Dynamical links of convective storms associated with tropospheric biennial oscillation in the Indian monsoon regime
Abstract Tropospheric Biennial Oscillation (TBO) is characterized by a tendency for a relatively stronger monsoon to be followed by a relatively weaker one (positive) or vice-versa (negative). This study examines the distribution of different convective systems occurring during TBO phases over the I...
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| Formaat: | Artikel |
| Taal: | English |
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Nature Portfolio
2022-07-01
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| Reeks: | Scientific Reports |
| Online toegang: | https://doi.org/10.1038/s41598-022-15772-9 |
| _version_ | 1828543811900407808 |
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| author | U. V. Murali Krishna Subrata Kumar Das K. N. Uma Abhishek Kumar Jha G. Pandithurai |
| author_facet | U. V. Murali Krishna Subrata Kumar Das K. N. Uma Abhishek Kumar Jha G. Pandithurai |
| author_sort | U. V. Murali Krishna |
| collection | DOAJ |
| description | Abstract Tropospheric Biennial Oscillation (TBO) is characterized by a tendency for a relatively stronger monsoon to be followed by a relatively weaker one (positive) or vice-versa (negative). This study examines the distribution of different convective systems occurring during TBO phases over the Indian monsoon region. During negative TBO phase, convection is preferential over the Arabian Sea (AS), whereas during positive TBO phase, it is favoured over the land areas and Bay of Bengal (BoB). The isolated shallow convection (ISC) is dominated over the AS and Indian west coast during negative TBO years. A relatively stable environment (statically) capped with drier mid-troposphere results in abundant ISC over the AS. Broad stratiform rain (BSR) dominates over the central and east coast of India, BoB and Myanmar coast during positive TBO years and wide convective core (WCC) are present along the orographic regions, i.e., Myanmar coast and Western Ghats during negative TBO phase. The anomalous easterlies induced by the upper-ocean temperature gradient interact with the mean monsoon winds during positive TBO to provide pathways for developing BSR echoes. The deep-wide convection (DWC) are higher along the Himalayan foothills during positive TBO years. The moist low-level flow from the AS is trapped by dry mid-level flow from high latitudes, resulting in orographic lifting along the Himalayan foothills and form DWC. |
| first_indexed | 2024-12-12T02:20:15Z |
| format | Article |
| id | doaj.art-601bacf2ec3c4c43b51bfccfe3a1a51c |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-12T02:20:15Z |
| publishDate | 2022-07-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj.art-601bacf2ec3c4c43b51bfccfe3a1a51c2022-12-22T00:41:42ZengNature PortfolioScientific Reports2045-23222022-07-0112111110.1038/s41598-022-15772-9Dynamical links of convective storms associated with tropospheric biennial oscillation in the Indian monsoon regimeU. V. Murali Krishna0Subrata Kumar Das1K. N. Uma2Abhishek Kumar Jha3G. Pandithurai4Indian Institute of Tropical Meteorology, Ministry of Earth SciencesIndian Institute of Tropical Meteorology, Ministry of Earth SciencesSpace Physics Laboratory, Vikram Sarabhai Space CentreIndian Institute of Tropical Meteorology, Ministry of Earth SciencesIndian Institute of Tropical Meteorology, Ministry of Earth SciencesAbstract Tropospheric Biennial Oscillation (TBO) is characterized by a tendency for a relatively stronger monsoon to be followed by a relatively weaker one (positive) or vice-versa (negative). This study examines the distribution of different convective systems occurring during TBO phases over the Indian monsoon region. During negative TBO phase, convection is preferential over the Arabian Sea (AS), whereas during positive TBO phase, it is favoured over the land areas and Bay of Bengal (BoB). The isolated shallow convection (ISC) is dominated over the AS and Indian west coast during negative TBO years. A relatively stable environment (statically) capped with drier mid-troposphere results in abundant ISC over the AS. Broad stratiform rain (BSR) dominates over the central and east coast of India, BoB and Myanmar coast during positive TBO years and wide convective core (WCC) are present along the orographic regions, i.e., Myanmar coast and Western Ghats during negative TBO phase. The anomalous easterlies induced by the upper-ocean temperature gradient interact with the mean monsoon winds during positive TBO to provide pathways for developing BSR echoes. The deep-wide convection (DWC) are higher along the Himalayan foothills during positive TBO years. The moist low-level flow from the AS is trapped by dry mid-level flow from high latitudes, resulting in orographic lifting along the Himalayan foothills and form DWC.https://doi.org/10.1038/s41598-022-15772-9 |
| spellingShingle | U. V. Murali Krishna Subrata Kumar Das K. N. Uma Abhishek Kumar Jha G. Pandithurai Dynamical links of convective storms associated with tropospheric biennial oscillation in the Indian monsoon regime Scientific Reports |
| title | Dynamical links of convective storms associated with tropospheric biennial oscillation in the Indian monsoon regime |
| title_full | Dynamical links of convective storms associated with tropospheric biennial oscillation in the Indian monsoon regime |
| title_fullStr | Dynamical links of convective storms associated with tropospheric biennial oscillation in the Indian monsoon regime |
| title_full_unstemmed | Dynamical links of convective storms associated with tropospheric biennial oscillation in the Indian monsoon regime |
| title_short | Dynamical links of convective storms associated with tropospheric biennial oscillation in the Indian monsoon regime |
| title_sort | dynamical links of convective storms associated with tropospheric biennial oscillation in the indian monsoon regime |
| url | https://doi.org/10.1038/s41598-022-15772-9 |
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