Journal of Earth System Science

, Volume 114, Issue 5, pp 475–491

Hydrography and water masses in the southeastern Arabian Sea during March–June 2003

  • S. S. C. Shenoi
  • D. Shankar
  • G. S. Michael
  • J. Kurian
  • K. K. Varma
  • M. R. Ramesh Kumar
  • A. M. Almeida
  • A. S. Unnikrishnan
  • W. Fernandes
  • N. Barreto
  • C. Gnanaseelan
  • R. Mathew
  • K. V. Praju
  • V. Mahale
Article

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.

Keywords

Warm pool monsoon circulation upwelling 

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References

  1. Anonymous 1996 TASK: Tidal Analysis Software Kit, Proudman Oceanographic Laboratory, Bidston, UK.Google Scholar
  2. Anonymous 2001 Arabian Sea Monsoon Experiment (ARMEX): Science plan, Department of Science and Technology, New Delhi.Google Scholar
  3. 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.Google Scholar
  4. Banse K 1968 Hydrography of the Arabian Sea shelf of India and Pakistan and effects on demersal fishes;Deep-Sea Res. 15 45–79.Google Scholar
  5. 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.CrossRefGoogle Scholar
  6. 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.CrossRefGoogle Scholar
  7. 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.CrossRefGoogle Scholar
  8. 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.Google Scholar
  9. Han W and McCreary J P 2001 Modeling salinity distributions in the Indian Ocean;J. Geophys. Res. 106 859–877.CrossRefGoogle Scholar
  10. 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.Google Scholar
  11. Hareeshkumar P V and Mohankumar N 1996 On the flow and thermohaline structure off Cochin during premonsoon season;Cont. Shelf Res. 16 457–468.CrossRefGoogle Scholar
  12. 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.Google Scholar
  13. Joseph P V 1990 Warm pool over the Indian Ocean and monsoon onset;Tropical Ocean-Atmosphere Newsletter 53 1–5.Google Scholar
  14. Kumar S P and Prasad T G 1999 Formation and spreading of Arabian Sea High-Salinity water massJ. Geophys. Res. 104 1455–1464.CrossRefGoogle Scholar
  15. Levitus S and Boyer T P 1994 World Ocean Atlas 1994: Volume 4: Temperature, NOAA Atlas NESDIS 4.Google Scholar
  16. Levitus S, Burgett R, Boyer T P 1994 World Ocean Atlas 1994: Vol. 3: Salinity, NOAA Atlas NESDIS 3.Google Scholar
  17. 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.CrossRefGoogle Scholar
  18. 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.CrossRefGoogle Scholar
  19. 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.Google Scholar
  20. 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.CrossRefGoogle Scholar
  21. 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.CrossRefGoogle Scholar
  22. Reynolds R and Smith T 1994 Improved global sea surface temperature analyses using optimum interpolation;J. Clim. 7 929–948.CrossRefGoogle Scholar
  23. Rochford D J 1964 Salinity maxima in the upper 1000 m of the north Indian Ocean;Aust. J. Mar. Freshw. Res. 15 1–24.CrossRefGoogle Scholar
  24. Schott F and McCreary J P 2001 The monsoon circulation in the Indian Ocean;Progr. Oceanogr. 51 1–123.CrossRefGoogle Scholar
  25. 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.Google Scholar
  26. 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.CrossRefGoogle Scholar
  27. Shankar D, Vinayachandran P N and Unnikrishnan A S 2002 The monsoon currents in the north Indian Ocean;Progr. Oceanogr. 52 63–120.CrossRefGoogle Scholar
  28. 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.Google Scholar
  29. Shapiro G L, Meschanov S L and Polonsky A B 1994 Red Sea water lens formation in Arabian Sea;Oceanology 36 24–31.Google Scholar
  30. 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.Google Scholar
  31. 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.Google Scholar
  32. 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.CrossRefGoogle Scholar
  33. 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.CrossRefGoogle Scholar
  34. 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.Google Scholar
  35. 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.CrossRefGoogle Scholar
  36. 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.CrossRefGoogle Scholar
  37. 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.Google Scholar
  38. 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.Google Scholar
  39. Vinayachandran P N 2004 Summer cooling of the Arabian Sea during contrasting monsoons;Geophys. Res. Lett. 31 L13306, doi:10.1029/2004GL019961.CrossRefGoogle Scholar
  40. Wyrtki K 1971 Oceanographic atlas of the International Indian Ocean Expedition, National Science Foundation, Washington, D.C., U.S.A.Google Scholar

Copyright information

© Indian Academy of Sciences 2005

Authors and Affiliations

  • S. S. C. Shenoi
    • 1
  • D. Shankar
    • 1
  • G. S. Michael
    • 1
  • J. Kurian
    • 2
  • K. K. Varma
    • 3
  • M. R. Ramesh Kumar
    • 1
  • A. M. Almeida
    • 1
  • A. S. Unnikrishnan
    • 1
  • W. Fernandes
    • 1
  • N. Barreto
    • 1
  • C. Gnanaseelan
    • 4
  • R. Mathew
    • 1
  • K. V. Praju
    • 5
  • V. Mahale
    • 1
  1. 1.National Institute of OceanographyGoaIndia
  2. 2.Indian Institute of ScienceBangaloreIndia
  3. 3.College of FisheriesKerala Agricultural UniversityKochiIndia
  4. 4.Indian Institute of Tropical MeteorologyPuneIndia
  5. 5.Cochin University of Science and TechnologyKochiIndia

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