Past monsoon rainfall variations in peninsular India recorded in a 331-year-old speleothem

The Holocene ◽  
2004 ◽  
Vol 14 (4) ◽  
pp. 517-524 ◽  
Author(s):  
M. G. Yadava ◽  
R. Ramesh ◽  
G. B. Pant
Keyword(s):  
Monsoon Rainfall ◽  
Peninsular India ◽  
Rainfall Variations

Indian Monsoon Rainfall Variability and associated Climatic forcings in the last two millennia inferred by a Stalagmite from the peninsular India

2020 ◽  
Author(s):  
Naveen Gandhi ◽  
Phannindra Reddy A. ◽  
Raghavan Krishnan ◽  
Madhusudan G. Yadava
Keyword(s):  
Little Ice Age ◽  
Monsoon Rainfall ◽  
Southern Oscillation ◽  
Indian Subcontinent ◽  
Rainfall Variability ◽  
Warm Period ◽  
Ice Age ◽  
Peninsular India ◽  
Rainfall Variations ◽  
The Last Two Millennia

<p>We present high temporal (near-annually) resolved δ<sup>18</sup>O values from absolutely dated stalagmite record that represents the Indian Summer Monsoon (ISM) rainfall variations for the Indian subcontinent spanning from 207 AD to 2014 AD. This rainfall reconstruction shows ISM varaitions for four major global climatic periods viz., Roman Warm Period (RWP), Dark Ages Cold Period (DACP), Medieval Warm Period (MWP) and Little Ice Age (LIA). Cave records from different patrs of the sub-continent synchronously show enhanced precipitation during DACP. This wet period was forced by Solar-induced El-NiNo Southern Oscillation (ENSO) and Tibetan Plateau Temperature. Cliamtic conditions were wetter during LIA than that during MWP, as the former witnessed more number of wet monsoon years. However, MWP witnessed the strongest and the weakest monsoon years in the last two millennia. The direct influence of Soalr activity on the position of Inter Tropical Convergance zone (ITCZ) might have caused the observed ISM variability of MWP. Altough ISM shows largest variability during MWP, the overall monsoon state was moving towards wetter conditions, forced by ENSO. Solar induced forcings on ENSO influenced ISM during LIA. Our results suggest of non-stationary dynamical forcings over ISM during different periods in the last two millennia.</p>

On the Predictability of Northeast Monsoon Rainfall over South Peninsular India in General Circulation Models

2013 ◽  
Vol 170 (11) ◽  
pp. 1945-1967 ◽  
Author(s):  
Archana Nair ◽  
Nachiketa Acharya ◽  
Ankita Singh ◽  
U. C. Mohanty ◽  
T. C. Panda
Keyword(s):  
General Circulation ◽  
Monsoon Rainfall ◽  
General Circulation Models ◽  
Northeast Monsoon ◽  
Peninsular India ◽  
Northeast Monsoon Rainfall

Solar Activity Changes During Prolonged Sunspot Minima as Inferred from Indian Monsoon Rainfall Variations

2018 ◽  
Vol 13 (S340) ◽  
pp. 209-210
Author(s):  
S. Ambily ◽  
V. G. Haritha ◽  
C. Sunil Kumar Morais ◽  
T. E. Girish
Keyword(s):  
Solar Activity ◽  
Monsoon Rainfall ◽  
Indian Monsoon ◽  
Maunder Minimum ◽  
Sunspot Activity ◽  
Indian Monsoon Rainfall ◽  
Quadrupole Field ◽  
Rainfall Variations ◽  
Extreme North ◽  
South Asymmetry

AbstractWe could find a new 5 year periodicity in the occurrences of peaks in sunspot activity and inferred deviations of annual Indian monsoon rainfall variations from the normal during the Maunder minimum (MM) period. This result is explained in terms of solar dynamo functioning in a different mode from normal during the MM where quadrupole field (first harmonic, 5-5.5 years) dominate over dipole field (fundamental, 11 years) causing extreme north south asymmetry in sunspot activity.

Intraseasonal and Seasonally Persisting Patterns of Indian Monsoon Rainfall

2007 ◽  
Vol 20 (1) ◽  
pp. 3-20 ◽  
Author(s):  
V. Krishnamurthy ◽  
J. Shukla
Keyword(s):  
Monsoon Rainfall ◽  
Indian Monsoon ◽  
Singular Spectrum Analysis ◽  
Daily Rainfall ◽  
Central India ◽  
North India ◽  
Peninsular India ◽  
Rainfall Analysis ◽  
Intraseasonal Oscillations ◽  
Rainfall Anomalies

Abstract The space–time structure of the active and break periods of the Indian monsoon has been studied using 70-yr-long high-resolution gridded daily rainfall data over India. The analysis of lagged composites of rainfall anomalies based on an objective categorization of active and break phases shows that the active (break) cycle, with an average life of 16 days, starts with positive (negative) rainfall anomalies over the Western Ghats and eastern part of central India and intensifies and expands to a region covering central India and parts of north India during the peak phase, while negative (positive) anomalies cover the sub-Himalayan region and southeast India. During the final stage of the active (break) period, the positive (negative) rainfall anomalies move toward the foothills of the Himalayas while peninsular India is covered with opposite sign anomalies. The number of days on which lows and depressions are present in the region during active and break periods is consistent with the rainfall analysis. The number of depressions during the active phase is about 7 times that during the break phase. Using multichannel singular spectrum analysis of the daily rainfall anomalies, the seasonal monsoon rainfall is found to consist of two dominant intraseasonal oscillations with periods of 45 and 20 days and three seasonally persisting components. The 45- and 20-day oscillations are manifestations of the active and break periods but contribute very little to the seasonal mean rainfall. The seasonally persisting components with anomalies of the same sign, and covering all of India, have a very high interannual correlation with the total seasonal mean rainfall. These results support a conceptual model of the interannual variability of the monsoon rainfall consisting of seasonal mean components and a statistical average of the intraseasonal variations. The success in the prediction of seasonal mean rainfall depends on the relative strengths of the seasonally persisting components and intraseasonal oscillations.

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