scholarly journals Intraseasonal variability in the South American monsoon system

2011 ◽  
Vol 12 (3) ◽  
pp. 253-260 ◽  
Author(s):  
Solange Aragão Ferreira ◽  
Manoel Alonso Gan
Keyword(s):  
Intraseasonal Variability ◽  
South American ◽  
The South ◽  
South American Monsoon ◽  
Monsoon System ◽  
South American Monsoon System

scholarly journals Insolation and Greenhouse Gas Forcing of the South American Monsoon System Across Three Glacial‐Interglacial Cycles

2020 ◽  
Vol 47 (14) ◽  
Author(s):  
Alicia Hou ◽  
André Bahr ◽  
Jacek Raddatz ◽  
Silke Voigt ◽  
Markus Greule ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
South American ◽  
The South ◽  
South American Monsoon ◽  
Monsoon System ◽  
South American Monsoon System

scholarly journals Late Quaternary Variations in the South American Monsoon System as Inferred by Speleothems—New Perspectives using the SISAL Database

Quaternary ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 6 ◽  
Author(s):  
Michael Deininger ◽  
Brittany Marie Ward ◽  
Valdir F. Novello ◽  
Francisco W. Cruz
Keyword(s):  
South America ◽  
Late Quaternary ◽  
Precipitation Amount ◽  
Ice Age ◽  
Convergence Zone ◽  
South American ◽  
The South ◽  
South American Monsoon ◽  
Monsoon System ◽  
South American Monsoon System

Here we present an overview of speleothem δ18O records from South America, most of which are available in the Speleothem Isotopes Synthesis and Analysis (SISAL_v1) database. South American tropical and subtropical speleothem δ18O time series are primarily interpreted to reflect changes in precipitation amount, the amount effect, and consequently history of convection intensity variability of convergence zones such as the Intertropical Convergence Zone (ITCZ) and the South America Monsoon System (SAMS). We investigate past hydroclimate scenarios in South America related to the South American Monsoon System in three different time periods: Late Pleistocene, Holocene, and the last two millennia. Precession driven summertime insolation is the main driver of convective variability over the continent during the last 120 kyrs (from present day to 120 kyrs BP), including the Holocene. However, there is a dipole between speleothem δ18O records from western and eastern South America. Records located in the central region of Brazil are weakly affected by insolation-driven variability, and instead are more susceptible to the variability associated with the South Atlantic Convergence Zone (SACZ). Cold episodic events in the Northern Hemisphere, such as Heinrich and Bond Events, and the Little Ice Age, increase the convective activity of the SAMS, resulting in increased precipitation amount in South America.

scholarly journals Complex networks identify spatial patterns of extreme rainfall events of the South American Monsoon System

2013 ◽  
Vol 40 (16) ◽  
pp. 4386-4392 ◽  
Author(s):  
Niklas Boers ◽  
Bodo Bookhagen ◽  
Norbert Marwan ◽  
Jürgen Kurths ◽  
José Marengo
Keyword(s):  
Complex Networks ◽  
Spatial Patterns ◽  
Extreme Rainfall ◽  
South American ◽  
The South ◽  
Extreme Rainfall Events ◽  
Rainfall Events ◽  
South American Monsoon ◽  
Monsoon System ◽  
South American Monsoon System

Moisture and heat budgets of the south American monsoon system: climatological aspects

2016 ◽  
Vol 130 (1-2) ◽  
pp. 233-247
Author(s):  
Sâmia R. Garcia ◽  
Mary T. Kayano ◽  
Alan J. P. Calheiros ◽  
Rita Valéria Andreoli ◽  
Rodrigo Augusto Ferreira de Souza
Keyword(s):  
South American ◽  
The South ◽  
South American Monsoon ◽  
Monsoon System ◽  
South American Monsoon System ◽  
Heat Budgets

scholarly journals Forecast Skill of the South American Monsoon System

2012 ◽  
Vol 25 (6) ◽  
pp. 1883-1889 ◽  
Author(s):  
Charles Jones ◽  
Leila M. V. Carvalho ◽  
Brant Liebmann
Keyword(s):  
South American ◽  
The South ◽  
South American Monsoon ◽  
Simple Index ◽  
Climatic Feature ◽  
Probabilistic Forecasts ◽  
Monsoon System ◽  
South American Monsoon System ◽  
Environmental Prediction ◽  
Mean Square Errors

Abstract The South American monsoon system (SAMS) is the most important climatic feature in South America and is characterized by pronounced seasonality in precipitation. This study uses the National Centers for Environmental Prediction Climate Forecast System, reforecasts version 2 (CFSRv2), to investigate the skill of probabilistic forecasts of onset and demise dates, duration, and amplitude of SAMS during 1982–2009. A simple index based on the empirical orthogonal function of precipitation anomalies is employed to characterize onsets, demises, durations, and amplitudes of SAMS. The CFSv2 model has useful skill to forecast seasonal changes in SAMS. Probabilistic forecasts of onset and demise dates have 16.5% and 43.3% improvements, respectively, over climatological forecasts. Verification of hindcasts of durations and amplitudes of SAMS shows relatively small biases and root-mean-square errors.

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