Global warming hiatus contributed weakening of the Mascarene High in the Southern Indian Ocean
| Autor: | M. P. Subeesh, M. Nuncio, Sourav Chatterjee, Vidya P J, M. Ravichandran |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Mixed layer Science lcsh:Medicine Subtropics Global warming hiatus 010502 geochemistry & geophysics 01 natural sciences Article lcsh:Science 0105 earth and related environmental sciences Multidisciplinary Advection lcsh:R Northern Hemisphere Sea-surface height Sea surface temperature Ocean sciences Climatology Environmental science Medicine lcsh:Q Ocean heat content Climate sciences |
| Zdroj: | Scientific Reports Scientific Reports, Vol 10, Iss 1, Pp 1-9 (2020) |
| ISSN: | 2045-2322 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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