Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean

Abstract The Mascarene High (MH) is a semi-permanent subtropical high-pressure zone in the South Indian Ocean. Apart from its large influence on African and Australian weather patterns, it also helps in driving the inter-hemispheric circulation between the Indian Ocean in the south and subcontinenta...

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Autores principales:	Vidya P.J., M. Ravichandran, M. P. Subeesh, Sourav Chatterjee, Nuncio M.
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9071f998550e4572a5cfcd8f1fff2aa2
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spelling	oai:doaj.org-article:9071f998550e4572a5cfcd8f1fff2aa22021-12-02T14:28:22ZGlobal warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean10.1038/s41598-020-59964-72045-2322https://doaj.org/article/9071f998550e4572a5cfcd8f1fff2aa22020-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-59964-7https://doaj.org/toc/2045-2322Abstract The Mascarene High (MH) is a semi-permanent subtropical high-pressure zone in the South Indian Ocean. Apart from its large influence on African and Australian weather patterns, it also helps in driving the inter-hemispheric circulation between the Indian Ocean in the south and subcontinental landmass in the north. Using observations and reanalysis products, this study for the first time investigates recent warming trend observed in the MH region during the Global Warming Hiatus (GWH) period (1998–2016). Significant positive trends are observed in sea surface temperature (SST), sea surface height (SSH) and oceanic heat content (OHC) during this period in the MH region. Mixed layer heat budget analysis reveals the dominant role of heat advection in the observed warming trend. During the GWH period, stronger zonal currents advect the warm waters from the Western Pacific (WP) towards the MH region via the Indonesian Throughflow (ITF). This warming in the MH reduces the sea level pressure therein and establishes a weak pressure gradient between the MH and the northern hemisphere landmass. This in-turn weakens the cross-equatorial winds in the western Indian Ocean.Vidya P.J.M. RavichandranM. P. SubeeshSourav ChatterjeeNuncio M.Nature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Vidya P.J. M. Ravichandran M. P. Subeesh Sourav Chatterjee Nuncio M. Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean
description	Abstract The Mascarene High (MH) is a semi-permanent subtropical high-pressure zone in the South Indian Ocean. Apart from its large influence on African and Australian weather patterns, it also helps in driving the inter-hemispheric circulation between the Indian Ocean in the south and subcontinental landmass in the north. Using observations and reanalysis products, this study for the first time investigates recent warming trend observed in the MH region during the Global Warming Hiatus (GWH) period (1998–2016). Significant positive trends are observed in sea surface temperature (SST), sea surface height (SSH) and oceanic heat content (OHC) during this period in the MH region. Mixed layer heat budget analysis reveals the dominant role of heat advection in the observed warming trend. During the GWH period, stronger zonal currents advect the warm waters from the Western Pacific (WP) towards the MH region via the Indonesian Throughflow (ITF). This warming in the MH reduces the sea level pressure therein and establishes a weak pressure gradient between the MH and the northern hemisphere landmass. This in-turn weakens the cross-equatorial winds in the western Indian Ocean.
format	article
author	Vidya P.J. M. Ravichandran M. P. Subeesh Sourav Chatterjee Nuncio M.
author_facet	Vidya P.J. M. Ravichandran M. P. Subeesh Sourav Chatterjee Nuncio M.
author_sort	Vidya P.J.
title	Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean
title_short	Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean
title_full	Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean
title_fullStr	Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean
title_full_unstemmed	Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean
title_sort	global warming hiatus contributed weakening of the mascarene high in the southern indian ocean
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/9071f998550e4572a5cfcd8f1fff2aa2
work_keys_str_mv	AT vidyapj globalwarminghiatuscontributedweakeningofthemascarenehighinthesouthernindianocean AT mravichandran globalwarminghiatuscontributedweakeningofthemascarenehighinthesouthernindianocean AT mpsubeesh globalwarminghiatuscontributedweakeningofthemascarenehighinthesouthernindianocean AT souravchatterjee globalwarminghiatuscontributedweakeningofthemascarenehighinthesouthernindianocean AT nunciom globalwarminghiatuscontributedweakeningofthemascarenehighinthesouthernindianocean
_version_	1718391265981104128

Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean

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