Rainfall Patterns in the Southern Amazon: a chronological perspective (1970-2010).
Nathan Debortoli
(1)
,
Vincent Dubreuil
(1, 2, 3)
,
Beatriz M. Funatsu
(1, 4)
,
Florian Delahaye
(1)
,
Carlos Henke de Oliveira
,
Saulo Rodrigues Filho
(5)
,
C. Saito
,
R. Fetter
Nathan Debortoli
- Fonction : Auteur
- PersonId : 860186
Vincent Dubreuil
- Fonction : Auteur
- PersonId : 4905
- IdHAL : vincent-dubreuil
- ORCID : 0000-0001-8383-805X
- IdRef : 057532974
Beatriz M. Funatsu
- Fonction : Auteur
- PersonId : 5635
- IdHAL : beatriz-m-funatsu
- ORCID : 0000-0003-0448-1924
- IdRef : 223449210
Carlos Henke de Oliveira
- Fonction : Auteur
C. Saito
- Fonction : Auteur
R. Fetter
- Fonction : Auteur
Résumé
The aim of this study is to characterize rainfall patterns in a vast transition zone
between the Amazon and the Cerrado Biomes. The analysis is focused on annual and seasonal
tendencies, mainly about the onset and offset of the rainy season, its length and shifts. More
than 200 Rain Gauges (RGs) were analyzed in the study area using Pettitt’s and Mann-
Kendall’s non-parametric tests allied to a Linear Regression Analysis over the period 1971–
2010. The onset and offset dates of the rainy season and its duration are also identified for 89
RGs. Pettitt’s test indicates ruptures in 16 % of the rainfall time series while Mann-Kendall’s
monthly test indicates that 45%of the RGs had negative trends, mainly in the transition seasons
(spring and austral autumn). Linear Regression Analysis indicates negative trends in 63 % of
the time series concomitant to the rainy season onset and offset analysis, which confirmes a
delay for the onset of the rainy season in 76 % of the RGs and a premature demise for 84 % of
theRGs. Identification of the tendencies for rainy season duration indicates that the rainy season
has become shorter at 88 % of the RGs. There were recurring patterns in the results displaying
drier conditions in RGs localized in deforested areas opposed to forested locations.
Domaines
GéographieFormat du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Rainfall Patterns in the Southern Amazon: a chronological perspective (1970-2010).
|
Résumé |
en
The aim of this study is to characterize rainfall patterns in a vast transition zone
between the Amazon and the Cerrado Biomes. The analysis is focused on annual and seasonal
tendencies, mainly about the onset and offset of the rainy season, its length and shifts. More
than 200 Rain Gauges (RGs) were analyzed in the study area using Pettitt’s and Mann-
Kendall’s non-parametric tests allied to a Linear Regression Analysis over the period 1971–
2010. The onset and offset dates of the rainy season and its duration are also identified for 89
RGs. Pettitt’s test indicates ruptures in 16 % of the rainfall time series while Mann-Kendall’s
monthly test indicates that 45%of the RGs had negative trends, mainly in the transition seasons
(spring and austral autumn). Linear Regression Analysis indicates negative trends in 63 % of
the time series concomitant to the rainy season onset and offset analysis, which confirmes a
delay for the onset of the rainy season in 76 % of the RGs and a premature demise for 84 % of
theRGs. Identification of the tendencies for rainy season duration indicates that the rainy season
has become shorter at 88 % of the RGs. There were recurring patterns in the results displaying
drier conditions in RGs localized in deforested areas opposed to forested locations.
|
Auteur(s) |
Nathan Debortoli
1
, Vincent Dubreuil
1, 2, 3
, Beatriz M. Funatsu
1, 4
, Florian Delahaye
1
, Carlos Henke de Oliveira
, Saulo Rodrigues Filho
5
, C. Saito
, R. Fetter
1
LETG - Rennes -
Littoral, Environnement, Télédétection, Géomatique
( 3177 )
- Maison de la Recherche Place du Recteur Henri Le Moal 35043 RENNES CEDEX
- France
2
UR2 UFRSS -
Université de Rennes 2 - UFR Sciences sociales
( 107256 )
- Campus Villejean - Place du recteur Henri Le Moal - CS 24307 - 35043 Rennes cedex
- France
3
CAREN -
Centre Armoricain de Recherche en Environnement
( 1912 )
- Bât. 14B Campus de Beaulieu 35042 RENNES CEDEX
- France
4
LMD -
Laboratoire de Météorologie Dynamique (UMR 8539)
( 143 )
- LMD ENS 24 Rue Lhomond 75231 Paris Cedex 05
- France
5
CDS -
Centro de Desenvolvimento Sustentavel
( 93030 )
- France
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2015-05-05
|
Volume |
132
|
Numéro |
2
|
Page/Identifiant |
251-269
|
Langue du document |
Anglais
|
Nom de la revue |
|
Projet(s) ANR |
|
Domaine(s) |
|
Mots-clés |
en
Rainfall, Amazonia, trends, Mann-Kendall
|
DOI | 10.1007/s10584-015-1415-1 |
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