Evolution in Relationship Between Mascarene Highs and Indian Summer Monsoon In Recent Times

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Authors

  • Vineet Sharma
     Centre for Ocean, River, Atmosphere & Land Sciences (CORAL), IIT Kharagpur, West Bengal, India. ,IN
  • Amarjeet
     Centre for Ocean, River, Atmosphere & Land Sciences (CORAL), IIT Kharagpur, West Bengal, India. ,IN
  • Arun Chakraborty
     Centre for Ocean, River, Atmosphere & Land Sciences (CORAL), IIT Kharagpur, West Bengal, India. ,IN
  • Abhishek Kumar
     Centre for Ocean, River, Atmosphere & Land Sciences (CORAL), IIT Kharagpur, West Bengal, India. ,IN
  • Biplab Sadhukhan
     Centre for Ocean, River, Atmosphere & Land Sciences (CORAL), IIT Kharagpur, West Bengal, India. ,IN
  • Swarnali Dhar
     Centre for Ocean, River, Atmosphere & Land Sciences (CORAL), IIT Kharagpur, West Bengal, India. ,IN

Keywords:

Mascarene Highs (MH), Anticyclone, Global Warming Hiatus, Indian Summer Monsoon (ISM).

Abstract

Mascarene Highs (MH) is an important semi-permanent feature of Indian summer Monsoon(ISM). It is a subtropical anticyclonic feature located in the Southern Indian Ocean. The relationship between ISMR and Mascarenes highs is quite complex and is attributed to thermal and pressure gradients developed between the two regions (particularly during JJAS season) developed due to differential heating of land and water in the two regions. Global warming hiatus (comparative cooling of ocean waters in western Pacific) post 1998 have led to redistribution of thermal energy across the Indonesian through flow to the Indian ocean as a result the region has experienced rising SSTs. Declining Mean Sea Level Pressure (MSLP), rising SST and latitudinal and longitudinal shifts in the mean annual location of the centre of MH have led to reconfiguration of the relationship of Mascarene High with Indian Summer Monsoon. This changing relationship may be considered as one of many factors controlling recent revival/strengthening of Indian Summer Monsoon in recent times.

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2022-12-01

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Volume 19, Issue 2, December 2022

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