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Coastal Upwelling and Its Teleconnections with Large Scale Indices in a Changing Environment along the Southwest Coast of India

Author

Listed:
  • Muni Krishna K

    (Department of Meteorology and Oceanography, Andhra University, India)

  • Manjunatha Based

    (Department of Marine Geology, Mangalore University, India)

Abstract

Coastal upwelling process along the southwest coast of India (SCI) is dominated by the seasonal reversal of winds between the southwest and northeast monsoons. Variations in the coupled ocean-atmospheric system impact upwelling patterns and other climatic elements in SCI. Changes in the upwelling system in turn modify sea surface temperatures, sea level heights, and coastal climate. This study examines upwelling patterns from 1946-2005 along the SCI, and ties these patterns to variations in air-sea interactions. While upwelling is controlled daily mostly by local characteristics of winds, coastal topography and bathymetry, large atmospheric feature such as Pacific Decadal Oscillation, Northern Oscillation Index and El Niño /La Nina events dominate local conditions. Study of monthly sea surface temperature anomaly (SSTA) and Ekman Transport (ET) along the SCI reveals that both SSTA and ET are found to be low and high during the study period and both having significant strong relation (significant at 99.9% level). Results from this indicate that air-sea interactions on a large-scale do explain trends and variability of upwelling along the SCI. Additionally, these findings also point to the possible influences of global warming. Furthermore, local climatic records reveal the influence of coastal atmospheric/oceanic variations on SCI climate.

Suggested Citation

  • Muni Krishna K & Manjunatha Based, 2018. "Coastal Upwelling and Its Teleconnections with Large Scale Indices in a Changing Environment along the Southwest Coast of India," Oceanography & Fisheries Open Access Journal, Juniper Publishers Inc., vol. 6(4), pages 86-91, March.
    • Handle: RePEc:adp:jofoaj:v:6:y:2018:i:4:p:86-91
    DOI: 10.19080/OFOAJ.2018.06.555692
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