Abstract

South Asian monsoon low-pressure systems (LPSs) are synoptic-scale cyclonic vortices that produce substantial precipitation over the Indian subcontinent. In this study, a catalogue of four regional varieties of LPSs, which occur during June–September 1979–2018, is used for 4 examining the track statistics, thermal and moisture structure, and precipitation contribution of each variety. The modulation of LPS activity by tropical intraseasonal variability, which is commonly monitored by the Boreal Summer Intraseasonal Oscillation, Monsoon Intraseasonal Oscillation and Madden-Julian Oscillation indices, is investigated.

Highlights

  • The Indian subcontinent is affected by synoptic-scale cyclonic vortices each summer monsoon season (June–September)

  • All low-pressure systems (LPSs) varieties can form throughout the summer monsoon season; the frequency of Bay of Bengal (BoB)-short as well as BoB-long LPSs is larger in July and August than in June and September, in agreement with Krishnamurthy and Ajayamohan (2010)

  • Bay of Bengal and adjoining eastern India. dicted on the sub-seasonal time scale. They cause more than 40% of the seasonal Fu et al, 2007), a better understanding of phases 1–2, when convection is over the precipitation over this region and 10–30% the intraseasonal oscillation (ISO)-LPS relationship can help in provid- Indian Ocean and adjoining parts of eastern of the seasonal precipitation over parts of ing useful LPS forecasts with lead times of Africa

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Summary

Open Access

ORCID: https://orcid.org/0000-0002-06426876 (2021) The four varieties of South Asian monsoon lowpressure systems and their modulation by tropical intraseasonal variability. It is advisable to refer to the publisher’s version if you intend to cite from the work. All outputs in CentAUR are protected by Intellectual Property Rights law, including copyright law. Copyright and IPR is retained by the creators or other copyright holders. Terms and conditions for use of this material are defined in the End User Agreement

CentAUR Central Archive at the University of Reading
Introduction
Data and methods
LPS catalogue
Tropical Rainfall Measuring Mission
Significance testing
Frequency and track characteristics
Track density
Sri Lankan
Vertical structure of temperature and moisture
Precipitation contribution
Vertical structure
Modulation of LPSs by the ISO
Supporting Information
Findings
Autonomous vehicles
Full Text
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