INFLUENCES ON ATMOSPHERIC BLOCKING REGIMES ON SOUTHERN BRAZIL ON SCENARIOS OF FUTURE CLIMATE CHANGE

Authors

  • Diego Pedroso Departamento de Estatística, UFSM
  • Simone Erotildes Teleginski Ferraz Departamento de Estatística, UFSM
  • Ernani de Lima Nascimento Departamento de Estatística, UFSM
  • Tércio Ambrizzi Instituto Astronômico, Geofísico e de Ciências Atmosféricas, USP
  • Rosmeri Porfírio da Rocha Instituto Astronômico, Geofísico e de Ciências Atmosféricas, USP

DOI:

https://doi.org/10.5902/2179460X16220

Keywords:

Bloqueios atmosféricos, clima futuro.

Abstract

http://dx.doi.org/10.5902/2179460X16220

Blockings are atmospheric phenomena occurring especially in midlatitudes with duration ranging from a few days, reaching remain active for weeks. During the occurrence of an atmospheric blocking, a persistent high pressure anomaly, located south of the belt of semi-permanent subtropical high, preventing the advance systems in their normal course arises. To detect these events proposed by Pelly e Hoskins (2003) - (PH03) index was used. This index detect the reversal meridional gradient of potential temperature on the dynamic tropopause (high levels) caused by persistent abnormal movement. The situation must remain active for more than three consecutive days and be present in greater than 10° of longitude area. The index is calculated for the period from 1986 winter, moreover, analysis of meteorological fields that characterize its synoptic conditions is made. The blockade remained active in the region for several days between the end of July and early August. The results were satisfactory so that the field of meteorological analysis showed the property of blocking condition showing the functionality of the PH03 index.

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Published

2015-03-07

How to Cite

Pedroso, D., Ferraz, S. E. T., Nascimento, E. de L., Ambrizzi, T., & Rocha, R. P. da. (2015). INFLUENCES ON ATMOSPHERIC BLOCKING REGIMES ON SOUTHERN BRAZIL ON SCENARIOS OF FUTURE CLIMATE CHANGE. Ciência E Natura, 37, 83–90. https://doi.org/10.5902/2179460X16220

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