scholarly journals Solar activity as a potential factor for foreshadowing drought in Indian summer monsoon regime

MAUSAM ◽  
2021 ◽  
Vol 32 (3) ◽  
pp. 277-280
Author(s):  
A. CHOWDHURY ◽  
V. P. ABHYANKAR ◽  
M. V. PHADKE
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Correlation Analysis ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Chi Square ◽  
Peninsular India ◽  
Indian Rainfall ◽  
Potential Factor ◽  
Maximum Minimum

An attempt bas been made to determine Influence o solar activity on drought incidence in India, 100 year's rainfall (1875-1974) for northwest and peninsular India, have been analysed with respect to sunspot numbers and Baur's solar index and their distribution during drought years determined. Frequency of drought per cycle of solar activity have been obtained. Association between drought and maximum/minimum spottedness was tested by chi-square technique. Correlation have been computed between sunspots, Baur's index and rainfall during different phases of solar activity.   The results revealed that on an average drought occures once in a solar cycle. Occurrence of maxima or minima did not have any relationship with the drought, which was found to occur earlier as well as later than either of the epochs, Correlation analysis revealed that for the Peninsula, sunspots numbers and its values during middle of the waxing phase were significant. The Baur's index bears significant correlation with northwest Indian rainfall. It's value during the waxing phase as also during middle of waxing phase is also significantly correlated with northwest Indian rainfall. The index was significant for peninsula rainfall during middle of waxing phase.

scholarly journals Decadal Variations of the East Asian Summer Monsoon Forced by the 11-Year Insolation Cycle

2019 ◽  
Vol 32 (10) ◽  
pp. 2735-2745 ◽  
Author(s):  
Chunhan Jin ◽  
Jian Liu ◽  
Bin Wang ◽  
Mi Yan ◽  
Liang Ning
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Summer Monsoon ◽  
North Pacific ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Decadal Variation ◽  
Solar Forcing ◽  
Asian Summer

Statistical evidence suggests that solar activity may affect the atmospheric circulation over East Asia (EA), but the way in which the 11-yr solar radiation cycle affects the East Asian summer monsoon (EASM) remains unexplained. Based on one control experiment and four solar-only forcing experiments performed during the Community Earth System Model–Last Millennium Ensemble (CESM-LME) model project, we explore the potential impacts of the 11-yr solar cycle on EASM variability and the physical processes through which solar forcing influences EASM decadal variability. The model results show that the warm season [May–September (MJJAS)] mean precipitation over EA exhibits significant decadal variation with a “northern wet–southern dry” pattern during peak years in the strong 11-yr solar cycle epoch (AD 900–1285), which is in contrast to the absence of decadal signals during the weak 11-yr solar cycle epoch (AD 1400–1535). For the four-member ensemble averaged solar-only forcing experiment, the summer mean precipitation over northern EA is significantly correlated with the solar forcing ( r = 0.414, n = 68, p < 0.05) on a decadal time scale during the strong cycle epoch, whereas there is no statistical link between the EASM and solar activity during the weak cycle epoch ( r = 0.002, n = 24). A strong, 11-yr solar cycle is also shown to excite an anomalous sea surface temperature (SST) pattern that resembles a cool Pacific decadal oscillation (PDO) phase, which has a significant 11-yr periodicity. The associated anomalous North Pacific anticyclone dominates the entire extratropical North Pacific and enhances the southerly monsoon over EA, which results in abundant rainfall over northern EA. We argue that the 11-yr solar cycle affects the EASM decadal variation through excitation of a coupled decadal mode in the Asia–North Pacific region.

An assessment of the impact of Indian summer monsoon droughts on atmospheric aerosols and associated radiative forcing at a semi-arid station in peninsular India

2021 ◽  
pp. 152683
Author(s):  
Raja Obul Reddy Kalluri ◽  
Lokeswara Reddy Thotli ◽  
Balakrishnaiah Gugamsetty ◽  
Rama Gopal Kotalo ◽  
Bhavyasree Akkiraju ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Atmospheric Aerosols ◽  
Radiative Forcing ◽  
Peninsular India ◽  
The Impact ◽  
Semi Arid

Abrupt Holocene Indian Summer Monsoon failures: A primary response to solar activity?

The Holocene ◽  
2015 ◽  
Vol 25 (4) ◽  
pp. 677-685 ◽  
Author(s):  
Hai Xu ◽  
Kevin M Yeager ◽  
Jianghu Lan ◽  
Bin Liu ◽  
Enguo Sheng ◽  
...  
Keyword(s):  
Solar Activity ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Primary Response

Solar cycle effects on Indian summer monsoon dynamics

2014 ◽  
Vol 121 ◽  
pp. 145-156 ◽  
Author(s):  
M. Venkat Ratnam ◽  
Y. Durga Santhi ◽  
P. Kishore ◽  
S. Vijaya Bhaskara Rao
Keyword(s):  
Solar Cycle ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Monsoon Dynamics

Decadal- to centennial-scale climate changes over the last 2000 yr recorded from varved sediments of Lake Kusai, northern Qinghai-Tibetan Plateau

2019 ◽  
Vol 92 (2) ◽  
pp. 340-351 ◽  
Author(s):  
Weihan Jia ◽  
Xingqi Liu
Keyword(s):  
Solar Activity ◽  
Tibetan Plateau ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Climate Changes ◽  
Authigenic Carbonates ◽  
Temperature Changes ◽  
Effective Moisture ◽  
Scale Temperature ◽  
Varved Sediment

AbstractHigh-resolution climate archives of the Late Holocene are essential in the study of paleoclimatic dynamics and for understanding the importance of natural and anthropogenic influences on past and future climate changes. Here, we present well-dated X-ray fluorescence scanning records retrieved from a varved sediment core from Lake Kusai. These records show the decadal- to centennial-scale paleoclimatic variability of the northern Qinghai-Tibetan Plateau over the last 2000 yr. Ca is mainly related to the precipitation of authigenic carbonates and is a proxy for temperature changes. The Ca record of Lake Kusai is well-correlated with the variations and periodicities of solar activity. Therefore, solar output can be suggested as being the predominant forcing mechanism of decadal- to centennial-scale temperature fluctuations over the last 2000 yr. The evolution of effective moisture was inferred from the log-ratios of Rb/Sr, which demonstrated synchronous changes with the typical Indian summer monsoon record from Dongge Cave. These results indicate that the decadal- to centennial-scale effective moisture evolution of the northern Qinghai-Tibetan Plateau is mainly influenced by the Indian summer monsoon. Additionally, we have not found the evident periodicities of solar activity in our effective moisture record over the last 2000 yr.

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