DOI: 10.1175/2011JCLI4189.1
Scopus记录号: 2-s2.0-84856976209
论文题名: Aerial rivers and lakes: Looking at large-scale moisture transport and its relation to Amazonia and to subtropical rainfall in South America
作者: Arraut J.M. ; Nobre C. ; Barbosa H.M.J. ; Obregon G. ; Marengo J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 2 起始页码: 543
结束页码: 556
语种: 英语
Scopus关键词: Amazon region
; Amazonia
; Dry seasons
; Equivalent speed
; Moisture flow
; Moisture transport
; Observational study
; Precipitable water
; River discharge
; Rivers and lakes
; South America
; Trade winds
; Transport
; Vertically integrated moisture transports
; Drought
; Lakes
; Moisture
; Rain
; Rivers
; Tropics
; atmospheric moisture
; evaporation
; moisture transfer
; rainfall
; river discharge
; trade wind
; wind forcing
; Amazonia
; South America
英文摘要: This is an observational study of the large-scale moisture transport over South America, with some analyses on its relation to subtropical rainfall. The concept of aerial rivers is proposed as a framework: it is an analogy between the main pathways of moisture flow in the atmosphere and surface rivers. Opposite to surface rivers, aerial rivers gain (lose) water through evaporation (precipitation). The magnitude of the vertically integrated moisture transport is discharge, and precipitable water is like the mass of the liquid column-multiplied by an equivalent speed it gives discharge. Trade wind flow into Amazonia, and the north/northwesterly flow to the subtropics, east of the Andes, are aerial rivers. Aerial lakes are the sections of a moisture pathway where the flow slows down and broadens, because of diffluence, and becomes deeper, with higher precipitable water. This is the case overAmazonia, downstreamof the trade wind confluence. In the dry season, moisture fromthe aerial lake is transported northeastward, but weaker flow over southern Amazonia heads southward toward the subtropics. SouthernAmazonia appears as a source ofmoisture to this flow. Aerial river discharge to the subtropics is comparable to that of theAmazonRiver. The variations of the amount ofmoisture coming fromAmazonia have an important effect over the variability of discharge. Correlations between the flow from Amazonia and subtropical rainfall are not strong. However, some months within the set of dry seasons observed showed a strong increase (decrease) occurring together with an important increase (decrease) in subtropical rainfall. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52580
Appears in Collections: 气候变化事实与影响
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作者单位: Instituto Nacional de Pesquisas Espaciais, São Paulo, Brazil; Universidade de São Paulo, São Paulo, Brazil
Recommended Citation:
Arraut J.M.,Nobre C.,Barbosa H.M.J.,et al. Aerial rivers and lakes: Looking at large-scale moisture transport and its relation to Amazonia and to subtropical rainfall in South America[J]. Journal of Climate,2012-01-01,25(2)