globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-012-1639-y
Scopus记录号: 2-s2.0-84884699653
论文题名:
Revisiting wintertime cold air intrusions at the east of the Andes: Propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns
作者: Espinoza J.C.; Ronchail J.; Lengaigne M.; Quispe N.; Silva Y.; Bettolli M.L.; Avalos G.; Llacza A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期:2017-07-08
起始页码: 1983
结束页码: 2002
语种: 英语
英文关键词: Argentina ; Bolivian Amazon ; Circulation patterns ; Cold surges ; Low-level winds ; Peruvian Amazon ; Self-organizing maps
英文摘要: This study investigates the spatial and temporal characteristics of cold surges that propagates northward along the eastern flank of the Andes from subtropical to tropical South America analysing wintertime in situ daily minimum temperature observations from Argentina, Bolivia and Peru and ERA-40 reanalysis over the 1975-2001 period. Cold surges usually last 2 or 3 days but are generally less persistent in the southern La Plata basin compared to tropical regions. On average, three to four cold surges are reported each year. Our analysis reveals that 52 % of cold episodes registered in the south of La Plata basin propagate northward to the northern Peruvian Amazon at a speed of around 20 m s-1. In comparison to cold surges that do not reach the tropical region, we demonstrate that these cold surges are characterized, before they reach the tropical region, by a higher occurrence of a specific circulation pattern associated to southern low-level winds progression toward low latitudes combined with subsidence and dry condition in the middle and low troposphere that reinforce the cold episode through a radiative effect. Finally, the relationship between cold surges and atmosphere dynamics is illustrated for the two most severe cold intrusions that reached the Peruvian and Bolivian Amazon in the last 20 years. © 2012 Springer-Verlag Berlin Heidelberg.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54757
Appears in Collections:过去全球变化的重建

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作者单位: Instituto Geofísico del Perú (IGP), Calle Badajoz 169 Mayorazgo, Ate., Lima 03, Peru; Sorbonne Paris Cité and Laboratoire d'Océanographie, Climat: Expérimentation et Approches Numériques (LOCEAN), Univ Paris Diderot, Paris, France; Institut de Recherche pour le Développement (IRD) and LOCEAN, Paris, France; Servicio Nacional de Meteorología e Hidrología (SENAMHI), Lima, Peru; Departamento de Ciencias de la Atmósfera y los Océanos (FCEN), Universidad de Buenos Aires, Buenos Aires, Argentina

Recommended Citation:
Espinoza J.C.,Ronchail J.,Lengaigne M.,et al. Revisiting wintertime cold air intrusions at the east of the Andes: Propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns[J]. Climate Dynamics,2013-01-01,41(2017-07-08)
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