DOI: 10.1002/joc.5294
论文题名: Climatic and synoptic characterization of heat waves in Brazil
作者: Geirinhas J.L. ; Trigo R.M. ; Libonati R. ; Coelho C.A.S. ; Palmeira A.C.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 4 起始页码: 1760
结束页码: 1776
语种: 英语
英文关键词: atmospheric circulation patterns
; Brazil
; heat waves
Scopus关键词: Climate models
; Coastal zones
; Meteorology
; Soil moisture
; Atmospheric circulation patterns
; Brazil
; Geopotential height anomalies
; Heat waves
; Intertropical convergence zone
; Probability of occurrence
; Regional circulation models
; South atlantic convergence zones
; Climatology
; atmospheric circulation
; climatology
; heat wave
; synoptic meteorology
; trend analysis
; Amazonas [Brazil]
; Brazil
; Manaus
; Pernambuco
; Recife
; Sao Paulo [Brazil]
; Sao Paulo [Sao Paulo (STT)]
英文摘要: According to the latest global and regional circulation models, the probability of occurrence of large heat waves (HWs), such as the 2003 European or the 2010 Russian events will increase significantly in the following decades under most climate scenarios. Currently, there are numerous studies for the Northern Hemisphere characterizing HWs and evaluating their impacts in several areas such as public health, economy, and agriculture. However, over South America, and in particular for Brazil, similar analysis is lacking despite its large geographical extension and numerous population potentially affected. Here we perform an assessment of HW events and characteristics recorded in six large Brazilian cities during the last five decades. The performed analysis reveals the existence of positive and significant trends in HW frequency since the 1980s, particularly for the cities of São Paulo, Manaus, and Recife. Over the last decades, Brasília was the city that recorded the highest number of days per year under a HW regime, contrasting with Rio de Janeiro that recorded the lowest value. The assessment of the large-scale atmospheric circulation patterns associated with summer HWs, indicated for Porto Alegre, São Paulo, Rio de Janeiro, and Brasília the presence of well-marked concentric and positive 500 hPa geopotential height anomalies followed by positive 850 hPa temperature anomalies. These anomalies are likely associated with quasi-stationary anticyclonic systems promoted by anomalous westward displacements of the South Atlantic Subtropical High System which are related to a weakening of other transients (and non-transient) systems such the Intertropical Convergence Zone (ITCZ) and the South Atlantic Convergence Zone. For Manaus, the identified anomalies are linked to a northward displacement of the ITCZ. This configuration is compatible with an increase in solar radiative pattern and decreased soil moisture, enhancing surface temperature values, possibly associated with positive feedback mechanisms between soil and the atmosphere. © 2017 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117069
Appears in Collections: 气候减缓与适应
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作者单位: Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Portugal; Departamento de Meteorologia, Instituto de Geociências, Universidade Federal do Rio de Janeiro, Brazil; Centro de Previsão de Tempo e Estudos Climáticos (CPTEC), Instituto Nacional de Pesquisas Espaciais (INPE), Cachoeira Paulista, São Paulo, Brazil
Recommended Citation:
Geirinhas J.L.,Trigo R.M.,Libonati R.,et al. Climatic and synoptic characterization of heat waves in Brazil[J]. International Journal of Climatology,2018-01-01,38(4)