Unusual circulation pattern during Indian summer monsoon failure in July 2002 and June 2009

2012 ◽  
Vol 65 (1) ◽  
pp. 295-302 ◽  
Author(s):  
Dhrubajyoti Samanta ◽  
Mihir Kumar Dash ◽  
Prem Chand Pandey
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Circulation Pattern ◽  
Monsoon Failure

Extratropical anticyclonic Rossby wave breaking and Indian summer monsoon failure

2015 ◽  
Vol 46 (5-6) ◽  
pp. 1547-1562 ◽  
Author(s):  
Dhrubajyoti Samanta ◽  
M. K. Dash ◽  
B. N. Goswami ◽  
P. C. Pandey
Keyword(s):  
Summer Monsoon ◽  
Rossby Wave ◽  
Indian Summer Monsoon ◽  
Wave Breaking ◽  
Rossby Wave Breaking ◽  
Monsoon Failure

scholarly journals Internal Feedbacks from Monsoon–Midlatitude Interactions during Droughts in the Indian Summer Monsoon

2009 ◽  
Vol 66 (3) ◽  
pp. 553-578 ◽  
Author(s):  
R. Krishnan ◽  
Vinay Kumar ◽  
M. Sugi ◽  
J. Yoshimura
Keyword(s):  
East Asia ◽  
Central Asia ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Large Scale ◽  
Far East ◽  
Circulation Pattern ◽  
Wave Dispersion ◽  
Upper Troposphere ◽  
West Central

Abstract Results from a 20-yr simulation of a high-resolution AGCM forced with climatological SST, along with simplified model experiments and supplementary data diagnostics, are used to investigate internal feedbacks arising from monsoon–midlatitude interactions during droughts in the Indian summer monsoon. The AGCM simulation not only shows a fairly realistic mean monsoon rainfall distribution and large-scale circulation features but also exhibits remarkable interannual variations of precipitation over the subcontinent, with the 20-yr run showing incidence of four “monsoon droughts.” The present findings indicate that the internally forced droughts in the AGCM emanate largely from prolonged “monsoon breaks” that occur on subseasonal time scales and involve dynamical feedbacks between monsoon convection and extratropical circulation anomalies. In this feedback, the suppressed monsoon convection is shown to induce Rossby wave dispersion in the summertime subtropical westerlies and to set up an anomalous quasi-stationary circulation pattern extending across continental Eurasia in the middle and upper troposphere. This pattern is composed of a cyclonic anomaly over west central Asia and the Indo-Pakistan region, a meridionally deep anticyclonic anomaly over East Asia (∼100°E), and a cyclonic anomaly over the Far East. The results suggest that the anchoring of the west central Asia cyclonic anomaly by the stagnant ridge located downstream over East Asia induces anomalous cooling in the middle and upper troposphere through cold-air advection, which reduces the meridional thermal contrast over the subcontinent. Additionally, the intrusion of the dry extratropical winds into northwest India can decrease the convective instability, so that the suppressed convection can in turn weaken the monsoon flow. The sustenance of monsoon breaks through such monsoon–midlatitude feedbacks can generate droughtlike conditions over India.

Pacific Ocean origin for the 2009 Indian summer monsoon failure

2010 ◽  
Vol 37 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. Venkata Ratnam ◽  
Swadhin K. Behera ◽  
Y. Masumoto ◽  
K. Takahashi ◽  
T. Yamagata
Keyword(s):  
Pacific Ocean ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Monsoon Failure

VARIABILITY IN THE INDIAN SUMMER MONSOON PRECIPITATION AND LAKE LEVELS IN EASTERN TIBET

2016 ◽  
Author(s):  
Melanie Perello ◽  
◽  
Broxton W. Bird ◽  
Yanbin Lei ◽  
Pratigya J. Polissar ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Monsoon Precipitation ◽  
Lake Levels ◽  
Eastern Tibet

scholarly journals Tectonic and climatic drivers of Asian monsoon evolution

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
James R. Thomson ◽  
Philip B. Holden ◽  
Pallavi Anand ◽  
Neil R. Edwards ◽  
Cécile A. Porchier ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Asian Monsoon ◽  
Monsoon Rainfall ◽  
East Asian Monsoon ◽  
East Asian ◽  
Meridional Overturning Circulation ◽  
Great Debate ◽  
Climatic Drivers ◽  
Meridional Overturning

AbstractAsian Monsoon rainfall supports the livelihood of billions of people, yet the relative importance of different drivers remains an issue of great debate. Here, we present 30 million-year model-based reconstructions of Indian summer monsoon and South East Asian monsoon rainfall at millennial resolution. We show that precession is the dominant direct driver of orbital variability, although variability on obliquity timescales is driven through the ice sheets. Orographic development dominated the evolution of the South East Asian monsoon, but Indian summer monsoon evolution involved a complex mix of contributions from orography (39%), precession (25%), atmospheric CO2 (21%), ice-sheet state (5%) and ocean gateways (5%). Prior to 15 Ma, the Indian summer monsoon was broadly stable, albeit with substantial orbital variability. From 15 Ma to 5 Ma, strengthening was driven by a combination of orography and glaciation, while closure of the Panama gateway provided the prerequisite for the modern Indian summer monsoon state through a strengthened Atlantic meridional overturning circulation.

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