The South American Monsoon System: Climatology and Variability

  • S. Silva V
  • E. V
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Abstract

Climatology, the study of climate, is no longer regarded as a single discipline that treats climate as something that fluctuates only within the unchanging boundaries described by historical statistics. The field has recognized that climate is something that changes continually under the influence of physical and biological forces and so, cannot be understood in isolation but rather, is one that includes diverse scientific disciplines that play their role in understanding a highly complex coupled "whole system" that is the earth's climate. The modern era of climatology is echoed in this book. On the one hand it offers a broad synoptic perspective but also considers the regional standpoint, as it is this that affects what people need from climatology. Aspects on the topic of climate change - what is often considered a contradiction in terms - is also addressed. It is all too evident these days that what recent work in climatology has revealed carries profound implications for economic and social policy; it is with these in mind that the final chapters consider acumens as to the application of what has been learned to date.

Figures

  • Fig. 1. South American key topographic features and major river basins [Amazon basin (light yellow), Sao Francisco basin (light green) and La Plata basin (light blue)]. The Brazilian "Planalto" (BP) is indicated by the red oval.
  • Fig. 2. Mean 850-hPa wind direction (vectors) and magnitude (shading, ms-1) taken from six reanalysis data sets for December-February 1979-2000.
  • Fig. 3. Mean precipitation (mm d-1) from five reanalysis data sets, and a station-based analysis (OI-T62, lower right panel) for December-February 1979-2000.
  • Fig. 4. Section across South America displaying schematically the major large-scale elements related to the South American Monsoon System. Source: Climate Variability & Predictability Program (CLIVAR) (http://www.clivar.com/publications/other_pubs/clivar_transp/pdf_files/av_g3_0106.pdf)
  • Fig. 5. Percent of observed mean (1979-2006) annual precipitation for each season.
  • Fig. 6. Mean 200-hPa vector wind/ streamlines and estimated precipitation (mm) (top) and 925-hPa vector wind/ streamlines and estimated precipitation (bottom). The climatology
  • Fig. 7. Height-longitude cross-sections of the mean (1979-2010) divergent circulation (vectors) for the latitude band 10º-20ºS (top panels) and mean (1979-2010) 200-hPa vector wind, streamlines and OLR (bottom panels) for December-February (left panels) and JuneAugust (right panels). Units are 10-6 s-1 for divergence (contours and shading in top panels) and W m-2 for OLR (shading in bottom panels).
  • Fig. 8. Mean (1979-1995) seasonal cycle of OLR and 200-hPa streamlines. Units for OLR are W m-2. Low values of OLR indicate cold cloud tops (deep convection) in the Tropics.

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CITATION STYLE

APA

S. Silva, V. B., & E., V. (2012). The South American Monsoon System: Climatology and Variability. In Modern Climatology. InTech. https://doi.org/10.5772/38565

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