following the spatial patterns of salinity along the sections mimic those inferred from numerical models. Time-series measurements showed the presence of Persian Gulf and Red Sea Waters in the SEAS to be intermittent during both cruises: they appeared and disappeared during both the fortnight-long time series.
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References
Anonymous 1996 TASK: Tidal Analysis Software Kit, Proudman Oceanographic Laboratory, Bidston, UK.
Anonymous 2001 Arabian Sea Monsoon Experiment (ARMEX): Science plan, Department of Science and Technology, New Delhi.
Babu R V, Varkey M J, Kesava Das V and Gouveia A D 1980 Water masses and general hydrography along the west coast of India during early March;Indian J. Mar. Sci. 9 82–89.
Banse K 1968 Hydrography of the Arabian Sea shelf of India and Pakistan and effects on demersal fishes;Deep-Sea Res. 15 45–79.
Beal L, Ffield A and Gordon A L 2000 Spreading of Red Sea overflow waters in the Indian Ocean;J. Geophys. Res. 105 8549–8564.
Bruce J G, Johnson D R and Kindle J C 1994 Evidence for eddy formation in the eastern Arabian Sea during the northeast monsoon;J. Geophys. Res. 99 7651–7664.
Bruce J G, Kindle J C, Kantha L H, Kerling J L and Bailey J F 1998 Recent observations and modeling in the Arabian Sea Laccadive High region;J. Geophys. Res. 103 7593–7600.
Gadgil S, Srinivasan J, Nanjundiah R S, Krishnakumar K, Munot A A and Rupakumar K 2002 On forecasting the Indian summer monsoon: The intriguing summer of 2002;Curr. Sci. 83 394–403.
Han W and McCreary J P 2001 Modeling salinity distributions in the Indian Ocean;J. Geophys. Res. 106 859–877.
Hareeshkumar P V, Mohankumar N and Radhakrishnan K G 1995 Multiple sub-surface maxima in vertical salinity structure: A case study;Indian J. Mar. Sci. 24 77–81.
Hareeshkumar P V and Mohankumar N 1996 On the flow and thermohaline structure off Cochin during premonsoon season;Cont. Shelf Res. 16 457–468.
Johannessen O M, Subharaju G and Blindheim J 1981 Seasonal variation of the oceanographic conditions off the southwest coast of India during 1971-75.Fiskdir. Skr. Ser. HavUnders. 18 247–261.
Joseph P V 1990 Warm pool over the Indian Ocean and monsoon onset;Tropical Ocean-Atmosphere Newsletter 53 1–5.
Kumar S P and Prasad T G 1999 Formation and spreading of Arabian Sea High-Salinity water massJ. Geophys. Res. 104 1455–1464.
Levitus S and Boyer T P 1994 World Ocean Atlas 1994: Volume 4: Temperature, NOAA Atlas NESDIS 4.
Levitus S, Burgett R, Boyer T P 1994 World Ocean Atlas 1994: Vol. 3: Salinity, NOAA Atlas NESDIS 3.
McCreary J P, Kundu P K and Molinari R L 1993 A numerical investigation of the dynamics, thermodynamics and mixed-layer processes in the Indian Ocean;Progr. Oceanogr. 31 181–244.
McCreary J P, Han W, Shankar D and Shetye S R 1996, Dynamics of the East India Coastal Current, 2. Numerical solutions;J. Geophys. Res. 101 13,993–14,010.
Prasad T G, Ikeda M and Kumar S P 2001 Seasonal spreading of Persian Gulf water mass in the Arabian Sea;J. Geophys. Res. 106 17,059–17,071.
Rao R R and Sivakumar R 1999 On the possible mechanisms of the evolution of a mini-warm pool during the pre-summer monsoon season and the onset vortex in the southeastern Arabian Sea; Q.J. R. Meteorol. Soc. 125 787–809.
Rao R R and Sivakumar R 2003 Seasonal variability of sea surface salinity and salt budget of the mixed layer of the north Indian Ocean;J. Geophys. Res. 108 3009 doi:10.1029/2001JC000907.
Reynolds R and Smith T 1994 Improved global sea surface temperature analyses using optimum interpolation;J. Clim. 7 929–948.
Rochford D J 1964 Salinity maxima in the upper 1000 m of the north Indian Ocean;Aust. J. Mar. Freshw. Res. 15 1–24.
Schott F and McCreary J P 2001 The monsoon circulation in the Indian Ocean;Progr. Oceanogr. 51 1–123.
Shankar D, Gopalakrishna V V, Shenoi S S C, Durand F, Shetye S R, Rajan C K, Zacharias J, Araligidad N and Michael G S 2004 Observational evidence for westward propagation of temperature inversions in the southeastern Arabian Sea;Geophys. Res. Lett. 31 doi:10.1029/2004GL19652.
Shankar D and Shetye S R 1997 On the dynamics of the Lakshadweep high and low in the southeastern Arabian Sea;J. Geophys. Res. 102 12,551–12,562.
Shankar D, Vinayachandran P N and Unnikrishnan A S 2002 The monsoon currents in the north Indian Ocean;Progr. Oceanogr. 52 63–120.
Shankar D, Shenoi S S C, Nayak R K, Vinayachandran P N, Nampoothiri G S, Almeida A M, Michael G S, Ramesh Kumar M R, Sundar D and Sreejith O P 2005 Hydrography of the eastern Arabian Sea during summer monsoon 2002;J. Earth Syst. Sci., this issue.
Shapiro G L, Meschanov S L and Polonsky A B 1994 Red Sea water lens formation in Arabian Sea;Oceanology 36 24–31.
Sharma G S 1968 Seasonal variation of some hydrographic properties of the shelf waters off the west coast of India;Bull. Nat. Inst. Sci. India 38 263–275.
Shenoi S S C, Shetye S R, Gouveia A D and Michael G S 1993 Salinity extrema in the Arabian Sea; In:Monsoon Bio-geochemistry (eds) V Ittekkot and R R Nair,Mitt. Geol.-PalÄont. Inst. Univ. Hamburg 76 37–49.
Shenoi S S C, Shankar D and Shetye S R 1999 On the sea surface temperature high in the Lakshadweep Sea before the onset of the southwest monsoon;J. Geophys. Res. 104 15,703–15,712.
Shenoi S S C, Shankar D and Shetye S R 2004 Remote forcing annihilates barrier layer in southeastern Arabian Sea;Geophys. Res. Lett. 31 L05307, doi:10.1029/2003GL019270.
Shenoi S S C, Shankar D, Gopalkrishna V V and Durand F 2005 Role of ocean in the genesis and annihilation of the core of the warm pool in the southeastern Arabian Sea;Mausam 56 147–168.
Shetye S R, Gouveia A D, Shenoi S S C, Sundar D, Michael G S, Almeida A M and Santanam K 1990 Hydrography and circulation off the west coast of India during southwest monsoon;J. Mar. Res. 48 359–378.
Shetye S R, Gouveia A D, Shenoi S S C, Michael G S, Sundar D, Almeida A M and Santanam K 1991 The coastal current off western India during the northeast monsoon;Deep-Sea Res. 38 1517–1529.
Varkey M J, Das V K and Ramaraju D V 1979 Physical characteristics of the Laccadive Sea (Lakshadweep);Indian J. Mar. Sci. 8 203–210.
Vinayachandran P N and Shetye S R 1991 The warm pool in the Indian Ocean;Proc. Indian Acad. Sci. (Earth Planet. Sci.) 100 165–175.
Vinayachandran P N 2004 Summer cooling of the Arabian Sea during contrasting monsoons;Geophys. Res. Lett. 31 L13306, doi:10.1029/2004GL019961.
Wyrtki K 1971 Oceanographic atlas of the International Indian Ocean Expedition, National Science Foundation, Washington, D.C., U.S.A.
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Shenoi, S.S.C., Shankar, D., Michael, G.S. et al. Hydrography and water masses in the southeastern Arabian Sea during March–June 2003. J Earth Syst Sci 114, 475–491 (2005). https://doi.org/10.1007/BF02702024
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DOI: https://doi.org/10.1007/BF02702024