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Interannual variability of upwelling indices in the Southeastern Arabian Sea: A satellite based study

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Abstract

Increase in sea surface temperature with global warming has an impact on coastal upwelling. Past two decades (1988 to 2007) of satellite observed sea surface temperatures and space borne scatterometer measured winds have provided an insight into the dynamics of coastal upwelling in the southeastern Arabian Sea, in the global warming scenario. These high resolution data products have shown inconsistent variability with a rapid rise in sea surface temperature between 1992 and 1998 and again from 2004 to 2007. The upwelling indices derived from both sea surface temperature and wind have shown that there is an increase in the intensity of upwelling during the period 1998 to 2004 than the previous decade. These indices have been modulated by the extreme climatic events like El-Nino and Indian Ocean Dipole that happened during 1991–92 and 1997–98. A considerable drop in the intensity of upwelling was observed concurrent with these events. Apart from the impact of global warming on the upwelling, the present study also provides an insight into spatial variability of upwelling along the coast. Noticeable fact is that the intensity of offshore Ekman transport off 8°N during the winter monsoon is as high as that during the usual upwelling season in summer monsoon. A drop in the meridional wind speed during the years 2005, 2006 and 2007 has resulted in extreme decrease in upwelling though the zonal wind and the total wind magnitude are a notch higher than the previous years. This decrease in upwelling strength has resulted in reduced productivity too.

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Authors and Affiliations

  1. Nansen Environmental Research Centre (India), Gopal Residency, Tottekkat Road, 682011, Kochi-11, Kerala, India

    Chiranjivi Jayaram & K. Ajith Joseph

  2. Indian National Centre for Ocean Information Services, Ocean Valley, IDA Jeedimetla P.O. Box 21, Hyderabad — 55, Andhra Pradesh, 500055, India

    Neethu Chacko

  3. Department of Physical Oceanography, Cochin University of Science & Technology, Lakeside Campus, Fine Arts Avenue, Kochi-16, Kerala, 682016, India

    Chiranjivi Jayaram & A. N. Balchand

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  1. Chiranjivi Jayaram
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  2. Neethu Chacko
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  4. A. N. Balchand
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Correspondence to Chiranjivi Jayaram.

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Jayaram, C., Chacko, N., Joseph, K.A. et al. Interannual variability of upwelling indices in the Southeastern Arabian Sea: A satellite based study. Ocean Sci. J. 45, 27–40 (2010). https://doi.org/10.1007/s12601-010-0003-6

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  • DOI: https://doi.org/10.1007/s12601-010-0003-6

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