DOI: 10.1007/s00382-014-2447-3
Scopus记录号: 2-s2.0-84943815550
论文题名: Trend and teleconnection patterns in the climatology of extratropical cyclones over the Southern Hemisphere
作者: Reboita M.S. ; da Rocha R.P. ; Ambrizzi T. ; Gouveia C.D.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-07-08 起始页码: 1929
结束页码: 1944
语种: 英语
英文关键词: ENSO
; Extratropical cyclones
; IOD
; SAM
; Southern Hemisphere
; Teleconnection patterns
; Trend
英文摘要: This study investigated the annual and seasonal trend of the extratropical cyclones occurrence, from 1980 to 2012, considering the whole Southern Hemisphere (SH). The influence of El Niño-Southern Oscillation (ENSO), Southern Annular Mode (SAM) and Indian Ocean Dipole (IOD) in the cyclones track density during the austral spring was also evaluated. Mean sea level pressure from National Centers for Environmental Prediction–National Center for Atmospheric Research reanalysis was used in an automatic scheme for cyclones tracking. The influence of the teleconnection patterns in the cyclones location is assessed through two methodologies: composite analysis and partial correlation technique. For whole SH and considering the total of cyclones and the stronger ones (with central pressure lower than 980 hPa in some period of their lifecycle) there is a statistically significant positive trend, while for weak cyclones the negative trend is not statistically significant. These patterns of trend occur along the year except in the spring. Regionally, the trend signal (positive or negative) of the cyclones occurrence varies spatially in each austral ocean. We suggested that the positive trend of the cyclones in high latitudes of the South Atlantic and South Pacific Oceans would be associated with the last decades global warming. The number of cyclones in the different phases of the ENSO, SAM and IOD is similar to that of neutral periods. However, these teleconnection patterns are important to modify the preferential regions of cyclones occurrence. The composite analysis of the cyclones track density during ENSO and SAM events is similar to that obtained in the partial correlation; but it is not true for IOD. Isolating ENSO and SAM effects in the cyclones track density, it is observed that the IOD positive phase contributes to the decrease in the cyclones density in large part of SH, particularly over the Indian and western South Pacific Oceans. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico
; CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico
; CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53995
Appears in Collections: 过去全球变化的重建
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作者单位: Instituto de Recursos Naturais, Universidade Federal de Itajubá, UNIFEI, Av. BPS, 1303, Itajubá, Brazil; Departamento de Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226, São Paulo, Brazil
Recommended Citation:
Reboita M.S.,da Rocha R.P.,Ambrizzi T.,et al. Trend and teleconnection patterns in the climatology of extratropical cyclones over the Southern Hemisphere[J]. Climate Dynamics,2015-01-01,45(2017-07-08)