Relationship between Azores High and Indian summer monsoon

Relationship between Azores High and Indian summer monsoon

Abstract A dominant mode of interannual variability of Indian summer monsoon rainfall shows west-east dipole pattern with above normal rainfall towards west and central India and subdued rainfall towards the east and northeast India, and is related to the vigorous Azores High. The vigorous Azores Hi...

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Main Author: Ramesh Kumar Yadav
Format: article
Language:EN
Published: Nature Portfolio 2021
Subjects:
Environmental sciences
GE1-350
Meteorology. Climatology
QC851-999
Online Access:https://doaj.org/article/435f46e054674f3ebc60f15dfa69fecf
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spelling oai:doaj.org-article:435f46e054674f3ebc60f15dfa69fecf2021-12-02T13:40:57ZRelationship between Azores High and Indian summer monsoon10.1038/s41612-021-00180-z2397-3722https://doaj.org/article/435f46e054674f3ebc60f15dfa69fecf2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41612-021-00180-zhttps://doaj.org/toc/2397-3722Abstract A dominant mode of interannual variability of Indian summer monsoon rainfall shows west-east dipole pattern with above normal rainfall towards west and central India and subdued rainfall towards the east and northeast India, and is related to the vigorous Azores High. The vigorous Azores High is accompanied by enhanced subsidence resulting in well-built widespread upper-troposphere convergence. This forms the meridional vorticity dipole consisting of anomalous cyclonic and anti-cyclonic circulation at 30°N and 50°N, respectively, and boosts the Rossby wave source. The cascading down Rossby wave train imposes successive negative, positive and negative Geopotential height (GPH) anomalies over north Mediterranean, northwest and northeast of India, respectively. The negative GPH anomaly at the north Mediterranean increases the Asian jet towards the Caspian Sea, strengthening the monsoon circulation through the ‘silk-road’ pattern. While, the dipole GPH anomaly north of India shift the Tibetan High westwards, triggering monsoon activity towards the west.Ramesh Kumar YadavNature PortfolioarticleEnvironmental sciencesGE1-350Meteorology. ClimatologyQC851-999ENnpj Climate and Atmospheric Science, Vol 4, Iss 1, Pp 1-9 (2021)
institution DOAJ
collection DOAJ
language EN
topic Environmental sciences
GE1-350
Meteorology. Climatology
QC851-999
spellingShingle Environmental sciences
GE1-350
Meteorology. Climatology
QC851-999
Ramesh Kumar Yadav
Relationship between Azores High and Indian summer monsoon
description Abstract A dominant mode of interannual variability of Indian summer monsoon rainfall shows west-east dipole pattern with above normal rainfall towards west and central India and subdued rainfall towards the east and northeast India, and is related to the vigorous Azores High. The vigorous Azores High is accompanied by enhanced subsidence resulting in well-built widespread upper-troposphere convergence. This forms the meridional vorticity dipole consisting of anomalous cyclonic and anti-cyclonic circulation at 30°N and 50°N, respectively, and boosts the Rossby wave source. The cascading down Rossby wave train imposes successive negative, positive and negative Geopotential height (GPH) anomalies over north Mediterranean, northwest and northeast of India, respectively. The negative GPH anomaly at the north Mediterranean increases the Asian jet towards the Caspian Sea, strengthening the monsoon circulation through the ‘silk-road’ pattern. While, the dipole GPH anomaly north of India shift the Tibetan High westwards, triggering monsoon activity towards the west.
format article
author Ramesh Kumar Yadav
author_facet Ramesh Kumar Yadav
author_sort Ramesh Kumar Yadav
title Relationship between Azores High and Indian summer monsoon
title_short Relationship between Azores High and Indian summer monsoon
title_full Relationship between Azores High and Indian summer monsoon
title_fullStr Relationship between Azores High and Indian summer monsoon
title_full_unstemmed Relationship between Azores High and Indian summer monsoon
title_sort relationship between azores high and indian summer monsoon
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/435f46e054674f3ebc60f15dfa69fecf
work_keys_str_mv AT rameshkumaryadav relationshipbetweenazoreshighandindiansummermonsoon
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