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Sunday, July 19, 2020 | History

1 edition of Active and break spells of the Indian summer monsoon found in the catalog.

Active and break spells of the Indian summer monsoon

M. Rajeevan

Active and break spells of the Indian summer monsoon

by M. Rajeevan

  • 221 Want to read
  • 40 Currently reading

Published by National Climate Centre, Office of the Additional Director General of Meteorology (Research), India Meteorological Dept. in Pune .
Written in English


Edition Notes

StatementM. Rajeevan, Sulochana Gadgil, and Jyoti Bhate
SeriesNCC research report
ContributionsGadgil, Sulochana, Bhate, Jyoti, National Climate Centre (India)
The Physical Object
Pagination44 p. :
Number of Pages44
ID Numbers
Open LibraryOL24805035M
LC Control Number2010347697

Changes to the behaviour of subseasonal precipitation extremes and active‐break cycles of the Indian summer monsoon are assessed in this study using pre‐industrial and 2 × CO 2 integrations of the Hadley Centre coupled model HadCM3, which is able to simulate the monsoon . INTRODUCTION. Seasonal and Extended Range Prediction group of IITM has been providing experimental real-time forecast of the active-break spells of Indian Summer Monsoon Rainfall since up to 4 pentad lead using an indigenously developed Ensemble Prediction system (EPS) based on the state-of-the-art Climate Forecast System Model Version 2 (CFSv2).

Simulated changes in active/break spells during the Indian summer monsoon due to enhanced CO2 concentrations: assessment from selected coupled atmosphere–ocean global climate models Sujata K. Mandke,* A. K. Sahai, M. A. Shinde, Susmitha Joseph and R. Chattopadhyay.   In the present chapter, the terms “wet” and “dry” spells are used instead of active and break spells, in order to avoid confusion with all-India active and break spells of the summer monsoon rainfall. The method of analysis for the identification of wet and dry spells is discussed below.

  Turner, A. G. & Slingo, J. M. Subseasonal extremes of precipitation and active-break cycles of the Indian summer monsoon in a climate-change scenario. Quart. J. Extended range prediction of active-break spells in mon- soon over India 2–3 weeks in advance is not only crucial for agriculture planning especially sowing, harvesting, irrigation and water management but it .


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Active and break spells of the Indian summer monsoon by M. Rajeevan Download PDF EPUB FB2

Active and break spells of the Indian summer monsoon M Rajeevan1,∗, Sulochana Gadgil2 and Jyoti Bhate1 1National Atmospheric Research Laboratory, GadankiAndhra Pradesh, India. 2Centre. Active and break spells of the Indian summer monsoon Article (PDF Available) in Journal of Earth System Science (3) June with 2, Reads How we measure 'reads'.

(PDF) Active and break spells of the Indian summer monsoon | Jyoti Bhate - In this paper, we suggest criteria for the identification of active and break events of the Indian summer monsoon on the basis of recently derived high resolution daily gridded rainfall dataset over India (–).

Active and break events are. Active and Break Spells of the Indian Summer Monsoon M. Rajeevan. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Sub-seasonal rainfall fluctuations, characterized as active and weak spells during the Indian monsoon season (June to September) is an important component of the variability of the Indian monsoon rainfall.

In this paper, we suggest criteria for identification of active and break events of the Indian summer monsoon on. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): In this paper, we suggest criteria for the identification of active and break events of the Indian summer monsoon on the basis of recently derived high resolution daily gridded rainfall dataset over India (–).

Active and break events are defined as periods during the peak monsoon months of July and August. In this paper, we suggest criteria for the identification of active and break events of the Indian summer monsoon on the basis of recently derived high resolution daily gridded rainfall dataset over India ().

Active and break events are defined as periods during the peak monsoon months of July and August, in which the normalized anomaly of the rainfall over a critical area, called the. In this paper, we suggest criteria for the identification of active and break events of the Indian summer monsoon on the basis of recently derived high resolution daily gridded rainfall dataset over India (–).

Active and break events are defined as periods during the peak monsoon months of July and August, in which the normalized anomaly of the rainfall over a critical area, called. Active-weak spells and breaks in the monsoon - Part 1 Active-weak spells and breaks in the monsoon - Part2 Intraseasonal variation and intraseasonal oscillations.

The study explores the role of ice-phase microphysics and convection for the better simulation of Indian summer monsoon rainfall (ISMR) and monsoon intraseasonal oscillation (MISO).

Sensitivity experiments have been performed with coupled climate model- CFSv2 using different microphysics (with and without ice phase processes) and convective [Simple Arakawa Schubert (SAS), new SAS (NSAS. Climatological characteristics of precipitation during the active and break spells of the monsoon are studied using 15 years of TRMM measurements.

The spatial variation of rain fraction suggests that most of the seasonal rainfall occurs in spells of active monsoon over India. The criteria suggested here can be used to monitor the active and break events of the Indian summer monsoon on a real time basis.

On an average, there are 7 days of active and break events during the period July and August. Breaks tend to have a longer life-span than active spells. Active-break cycle is the most important intraseasonal variability of the southwest monsoon ().In the current study, classification of active and break days during the southwest monsoon period is made based on the criteria suggested by Joseph and Sijikumar ().They classified active and break spells based on hPa zonal wind speed over the region 10°N–20°N; 70°E–80°E.

South Asia is home to about 24% of the world's population and is one of the world's most disaster prone regions. The majority of the people in this region depend on agriculture for their livelihood. Substantial variability in the South Asian Summer Monsoon occurs on an intraseasonal timescale ( day) during which it fluctuates between spells of heavy (active spells) and low rainfall.

This paper describes a novel simulation of active and break spells of the Indian summer monsoon (ISM) using a relatively high-resolution regional coupled ocean–atmosphere climate model (RCM) run at km grid spacing. Active and Break Spells of the Indian Summer - Free download as Powerpoint Presentation .ppt /.pptx), PDF File .pdf), Text File .txt) or view presentation slides online.

meteorology. •The break (active) spell has been identified as the period during which the standardized rainfall anomaly is less than – (more than +), consecutively for three days or more. Objectives •To identify objective criteria for identification of active and break spells of Indian summer monsoon.

Abstract. For over a century, the term break has been used for spells in which the rainfall over the Indian monsoon zone is interrupted. The phenomenon of 'break monsoon' is of gr. [1] Indian summer monsoon exhibits significant intra-seasonal variations with active and break monsoon spells.

Using MODIS data of 8 years (–), variations of cloud and aerosol properties over the Indian region associated with the active and break spells were examined. The study shows statistically significant variations of cloud. Using the insight gained from nonlinear dynamical system theory Dwivedi et al.

[] developed an empirical rule for the extended range prediction of duration of Indian summer monsoon breaks. Dwivedi and Mittal [] forecasted the duration of active and break spells in Intrinsic Mode Functions of ISOs.

We find that breaks tend to have a longer life-span than active spells. While, almost 80% of the active spells lasted 3–4 days, only 40% of the break spells were of such short duration. A small fraction (9%) of active spells and 32% of break spells lasted for a week or longer.[1] Indian summer monsoon exhibits significant intra‐seasonal variations with active and break monsoon spells.

Using MODIS data of 8 years (–), variations of cloud and aerosol properties over the Indian region associated with the active and break spells were examined. Improvement in the estimation of active and break spells in CMIP6 models can be linked with the better predictability and representation of MJO which is strongly related to the onset of active and break spells during ISMR (Pai et al., ).

The recent changes in intra-seasonal variability for historical monsoon period is also computed for.