Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-22
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
15 Feb 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Meteorological context of the onset and end of the rainy season in Central Amazonia during the 2014–15 Go-Amazon Experiment
Jose A. Marengo1, Gilberto F. Fisch2, Lincoln M. Alves3, Natanael V. Sousa3, Rong Fu4, and Yizhou Zhuang4,5 1Centro Nacional de Monitoramento e Alerta de Desastres Naturais (CEMADEN), São Jose dos Campos, São Paulo, Brazil
2Instituto de Aeronáutica e Espaço/Centro Tecnológico Aeroespacial (IAE/CTA), São Jose dos Campos, São Paulo, Brazil
3Centro de Ciência do Sistema Terrestre/In stituto Nacional de Pesquisas Espaciais (CCST INPE), São Jose dos Campos, São Paulo, Brazil
4Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA
5Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China
Abstract. The onset and demise of the rainy season in Amazonia are assessed in this study using meteorological data from the Go Amazon experiment, with focus is on the 2014–15 rainy season. In addition, global reanalyses are also used to identify changes in circulation leading to the establishment of the rainy season in the region. Our results show that the onset occurred in January 2015, 2–3 pentads later than normal, and the rainy season during austral summer of 2015 exhibited several periods with consecutive dry days in both Manacapuru and Manaus, which are not common for the wet season, and thus determining below normal precipitation. The onset of the rainy season has been strongly associated with changes in large-scale weather conditions in the region due to the effect of the MJO. Regional thermodynamic indices (CAPE, CIN) and the height of the PBL did not present a significant difference between the onset and demise of wet season 2015. This suggests that local changes such the regional thermodynamic characteristics may have not influenced the onset of the rainy season. Variability of the large-scale circulation was responsible for regional convection and rainfall changes in Amazonia during the austral summer of 2014–15.

Citation: Marengo, J. A., Fisch, G. F., Alves, L. M., Sousa, N. V., Fu, R., and Zhuang, Y.: Meteorological context of the onset and end of the rainy season in Central Amazonia during the 2014–15 Go-Amazon Experiment, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-22, in review, 2017.
Jose A. Marengo et al.
Jose A. Marengo et al.
Jose A. Marengo et al.

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