A divergência do campo do fluxo de vapor d'água e as chuvas na região Amazônica

Marques, José Augusto Veiga da Costa; Salati, Enéas; Santos, Jesus Marden dos

doi:10.1590/1809-43921980101133

Cited by 11 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Rainfall decreases towards the Tropics reaching more than 2000 mm/year in the southeast of Brazil and less than 1500 mm/year in the Peruvian-Bolivian plain and in the Roraima Brazilian state which is protected from the Atlantic humid flows by the Guyanese shield. This distribution is consistent with the results of Ratisbona (1976), Salati et al (1978), Marquez et al (1980), Figueroa and Nobre (1990), Fisch et al (1998), andMarengo (2004), among others. However, our rainfall map yields more information about the Andean countries.…”

Section: Spatial Variability Of Annual Rainfallsupporting

confidence: 92%

“…Abundant rainfall is also registered near the Amazon River delta where the sea-breeze effect is important (Salati et al, 1978). Salati et al (1978) calculated a mean of 2400 mm/year in the central region of the AB and Marquez et al (1980) and Fisch et al (1998) a mean 2300 mm rainfall for the Brazilian AB. Different studies, for the whole AB, give values from 2000 to 3664 mm, with the greater part between 2000 and 2200 mm, as found by Marengo and Nobre (2001).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spatio‐temporal rainfall variability in the Amazon basin countries (Brazil, Peru, Bolivia, Colombia, and Ecuador)

Espinoza

Ronchail

Guyot

et al. 2008

Intl Journal of Climatology

446

265

View full text Add to dashboard Cite

Rainfall variability in the Amazon basin (AB) is analysed for the 1964-2003 period. It is based on 756 pluviometric stations distributed throughout the AB countries. For the first time it includes data from Bolivia, Peru, Ecuador, and Colombia. In particular, the recent availability of rainfall data from the Andean countries makes it possible to complete previous studies. The impact of mountain ranges on rainfall is pointed out. The highest rainfall in the AB is observed in low windward regions, and low rainfall is measured in leeward and elevated stations. Additionally, rainfall regimes are more diversified in the Andean regions than in the lowlands. Rainfall spatio-temporal variability is studied based on a varimax-rotated principal component analysis (PCA). Long-term variability with a decreasing rainfall since the 1980s prevails in June-July-August (JJA) and September-October-November (SON). During the rainiest seasons, i.e. December-January-February (DJF) and March-April-May (MAM), the main variability is at decadal and interannual time scales. Interdecadal variability is related to long-term changes in the Pacific Ocean, whereas decadal variability, opposing the northwest and the south of the AB, is associated with changes in the strength of the low-level jet (LLJ) along the Andes. Interannual variability characterizes more specifically the northeast of the basin and the southern tropical Andes. It is related to El Niño-Southern Oscillation (ENSO) and to the sea surface temperature (SST) gradient over the tropical Atlantic. Mean rainfall in the basin decreases during the 1975-2003 period at an annual rate estimated to be −0.32%. Break tests show that this decrease has been particularly important since 1982. Further insights into this phenomenon will permit to identify the impact of climate on the hydrology of the AB.

show abstract

Section: Spatial Variability Of Annual Rainfallsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Spatio‐temporal rainfall variability in the Amazon basin countries (Brazil, Peru, Bolivia, Colombia, and Ecuador)

Espinoza

Ronchail

Guyot

et al. 2008

Intl Journal of Climatology

446

265

View full text Add to dashboard Cite

show abstract

“…Several studies investigating the long‐term water balance of the Amazon River basin have focused on understanding the surface branch (Costa & Foley, ; Franken & Leopoldo, ; Jordan & Heuveldop, ; Leopoldo et al, ; Marengo, ; Marques et al, ; Russell & Miller, ; Shuttleworth, ; Villa Nova et al, ; Vörösmarty et al, ; Zeng, ). In general, these studies have addressed water balance at the Óbidos gauging station, with some reporting an exact (see supporting information Table S) closure accounting for a perfect surface balance in the basin.…”

Section: Introductionmentioning

confidence: 99%

Conjoint Analysis of Surface and Atmospheric Water Balances in the Andes‐Amazon System

Builes‐Jaramillo

Poveda

2018

Water Resources Research

View full text Add to dashboard Cite

Surface and atmospheric water balances analysis for Amazon River basin at monthly time scale are performed with an emphasis on the linkages between the Andes and low-lying Amazonia. Analyses are performed using observational and reanalysis data covering five different periods of analysis (depending on length of evapotranspiration data sets) for the entire basin, major subcatchments, and for the Andes and low-lying Amazonia. Results for the entire basin show a state close to balance within tolerance, while the spatial disaggregation produced a less clear picture, presenting major discrepancies between observations and reanalysis data sets. The atmospheric budget exhibits no closure and positive residuals regardless of data set, with the magnitude of residuals for the entire Amazon basin highly dependent on evapotranspiration data source. The imbalance between the two water budgets (14%-16%) is driven by higher values of runoff and by an abrupt change in runoff when changing from dry to wet seasons in the Amazon. We unveil two shortcomings of the available data, namely poor quality in the representation of surface processes by reanalysis, and flaws and scarcity of information in the high Andes that induce uncertainties and errors in both water budgets. The results of the present study highlight the importance of the Andean region for the hydrological integrity of the entire Amazon River basin. Our results confirm the paramount importance of the joint analysis of atmospheric and surface water budgets at the basin level with respect to achieving a complete understanding of the whole hydrological cycle at the continental scale.

show abstract

“…Marques (1998) e Marques et al (1980) mostraram que a maior parte do vapor d`água existente na Amazónia, provêm do Oceano Atlântico, carreada pelos ventos de leste na baixa troposfera. Buchmann et al (1990Buchmann et al ( e 1995 mostraram também influências das águas do Atlântico Norte sobre a Amazónia.…”

Section: Introductionunclassified

Influências remotas sobre a Amazônia e dela sobre outras regiões: o homem, a flora e a fauna

Buchmann

1999

Anu. Inst. Geoc.

View full text Add to dashboard Cite

A divergência do campo do fluxo de vapor d'água e as chuvas na região Amazônica

Cited by 11 publications

References 1 publication

Spatio‐temporal rainfall variability in the Amazon basin countries (Brazil, Peru, Bolivia, Colombia, and Ecuador)

Spatio‐temporal rainfall variability in the Amazon basin countries (Brazil, Peru, Bolivia, Colombia, and Ecuador)

Conjoint Analysis of Surface and Atmospheric Water Balances in the Andes‐Amazon System

Influências remotas sobre a Amazônia e dela sobre outras regiões: o homem, a flora e a fauna

Contact Info

Product

Resources

About