Spatiotemporal structures of rainfall over the Amazon basin derived from TRMM data

HIERRO RODRIGO; LLAMEDO PABLO; DE LA TORRE ALEJANDRO; ALEXANDER PEDRO

INTERNATIONAL JOURNAL OF CLIMATOLOGY

JOHN WILEY & SONS LTD

Lugar: LOndres; Año: 2016

0899-8418

On the basis of Tropical Rainfall Measuring Mission (TRMM) daily accumulated rainfall data (3B42 v7product) covering 16 years (1998?2013), the Amazon Basin (AB) time and space rainfall variability is analysed. Differentbehaviours of precipitation over AB are found to the north and south of 8∘S when the longitudinal band 70∘?50∘W isconsidered. The sample is then split into northern and southern sectors with respect to 8∘S, describing their monthly evolutionas a function of longitude. The main spatial oscillation modes are isolated and analysed through continuous wavelet transformanalysis. Intense spatial oscillations are found close to the western side of the studied region. Several temporal modes indifferent scales are detected within each sample. Two of them showscales longer than 12months,which are probably associatedwith ENSO phases. Smaller scale oscillations, evaluated from daily data, are also found. The northern sector of AB showsmore daily data variability than the southern one and seems to be more affected by large temporal processes than the southernsector.