• The monsoon system: Land–sea breeze or the ITCZ?

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/127/01/0001

    • Keywords

       

      Indian summer monsoon; monsoonal regions; intertropical convergence zone; equatorial trough; heat lows.

    • Abstract

       

      For well over 300 years, the monsoon has been considered to be a gigantic land–sea breeze driven by the land–ocean contrast in surface temperature. In this paper, this hypothesis and its implications for the variability of the monsoon are discussed and it is shown that the observations of monsoon variability donot support this popular theory of the monsoon. An alternative hypothesis (whose origins can be traced to Blanford’s (1886) remarkably perceptive analysis) in which the basic system responsible for the Indian summer monsoon is considered to be the Intertropical Convergence Zone (ITCZ) or the equatorial trough, is then examined and shown to be consistent with the observations. The implications of considering the monsoon as a manifestation of the seasonal migration of the ITCZ for the variability of the Indian summer monsoon and for identification of the monsoonal regions of the world are briefly discussed.

    • Author Affiliations

       

      Sulochana Gadgil1

      1. Centre for Atmospheric & Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, India.
    • Dates

       
  • Journal of Earth System Science | News

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