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RESPONSE OF THE ARABIAN SEA TO SUMMER MONSOONS OF 2002 AND 2003

RESPONSE OF THE ARABIAN SEA TO SUMMER MONSOONS OF 2002 AND 2003. P.N. Vinayachandran Centre for Atmospheric and Oceanic Sciences Indian Institute of Science Bangalore vinay@caos.iisc.ernet.in. Argo Science Workshop, Nov 12 – 14, 2003, Tokyo.

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RESPONSE OF THE ARABIAN SEA TO SUMMER MONSOONS OF 2002 AND 2003

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  1. RESPONSE OF THE ARABIAN SEA TO SUMMER MONSOONS OF 2002 AND 2003 P.N. Vinayachandran Centre for Atmospheric and Oceanic Sciences Indian Institute of Science Bangalore vinay@caos.iisc.ernet.in Argo Science Workshop, Nov 12 – 14, 2003, Tokyo

  2. This study is funded by Indian Argo Project, INCOIS, Dept. of Ocean Development, Govt. of India. Thanks to Argo Project Office / IOC, UNESCO for supporting this travel.

  3. HR Wind Stress Climatology (dyne / cm2)

  4. WOA2001 Sea Surface Temperature (°C)

  5. Wind Stress Curl Climatology (10-6 dynes / cm3)

  6. WOA2001 Mixed Layer Depth (m)

  7. WOA2001 Thermocline Depth (m)

  8. How well does the Argo data represent this response?

  9. The Indian Monsoon Rainfall was 19% deficit during 2002 and 2% excess during 2003.

  10. QSCAT Winds : 2002-2003

  11. Is there a significant difference in the response of the Arabian Sea to contrasting monsoons?

  12. Location of floats Mar – Oct 2002 Mar – Oct 2003

  13. Sea Surface Temperature : 2002 minus 2003

  14. Mixed Layer Depth : 2002 minus 2003

  15. Thermocline Depth : 2002 minus 2003

  16. Location of Floats : Mar – Oct 2002 / 2003

  17. Comparison of 2002 and 2003 : 89 (Argo)

  18. Comparison of 2002 and 2003 :89 (TMI)

  19. Comparison of 2002 and 2003 :159( Argo)

  20. Comparison of 2002 and 2003 :159(TMI)

  21. Comparison of 2002 and 2003 :163(Argo)

  22. Comparison of 2002 and 2003 :163(TMI)

  23. Differences from pre-monsoon condition during 21-31 April Sea Surface Temperature

  24. Differences from pre-monsoon condition during 21-31 April Mixed Layer Depth

  25. Differences from pre-monsoon condition during 21-31 April Thermocline Depth

  26. QSCAT : Wind Speed

  27. QSCAT : Wind Stress Curl

  28. Argo Dynamic Height (dyn. cm)

  29. Conclusions • The central Arabian Sea was warmer during summer monsoon in 2003 than in 2002. • The late onset of southwesterlies during 2003 appears to have led to this high SST . • The stronger winds during July 2003 • failed to flip the sign.

  30. Argo SeaSurfaceTemperature2003

  31. Thank You

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